INFO: task kworker/u4:0:11 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:0 state:D stack:22376 pid:11 ppid:2 flags:0x00004000
Workqueue: events_unbound fsnotify_mark_destroy_workfn
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0xc1/0x2d0 kernel/time/timer.c:2144
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x2c6/0x5a0 kernel/sched/completion.c:148
__synchronize_srcu+0x339/0x3d0 kernel/rcu/srcutree.c:1386
fsnotify_mark_destroy_workfn+0x10a/0x2e0 fs/notify/mark.c:928
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INFO: task kworker/u4:2:42 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2 state:D stack:21512 pid:42 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0xc1/0x2d0 kernel/time/timer.c:2144
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x2c6/0x5a0 kernel/sched/completion.c:148
__flush_workqueue+0x666/0x1380 kernel/workqueue.c:3260
peer_remove_after_dead+0x94/0x1a0 drivers/net/wireguard/peer.c:116
wg_peer_remove_all+0x44d/0x4f0 drivers/net/wireguard/peer.c:183
wg_destruct+0x17a/0x310 drivers/net/wireguard/device.c:255
netdev_run_todo+0xbe7/0xdb0 net/core/dev.c:10631
default_device_exit_batch+0x967/0xa00 net/core/dev.c:11747
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x792/0xbb0 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INFO: task kworker/u4:11:3487 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:11 state:D stack:22632 pid:3487 ppid:2 flags:0x00004000
Workqueue: events_unbound fsnotify_connector_destroy_workfn
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0xc1/0x2d0 kernel/time/timer.c:2144
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x2c6/0x5a0 kernel/sched/completion.c:148
__synchronize_srcu+0x339/0x3d0 kernel/rcu/srcutree.c:1386
fsnotify_connector_destroy_workfn+0x44/0xa0 fs/notify/mark.c:234
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Showing all locks held in the system:
2 locks held by kworker/u4:0/11:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
#1: ffffc90000107d00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc90000107d00 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
1 lock held by khungtaskd/29:
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
4 locks held by kworker/u4:2/42:
#0: ffff88801a25c938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88801a25c938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
#1: ffffc90000b2fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc90000b2fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
#2: ffffffff8e3c9b10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x14c/0xbb0 net/core/net_namespace.c:606
#3: ffff88805520d468 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_destruct+0x116/0x310 drivers/net/wireguard/device.c:250
2 locks held by kworker/u4:11/3487:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
#1: ffffc9000cac7d00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000cac7d00 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2730
1 lock held by udevd/5143:
#0: ffffffff8d15bbd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x21d0/0x3da0 kernel/fork.c:2605
2 locks held by getty/5537:
#0: ffff88802cb0f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
1 lock held by kworker/dying/23185:
#0: ffffffff8d15bbd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x601/0x2530 kernel/exit.c:831
1 lock held by syz-executor/30017:
#0: ffffffff8d15bbd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x601/0x2530 kernel/exit.c:831
6 locks held by syz-executor/30619:
1 lock held by syz.9.7866/30647:
1 lock held by udevd/30785:
#0: ffffffff8d15bbd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x601/0x2530 kernel/exit.c:831
1 lock held by syz-executor/30787:
#0: ffffffff8d15bbd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x21d0/0x3da0 kernel/fork.c:2605
1 lock held by dhcpcd-run-hook/30789:
#0: ffffffff8d15bbd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x21d0/0x3da0 kernel/fork.c:2605
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 30680 Comm: syz.2.7870 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:196
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 2b 7f 2b 03 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc90000007e80 EFLAGS: 00000046
RAX: 000000000004213c RBX: ffff8880b8e282c0 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000004213c RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: dffffc0000000000
R13: 0000000010004b7f R14: 000000000004213c R15: 0000000000000020
FS: 00007f03f9ee06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 00000000696b2000 CR4: 00000000003526f0
Call Trace:
apic_write arch/x86/include/asm/apic.h:404 [inline]
lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:448
clockevents_program_event+0x1c0/0x310 kernel/time/clockevents.c:334
hrtimer_interrupt+0x565/0x980 kernel/time/hrtimer.c:1893
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__get_user_nocheck_4+0x7/0x20 arch/x86/lib/getuser.S:124
Code: 90 90 90 f3 0f 1e fa 0f 01 cb 0f ae e8 0f b7 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb <0f> ae e8 8b 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900034a78f8 EFLAGS: 00040202
RAX: 00007f03f9edfe40 RBX: 00007f03f9edfe10 RCX: 0000000000000000
RDX: ffffc9000cb99000 RSI: 0000000000000000 RDI: 0000000000080000
RBP: ffffc900034a7ad0 R08: ffffc900034a79cf R09: 1ffff92000694f39
R10: dffffc0000000000 R11: fffff52000694f3a R12: 0000000000000000
R13: 00007f03f9edfe40 R14: dffffc0000000000 R15: 0000000000000000
save_xstate_epilog arch/x86/kernel/fpu/signal.c:139 [inline]
copy_fpstate_to_sigframe+0xa99/0xce0 arch/x86/kernel/fpu/signal.c:245
get_sigframe+0x5de/0x7d0 arch/x86/kernel/signal.c:142
x64_setup_rt_frame+0x164/0xc30 arch/x86/kernel/signal_64.c:175
setup_rt_frame arch/x86/kernel/signal.c:223 [inline]
handle_signal arch/x86/kernel/signal.c:267 [inline]
arch_do_signal_or_restart+0x411/0x7b0 arch/x86/kernel/signal.c:312
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f03f8f9de97
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007f03f9ee0028 EFLAGS: 00000246
RAX: 0000000000000048 RBX: 00007f03f9225fa0 RCX: 00007f03f8f9de99
RDX: 0000200000000280 RSI: 0000000000000026 RDI: 0000000000000003
RBP: 00007f03f9033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03f9226038 R14: 00007f03f9225fa0 R15: 00007fff23445248