INFO: task syz.6.1205:4234 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1205      state:D stack:0     pid:4234  tgid:4233  ppid:3485   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x1399/0x1fa0 kernel/sched/core.c:7870
 __schedule_loop kernel/sched/core.c:7951 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7966
 super_lock+0x168/0x330 fs/super.c:117
 super_lock_shared fs/super.c:142 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:937
 ksys_sync+0xa1/0x170 fs/sync.c:103
 __ia32_sys_sync+0x12/0x20 fs/sync.c:114
 x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f411f19c819
RSP: 002b:00007f412005e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f411f415fa0 RCX: 00007f411f19c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f411f415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f411f416038 R14: 00007f411f415fa0 R15: 00007fff3c4de3f8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 6df8a48c60291494d9389e53691a3df5daca5615
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __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+0x2c6/0x370 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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 350 Comm: kworker/0:5 Not tainted syzkaller #0 6df8a48c60291494d9389e53691a3df5daca5615
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:update_curr+0x607/0x9e0 kernel/sched/fair.c:1323
Code: df e8 1d 2d 80 00 4c 39 2b 74 53 48 8b 44 24 30 42 c6 44 20 06 f8 48 c7 84 24 80 00 00 00 0e 36 e0 45 4a c7 04 20 00 00 00 00 <65> 48 8b 04 25 28 00 00 00 48 3b 84 24 c0 00 00 00 0f 85 be 00 00
RSP: 0018:ffffc900000076e0 EFLAGS: 00000003
RAX: 1ffff92000000eec RBX: ffff8881f6e4fd18 RCX: ffffffff815bc560
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88812310a600
RBP: ffffc900000077f8 R08: ffff88812310a607 R09: 1ffff110246214c0
R10: dffffc0000000000 R11: ffffed10246214c1 R12: dffffc0000000000
R13: ffff88812310a6c0 R14: ffff88812310a730 R15: ffffc90000007790
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff0a187bb0 CR3: 000000012837a000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 enqueue_entity+0x62/0xf60 kernel/sched/fair.c:5415
 enqueue_task_fair+0x42c/0x1840 kernel/sched/fair.c:7092
 enqueue_task+0x829/0x1210 kernel/sched/core.c:2153
 __activate_task kernel/sched/core.c:2200 [inline]
 activate_task+0x387/0x3d0 kernel/sched/core.c:2234
 ttwu_do_activate+0x15d/0x610 kernel/sched/core.c:4278
 ttwu_queue kernel/sched/core.c:4575 [inline]
 try_to_wake_up+0xd99/0x1db0 kernel/sched/core.c:4915
 wake_up_process+0x14/0x20 kernel/sched/core.c:5050
 hrtimer_wakeup+0x52/0x70 kernel/time/hrtimer.c:1989
 __run_hrtimer kernel/time/hrtimer.c:1753 [inline]
 __hrtimer_run_queues+0x3c3/0x9e0 kernel/time/hrtimer.c:1817
 hrtimer_interrupt+0x37e/0xf00 kernel/time/hrtimer.c:1879
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x8e/0x2a0 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:2076 [inline]
RIP: 0010:vprintk_emit+0x547/0x650 kernel/printk/printk.c:2461
Code: 81 e6 00 02 00 00 31 ff e8 16 cb 1e 00 48 81 e3 00 02 00 00 75 07 e8 28 c6 1e 00 eb 06 e8 21 c6 1e 00 fb c6 05 79 06 53 07 00 <e9> 31 fd ff ff e8 0f c6 1e 00 e9 94 fe ff ff 41 ff ce bf 58 89 41
RSP: 0018:ffffc9000b8873c0 EFLAGS: 00000287
RAX: ffffffff8168e4bf RBX: 0000000000000200 RCX: 0000000000100000
RDX: ffffc9000f141000 RSI: 0000000000090771 RDI: 0000000000090772
RBP: ffffc9000b887490 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001710e68 R12: 1ffff92001710e7c
R13: 000000000000003d R14: 0000000000000000 R15: dffffc0000000000
 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_notice+0x11f/0x190 drivers/base/core.c:5030
 usb_get_bos_descriptor+0x724/0xbe0 drivers/usb/core/config.c:1019
 hub_port_init+0x1be8/0x2840 drivers/usb/core/hub.c:5214
 hub_port_connect drivers/usb/core/hub.c:5503 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
 port_event drivers/usb/core/hub.c:5878 [inline]
 hub_event+0x2676/0x4700 drivers/usb/core/hub.c:5960
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d1/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c6/0x370 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
 </TASK>