INFO: task udevd:111 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:0 pid:111 tgid:111 ppid:1 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
schedule_hrtimeout_range_clock+0x197/0x320 kernel/time/hrtimer.c:2349
schedule_hrtimeout_range+0x2c/0x40 kernel/time/hrtimer.c:2396
ep_poll fs/eventpoll.c:1986 [inline]
do_epoll_wait+0x15b1/0x1810 fs/eventpoll.c:2414
__do_sys_epoll_wait fs/eventpoll.c:2426 [inline]
__se_sys_epoll_wait fs/eventpoll.c:2421 [inline]
__x64_sys_epoll_wait+0x1d8/0x230 fs/eventpoll.c:2421
x64_sys_call+0x2be4/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:233
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fbccb6a7407
RSP: 002b:00007ffd412db8d0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007fbccbe6a880 RCX: 00007fbccb6a7407
RDX: 0000000000000008 RSI: 00007ffd412dba30 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000
R13: 00005651b6eb3100 R14: 0000000000000000 R15: 0000000000000000
</TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 651adc2629b0b4f371d8cab24d98ca400350956b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xdad/0xf00 kernel/hung_task.c:423
kthread+0x2c9/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 651adc2629b0b4f371d8cab24d98ca400350956b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc cc cc cc cc b8 23 f9 86 ed 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 9c 48 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffffff87407da0 EFLAGS: 000002c2
RAX: ffff8881f6e00000 RBX: ffffffff874156c0 RCX: ffffffff859eba4d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000317dcc
RBP: ffffffff87407da0 R08: ffff8881f6e39733 R09: 1ffff1103edc72e6
R10: dffffc0000000000 R11: ffffed103edc72e7 R12: 1ffffffff0e82ad8
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff87ebca68
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92da548060 CR3: 000000011322c000 CR4: 00000000003526b0
Call Trace:
<TASK>
arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
default_idle+0x17/0x30 arch/x86/kernel/process.c:754
arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x19f/0x4b0 kernel/sched/idle.c:326
cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:424
rest_init+0x10b/0x130 init/main.c:760
start_kernel+0x462/0x4bb init/main.c:1242
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
common_startup_64+0x13b/0x157
</TASK>
read_bulk_callback: 945 callbacks suppressed
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: Rx status -71
usb 10-1: eth1: intr status -71
usb 10-1: eth1: intr status -71
usb 10-1: eth1: intr status -71
usb 10-1: eth1: intr status -71