syzbot


INFO: rcu detected stall in internal_create_groups

Status: auto-obsoleted due to no activity on 2026/05/28 23:18
Subsystems: kernfs
Labels: prio:high
[Documentation on labels]
First crash: 125d, last: 125d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
047bcd3e-9a39-4b7c-9d11-19c8dcabb725 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ INFO: rcu detected stall in internal_create_groups 2026/05/18 14:08 2026/05/18 14:08 2026/05/18 14:50 d77e94325d4257b6d46f84ec600c478b4f1b6a3d

			
		

Sample crash report:
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=105605, q=1393 ncpus=2)
task:kworker/0:3     state:R  running task     stack:21304 pid:5204  tgid:5204  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x19e/0x320 kernel/locking/lockdep.c:5893
RSP: 0018:ffffc90003f1f530 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff896e05a0 RCX: ffffc90003f1f53c
RDX: 0000000000000004 RSI: ffffffff88ffc446 RDI: ffffffff87afa420
RBP: ffffffff8245b82e R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888117bc0000
R13: ffff888101298118 R14: 0000000000000202 R15: 0000000000000005
 rcu_lock_release include/linux/rcupdate.h:322 [inline]
 rcu_read_unlock include/linux/rcupdate.h:881 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1193 [inline]
 kernfs_root+0xf3/0x2a0 fs/kernfs/kernfs-internal.h:75
 kernfs_activate fs/kernfs/dir.c:1434 [inline]
 kernfs_add_one+0x55e/0x850 fs/kernfs/dir.c:839
 sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:313
 internal_create_groups+0x9d/0x150 fs/sysfs/group.c:229
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
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yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0
yealink 2-1:36.0: urb_ctl_callback - urb status -71
yealink 2-1:36.0: urb_irq_callback - urb status -71
yealink 2-1:36.0: unexpected response 0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/27 23:16 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing bb375c251ab4 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in internal_create_groups
* Struck through repros no longer work on HEAD.