INFO: task syz.3.601:2079 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.601       state:D stack:0     pid:2079  tgid:2078  ppid:291    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
 quota_sync_all fs/quota/quota.c:69 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x34e/0x7e0 fs/quota/quota.c:917
 __x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
 x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
 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: 0033:0x7f624119c819
RSP: 002b:00007f624200b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f6241415fa0 RCX: 00007f624119c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f6241232c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6241416038 R14: 00007f6241415fa0 R15: 00007ffe7a045c58
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 6df8a48c60291494d9389e53691a3df5daca5615
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: kworker/1:0 Not tainted syzkaller #0 6df8a48c60291494d9389e53691a3df5daca5615
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:irqentry_exit+0x0/0x60 kernel/entry/common.c:329
Code: e5 e8 c4 05 00 00 b0 01 5d c3 cc cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 b8 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 48 89 e5 f6 87 88 00 00 00 03 74 0c e8 da fe ff ff
RSP: 0018:ffffc90000207070 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc90000207098 RCX: 0000000004208060
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffc90000207098
RBP: ffffc90000207088 R08: ffff888103679300 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81428f00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b1363585d CR3: 00000001256ce000 CR4: 00000000003526b0
Call Trace:
 <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:ffffc90000207140 EFLAGS: 00000283
RAX: ffffffff8168e4bf RBX: 0000000000000200 RCX: 0000000000100000
RDX: ffffc90014e5e000 RSI: 00000000000186a6 RDI: 00000000000186a7
RBP: ffffc90000207210 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000040e18 R12: 1ffff92000040e2c
R13: 0000000000000062 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_parse_endpoint drivers/usb/core/config.c:399 [inline]
 usb_parse_interface drivers/usb/core/config.c:600 [inline]
 usb_parse_configuration drivers/usb/core/config.c:813 [inline]
 usb_get_configuration+0x298d/0x5030 drivers/usb/core/config.c:962
 usb_enumerate_device drivers/usb/core/hub.c:2535 [inline]
 usb_new_device+0x146/0x15b0 drivers/usb/core/hub.c:2673
 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: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>