INFO: task syz.7.2894:9234 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.2894      state:D stack:0     pid:9234  tgid:9231  ppid:3865   flags:0x00004004
Call Trace:
 <TASK>
 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
 super_lock+0x150/0x300 fs/super.c:115
 super_lock_shared fs/super.c:140 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:934
 ksys_sync+0x95/0x160 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:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f848998ebe9
RSP: 002b:00007f848a814038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f8489bb6090 RCX: 00007f848998ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8489bb6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8489bb6128 R14: 00007f8489bb6090 R15: 00007fff02bbf058
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0043dfd2fbaf315da186ee57f2b2b1c8bfff300f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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:267 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2c7/0x370 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: 1488 Comm: kworker/1:4 Not tainted syzkaller #0 0043dfd2fbaf315da186ee57f2b2b1c8bfff300f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:__sanitizer_cov_trace_switch+0x8d/0x130 kernel/kcov.c:351
Code: 84 b8 00 00 00 55 48 89 e5 41 57 41 56 41 54 53 48 8b 55 08 65 4c 8b 04 25 00 eb 04 00 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 <4e> 8b 54 ce 10 65 44 8b 1d ae 00 7f 7e 41 81 e3 00 01 ff 00 74 13
RSP: 0018:ffffc9000ba9eb98 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffffffff85881d7d RSI: ffffffff87c20500 RDI: 0000000000000000
RBP: ffffc9000ba9ebb8 R08: ffff88810d7eb900 R09: 0000000000000000
R10: ffffc9000ba9ed40 R11: fffff52001753dab R12: 000000007fffffff
R13: 0000000000000000 R14: 1ffff92001753d93 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe0e5772020 CR3: 0000000113eba000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 format_decode+0x8d/0x1600 lib/vsprintf.c:2516
 vsnprintf+0xe6/0x1aa0 lib/vsprintf.c:2755
 sprintf+0xda/0x120 lib/vsprintf.c:3007
 print_time kernel/printk/printk.c:1387 [inline]
 info_print_prefix+0x183/0x480 kernel/printk/printk.c:1416
 record_print_text+0x155/0x430 kernel/printk/printk.c:1465
 printk_get_next_message+0x273/0x930 kernel/printk/printk.c:3037
 console_emit_next_record kernel/printk/printk.c:3105 [inline]
 console_flush_all+0x3a4/0xaa0 kernel/printk/printk.c:3239
 __console_flush_and_unlock kernel/printk/printk.c:3298 [inline]
 console_unlock+0xe9/0x270 kernel/printk/printk.c:3338
 vprintk_emit+0x27c/0x640 kernel/printk/printk.c:2462
 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_warn+0x10b/0x160 drivers/base/core.c:5029
 hub_port_init+0x2047/0x27b0 drivers/usb/core/hub.c:5132
 hub_port_connect drivers/usb/core/hub.c:5462 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
 port_event drivers/usb/core/hub.c:5837 [inline]
 hub_event+0x232d/0x4270 drivers/usb/core/hub.c:5919
 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+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>