INFO: task syz-executor:6519 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc1-syzkaller-00165-gee94b00c1a64 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:17776 pid:6519 tgid:6519 ppid:1 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]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block+0x5ba/0x6d0 kernel/locking/rtmutex.c:1647
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x2b1/0x6e0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:536 [inline]
mutex_lock_nested+0x16a/0x1d0 kernel/locking/rtmutex_api.c:547
journal_flush_done+0x86/0x810 fs/bcachefs/journal_reclaim.c:884
bch2_journal_flush_pins+0x1b5/0x250 fs/bcachefs/journal_reclaim.c:921
bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
__bch2_fs_read_only+0x144/0x5b0 fs/bcachefs/super.c:291
bch2_fs_read_only+0x42a/0xb00 fs/bcachefs/super.c:366
__bch2_fs_stop+0x100/0x900 fs/bcachefs/super.c:677
generic_shutdown_super+0x132/0x2c0 fs/super.c:643
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618
deactivate_locked_super+0xbc/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378
task_work_run+0x1d1/0x260 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: 0033:0x7f14af2cff17
RSP: 002b:00007ffc549e9e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f14af351c05 RCX: 00007f14af2cff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc549e9ef0
RBP: 00007ffc549e9ef0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc549eaf80
R13: 00007f14af351c05 R14: 00000000000416a9 R15: 00007ffc549eafc0
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G W 6.17.0-rc1-syzkaller-00165-gee94b00c1a64 #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+0x711/0x8a0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1470 Comm: kworker/u8:12 Tainted: G W 6.17.0-rc1-syzkaller-00165-gee94b00c1a64 #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_dat_purge
RIP: 0010:rtlock_slowlock kernel/locking/rtmutex.c:1892 [inline]
RIP: 0010:rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
RIP: 0010:__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
RIP: 0010:rt_spin_lock+0x12d/0x2c0 kernel/locking/spinlock_rt.c:57
Code: 89 f7 e8 66 33 25 f7 49 83 3e 00 0f 85 52 01 00 00 48 c7 44 24 40 01 00 00 00 4d 8d 6f 08 4d 89 ee 49 c1 ee 03 43 80 3c 26 00 <74> 08 4c 89 ef e8 29 34 25 f7 4c 89 7c 24 48 48 89 df e8 0c 24 01
RSP: 0018:ffffc900057ff940 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88804e274400 RCX: b4b1e7e879671600
RDX: ffff888028148000 RSI: 0000000000000030 RDI: ffffffff8b0b0b80
RBP: ffffc900057ff9f8 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a747 R12: dffffc0000000000
R13: ffffc900057ff988 R14: 1ffff92000afff31 R15: ffffc900057ff980
FS: 0000000000000000(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a96eaa000 CR3: 00000000791a6000 CR4: 00000000003526f0
Call Trace:
spin_lock_bh include/linux/spinlock_rt.h:88 [inline]
__batadv_dat_purge+0x131/0x400 net/batman-adv/distributed-arp-table.c:173
batadv_dat_purge+0x20/0x70 net/batman-adv/distributed-arp-table.c:204
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 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