INFO: task syz.1.4417:13537 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.4417 state:D stack:0 pid:13537 tgid:13536 ppid:12281 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
device_lock include/linux/device.h:908 [inline]
usbdev_open+0x171/0x840 drivers/usb/core/devio.c:1051
chrdev_open+0x4de/0x5f0 fs/char_dev.c:414
do_dentry_open+0x978/0x1510 fs/open.c:960
vfs_open+0x86/0x230 fs/open.c:1090
do_open fs/namei.c:3774 [inline]
path_openat+0x2b6c/0x34b0 fs/namei.c:3933
do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
do_sys_open fs/open.c:1453 [inline]
__do_sys_openat fs/open.c:1469 [inline]
__se_sys_openat fs/open.c:1464 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1464
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
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: 0033:0x7fa4e7b8d710
RSP: 002b:00007fa4e8a4db70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000c00 RCX: 00007fa4e7b8d710
RDX: 0000000000000c00 RSI: 00007fa4e8a4dc10 RDI: 00000000ffffff9c
RBP: 00007fa4e8a4dc10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007fa4e7de6038 R14: 00007fa4e7de5fa0 R15: 00007ffe7804fe18
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 31062737fedd5a84b75b602a907b4d4b613e131a
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: kworker/1:0 Not tainted syzkaller #0 31062737fedd5a84b75b602a907b4d4b613e131a
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2059 [inline]
RIP: 0010:vprintk_emit+0x49c/0x640 kernel/printk/printk.c:2462
Code: 8b 0c 25 40 eb 04 00 48 39 c8 74 2e c6 05 5b a2 31 07 01 48 c7 c7 a0 77 99 88 e8 8f 49 27 04 80 3d 48 a2 31 07 00 74 57 f3 90 <80> 3d 3d a2 31 07 00 74 53 e8 36 28 1e 00 eb ee e8 2f 28 1e 00 48
RSP: 0018:ffffc900002067e0 EFLAGS: 00000046
RAX: ffffffff8167d5aa RBX: 0000000000000246 RCX: 0000000000100000
RDX: ffffc9000c24a000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc900002068b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000040cec R12: 1ffff92000040d00
R13: 0000000000000057 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c48ff6f98 CR3: 0000000100fc6000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000000b
DR3: 00000000fec0000b DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
dev_vprintk_emit+0x33b/0x400 drivers/base/core.c:4962
dev_printk_emit+0xe1/0x130 drivers/base/core.c:4973
__netdev_printk+0x3f2/0x4e0 net/core/dev.c:11911
netdev_err+0x10b/0x170 net/core/dev.c:11963
asix_set_sw_mii drivers/net/usb/asix_common.c:78 [inline]
asix_check_host_enable drivers/net/usb/asix_common.c:98 [inline]
__asix_mdio_read drivers/net/usb/asix_common.c:484 [inline]
asix_mdio_read+0x20a/0x4b0 drivers/net/usb/asix_common.c:507
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+0x9aa/0x2850 drivers/net/usb/usbnet.c:1775
usb_probe_interface+0x696/0xc00 drivers/usb/core/driver.c:403
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d6/0x890 drivers/base/dd.c:657
__driver_probe_device+0x198/0x280 drivers/base/dd.c:799
driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
__device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
bus_for_each_drv+0x25d/0x2f0 drivers/base/bus.c:459
__device_attach+0x2bd/0x3a0 drivers/base/dd.c:1029
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xc00 drivers/base/core.c:3692
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+0x1d4/0x380 drivers/usb/core/driver.c:298
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d6/0x890 drivers/base/dd.c:657
__driver_probe_device+0x198/0x280 drivers/base/dd.c:799
driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
__device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
bus_for_each_drv+0x25d/0x2f0 drivers/base/bus.c:459
__device_attach+0x2bd/0x3a0 drivers/base/dd.c:1029
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xc00 drivers/base/core.c:3692
usb_new_device+0x9ed/0x1590 drivers/usb/core/hub.c:2690
hub_port_connect drivers/usb/core/hub.c:5561 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5701 [inline]
port_event drivers/usb/core/hub.c:5865 [inline]
hub_event+0x2c81/0x4270 drivers/usb/core/hub.c:5947
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+0x2ca/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