Hello, syzbot found the following issue on: HEAD commit: ffabf7c73176 Merge tag 'ata-6.5-rc4' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1222dfcea80000 kernel config: https://syzkaller.appspot.com/x/.config?x=5d10d93e1ae1f229 dashboard link: https://syzkaller.appspot.com/bug?extid=d9d40a56a26bdd36922e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1209bae5a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122ba496a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/206c7acdd0bc/disk-ffabf7c7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8fddac9d8e42/vmlinux-ffabf7c7.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b13871eaad4/bzImage-ffabf7c7.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/8053495721fb/mount_0.gz Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10353bf6a80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=12353bf6a80000 console output: https://syzkaller.appspot.com/x/log.txt?x=14353bf6a80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d9d40a56a26bdd36922e@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task kworker/u4:2:30 blocked for more than 143 seconds. Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:2 state:D stack:20560 pid:30 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-btrfs-47) Call Trace: <TASK> context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 io_schedule+0x8c/0x100 kernel/sched/core.c:9028 folio_wait_bit_common+0x86c/0x12b0 mm/filemap.c:1304 folio_lock include/linux/pagemap.h:959 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2140 [inline] extent_writepages+0xcea/0x2d00 fs/btrfs/extent_io.c:2286 do_writepages+0x3a6/0x670 mm/page-writeback.c:2553 __writeback_single_inode+0x155/0xfa0 fs/fs-writeback.c:1603 writeback_sb_inodes+0x8e3/0x11d0 fs/fs-writeback.c:1894 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:1965 wb_writeback+0x461/0xc60 fs/fs-writeback.c:2072 wb_check_background_flush fs/fs-writeback.c:2142 [inline] wb_do_writeback fs/fs-writeback.c:2230 [inline] wb_workfn+0xc6f/0xff0 fs/fs-writeback.c:2257 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> INFO: task kworker/u4:5:1145 blocked for more than 144 seconds. Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack:21608 pid:1145 ppid:2 flags:0x00004000 Workqueue: btrfs-endio-write btrfs_work_helper Call Trace: <TASK> context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 wait_on_state fs/btrfs/extent-io-tree.c:719 [inline] wait_extent_bit+0x50c/0x670 fs/btrfs/extent-io-tree.c:763 lock_extent+0x1c0/0x270 fs/btrfs/extent-io-tree.c:1755 btrfs_finish_one_ordered+0x5bf/0x1c80 fs/btrfs/inode.c:3242 btrfs_work_helper+0x380/0xbe0 fs/btrfs/async-thread.c:314 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> INFO: task syz-executor376:6242 blocked for more than 144 seconds. Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor376 state:D stack:23592 pid:6242 ppid:5052 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 wait_on_state fs/btrfs/extent-io-tree.c:719 [inline] wait_extent_bit+0x50c/0x670 fs/btrfs/extent-io-tree.c:763 lock_extent+0x1c0/0x270 fs/btrfs/extent-io-tree.c:1755 find_lock_delalloc_range+0x4b5/0x980 fs/btrfs/extent_io.c:443 writepage_delalloc+0x1bd/0x490 fs/btrfs/extent_io.c:1235 __extent_writepage fs/btrfs/extent_io.c:1492 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2160 [inline] extent_writepages+0x14bd/0x2d00 fs/btrfs/extent_io.c:2286 do_writepages+0x3a6/0x670 mm/page-writeback.c:2553 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:393 __filemap_fdatawrite_range mm/filemap.c:426 [inline] filemap_fdatawrite_range+0x16e/0x1e0 mm/filemap.c:444 btrfs_fdatawrite_range fs/btrfs/file.c:3850 [inline] start_ordered_ops fs/btrfs/file.c:1725 [inline] btrfs_sync_file+0x424/0x1330 fs/btrfs/file.c:1800 generic_write_sync include/linux/fs.h:2493 [inline] btrfs_do_write_iter+0xb45/0x1020 fs/btrfs/file.c:1677 call_write_iter include/linux/fs.h:1871 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x782/0xaf0 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0fa348afc9 RSP: 002b:00007f0fa3447218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f0fa35176c8 RCX: 00007f0fa348afc9 RDX: 0000000000000128 RSI: 0000000020004400 RDI: 0000000000000006 RBP: 00007f0fa35176c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0fa34e41b0 R13: 61635f65646f6e69 R14: 65646f7475616f6e R15: 7261637369646f6e </TASK> INFO: task syz-executor376:6283 blocked for more than 145 seconds. Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor376 state:D stack:21704 pid:6283 ppid:5052 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 wait_on_state fs/btrfs/extent-io-tree.c:719 [inline] wait_extent_bit+0x50c/0x670 fs/btrfs/extent-io-tree.c:763 lock_extent+0x1c0/0x270 fs/btrfs/extent-io-tree.c:1755 btrfs_page_mkwrite+0x5bd/0xd10 fs/btrfs/inode.c:8271 do_page_mkwrite+0x1a4/0x600 mm/memory.c:2942 wp_page_shared mm/memory.c:3294 [inline] do_wp_page+0x559/0x3a70 mm/memory.c:3376 handle_pte_fault mm/memory.c:4955 [inline] __handle_mm_fault mm/memory.c:5079 [inline] handle_mm_fault+0x1c58/0x5410 mm/memory.c:5233 do_user_addr_fault arch/x86/mm/fault.c:1392 [inline] handle_page_fault arch/x86/mm/fault.c:1486 [inline] exc_page_fault+0x266/0x7c0 arch/x86/mm/fault.c:1542 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:rep_movs_alternative+0x33/0xb0 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0000:ffffc9000b76f330 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000020000158 RCX: 0000000000000038 RDX: 0000000000000000 RSI: ffffc9000b76f3e0 RDI: 0000000020000120 RBP: ffffc9000b76f498 R08: ffffc9000b76f417 R09: 1ffff920016ede82 R10: dffffc0000000000 R11: fffff520016ede83 R12: 0000000000000038 R13: ffffc9000b76f3e0 R14: 0000000020000120 R15: ffffc9000b76f3e0 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user+0x86/0xa0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:144 emit_fiemap_extent+0x256/0x410 fs/btrfs/extent_io.c:2532 fiemap_process_hole+0x374/0xaf0 fs/btrfs/extent_io.c:2743 extent_fiemap+0xeae/0x1fe0 btrfs_fiemap+0x178/0x1e0 fs/btrfs/inode.c:7943 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x19db/0x2b30 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0fa348afc9 RSP: 002b:00007f0f9c026218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0fa35176d8 RCX: 00007f0fa348afc9 RDX: 0000000020000100 RSI: 00000000c020660b RDI: 0000000000000005 RBP: 00007f0fa35176d0 R08: 00007ffc74220257 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0fa34e41b0 R13: 61635f65646f6e69 R14: 65646f7475616f6e R15: 7261637369646f6e </TASK> Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8d328db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffffffff8d329170 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff8d328be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/u4:2/30: #0: ffff88814267e938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7e3/0x12c0 kernel/workqueue.c:2569 #1: ffffc90000a6fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x82b/0x12c0 kernel/workqueue.c:2571 #2: ffff88807a5d00e0 (&type->s_umount_key#43){++++}-{3:3}, at: trylock_super+0x1f/0xf0 fs/super.c:413 3 locks held by kworker/u4:5/1145: #0: ffff8880285ae138 ((wq_completion)btrfs-endio-write){+.+.}-{0:0}, at: process_one_work+0x7e3/0x12c0 kernel/workqueue.c:2569 #1: ffffc9000514fd00 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work+0x82b/0x12c0 kernel/workqueue.c:2571 #2: ffff888023a0a488 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x343/0x1c80 fs/btrfs/inode.c:3201 2 locks held by getty/4768: #0: ffff88802df81098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187 2 locks held by syz-executor376/6242: #0: ffff8880201da0c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x20f/0x2a0 fs/file.c:1046 #1: ffff88807a5d0410 (sb_writers#9){.+.+}-{0:0}, at: vfs_write+0x216/0xaf0 fs/read_write.c:580 4 locks held by syz-executor376/6283: #0: ffff8880753d62b0 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:781 [inline] #0: ffff8880753d62b0 (&sb->s_type->i_mutex_key#14){++++}-{3:3}, at: btrfs_inode_lock+0x60/0xd0 fs/btrfs/inode.c:369 #1: ffff88807d6027a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:167 [inline] #1: ffff88807d6027a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5261 [inline] #1: ffff88807d6027a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5323 #2: ffff88807a5d0508 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x1a4/0x600 mm/memory.c:2942 #3: ffff8880753d6138 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x49c/0xd10 fs/btrfs/inode.c:8260 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5903 Comm: kworker/u4:0 Not tainted 6.5.0-rc3-syzkaller-00275-gffabf7c73176 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:127 [inline] RIP: 0010:smp_call_function_many_cond+0x1660/0x27d0 kernel/smp.c:827 Code: 85 f6 75 07 e8 31 16 0b 00 eb 0a e8 2a 16 0b 00 e8 75 d5 11 00 4c 89 fb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df 80 3c 03 00 <74> 08 4c 89 ff e8 36 df 63 00 48 c7 84 24 60 01 00 00 00 00 00 00 RSP: 0018:ffffc9000ad9f780 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff920015b3f1c RCX: ffffffff816c3cea RDX: dffffc0000000000 RSI: ffffffff8b0a90c0 RDI: ffffffff8b58a600 RBP: ffffc9000ad9f980 R08: ffffffff907b1307 R09: 1ffffffff20f6260 R10: dffffc0000000000 R11: fffffbfff20f6261 R12: ffff8880b993d0c0 R13: 0000000000000000 R14: 0000000000000200 R15: ffffc9000ad9f8e0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0f9bf29000 CR3: 000000000d130000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1003 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2001 [inline] text_poke_bp_batch+0x615/0x960 arch/x86/kernel/alternative.c:2273 text_poke_flush arch/x86/kernel/alternative.c:2402 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2409 arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x132/0x250 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:831 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.240 msecs --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
