INFO: task syz.3.1910:6056 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1910 state:D stack:0 pid:6056 tgid:6053 ppid:5467 flags:0x00004004
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
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: 0033:0x7f699dd8ebe9
RSP: 002b:00007f699ebc6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f699dfb6180 RCX: 00007f699dd8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f699dfb6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f699dfb6218 R14: 00007f699dfb6180 R15: 00007ffcc1c04c78
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 c6196c673b5935b37251aae71b5d8ba93d255e6c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10924 Comm: kworker/1:6 Not tainted syzkaller #0 c6196c673b5935b37251aae71b5d8ba93d255e6c
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_pc+0x40/0x70 kernel/kcov.c:220
Code: 8b 15 ac 06 7f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 ec 0b 00 00 00 74 2c 8b 91 c8 0b 00 00 83 fa 02 75 21 <48> 8b 91 d0 0b 00 00 48 8b 32 48 8d 7e 01 8b 89 cc 0b 00 00 48 39
RSP: 0018:ffffc9000418e8d8 EFLAGS: 00000246
RAX: ffffffff85881e7d RBX: 0000000000000025 RCX: ffff88811d3ba600
RDX: 0000000000000002 RSI: ffffffff87c20520 RDI: 0000000000000025
RBP: ffffc9000418e8d8 R08: ffff88811d3ba600 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000002 R12: ffffffff85c91ee1
R13: 0000000000000000 R14: ffffffff85c91ee1 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555592a5c4a8 CR3: 000000014bf2e000 CR4: 00000000003526b0
Call Trace:
format_decode+0x18d/0x1600 lib/vsprintf.c:2537
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_notice+0x10b/0x170 drivers/base/core.c:5030
usb_parse_endpoint drivers/usb/core/config.c:303 [inline]
usb_parse_interface drivers/usb/core/config.c:594 [inline]
usb_parse_configuration drivers/usb/core/config.c:807 [inline]
usb_get_configuration+0x2531/0x5030 drivers/usb/core/config.c:956
usb_enumerate_device drivers/usb/core/hub.c:2494 [inline]
usb_new_device+0x146/0x1590 drivers/usb/core/hub.c:2632
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+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