INFO: task syz.2.627:9000 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.627 state:D stack:27016 pid:9000 ppid:5767 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
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+0x2cb/0x5b0 kernel/sched/completion.c:148
__flush_work+0x913/0xaa0 kernel/workqueue.c:3471
__cancel_work_timer+0x3f8/0x560 kernel/workqueue.c:3558
uhid_dev_destroy drivers/hid/uhid.c:585 [inline]
uhid_char_release+0xaf/0x600 drivers/hid/uhid.c:663
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
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+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff15bf9cdd9
RSP: 002b:00007fff672e2838 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ff15c217da0 RCX: 00007ff15bf9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff15c217da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007ff15c217cb0 R11: 0000000000000246 R12: 000000000005c922
R13: 00007ff15c21609c R14: 000000000005c74d R15: 00007fff672e2940
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d1320e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d1320e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d1320e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5528:
#0: ffff88814ccd30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
3 locks held by kworker/1:4/5806:
1 lock held by syz-executor/9105:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+0xf3d/0xf80 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5806 Comm: kworker/1:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events uhid_device_add_worker
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_is_watching+0x6/0xb0 kernel/rcu/tree.c:699
Code: 8a e8 1e 65 15 09 48 c7 c7 40 89 13 8d 4c 89 f6 e8 bf 68 ec 02 e9 44 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 41 57 <41> 56 53 65 ff 05 d8 d0 92 7e e8 db 7a 15 09 89 c3 83 f8 08 73 60
RSP: 0018:ffffc900001f0d30 EFLAGS: 00000002
RAX: ffffffff8177130b RBX: ffff8880b8f2b7c8 RCX: 0000000000010000
RDX: ffff888053819e00 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900001f0e90 R08: ffffffff8e8b15ef R09: 1ffffffff1d162bd
R10: dffffc0000000000 R11: fffffbfff1d162be R12: ffffc9000470fd80
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc939b3fe8 CR3: 0000000026f58000 CR4: 00000000003506e0
Call Trace:
trace_hrtimer_expire_entry include/trace/events/timer.h:239 [inline]
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x495/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
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:console_trylock_spinning kernel/printk/printk.c:2008 [inline]
RIP: 0010:vprintk_emit+0x46f/0x610 kernel/printk/printk.c:2340
Code: 85 3f 01 00 00 e8 c1 a9 1b 00 45 89 f7 48 85 db 48 8b 1c 24 75 07 e8 b0 a9 1b 00 eb 06 e8 a9 a9 1b 00 fb 48 c7 c7 00 64 12 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 b1
RSP: 0018:ffffc90004ab71a0 EFLAGS: 00000293
RAX: ffffffff816b7857 RBX: ffffffff816b76fb RCX: ffff888053819e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8d126400
RBP: ffffc90004ab7290 R08: ffffffff911c569f R09: 1ffffffff2238ad3
R10: dffffc0000000000 R11: fffffbfff2238ad4 R12: dffffc0000000000
R13: 1ffff92000956e38 R14: 000000000000003a R15: 000000000000003a
dev_vprintk_emit+0x356/0x410 drivers/base/core.c:4953
dev_printk_emit+0xef/0x140 drivers/base/core.c:4964
_dev_warn+0x11f/0x170 drivers/base/core.c:5020
hid_parser_main+0x83b/0xbf0 drivers/hid/hid-core.c:632
hid_open_report+0x861/0xee0 drivers/hid/hid-core.c:1278
hid_parse include/linux/hid.h:1122 [inline]
hid_generic_probe+0x3d/0x80 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2649 [inline]
hid_device_probe+0x293/0x5b0 drivers/hid/hid-core.c:2686
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb20 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
__device_attach_driver+0x2ca/0x510 drivers/base/dd.c:958
bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459
__device_attach+0x2c2/0x420 drivers/base/dd.c:1030
bus_probe_device+0x180/0x260 drivers/base/bus.c:534
device_add+0x85b/0xc20 drivers/base/core.c:3683
hid_add_device+0x38d/0x530 drivers/hid/hid-core.c:2832
uhid_device_add_worker+0x43/0xe0 drivers/hid/uhid.c:73
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 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