Hello, syzbot found the following issue on: HEAD commit: 92901222f83d Merge tag 'f2fs-for-6-6-rc1' of git://git.ker.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=16880848680000 kernel config: https://syzkaller.appspot.com/x/.config?x=3d78b3780d210e21 dashboard link: https://syzkaller.appspot.com/bug?extid=4fcffdd85e518af6f129 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=17933a00680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12ef7104680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f58f2fdc5a9e/disk-92901222.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/16dba3905664/vmlinux-92901222.xz kernel image: https://storage.googleapis.com/syzbot-assets/3a5b1d5efdbd/bzImage-92901222.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/821293a2c99e/mount_0.gz The issue was bisected to: commit 47b7ec1daa511cd82cb9c31e88bfdb664b031d2a Author: Andrew Price <anprice@xxxxxxxxxx> Date: Fri Feb 5 17:10:17 2021 +0000 gfs2: Enable rgrplvb for sb_fs_format 1802 bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16c9842ba80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=15c9842ba80000 console output: https://syzkaller.appspot.com/x/log.txt?x=11c9842ba80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4fcffdd85e518af6f129@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 47b7ec1daa51 ("gfs2: Enable rgrplvb for sb_fs_format 1802") INFO: task kworker/u4:5:138 blocked for more than 143 seconds. Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack:21344 pid:138 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: <TASK> context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6695 schedule+0xc3/0x180 kernel/sched/core.c:6771 io_schedule+0x8c/0x100 kernel/sched/core.c:9026 folio_wait_bit_common+0x871/0x12a0 mm/filemap.c:1304 folio_lock include/linux/pagemap.h:1042 [inline] write_cache_pages+0x517/0x13f0 mm/page-writeback.c:2441 iomap_writepages+0x68/0x240 fs/iomap/buffered-io.c:1979 gfs2_writepages+0x169/0x1f0 fs/gfs2/aops.c:191 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+0x781/0x1130 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0xabf/0x1060 kernel/workqueue.c:2784 kthread+0x2b8/0x350 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> INFO: task syz-executor336:5029 blocked for more than 143 seconds. Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor336 state:D stack:23408 pid:5029 ppid:5028 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6695 schedule+0xc3/0x180 kernel/sched/core.c:6771 io_schedule+0x8c/0x100 kernel/sched/core.c:9026 folio_wait_bit_common+0x871/0x12a0 mm/filemap.c:1304 folio_lock include/linux/pagemap.h:1042 [inline] write_cache_pages+0x517/0x13f0 mm/page-writeback.c:2441 iomap_writepages+0x68/0x240 fs/iomap/buffered-io.c:1979 gfs2_writepages+0x169/0x1f0 fs/gfs2/aops.c:191 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 mm/filemap.c:432 [inline] filemap_fdatawrite+0x143/0x1b0 mm/filemap.c:437 gfs2_ordered_write fs/gfs2/log.c:740 [inline] gfs2_log_flush+0xa42/0x25f0 fs/gfs2/log.c:1098 gfs2_trans_end+0x39f/0x560 fs/gfs2/trans.c:158 gfs2_page_mkwrite+0x1262/0x14f0 fs/gfs2/file.c:533 do_page_mkwrite+0x197/0x470 mm/memory.c:2931 do_shared_fault mm/memory.c:4647 [inline] do_fault mm/memory.c:4709 [inline] do_pte_missing mm/memory.c:3669 [inline] handle_pte_fault mm/memory.c:4978 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x22b2/0x6200 mm/memory.c:5284 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f088fba48e7 RSP: 002b:00007fff09b9e550 EFLAGS: 00010286 RAX: 0030656c69662f2e RBX: 0000000000000000 RCX: 0000000020000180 RDX: 00000000c018937d RSI: 00000000ffffffff RDI: 0000000000000010 RBP: 00007f088fc5f5f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 00007fff09b9e580 R13: 00007fff09b9e7a8 R14: 431bde82d7b634db R15: 00007f088fc2203b </TASK> INFO: task gfs2_logd:5032 blocked for more than 144 seconds. Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:gfs2_logd state:D stack:28672 pid:5032 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6695 schedule+0xc3/0x180 kernel/sched/core.c:6771 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830 rwsem_down_write_slowpath+0xedd/0x13a0 kernel/locking/rwsem.c:1178 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306 gfs2_log_flush+0x105/0x25f0 fs/gfs2/log.c:1042 gfs2_logd+0x488/0xec0 fs/gfs2/log.c:1325 kthread+0x2b8/0x350 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> INFO: task gfs2_quotad:5033 blocked for more than 144 seconds. Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:gfs2_quotad state:D stack:27216 pid:5033 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6695 schedule+0xc3/0x180 kernel/sched/core.c:6771 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830 rwsem_down_read_slowpath+0x5f4/0x950 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1250 [inline] __down_read kernel/locking/rwsem.c:1263 [inline] down_read+0x9c/0x2f0 kernel/locking/rwsem.c:1522 __gfs2_trans_begin+0x55c/0x940 fs/gfs2/trans.c:87 gfs2_trans_begin+0x71/0xe0 fs/gfs2/trans.c:118 gfs2_statfs_sync+0x41e/0x870 fs/gfs2/super.c:298 quotad_check_timeo fs/gfs2/quota.c:1510 [inline] gfs2_quotad+0x37f/0x680 fs/gfs2/quota.c:1552 kthread+0x2b8/0x350 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 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+0x198/0x310 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+0xdf5/0xe40 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 68 Comm: kworker/u4:4 Not tainted 6.5.0-syzkaller-11075-g92901222f83d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__insn_get_emulate_prefix arch/x86/lib/insn.c:91 [inline] RIP: 0010:insn_get_emulate_prefix arch/x86/lib/insn.c:106 [inline] RIP: 0010:insn_get_prefixes+0x113/0x18a0 arch/x86/lib/insn.c:134 Code: 0f b6 04 03 84 c0 0f 85 fd 10 00 00 41 0f b6 6d 00 bf 0f 00 00 00 89 ee e8 5a 5e c8 f6 4d 8d 65 02 83 fd 0f 0f 85 15 01 00 00 <4d> 39 f4 0f 87 0c 01 00 00 48 8b 44 24 08 48 c1 e8 03 48 b9 00 00 RSP: 0018:ffffc90001597660 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffffffff160ae95 RCX: ffffffff8b0574ab RDX: ffff888018ab8000 RSI: 000000000000000f RDI: 000000000000000f RBP: 000000000000000f R08: ffffffff8ac531f6 R09: 0000000000000000 R10: ffffc900015979c0 R11: fffff520002b2f43 R12: ffffffff8b0574ac R13: ffffffff8b0574aa R14: ffffffff8b0574b9 R15: ffffc900015979c0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555efaf520e8 CR3: 000000000d130000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> insn_get_opcode+0x1b2/0xa50 arch/x86/lib/insn.c:272 insn_get_modrm+0x22e/0x7a0 arch/x86/lib/insn.c:343 insn_get_sib arch/x86/lib/insn.c:421 [inline] insn_get_displacement+0x13e/0x980 arch/x86/lib/insn.c:464 insn_get_immediate+0x382/0x13d0 arch/x86/lib/insn.c:632 insn_get_length arch/x86/lib/insn.c:707 [inline] insn_decode+0x370/0x500 arch/x86/lib/insn.c:747 text_poke_loc_init+0xed/0x860 arch/x86/kernel/alternative.c:2312 arch_jump_label_transform_queue+0x8b/0xf0 arch/x86/kernel/jump_label.c:138 __jump_label_update+0x177/0x3a0 kernel/jump_label.c:475 static_key_disable_cpuslocked+0xce/0x1b0 kernel/jump_label.c:235 static_key_disable+0x1a/0x20 kernel/jump_label.c:243 toggle_allocation_gate+0x1b8/0x250 mm/kfence/core.c:834 process_one_work+0x781/0x1130 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0xabf/0x1060 kernel/workqueue.c:2784 kthread+0x2b8/0x350 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.251 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 overwrite 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
