INFO: task syz.0.3161:9840 blocked for more than 122 seconds.
Not tainted 6.12.38-syzkaller-gd64d8b7dab32 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3161 state:D stack:0 pid:9840 tgid:9839 ppid:5940 flags:0x00000004
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: 0033:0x7f254c18d310
RSP: 002b:00007f254cfdfb70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000080000 RCX: 00007f254c18d310
RDX: 0000000000080000 RSI: 00007f254cfdfc10 RDI: 00000000ffffff9c
RBP: 00007f254cfdfc10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 0000000000000000 R14: 00007f254c3b5fa0 R15: 00007ffe03bec3a8
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-gd64d8b7dab32 #0 b11b2e695edb96cef1ea16b3c17c686b1091986c
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: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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 64 Comm: kworker/0:2 Not tainted 6.12.38-syzkaller-gd64d8b7dab32 #0 b11b2e695edb96cef1ea16b3c17c686b1091986c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:update_cpu_capacity kernel/sched/fair.c:10249 [inline]
RIP: 0010:update_group_capacity+0x404/0x9f0 kernel/sched/fair.c:10273
Code: 4c 89 ef e8 be 43 7e 00 48 be 00 00 00 00 00 fc ff df 4d 03 7d 00 4c 89 f1 4c 29 f9 76 13 48 0f af cb 48 89 c8 31 d2 49 f7 f6 <49> 39 ce 4c 0f 46 e0 48 8b 44 24 30 80 3c 30 00 4c 8b 74 24 18 74
RSP: 0018:ffffc90000007840 EFLAGS: 00000246
RAX: 000000000000007e RBX: 00000000000003fa RCX: 000000000001f906
RDX: 0000000000000106 RSI: dffffc0000000000 RDI: ffff8881f6e50570
RBP: ffffc90000007910 R08: ffff888103e515af R09: 1ffff110207ca2b5
R10: dffffc0000000000 R11: ffffed10207ca2b6 R12: 0000000000000001
R13: ffff8881f6e505b0 R14: 0000000000000400 R15: 0000000000000381
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8377b83178 CR3: 000000010caf2000 CR4: 00000000003526b0
Call Trace:
update_sd_lb_stats kernel/sched/fair.c:11293 [inline]
sched_balance_find_src_group kernel/sched/fair.c:11556 [inline]
sched_balance_rq+0x89b/0x5060 kernel/sched/fair.c:12003
sched_balance_domains+0x4b4/0xa10 kernel/sched/fair.c:12469
sched_balance_softirq+0xbd/0x170 kernel/sched/fair.c:13196
handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
__do_softirq kernel/softirq.c:659 [inline]
invoke_softirq kernel/softirq.c:476 [inline]
__irq_exit_rcu+0x48/0xc0 kernel/softirq.c:708
irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2076 [inline]
RIP: 0010:vprintk_emit+0x530/0x640 kernel/printk/printk.c:2460
Code: 81 e6 00 02 00 00 31 ff e8 8d 22 1e 00 48 81 e3 00 02 00 00 75 07 e8 9f 1d 1e 00 eb 06 e8 98 1d 1e 00 fb c6 05 e0 5e 30 07 00 42 fd ff ff e8 86 1d 1e 00 e9 a5 fe ff ff 41 ff ce bf 58 89 41
RSP: 0018:ffffc90000d4e7e0 EFLAGS: 00000246
RAX: ffffffff8167ac18 RBX: 0000000000000200 RCX: 0000000000100000
RDX: ffffc9000cd1c000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc90000d4e8b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001a9cec R12: 1ffff920001a9d00
R13: 0000000000000059 R14: 0000000000000000 R15: dffffc0000000000
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:11899
netdev_err+0x10b/0x170 net/core/dev.c:11951
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+0x9a7/0x2850 drivers/net/usb/usbnet.c:1772
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+0x260/0x2f0 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+0x260/0x2f0 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: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:5837 [inline]
hub_event+0x2c81/0x4270 drivers/usb/core/hub.c:5919
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