INFO: task udevd:5229 blocked for more than 143 seconds.
Not tainted 6.15.0-rc1-syzkaller-00097-g3baea29dc0a7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:26440 pid:5229 tgid:5229 ppid:2838 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
uevent_show+0x187/0x3b0 drivers/base/core.c:2730
dev_attr_show+0x53/0xe0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65
seq_read_iter+0x506/0x12c0 fs/seq_file.c:230
kernfs_fop_read_iter+0x40f/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x8c8/0xc70 fs/read_write.c:570
ksys_read+0x12a/0x240 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d7f767b6a
RSP: 002b:00007ffc56010078 EFLAGS: 00000246
ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000056232de93f30 RCX: 00007f0d7f767b6a
RDX: 0000000000001000 RSI: 000056232de30e60 RDI: 0000000000000008
RBP: 000056232de93f30 R08: 0000000000000008 R09: 0000000000040000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffc56010558 R15: 000000000000000a
Showing all locks held in the system:
8 locks held by kworker/0:0/9:
3 locks held by kworker/0:1/10:
1 lock held by khungtaskd/30:
#0: ffffffff890c2840 (rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by kworker/u8:4/170:
2 locks held by getty/2898:
#0: ffff888109a8f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900000432f0
(&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
5 locks held by kworker/0:3/5224:
4 locks held by udevd/5229:
#0: ffff88811c9bcc30
(
&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1:
ffff888112dba888
(
&of->mutex#2
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2:
ffff88810abdc0f8
(
kn->active
#5
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88810b3ca198
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: uevent_show+0x187/0x3b0 drivers/base/core.c:2730
5 locks held by kworker/0:5/5280:
1 lock held by syz-executor/5928:
4 locks held by kworker/u8:8/5934:
#0:
ffff888100ac3948
((wq_completion)netns){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1:
ffffc900022cfd18
(
net_cleanup_work){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffffffff8a39fbd0
(
pernet_ops_rwsem
){++++}-{4:4}
, at: cleanup_net+0xc9/0xb30 net/core/net_namespace.c:608
#3: ffffffff890cdc40
(
rcu_state.barrier_mutex
){+.+.}-{4:4}
, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3774
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.15.0-rc1-syzkaller-00097-g3baea29dc0a7 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.15.0-rc1-syzkaller-00097-g3baea29dc0a7 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_power_efficient gc_worker
RIP: 0010:__asan_memmove+0x27/0x60 mm/kasan/shadow.c:95
Code: 90 90 90 f3 0f 1e fa 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 48 8b 4c 24 18 31 d2 48 89 de 48 89 ef e8 cd ef ff ff 84 c0 74 2b <48> 8b 4c 24 18 ba 01 00 00 00 48 89 de 4c 89 e7 e8 b4 ef ff ff 84
RSP: 0018:ffffc90000006fb0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000003 RCX: ffffffff8720577b
RDX: fffff52000000e83 RSI: 0000000000000003 RDI: ffffc9000000740f
RBP: ffffc9000000740f R08: 0000000000000000 R09: fffff52000000e82
R10: ffffc90000007411 R11: 0000000000156808 R12: ffffc90000007412
R13: 000000007ffffffe R14: 0000000000000003 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8882691c7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2894381000 CR3: 000000010b79c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
move_right lib/vsprintf.c:597 [inline]
widen_string+0x29b/0x2d0 lib/vsprintf.c:620
string_nocheck lib/vsprintf.c:647 [inline]
string+0x2bc/0x4f0 lib/vsprintf.c:721
vsnprintf+0x4bc/0x1160 lib/vsprintf.c:2852
sprintf+0xcc/0x100 lib/vsprintf.c:3015
print_caller kernel/printk/printk.c:1392 [inline]
info_print_prefix+0x146/0x350 kernel/printk/printk.c:1409
record_print_text+0x140/0x400 kernel/printk/printk.c:1456
printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3024
console_emit_next_record kernel/printk/printk.c:3092 [inline]
console_flush_all+0x6ea/0xc60 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
dev_vprintk_emit drivers/base/core.c:4891 [inline]
dev_printk_emit+0xfa/0x140 drivers/base/core.c:4902
__dev_printk+0xf5/0x270 drivers/base/core.c:4914
_dev_warn+0xe4/0x120 drivers/base/core.c:4958
usb_rx_callback_intf0+0x11c/0x1a0 drivers/media/rc/imon.c:1768
__usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1650
usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1734
dummy_timer+0x180e/0x3a20 drivers/usb/gadget/udc/dummy_hcd.c:1994
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
handle_softirqs+0x205/0x8d0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:391 [inline]
RIP: 0010:__rcu_read_lock+0x10/0xf0 kernel/rcu/tree_plugin.h:414
Code: 24 eb b9 0f 1f 80 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 b8 00 00 00 00 00 fc ff df 55 53 <65> 48 8b 1d 60 52 03 0b 48 8d bb fc 03 00 00 48 89 fa 48 c1 ea 03
RSP: 0018:ffffc9000009fb48 EFLAGS: 00000293
RAX: dffffc0000000000 RBX: 0000000000026c9d RCX: ffffffff8638b8d9
RDX: ffff8881016a0000 RSI: ffffffff8638aae9 RDI: 0000000000000004
RBP: ffffffff93a29fec R08: 0000000000000004 R09: 0000000000026c9d
R10: 0000000000040000 R11: 0000000000000000 R12: ffff888112200000
R13: 0000000000040000 R14: dffffc0000000000 R15: 0000000000001770
rcu_read_lock include/linux/rcupdate.h:839 [inline]
gc_worker+0x21e/0x16d0 net/netfilter/nf_conntrack_core.c:1532
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245