Hello, syzbot found the following issue on: HEAD commit: 62d8779610bb Merge tag 'ext4_for_linus_stable' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1623de37280000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac246111fb601aec dashboard link: https://syzkaller.appspot.com/bug?extid=38d04642cea49f3a3d2e compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f2ffbf05c9a8/disk-62d87796.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4809ae14c9e7/vmlinux-62d87796.xz kernel image: https://storage.googleapis.com/syzbot-assets/9cd8b18ed845/bzImage-62d87796.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+38d04642cea49f3a3d2e@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor.2:687 blocked for more than 143 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23232 pid:687 ppid:24312 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fd6b008c391 RSP: 002b:0000000020000160 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fd6b01abf80 RCX: 00007fd6b008c389 RDX: 0000000020000180 RSI: 0000000020000160 RDI: 0000000002000000 RBP: 00007fd6b00d7493 R08: 0000000020000200 R09: 0000000020000200 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffddfff939f R14: 00007fd6b0dfd300 R15: 0000000000022000 </TASK> INFO: task syz-executor.4:740 blocked for more than 143 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23248 pid:740 ppid:542 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fbf7328c391 RSP: 002b:0000000020000160 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fbf733ac050 RCX: 00007fbf7328c389 RDX: 0000000020000180 RSI: 0000000020000160 RDI: 0000000002000000 RBP: 00007fbf732d7493 R08: 0000000020000200 R09: 0000000020000200 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffc83f3088f R14: 00007fbf74061300 R15: 0000000000022000 </TASK> INFO: task syz-executor.4:885 blocked for more than 145 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23824 pid:885 ppid:542 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fbf7328c391 RSP: 002b:0000000020000160 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fbf733abf80 RCX: 00007fbf7328c389 RDX: 0000000020000180 RSI: 0000000020000160 RDI: 0000000002000000 RBP: 00007fbf732d7493 R08: 0000000020000200 R09: 0000000020000200 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffc83f3088f R14: 00007fbf74082300 R15: 0000000000022000 </TASK> INFO: task syz-executor.4:908 blocked for more than 146 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23944 pid:908 ppid:542 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fbf7328c391 RSP: 002b:0000000020000280 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fbf733abf80 RCX: 00007fbf7328c389 RDX: 00000000200002c0 RSI: 0000000020000280 RDI: 0000000000000200 RBP: 00007fbf732d7493 R08: 0000000020000340 R09: 0000000020000340 R10: 0000000020000300 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffc83f3088f R14: 00007fbf74082300 R15: 0000000000022000 </TASK> INFO: task syz-executor.4:936 blocked for more than 147 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23944 pid:936 ppid:542 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fbf7328c391 RSP: 002b:0000000020000160 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fbf733abf80 RCX: 00007fbf7328c389 RDX: 0000000020000180 RSI: 0000000020000160 RDI: 0000000002000000 RBP: 00007fbf732d7493 R08: 0000000020000200 R09: 0000000020000200 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffc83f3088f R14: 00007fbf74082300 R15: 0000000000022000 </TASK> INFO: task syz-executor.2:971 blocked for more than 147 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:22928 pid:971 ppid:24312 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fd6b008c391 RSP: 002b:0000000020000280 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fd6b01abf80 RCX: 00007fd6b008c389 RDX: 00000000200002c0 RSI: 0000000020000280 RDI: 0000000000000200 RBP: 00007fd6b00d7493 R08: 0000000020000340 R09: 0000000020000340 R10: 0000000020000300 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffddfff939f R14: 00007fd6b0dfd300 R15: 0000000000022000 </TASK> INFO: task syz-executor.2:983 blocked for more than 148 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23776 pid:983 ppid:24312 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fd6b008c391 RSP: 002b:0000000020000160 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fd6b01abf80 RCX: 00007fd6b008c389 RDX: 0000000020000180 RSI: 0000000020000160 RDI: 0000000002000000 RBP: 00007fd6b00d7493 R08: 0000000020000200 R09: 0000000020000200 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffddfff939f R14: 00007fd6b0dfd300 R15: 0000000000022000 </TASK> INFO: task syz-executor.2:997 blocked for more than 148 seconds. Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23744 pid:997 ppid:24312 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2644 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2692 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2864 ext4_da_write_begin+0x172/0x8c0 fs/ext4/inode.c:2891 generic_perform_write+0x256/0x570 mm/filemap.c:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fd6b008c391 RSP: 002b:0000000020000280 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fd6b01abf80 RCX: 00007fd6b008c389 RDX: 00000000200002c0 RSI: 0000000020000280 RDI: 0000000000000200 RBP: 00007fd6b00d7493 R08: 0000000020000340 R09: 0000000020000340 R10: 0000000020000300 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffddfff939f R14: 00007fd6b0dfd300 R15: 0000000000022000 </TASK> Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8c7984b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518 1 lock held by rcu_tasks_trace/14: #0: ffffffff8c7981b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518 1 lock held by khungtaskd/28: #0: ffffffff8c7990c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6559 3 locks held by kworker/u4:3/46: #0: ffff888145672138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888145672138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888145672138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline] #0: ffff888145672138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline] #0: ffff888145672138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] #0: ffff888145672138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc90000b77db0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 2 locks held by getty/4753: #0: ffff88802aec0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900015802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2176 3 locks held by syz-executor.2/24312: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x680 fs/namei.c:4374 #1: ffff88803fe02c00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline] #1: ffff88803fe02c00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x280/0x680 fs/namei.c:4378 #2: ffff888083300400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff888083300400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 fs/namei.c:4316 3 locks held by syz-executor.2/687: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082afd400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082afd400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.4/740: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88808724c000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88808724c000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.4/885: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888046cf0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888046cf0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.4/908: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88805471a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88805471a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.4/936: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888050412c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888050412c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.2/971: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880874e5e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880874e5e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.2/983: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88808724b600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88808724b600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 