INFO: task syz.5.8580:25582 blocked for more than 122 seconds.
      Not tainted 6.12.30-syzkaller-g15d2fe054444 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.8580      state:D
 stack:0     pid:25582 tgid:25581 ppid:24484  flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5947 [inline]
 __schedule+0x132b/0x1e00 kernel/sched/core.c:7775
 __schedule_loop kernel/sched/core.c:7856 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7871
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7928
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:788
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1119
 mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:270
 device_lock include/linux/device.h:1025 [inline]
 usbdev_open+0x171/0x840 drivers/usb/core/devio.c:1051
 chrdev_open+0x4de/0x5f0 fs/char_dev.c:414
 do_dentry_open+0x97b/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: 0033:0x7f99e678d290
RSP: 002b:00007f99e7678b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000101301 RCX: 00007f99e678d290
RDX: 0000000000101301 RSI: 00007f99e7678c10 RDI: 00000000ffffff9c
RBP: 00007f99e7678c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 0000000000000000 R14: 00007f99e69b5fa0 R15: 00007ffc3738b608
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.30-syzkaller-g15d2fe054444 #0 57fdd3e93686ba62eddbadecdc135f5c3b5b89e0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18625 Comm: kworker/0:2 Not tainted 6.12.30-syzkaller-g15d2fe054444 #0 57fdd3e93686ba62eddbadecdc135f5c3b5b89e0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:entity_key kernel/sched/fair.c:590 [inline]
RIP: 0010:avg_vruntime_add kernel/sched/fair.c:658 [inline]
RIP: 0010:__enqueue_entity+0x5b/0x630 kernel/sched/fair.c:889
Code: 00 74 08 4c 89 ef e8 f4 21 7d 00 49 8b 45 00 48 3d 01 08 00 00 41 be 00 08 00 00 4c 0f 43 f0 49 c1 ee 0a 48 85 c0 4c 0f 44 f0 <49> 8d 5d 70 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8
RSP: 0018:ffffc90000007818 EFLAGS: 00000006
RAX: 0000000000100000 RBX: ffff88812debfd60 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88811d63d800 RDI: ffff8881f6e4f9c0
RBP: ffffc90000007898 R08: ffff8881309ddb07 R09: 1ffff1102613bb60
R10: dffffc0000000000 R11: ffffed102613bb61 R12: ffff8881f6e4f9c0
R13: ffff88811d63d800 R14: 0000000000000400 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557cd934a8 CR3: 0000000126708000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000003 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 enqueue_entity+0x448/0xf90 kernel/sched/fair.c:5556
 enqueue_task_fair+0x687/0x17e0 kernel/sched/fair.c:7187
 enqueue_task+0x7df/0x11f0 kernel/sched/core.c:2104
 __activate_task kernel/sched/core.c:2151 [inline]
 activate_task+0x38b/0x3d0 kernel/sched/core.c:2185
 ttwu_do_activate+0x154/0x630 kernel/sched/core.c:4209
 ttwu_queue kernel/sched/core.c:4506 [inline]
 try_to_wake_up+0xd87/0x1b00 kernel/sched/core.c:4845
 wake_up_process+0x14/0x20 kernel/sched/core.c:4980
 hrtimer_wakeup+0x52/0x70 kernel/time/hrtimer.c:1994
 __run_hrtimer kernel/time/hrtimer.c:1758 [inline]
 __hrtimer_run_queues+0x3bd/0x9e0 kernel/time/hrtimer.c:1822
 hrtimer_interrupt+0x37e/0xf00 kernel/time/hrtimer.c:1884
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x8b/0x2b0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x7d/0x90 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2058 [inline]
RIP: 0010:vprintk_emit+0x530/0x640 kernel/printk/printk.c:2442
Code: 81 e6 00 02 00 00 31 ff e8 dd 22 1e 00 48 81 e3 00 02 00 00 75 07 e8 ef 1d 1e 00 eb 06 e8 e8 1d 1e 00 fb c6 05 90 60 30 07 00 <e9> 42 fd ff ff e8 d6 1d 1e 00 e9 a5 fe ff ff 41 ff ce bf 58 89 41
RSP: 0018:ffffc900057df4e0 EFLAGS: 00000283
RAX: ffffffff81678a68 RBX: 0000000000000200 RCX: 0000000000100000
RDX: ffffc9000c10f000 RSI: 00000000000066a0 RDI: 00000000000066a1
RBP: ffffc900057df5b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000afbe8c R12: 1ffff92000afbea0
R13: 0000000000000029 R14: 0000000000000000 R15: dffffc0000000000
 dev_vprintk_emit+0x33b/0x400 drivers/base/core.c:4962
 dev_printk_emit+0xe1/0x130 drivers/base/core.c:4973
 __dev_printk+0x17f/0x1b0 drivers/base/core.c:4985
 _dev_info+0x10b/0x160 drivers/base/core.c:5031
 usb_disconnect+0xe7/0x8f0 drivers/usb/core/hub.c:2297
 hub_port_connect drivers/usb/core/hub.c:5373 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
 port_event drivers/usb/core/hub.c:5833 [inline]
 hub_event+0x1a1b/0x41a0 drivers/usb/core/hub.c:5915
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d5/0x1020 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
 </TASK>