INFO: task udevd:1243 blocked for more than 122 seconds.
Not tainted 6.12.23-syzkaller-g6c1c18fcb8b7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:1243 tgid:1243 ppid:109 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5924 [inline]
__schedule+0x145b/0x1f10 kernel/sched/core.c:7750
__schedule_loop kernel/sched/core.c:7831 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7846
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7903
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x836/0x1b60 kernel/locking/mutex.c:786
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1117
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:270
device_lock include/linux/device.h:1025 [inline]
uevent_show+0x194/0x400 drivers/base/core.c:2730
dev_attr_show+0x69/0xe0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x289/0x3a0 fs/sysfs/file.c:59
kernfs_seq_show+0x12e/0x180 fs/kernfs/file.c:205
seq_read_iter+0x50d/0xfe0 fs/seq_file.c:230
kernfs_fop_read_iter+0x149/0x520 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x53d/0xb60 fs/read_write.c:570
ksys_read+0x141/0x250 fs/read_write.c:713
__do_sys_read fs/read_write.c:723 [inline]
__se_sys_read fs/read_write.c:721 [inline]
__x64_sys_read+0x7f/0x90 fs/read_write.c:721
x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9f822a7407
RSP: 002b:00007ffc471f73c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f9f82a59880 RCX: 00007f9f822a7407
RDX: 0000000000001000 RSI: 000055923d1ec030 RDI: 0000000000000008
RBP: 00007f9f823efff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007f9f823efea0 R14: 0000000000000000 R15: 000055923d1f3fe0
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.23-syzkaller-g6c1c18fcb8b7 #0 ba78288b1e32eb9f88d3f8d8da6b79a037cd8362
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/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:229 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:385
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1210 Comm: kworker/0:5 Not tainted 6.12.23-syzkaller-g6c1c18fcb8b7 #0 ba78288b1e32eb9f88d3f8d8da6b79a037cd8362
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:io_serial_out+0x85/0xd0 drivers/tty/serial/8250/8250_port.c:413
Code: fe 44 89 e1 41 d3 e6 49 83 c7 08 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 84 4f c4 fe 45 03 37 89 d8 44 89 f2 ee <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 44 89 e1 80 e1 07
RSP: 0018:ffffc900102363a8 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc900102363d0 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: ffffffff831717d0 R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000000003f9 R15: ffffffff889d6d08
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2ffb9e CR3: 000000010b322000 CR4: 00000000003526b0
DR0: 0000000000000007 DR1: 000000000000009b DR2: 00040000ffffffff
DR3: 0000000000000009 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
serial_out drivers/tty/serial/8250/8250.h:142 [inline]
serial8250_clear_IER drivers/tty/serial/8250/8250_port.c:-1 [inline]
serial8250_console_write+0x3a6/0x2130 drivers/tty/serial/8250/8250_port.c:3387
univ8250_console_write+0x6f/0xb0 drivers/tty/serial/8250/8250_core.c:396
console_emit_next_record kernel/printk/printk.c:3134 [inline]
console_flush_all+0x5e3/0xaa0 kernel/printk/printk.c:3222
__console_flush_and_unlock kernel/printk/printk.c:3281 [inline]
console_unlock+0xe9/0x270 kernel/printk/printk.c:3321
vprintk_emit+0x27c/0x640 kernel/printk/printk.c:2443
dev_vprintk_emit+0x33b/0x400 drivers/base/core.c:4936
dev_printk_emit+0xe1/0x130 drivers/base/core.c:4947
__netdev_printk+0x3f2/0x4e0 net/core/dev.c:11895
netdev_warn+0x10b/0x160 net/core/dev.c:11948
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+0x25d/0x4b0 drivers/net/usb/asix_common.c:529
asix_phy_reset+0xcc/0x1d0 drivers/net/usb/asix_devices.c:215
ax88172_bind+0x3f1/0x590 drivers/net/usb/asix_devices.c:275
usbnet_probe+0x9a7/0x2850 drivers/net/usb/usbnet.c:1772
usb_probe_interface+0x693/0xc00 drivers/usb/core/driver.c:399
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d3/0x890 drivers/base/dd.c:658
__driver_probe_device+0x198/0x280 drivers/base/dd.c:800
driver_probe_device+0x54/0x3f0 drivers/base/dd.c:830
__device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:958
bus_for_each_drv+0x25d/0x2f0 drivers/base/bus.c:459
__device_attach+0x2bd/0x3a0 drivers/base/dd.c:1030
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1079
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xc00 drivers/base/core.c:3666
usb_set_configuration+0x1ad4/0x20b0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254
usb_probe_device+0x1d1/0x380 drivers/usb/core/driver.c:294
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d3/0x890 drivers/base/dd.c:658
__driver_probe_device+0x198/0x280 drivers/base/dd.c:800
driver_probe_device+0x54/0x3f0 drivers/base/dd.c:830
__device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:958
bus_for_each_drv+0x25d/0x2f0 drivers/base/bus.c:459
__device_attach+0x2bd/0x3a0 drivers/base/dd.c:1030
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1079
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xc00 drivers/base/core.c:3666
usb_new_device+0x9ed/0x1590 drivers/usb/core/hub.c:2662
hub_port_connect drivers/usb/core/hub.c:5533 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x265b/0x41a0 drivers/usb/core/hub.c:5915
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x7d2/0x1020 kernel/workqueue.c:3319
worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244