INFO: task udevd:4387 blocked for more than 143 seconds.
Not tainted 6.1.148-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:23040 pid:4387 ppid:3637 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x555/0xaf0 kernel/locking/mutex.c:747
device_lock include/linux/device.h:837 [inline]
uevent_show+0x16c/0x320 drivers/base/core.c:2669
dev_attr_show+0x50/0xb0 drivers/base/core.c:2372
sysfs_kf_seq_show+0x349/0x4b0 fs/sysfs/file.c:59
seq_read_iter+0x49b/0xd50 fs/seq_file.c:230
call_read_iter include/linux/fs.h:2259 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x434/0x920 fs/read_write.c:470
ksys_read+0x143/0x240 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa9f2ea7407
RSP: 002b:00007ffea5220370 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fa9f3681880 RCX: 00007fa9f2ea7407
RDX: 0000000000001000 RSI: 000055ef70423a10 RDI: 0000000000000008
RBP: 00007fa9f2fefff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007fa9f2fefea0 R14: 0000000000000000 R15: 000055ef70416b30
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0:
ffffffff8cb2b770 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2bf90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8cb2ade0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2ade0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2ade0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4029:
#0: ffff888030556098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198
6 locks held by kworker/1:6/4329:
4 locks held by udevd/4387:
#0: ffff88804c1b10a0 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xad/0xd50 fs/seq_file.c:182
#1: ffff8880555f5888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x51/0x3b0 fs/kernfs/file.c:154
#2: ffff888073df4660 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x71/0x3b0 fs/kernfs/file.c:155
#3: ffff8880598b8190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#3: ffff8880598b8190 (&dev->mutex){....}-{3:3}, at: uevent_show+0x16c/0x320 drivers/base/core.c:2669
2 locks held by syz-executor/12609:
#0: ffff88802b25a0e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cb30ab8 (rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962
2 locks held by kworker/0:9/13193:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc9000cd27d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4329 Comm: kworker/1:6 Not tainted 6.1.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:__rq_lockp kernel/sched/sched.h:1230 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1346 [inline]
RIP: 0010:rq_clock_task kernel/sched/sched.h:1501 [inline]
RIP: 0010:update_curr+0xa8/0x950 kernel/sched/fair.c:885
Code: 00 00 83 3d bd c3 c4 0c 00 74 5a 4c 8d b3 58 0d 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 1e 05 00 00 41 83 3e 00 <48> 89 df 74 20 4c 8d b3 48 0d 00 00 4c 89 f0 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc900001e0b20 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b8f3aa80 RCX: ffffffff815b725a
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880b8f3ab40
RBP: ffff8880b8f3ab40 R08: dffffc0000000000 R09: ffffed100b1aa3b9
R10: ffffed100b1aa3b9 R11: 1ffff1100b1aa3b8 R12: ffff8880b8f3ab90
R13: dffffc0000000000 R14: ffff8880b8f3b7d8 R15: ffff888058d51e40
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe9a877b98 CR3: 0000000028901000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
check_preempt_wakeup+0x6a4/0xb30 kernel/sched/fair.c:7728
check_preempt_curr+0xd4/0x270 kernel/sched/core.c:2179
ttwu_do_wakeup+0x27/0x4f0 kernel/sched/core.c:3646
ttwu_queue kernel/sched/core.c:3904 [inline]
try_to_wake_up+0x5de/0x1080 kernel/sched/core.c:4227
hrtimer_wakeup+0x4a/0x60 kernel/time/hrtimer.c:2006
__run_hrtimer kernel/time/hrtimer.c:1752 [inline]
__hrtimer_run_queues+0x554/0xd60 kernel/time/hrtimer.c:1816
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1878
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1948 [inline]
RIP: 0010:vprintk_emit+0x461/0x680 kernel/printk/printk.c:2302
Code: 85 8f 01 00 00 e8 3f b9 1a 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 2e b9 1a 00 eb 06 e8 27 b9 1a 00 fb 48 c7 c7 60 f0 b1 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 57 db
RSP: 0018:ffffc90003ff6700 EFLAGS: 00000246
RAX: ffffffff81660539 RBX: ffffffff816603e5 RCX: 0000000000100000
RDX: ffffc9001aaeb000 RSI: 00000000000fffff RDI: ffffffff8cb1f060
RBP: ffffc90003ff67f0 R08: dffffc0000000000 R09: fffffbfff215bc87
R10: fffffbfff215bc87 R11: 1ffffffff215bc86 R12: dffffc0000000000
R13: 1ffff920007fece4 R14: 0000000000000200 R15: 0000000000000057
dev_vprintk_emit+0x32d/0x3d3 drivers/base/core.c:4933
dev_printk_emit+0xdd/0x11d drivers/base/core.c:4944
__netdev_printk+0x2ef/0x3d0 net/core/dev.c:11354
netdev_warn+0x107/0x14e net/core/dev.c:11407
asix_read_cmd drivers/net/usb/asix_common.c:33 [inline]
asix_check_host_enable drivers/net/usb/asix_common.c:102 [inline]
__asix_mdio_read drivers/net/usb/asix_common.c:506 [inline]
asix_mdio_read+0x25a/0x540 drivers/net/usb/asix_common.c:529
asix_phy_reset+0xbc/0x1b0 drivers/net/usb/asix_devices.c:215
ax88172_bind+0x3f1/0x5d0 drivers/net/usb/asix_devices.c:275
usbnet_probe+0xb2a/0x2780 drivers/net/usb/usbnet.c:1774
usb_probe_interface+0x5a0/0xaf0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2aa/0xc70 drivers/base/dd.c:639
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:785
driver_probe_device+0x4f/0x420 drivers/base/dd.c:815
__device_attach_driver+0x2c6/0x510 drivers/base/dd.c:943
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x29b/0x460 drivers/base/dd.c:1015
bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489
device_add+0xa00/0xfb0 drivers/base/core.c:3697
usb_set_configuration+0x1991/0x1fd0 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x139/0x270 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2aa/0xc70 drivers/base/dd.c:639
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:785
driver_probe_device+0x4f/0x420 drivers/base/dd.c:815
__device_attach_driver+0x2c6/0x510 drivers/base/dd.c:943
bus_for_each_drv+0x175/0x200 drivers/base/bus.c:429
__device_attach+0x29b/0x460 drivers/base/dd.c:1015
bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489
device_add+0xa00/0xfb0 drivers/base/core.c:3697
usb_new_device+0xd4d/0x1620 drivers/usb/core/hub.c:2659
hub_port_connect drivers/usb/core/hub.c:5517 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
port_event drivers/usb/core/hub.c:5817 [inline]
hub_event+0x2d5e/0x54e0 drivers/usb/core/hub.c:5899
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295