INFO: task syz-executor:15829 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21560 pid:15829 tgid:15829 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x147b/0x4f50 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7241
rwbase_write_lock+0x3da/0x730 kernel/locking/rwbase_rt.c:272
__super_lock fs/super.c:57 [inline]
__super_lock_excl fs/super.c:72 [inline]
deactivate_super+0xa9/0xe0 fs/super.c:506
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1318
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa7481fbf17
RSP: 002b:00007ffc1aa79cd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa74826471f RCX: 00007fa7481fbf17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc1aa79d90
RBP: 00007ffc1aa79d90 R08: 00007ffc1aa7ad90 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1aa7ae20
R13: 00007fa74826471f R14: 000000000013c214 R15: 00007ffc1aa7ae60
INFO: task syz.7.2059:19789 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.2059 state:D stack:25400 pid:19789 tgid:19788 ppid:16919 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x147b/0x4f50 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x164/0x360 kernel/sched/core.c:6960
jfs_flush_journal+0x729/0xef0 fs/jfs/jfs_logmgr.c:1563
jfs_sync_fs+0x7d/0xa0 fs/jfs/super.c:649
__iterate_supers+0x13d/0x290 fs/super.c:924
ksys_sync+0xbe/0x170 fs/sync.c:104
__ia32_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f539096acb9
RSP: 002b:00007f538ebc6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f5390be5fa0 RCX: 00007f539096acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5390be5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5390be6038 R14: 00007f5390be5fa0 R15: 00007ffc4372b8b8
Showing all locks held in the system:
8 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/38:
#0: ffffffff8d9ae9c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9ae9c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8d9ae9c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
9 locks held by kworker/u8:2/43:
7 locks held by kworker/u8:5/987:
6 locks held by kworker/u8:7/1147:
7 locks held by kworker/u8:17/4293:
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3340
#1: ffffc9000ef47bc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc9000ef47bc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3340
#2: ffff8880a1756fb8 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x332/0x21c0 fs/btrfs/inode.c:3147
#3: ffff8880639f4770 (sb_internal#4){.+.+}-{0:0}, at: btrfs_finish_one_ordered+0x7f2/0x21c0 fs/btrfs/inode.c:3185
#4: ffff8880a1756ea0 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x41b/0xc90 fs/btrfs/transaction.c:298
#5: ffff8880a1756ec8 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x41b/0xc90 fs/btrfs/transaction.c:298
#6: ffff88805d445328 (&ei->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#6: ffff88805d445328 (&ei->lock){+.+.}-{3:3}, at: btrfs_inode_safe_disk_i_size_write+0x96/0x1f0 fs/btrfs/file-item.c:52
1 lock held by klogd/5159:
1 lock held by udevd/5170:
#0: ffff888037138a08 (&ep->lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:93 [inline]
#0: ffff888037138a08 (&ep->lock){+.+.}-{3:3}, at: ep_poll fs/eventpoll.c:2040 [inline]
#0: ffff888037138a08 (&ep->lock){+.+.}-{3:3}, at: do_epoll_wait+0x851/0xbd0 fs/eventpoll.c:2461
2 locks held by getty/5564:
#0: ffff88814e87d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by kworker/1:6/5915:
7 locks held by kworker/u8:19/6426:
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3340
#1: ffffc900068f7bc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc900068f7bc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3340
#2: ffff8880a1756fb8 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x332/0x21c0 fs/btrfs/inode.c:3147
#3: ffff8880639f4770 (sb_internal#4){.+.+}-{0:0}, at: btrfs_finish_one_ordered+0x7f2/0x21c0 fs/btrfs/inode.c:3185
#4: ffff8880a1756ea0 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x41b/0xc90 fs/btrfs/transaction.c:298
#5: ffff8880a1756ec8 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x41b/0xc90 fs/btrfs/transaction.c:298
#6: ffff88805d445328 (&ei->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#6: ffff88805d445328 (&ei->lock){+.+.}-{3:3}, at: btrfs_set_inode_last_trans fs/btrfs/transaction.h:196 [inline]
#6: ffff88805d445328 (&ei->lock){+.+.}-{3:3}, at: btrfs_update_inode+0x1b1/0x340 fs/btrfs/inode.c:4283