3 locks held by syz-executor.2/997: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082afca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082afca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffff88802c31c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2689 1 lock held by syz-executor.0/5907: #0: ffff8880546eac00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0xd1/0x6f0 fs/readdir.c:55 1 lock held by syz-executor.1/7188: #0: ffff888082aeb600 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0xd1/0x6f0 fs/readdir.c:55 1 lock held by syz-executor.0/7562: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/7739: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/7802: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/7812: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/7827: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/7838: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/7856: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.2/7858: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.5/8636: #0: ffff888082aec000 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0xd1/0x6f0 fs/readdir.c:55 1 lock held by syz-executor.5/8731: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.5/8734: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 2 locks held by syz-executor.5/8877: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880870e4000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880870e4000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/8885: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082f0f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082f0f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/8886: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082f0de00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082f0de00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.2/8888: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082f0a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082f0a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/8889: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082f0e800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082f0e800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/8890: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880870e6800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880870e6800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/8891: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880870e5400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880870e5400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/8907: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082aed400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082aed400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/8911: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803cddb600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803cddb600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.2/8912: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082ae8e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082ae8e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/8918: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880826e9800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880826e9800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/8919: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803cddca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803cddca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/8923: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880826eca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880826eca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/8924: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880826ec000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880826ec000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 3 locks held by syz-executor.2/8938: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 #1: ffff88814be58990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 #2: ffff888078e9f088 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x707/0x18d0 fs/ext4/inode.c:616 2 locks held by syz-executor.1/8942: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888078e9de00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888078e9de00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 1 lock held by syz-executor.4/8955: #0: ffff8880546eb600 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0xd1/0x6f0 fs/readdir.c:55 1 lock held by syz-executor.0/9094: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/9096: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.3/9157: #0: ffff88803444e800 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: iterate_dir+0xd1/0x6f0 fs/readdir.c:55 2 locks held by syz-executor.3/9599: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88802fd5d400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88802fd5d400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9600: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88802fd5ca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88802fd5ca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.2/9619: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803e361800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803e361800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/9625: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888046cf3600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888046cf3600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 1 lock held by syz-executor.1/9626: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 2 locks held by syz-executor.3/9627: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803ce98e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803ce98e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.4/9629: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888046cf7200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888046cf7200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9635: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88805471c000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88805471c000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/9637: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888046cf2c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888046cf2c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/9640: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88805471d400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88805471d400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 1 lock held by syz-executor.2/9785: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/9790: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/9795: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/9796: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/9797: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/9806: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.0/9807: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/9815: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/9819: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.2/9829: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.1/9847: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 1 lock held by syz-executor.2/9852: #0: ffff88802c31eb98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 2 locks held by