INFO: task syz.0.495:7017 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.495 state:D
stack:29448 pid:7017 tgid:6984 ppid:2965 task_flags:0x400040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x145d/0x4a00 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0xc69/0x1ca0 kernel/locking/mutex.c:776
uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
kobject_uevent_env+0xb88/0x1920 lib/kobject_uevent.c:608
driver_register+0x2d3/0x4b0 drivers/base/driver.c:257
usb_gadget_register_driver_owner+0x132/0x330 drivers/usb/gadget/udc/core.c:1719
raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
raw_ioctl+0x17ec/0x2e60 drivers/usb/gadget/legacy/raw_gadget.c:1307
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f905f88f34b
RSP: 002b:00007f905e2d3f10 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f905f88f34b
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000006
RBP: 00007f905e2d4fe0 R08: 0000000000000000 R09: 00302e6364755f79
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f905e2d3fb0 R14: 0000200000000740 R15: 00007f905fc124c0
</TASK>
Showing all locks held in the system:
3 locks held by kworker/0:0/9:
2 locks held by kworker/0:1/10:
1 lock held by khungtaskd/30:
#0:
ffffffff892cd6e0
(
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:1/32:
#0: ffff888100ac4948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232
#1: ffffc90000227ca0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233
#2: ffffffff8a6505b0 (
pernet_ops_rwsem){++++}-{4:4}
, at: cleanup_net+0xad/0x900 net/core/net_namespace.c:670
#3: ffffffff892d8d00
(rcu_state.barrier_mutex
){+.+.}-{4:4}
, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816
2 locks held by kworker/0:2/2665:
2 locks held by getty/2918:
#0:
ffff8881127770a0
(&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900000452f0
(&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0x41b/0x1510 drivers/tty/n_tty.c:2211
4 locks held by kworker/0:3/5216:
5 locks held by kworker/0:4/5227:
5 locks held by kworker/0:5/5334:
2 locks held by syz-executor/7019:
#0:
ffffffff8a6505b0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577
#1: ffffffff892d8d00
(rcu_state.barrier_mutex
){+.+.}-{4:4}
, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816
2 locks held by syz-executor/7029:
#0:
ffffffff8a6505b0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577
#1:
ffffffff892d8d00
(
rcu_state.barrier_mutex
){+.+.}-{4:4}
, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816
1 lock held by syz-executor/7039:
2 locks held by syz-executor/7050:
#0:
ffffffff8a6505b0
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577
#1: ffffffff892d8d00
(rcu_state.barrier_mutex
){+.+.}-{4:4}
, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816
2 locks held by syz-executor/7052:
#0: ffffffff8a6505b0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x31b/0x780 net/core/net_namespace.c:577
#1: ffffffff892d8d00
(rcu_state.barrier_mutex
){+.+.}-{4:4}
, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816
1 lock held by syz-executor/7103:
#0: ffffffff892d8e38
(rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:311
1 lock held by syz-executor/7110:
#0: ffffffff892d8e38
(rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:343
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x133/0x180 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xe66/0x1180 kernel/hung_task.c:515
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Sending NMI from CPU 1 to CPUs 0:
cdc_wdm 1-1:1.0: Stall on int endpoint
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5216 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events free_obj_work
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:246
Code: cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 77 da 22 0b <65> 8b 05 88 da 22 0b a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00
RSP: 0018:ffffc900000070b0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000005 RCX: ffffffff87547566
RDX: ffff8881126c57c0 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffffffff885c9f80 R08: 0000000000000001 R09: 0000000000000004
R10: 0000000000000004 R11: 00000000001cd658 R12: 0000000000000004
R13: 0000000000000001 R14: 0000000000000008 R15: ffffc900000072e0
FS: 0000000000000000(0000) GS:ffff888268bf4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a53391000 CR3: 00000000090a6000 CR4: 00000000003506f0
Call Trace:
<IRQ>
__sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:351
vsnprintf+0x176/0x11e0 lib/vsprintf.c:2891
snprintf+0xc7/0x100 lib/vsprintf.c:3041
print_caller kernel/printk/printk.c:1366 [inline]
info_print_prefix+0x134/0x350 kernel/printk/printk.c:1385
record_print_text+0x140/0x400 kernel/printk/printk.c:1432
printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3018
console_emit_next_record kernel/printk/printk.c:3083 [inline]
console_flush_one_record+0x684/0xc60 kernel/printk/printk.c:3215
console_flush_all kernel/printk/printk.c:3289 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
console_unlock+0xef/0x240 kernel/printk/printk.c:3359
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
dev_vprintk_emit drivers/base/core.c:4914 [inline]
dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925
__dev_printk+0xf5/0x270 drivers/base/core.c:4937
_dev_err+0xe4/0x120 drivers/base/core.c:4980
wdm_int_callback+0x3dd/0xbd0 drivers/usb/class/cdc-wdm.c:270
__usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661
usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745
dummy_timer+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x208/0x940 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1056
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x183/0x2d0 kernel/locking/lockdep.c:5893
Code: 0f c1 05 98 4c 47 0b 83 f8 01 0f 85 03 01 00 00 9c 58 f6 c4 02 0f 85 ee 00 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 8d 08 47 0b 0f 85 32 01 00 00 48 83 c4 18 5b 41 5c 41
RSP: 0018:ffffc9000226f638 EFLAGS: 00000206
RAX: e13e1438a386cb00 RBX: ffffffff892cd6e0 RCX: ffffc9000226f644
RDX: 0000000000000002 RSI: ffffffff88ce314f RDI: ffffffff878a7300
RBP: 0000000000000001 R08: 0000000000000001 R09: 00000000216ba027
R10: 0000000000000002 R11: 000000000000e183 R12: ffffffff813c1194
R13: 0000000000000206 R14: ffff8881126c57c0 R15: 0000000000000003
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x43/0x70 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6668 [inline]
kmem_cache_free+0x2a7/0x710 mm/slub.c:6779
free_object_list.isra.0+0xf8/0x2a0 lib/debugobjects.c:326
free_obj_work+0x19d/0x3d0 lib/debugobjects.c:513
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
cdc_wdm 1-1:1.0: wdm_int_callback - usb_submit_urb failed with result -1