INFO: task syz.6.277:8714 blocked for more than 143 seconds.
Tainted: G W syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.277 state:D stack:15112 pid:8714 tgid:8713 ppid:6450 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:268 [inline]
__down_common+0x319/0x6a0 kernel/locking/semaphore.c:293
down+0x80/0xd0 kernel/locking/semaphore.c:100
bch2_run_recovery_passes+0x177/0x210 fs/bcachefs/recovery_passes.c:609
bch2_fs_recovery+0x28c9/0x3a50 fs/bcachefs/recovery.c:1050
bch2_fs_start+0xaaf/0xda0 fs/bcachefs/super.c:1213
bch2_fs_get_tree+0xb39/0x1520 fs/bcachefs/fs.c:2488
vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
do_mount fs/namespace.c:4136 [inline]
__do_sys_mount fs/namespace.c:4347 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd937a038a
RSP: 002b:00007fdd919fde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdd919fdef0 RCX: 00007fdd937a038a
RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 00007fdd919fdeb0
RBP: 00002000000000c0 R08: 00007fdd919fdef0 R09: 0000000000810000
R10: 0000000000810000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fdd919fdeb0 R14: 000000000000593a R15: 00002000000006c0
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 39 Comm: khungtaskd Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5826 Comm: syz-executor Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:68 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
RIP: 0010:rwbase_read_trylock kernel/locking/rwbase_rt.c:61 [inline]
RIP: 0010:rwbase_read_lock kernel/locking/rwbase_rt.c:144 [inline]
RIP: 0010:__down_read kernel/locking/rwsem.c:1466 [inline]
RIP: 0010:down_read+0xec/0x1f0 kernel/locking/rwsem.c:1539
Code: b0 f5 91 49 81 c6 a0 0a 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ae 00 26 f7 49 83 3e 00 0f 85 ad 00 00 00 <48> 89 df be 04 00 00 00 e8 07 03 26 f7 48 89 d8 48 c1 e8 03 42 0f
RSP: 0018:ffffc90004de7540 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888028ba8140 RCX: 3949f8920a4c9200
RDX: 0000000000000000 RSI: ffffffff8b620c60 RDI: ffffffff8b620c20
RBP: ffffc90004de75d8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90004de7694 R11: fffff520009bced4 R12: dffffc0000000000
R13: 1ffff920009bcea8 R14: ffffc90004de769d R15: ffff88806a73c000
FS: 000055557fb19500(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f822e8ef000 CR3: 0000000034158000 CR4: 00000000003526f0
Call Trace:
f2fs_down_read fs/f2fs/f2fs.h:2218 [inline]
f2fs_get_node_info+0x117/0x1520 fs/f2fs/node.c:576
read_node_folio+0x20a/0x3f0 fs/f2fs/node.c:1450
__get_node_folio+0x22a/0x1410 fs/f2fs/node.c:1531
f2fs_update_inode_page+0x82/0x190 fs/f2fs/inode.c:766
f2fs_sync_inode_meta fs/f2fs/checkpoint.c:1156 [inline]
block_operations fs/f2fs/checkpoint.c:1263 [inline]
f2fs_write_checkpoint+0xb6e/0x1df0 fs/f2fs/checkpoint.c:1638
kill_f2fs_super+0x2c3/0x6c0 fs/f2fs/super.c:5347
deactivate_locked_super+0xb9/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82ab62ff17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffec4b06478 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f82ab6b1c05 RCX: 00007f82ab62ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffec4b06530
RBP: 00007ffec4b06530 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffec4b075c0
R13: 00007f82ab6b1c05 R14: 000000000004791f R15: 00007ffec4b07600