INFO: task syz.2.3853:18231 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3853 state:D stack:25904 pid:18231 tgid:18229 ppid:14938 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
device_lock include/linux/device.h:1102 [inline]
usbdev_open+0x151/0x770 drivers/usb/core/devio.c:1054
chrdev_open+0x4d9/0x600 fs/char_dev.c:411
do_dentry_open+0x816/0x1380 fs/open.c:947
vfs_open+0x3b/0x340 fs/open.c:1079
do_open fs/namei.c:4700 [inline]
path_openat+0x2e44/0x3830 fs/namei.c:4859
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_sys_openat2+0x115/0x200 fs/open.c:1395
do_sys_open fs/open.c:1401 [inline]
__do_sys_openat fs/open.c:1417 [inline]
__se_sys_openat fs/open.c:1412 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1412
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe96b5d68e
RSP: 002b:00007efe97a02b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007efe97a036c0 RCX: 00007efe96b5d68e
RDX: 0000000000101301 RSI: 00007efe97a02c00 RDI: ffffffffffffff9c
RBP: 00007efe97a02c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007efe96e16038 R14: 00007efe96e15fa0 R15: 00007efe96f3fa48
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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:162 [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:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5709 Comm: kworker/1:6 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 14 1f 62 0c 48 89 de 5b e9 13 c2 61 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d b8 3e 75 11 65 8b 15 d9 3e 75 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000a08b78 EFLAGS: 00000046
RAX: ffffffff81b31124 RBX: 0000000000000000 RCX: ffff888026629f00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a08c50 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000141178 R12: ffff88805a909a88
R13: ffff88805a909a78 R14: ffffffff81b31ff9 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812536a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000404030 CR3: 0000000034aa8000 CR4: 00000000003526f0
Call Trace:
arch_local_irq_restore arch/x86/include/asm/irqflags.h:158 [inline]
seqcount_lockdep_reader_access+0xd4/0x100 include/linux/seqlock.h:75
ktime_get_ts64+0xa9/0x410 kernel/time/timekeeping.c:1114
snd_seq_timer_interrupt+0x303/0x420 sound/core/seq/seq_timer.c:149
snd_timer_process_callbacks sound/core/timer.c:841 [inline]
snd_timer_interrupt+0x1082/0x12f0 sound/core/timer.c:957
snd_hrtimer_callback+0x1b2/0x330 sound/core/hrtimer.c:51
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 22 6d 21 00 fb eb 44 e8 1a 6d 21 00 e8 e5 10 06 0a 4d 85 f6 74 94 e8 0b 6d 21 00 fb 48 c7 c7 e0 be 94 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 ab 1c
RSP: 0018:ffffc90004a7f020 EFLAGS: 00000287
RAX: ffffffff81a4b435 RBX: ffffffff81a4b2af RCX: 0000000000100000
RDX: ffffc9001c0b0000 RSI: 00000000000135e0 RDI: ffffffff8e94bee0
RBP: ffffc90004a7f0d0 R08: ffffffff903142f7 R09: 1ffffffff206285e
R10: dffffc0000000000 R11: fffffbfff206285f R12: 0000000000000000
R13: 000000000000002d R14: 0000000000000200 R15: 1ffff9200094fe08
dev_vprintk_emit+0x338/0x400 drivers/base/core.c:4996
dev_printk_emit+0xee/0x140 drivers/base/core.c:5007
_dev_notice+0x11e/0x180 drivers/base/core.c:5064
usb_parse_configuration drivers/usb/core/config.c:803 [inline]
usb_get_configuration+0xe93/0x5800 drivers/usb/core/config.c:994
usb_enumerate_device drivers/usb/core/hub.c:2527 [inline]
usb_new_device+0x135/0x1620 drivers/usb/core/hub.c:2665
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
IPVS: wlc: UDP 224.0.0.2:0 - no destination available