syz-executor.4/9858: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888087255400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888087255400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.4/9861: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803e364a00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803e364a00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9863: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803e367200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803e367200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9866: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88802fd5ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88802fd5ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/9869: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88802fd5a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88802fd5a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.4/9873: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082afc000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082afc000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/9875: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803450ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803450ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.4/9879: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082af8e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082af8e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/9883: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082b4b600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082b4b600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/9884: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082b4ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082b4ac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9888: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082b48400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082b48400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/9889: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082b4d400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082b4d400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/9891: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082afac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082afac00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9894: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888082b4a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888082b4a200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9899: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880546eca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880546eca00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.4/9905: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880546e8400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880546e8400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/9906: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803fe01800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803fe01800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/9911: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88803fe00400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88803fe00400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.2/9912: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880546e9800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880546e9800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.4/9930: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888033322c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888033322c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.2/9931: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888083300400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888083300400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.3/9937: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888033326800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888033326800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.0/9938: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888033325400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888033325400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.1/9939: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880874e6800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880874e6800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 2 locks held by syz-executor.5/9940: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff8880874e0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff8880874e0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 3 locks held by syz-executor.4/9942: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x680 fs/namei.c:4374 #1: ffff8880546eb600 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline] #1: ffff8880546eb600 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x280/0x680 fs/namei.c:4378 #2: ffff888033322c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff888033322c00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 fs/namei.c:4316 3 locks held by syz-executor.1/9943: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x680 fs/namei.c:4374 #1: ffff888082aeb600 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline] #1: ffff888082aeb600 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x280/0x680 fs/namei.c:4378 #2: ffff8880874e6800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff8880874e6800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 fs/namei.c:4316 3 locks held by syz-executor.3/9945: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x680 fs/namei.c:4374 #1: ffff88803444e800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline] #1: ffff88803444e800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x280/0x680 fs/namei.c:4378 #2: ffff888033326800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff888033326800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 fs/namei.c:4316 3 locks held by syz-executor.0/9948: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x680 fs/namei.c:4374 #1: ffff8880546eac00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline] #1: ffff8880546eac00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x280/0x680 fs/namei.c:4378 #2: ffff888033325400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff888033325400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 fs/namei.c:4316 3 locks held by syz-executor.5/9949: #0: ffff88802c31c460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x680 fs/namei.c:4374 #1: ffff888082aec000 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:810 [inline] #1: ffff888082aec000 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x280/0x680 fs/namei.c:4378 #2: ffff8880874e0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #2: ffff8880874e0400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 fs/namei.c:4316 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xe16/0x1090 kernel/hung_task.c:379 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 68 Comm: kworker/u4:4 Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Workqueue: phy90 ieee80211_iface_work RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3740 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3760 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3815 [inline] RIP: 0010:__lock_acquire+0x19cb/0x5f30 kernel/locking/lockdep.c:5088 Code: 08 49 c1 ec 2f 84 c0 4e 8d 2c e5 60 2c 41 91 0f 84 c2 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 <0f> 85 53 3d 00 00 4a 8b 1c e5 60 2c 41 91 48 85 db 74 63 48 83 eb RSP: 0018:ffffc900020af840 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff81659797 RDX: 1ffffffff228d43e RSI: 0000000000000008 RDI: ffffffff9152ad00 RBP: ffff888019af8000 R08: 0000000000000000 R09: ffffffff9152ad07 R10: fffffbfff22a55a0 R11: 0000000000094001 R12: 000000000000aeb2 R13: ffffffff9146a1f0 R14: 0000000000000000 R15: ffff888019af8b18 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556a55848 CR3: 000000002994d000 CR4: 0000000000350ef0 Call Trace: <NMI> </NMI> <TASK> lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 __debug_check_no_obj_freed lib/debugobjects.c:1011 [inline] debug_check_no_obj_freed+0xcb/0x420 lib/debugobjects.c:1054 slab_free_hook mm/slub.c:1756 [inline] slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3786 [inline] kmem_cache_free+0xe9/0x480 mm/slub.c:3808 skb_kfree_head net/core/skbuff.c:903 [inline] skb_kfree_head net/core/skbuff.c:899 [inline] skb_free_head+0x17f/0x1b0 net/core/skbuff.c:918 skb_release_data+0x598/0x820 net/core/skbuff.c:948 skb_release_all net/core/skbuff.c:1014 [inline] __kfree_skb net/core/skbuff.c:1028 [inline] kfree_skb_reason+0x179/0x3c0 net/core/skbuff.c:1064 kfree_skb include/linux/skbuff.h:1236 [inline] ieee80211_iface_work+0x357/0xd70 net/mac80211/iface.c:1650 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
