rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (9645 ticks this GP) idle=5dcc/1/0x4000000000000000 softirq=96515/96516 fqs=4863
rcu: hardirqs softirqs csw/system
rcu: number: 5824 6925 0
rcu: cputime: 0 752 43174 ==> 52550(ms)
rcu: (detected by 1, t=10507 jiffies, g=125537, q=13073 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18 Comm: migration/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Stopper: 0x0 <- 0x0
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:408
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 cc cc cc cc e8 91 75 f4 fe eb a0 e8 1a 76 f4
RSP: 0018:ffffc900000074a0 EFLAGS: 00000002
RAX: 0000000000000037 RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff83240745 RDI: ffffffff941dcda0
RBP: ffffffff941dcd60 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000037 R14: 0000000000000010 R15: ffffffff832406e0
FS: 0000000000000000(0000) GS:ffff8882686a5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31923ffc CR3: 00000000094ac000 CR4: 00000000003506f0
Call Trace:
serial_port_out include/linux/serial_core.h:811 [inline]
serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3217 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3279 [inline]
serial8250_console_write+0xde8/0x1900 drivers/tty/serial/8250/8250_port.c:3357
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
dev_vprintk_emit+0x394/0x3e0 drivers/base/core.c:4930
dev_printk_emit+0xd2/0x10d drivers/base/core.c:4941
__dev_printk+0xcb/0x100 drivers/base/core.c:4953
_dev_err+0xef/0x127 drivers/base/core.c:4996
urb_ctl_callback.cold+0x41/0x8c drivers/input/misc/yealink.c:456
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xda1/0x36c0 drivers/usb/gadget/udc/dummy_hcd.c:2005
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2011
handle_softirqs+0x1dd/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x160/0x210 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch.isra.0+0x21a/0xa20 kernel/sched/core.c:5245
Code: 08 3c 03 0f 8e 26 06 00 00 c7 83 00 0d 00 00 00 00 00 00 48 8d 7b 48 e8 14 41 ec 05 e8 6f e1 36 00 fb 49 8d bc 24 e8 15 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc9000012fca0 EFLAGS: 00000202
RAX: 0000000000000dbf RBX: ffff8881f5639680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff890c81fc RDI: ffff88810229d168
RBP: ffffc9000012fce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88810229bb80
R13: ffff888119e60000 R14: 0000000000000000 R15: ffff8881f563a380
context_switch kernel/sched/core.c:5391 [inline]
__schedule+0x1140/0x47e0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
smpboot_thread_fn+0x893/0xaa0 kernel/smpboot.c:156
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 1890 jiffies! g125537 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
yealink 8-1:36.0: urb_irq_callback - urb status -71
rcu: Possible timer handling issue on cpu=1 timer-softirq=26503
yealink 8-1:36.0: unexpected response 0
rcu: rcu_preempt kthread starved for 1892 jiffies! g125537 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->cpu=1
yealink 8-1:36.0: urb_ctl_callback - urb status -71
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
yealink 8-1:36.0: urb_irq_callback - urb status -71
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R
yealink 8-1:36.0: unexpected response 0
stack:28056 pid:15 tgid:15 ppid:2 task_flags:0x208040 flags:0x00080000
yealink 8-1:36.0: urb_ctl_callback - urb status -71
Call Trace:
yealink 8-1:36.0: urb_irq_callback - urb status -71
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1138/0x47e0 kernel/sched/core.c:7189
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
yealink 8-1:36.0: urb_ctl_callback - urb status -71
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
kthread+0x370/0x450 kernel/kthread.c:436
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
rcu: Stack dump where RCU GP kthread last ran:
yealink 8-1:36.0: urb_ctl_callback - urb status -71
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
yealink 8-1:36.0: urb_irq_callback - urb status -71
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
yealink 8-1:36.0: unexpected response 0
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
yealink 8-1:36.0: urb_ctl_callback - urb status -71
Code: 44 b7 01 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 63 ad 18 00 fb f4 bc f2 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
yealink 8-1:36.0: urb_irq_callback - urb status -71
RSP: 0018:ffffc9000013fe00 EFLAGS: 00000246
yealink 8-1:36.0: unexpected response 0
RAX: 0000000000c7211d RBX: ffff888102299dc0 RCX: ffffffff876dd475
yealink 8-1:36.0: urb_ctl_callback - urb status -71
RDX: 0000000000000000 RSI: ffffffff890c81fc RDI: ffffffff87b08de0
yealink 8-1:36.0: urb_irq_callback - urb status -71
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed103eae673d
yealink 8-1:36.0: unexpected response 0
R10: ffff8881f57339eb R11: 0000000000000000 R12: 0000000000000001
yealink 8-1:36.0: urb_ctl_callback - urb status -71
R13: ffffed10204533b8 R14: 0000000000000001 R15: ffffffff8af095d0
yealink 8-1:36.0: urb_irq_callback - urb status -71
FS: 0000000000000000(0000) GS:ffff8882687a5000(0000) knlGS:0000000000000000
yealink 8-1:36.0: unexpected response 0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
yealink 8-1:36.0: urb_ctl_callback - urb status -71
CR2: 00007f647c54bd44 CR3: 0000000122a98000 CR4: 00000000003506f0
yealink 8-1:36.0: urb_irq_callback - urb status -71
Call Trace:
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
yealink 8-1:36.0: urb_irq_callback - urb status -71
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
yealink 8-1:36.0: unexpected response 0
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x464/0x590 kernel/sched/idle.c:352
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
yealink 8-1:36.0: unexpected response 0
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
common_startup_64+0x13e/0x148
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_ctl_callback - urb status -71
yealink 8-1:36.0: urb_irq_callback - urb status -71
yealink 8-1:36.0: unexpected response 0
yealink 8-1:36.0: urb_irq_callback - usb_submit_urb failed -19