6 locks held by kworker/u8:20/6642:
4 locks held by kworker/u8:22/7817:
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3340
#1: ffffc9001e54fbc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc9001e54fbc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3340
#2: ffff8880a1756fb8 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x332/0x21c0 fs/btrfs/inode.c:3147
#3: ffff88805d445468 (&tree->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#3: ffff88805d445468 (&tree->lock){+.+.}-{3:3}, at: set_extent_bit+0x217/0x1ca0 fs/btrfs/extent-io-tree.c:1085
1 lock held by syz-executor/15829:
#0: ffff88803aed00d0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88803aed00d0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88803aed00d0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
1 lock held by syz.7.2059/19789:
#0: ffff88803aed00d0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff88803aed00d0 (&type->s_umount_key#52){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:121
1 lock held by udevd/19833:
2 locks held by udevd/19885:
7 locks held by udevd/20103:
4 locks held by kworker/u8:28/20179:
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88805a196938 ((wq_completion)btrfs-endio-write#40){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3340
#1: ffffc90004f97bc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc90004f97bc0 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3340
#2: ffff8880a1756fb8 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x332/0x21c0 fs/btrfs/inode.c:3147
#3: ffff88805d445468 (&tree->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#3: ffff88805d445468 (&tree->lock){+.+.}-{3:3}, at: set_extent_bit+0x217/0x1ca0 fs/btrfs/extent-io-tree.c:1085
4 locks held by kworker/u8:29/20484:
1 lock held by syz.3.2198/21570:
#0: ffff888037e06258 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_check_last_writer security/integrity/ima/ima_main.c:192 [inline]
#0: ffff888037e06258 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_file_free+0x196/0x4e0 security/integrity/ima/ima_main.c:233
2 locks held by syz.3.2198/21577:
3 locks held by syz.3.2198/21633:
#0: ffff888037e06258 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x7fe/0x1cc0 security/integrity/ima/ima_main.c:300
#1: ffff88805d445ae0 (mapping.invalidate_lock#4){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#1: ffff88805d445ae0 (mapping.invalidate_lock#4){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x192/0x8c0 mm/readahead.c:233
#2: ffff88805d445468 (&tree->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#2: ffff88805d445468 (&tree->lock){+.+.}-{3:3}, at: set_extent_bit+0x217/0x1ca0 fs/btrfs/extent-io-tree.c:1085
1 lock held by syz.6.2199/21583:
2 locks held by syz.4.2200/21630:
2 locks held by syz.9.2201/21636:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xf90/0xfe0 kernel/hung_task.c:515
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5915 Comm: kworker/1:6 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_power_efficient wg_ratelimiter_gc_entries
RIP: 0010:__this_cpu_preempt_check+0xe/0x20 lib/smp_processor_id.c:64
Code: aa 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 c7 c7 e0 64 5f 8b fd fe ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90
RSP: 0018:ffffc900052578d8 EFLAGS: 00000046
RAX: 0000000080000000 RBX: ffffffff8af03dba RCX: 0000000000000046
RDX: 0000000000000002 RSI: ffffffff8d0944fd RDI: ffffffff8b5f64e0
RBP: ffffc90005257a18 R08: ffffffff8aef0bc0 R09: ffffffff8d9ae9c0
R10: 0000000000000000 R11: fffffbfff1e36e4f R12: dffffc0000000000
R13: 1ffff92000a4af2c R14: ffffffff8e3f99e0 R15: ffffffff8e3f99e0
FS: 0000000000000000(0000) GS:ffff8881269d9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e2789e000 CR3: 0000000031206000 CR4: 00000000003526f0
Call Trace:
lockdep_hardirqs_off+0x8d/0xd0 kernel/locking/lockdep.c:4495
trace_hardirqs_off+0x12/0x40 kernel/trace/trace_preemptirq.c:104
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
_raw_spin_lock_irqsave+0x1a/0x60 kernel/locking/spinlock.c:162
rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1417
spin_unlock include/linux/spinlock_rt.h:105 [inline]
wg_ratelimiter_gc_entries+0x3a8/0x480 drivers/net/wireguard/ratelimiter.c:76
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0x89f/0xd90 kernel/workqueue.c:3421
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246