INFO: task kworker/0:3:356 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3 state:D stack:0 pid:356 tgid:356 ppid:2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x14ce/0x2100 kernel/sched/core.c:7893
__schedule_loop kernel/sched/core.c:7974 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7989
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8046
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
usb_audio_probe+0x39d/0x1d60 sound/usb/card.c:887
usb_probe_interface+0x6ac/0xc00 drivers/usb/core/driver.c:400
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d5/0x890 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+0x267/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 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/0xbf0 drivers/base/core.c:3692
usb_set_configuration+0x1acf/0x20b0 drivers/usb/core/message.c:2268
usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254
usb_probe_device+0x1d4/0x380 drivers/usb/core/driver.c:295
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d5/0x890 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+0x267/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 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/0xbf0 drivers/base/core.c:3692
usb_new_device+0x9f8/0x15b0 drivers/usb/core/hub.c:2703
hub_port_connect drivers/usb/core/hub.c:5574 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
port_event drivers/usb/core/hub.c:5878 [inline]
hub_event+0x30c6/0x4700 drivers/usb/core/hub.c:5960
process_one_work kernel/workqueue.c:3261 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
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
INFO: task kworker/0:5:413 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:5 state:D stack:0 pid:413 tgid:413 ppid:2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x14ce/0x2100 kernel/sched/core.c:7893
__schedule_loop kernel/sched/core.c:7974 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7989
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8046
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
usb_audio_probe+0x39d/0x1d60 sound/usb/card.c:887
usb_probe_interface+0x6ac/0xc00 drivers/usb/core/driver.c:400
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d5/0x890 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+0x267/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 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/0xbf0 drivers/base/core.c:3692
usb_set_configuration+0x1acf/0x20b0 drivers/usb/core/message.c:2268
usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254
usb_probe_device+0x1d4/0x380 drivers/usb/core/driver.c:295
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d5/0x890 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+0x267/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 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/0xbf0 drivers/base/core.c:3692
usb_new_device+0x9f8/0x15b0 drivers/usb/core/hub.c:2703
hub_port_connect drivers/usb/core/hub.c:5574 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
port_event drivers/usb/core/hub.c:5878 [inline]
hub_event+0x30c6/0x4700 drivers/usb/core/hub.c:5960
process_one_work kernel/workqueue.c:3261 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
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
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 29c6904b08c3b1e8518f4116e2e8016f6159917e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
__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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 314 Comm: kworker/1:2 Not tainted syzkaller #0 29c6904b08c3b1e8518f4116e2e8016f6159917e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:console_flush_all+0x0/0xac0 kernel/printk/printk.c:3201
Code: 5f 5d c3 cc cc cc cc cc e8 cd 9a 1e 00 0f 0b eb d9 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc9000b7be358 EFLAGS: 00000246
RAX: dffffc000000000c RBX: ffffc9000b7be378 RCX: 1ffff920016f7c70
RDX: ffffc9000b7be3e0 RSI: ffffc9000b7be378 RDI: 0000000000000000
RBP: ffffc9000b7be450 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0ea5dfc R12: 1ffff920016f7c90
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffc9000b7be3e0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a25c17dac CR3: 000000010c768000 CR4: 00000000003526b0
Call Trace:
vprintk_emit+0x282/0x650 kernel/printk/printk.c:2462
dev_vprintk_emit+0x359/0x420 drivers/base/core.c:4962
dev_printk_emit+0xef/0x150 drivers/base/core.c:4973
__dev_printk+0x17f/0x1b0 drivers/base/core.c:4985
_dev_err+0x11f/0x180 drivers/base/core.c:5028
parse_uac2_sample_rate_range+0xa66/0xd30 sound/usb/format.c:398
parse_audio_format_rates_v2v3+0x3cd/0x1a30 sound/usb/format.c:635
parse_audio_format_i+0x6e5/0xee0 sound/usb/format.c:717
snd_usb_parse_audio_format+0x93/0x750 sound/usb/format.c:795
snd_usb_get_audioformat_uac12 sound/usb/stream.c:857 [inline]
__snd_usb_parse_audio_interface+0x1681/0x47d0 sound/usb/stream.c:1202
snd_usb_parse_audio_interface+0x3e/0xd0 sound/usb/stream.c:1280
create_standard_audio_quirk+0x63/0x130 sound/usb/quirks.c:101
snd_usb_create_quirk sound/usb/quirks.c:541 [inline]
create_composite_quirk+0x21d/0x540 sound/usb/quirks.c:49
snd_usb_create_quirk+0xae/0x130 sound/usb/quirks.c:541
usb_audio_probe+0xb62/0x1d60 sound/usb/card.c:960
usb_probe_interface+0x6ac/0xc00 drivers/usb/core/driver.c:400
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d5/0x890 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+0x267/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 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/0xbf0 drivers/base/core.c:3692
usb_set_configuration+0x1acf/0x20b0 drivers/usb/core/message.c:2268
usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254
usb_probe_device+0x1d4/0x380 drivers/usb/core/driver.c:295
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d5/0x890 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+0x267/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 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/0xbf0 drivers/base/core.c:3692
usb_new_device+0x9f8/0x15b0 drivers/usb/core/hub.c:2703
hub_port_connect drivers/usb/core/hub.c:5574 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
port_event drivers/usb/core/hub.c:5878 [inline]
hub_event+0x30c6/0x4700 drivers/usb/core/hub.c:5960
process_one_work kernel/workqueue.c:3261 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
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