mceusb 4-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (9206 ticks this GP) idle=32e/1/0x4000000000000000 softirq=43938/43938 fqs=0
(t=10502 jiffies g=72325 q=57)
rcu: rcu_preempt kthread starved for 10504 jiffies! g72325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R
running task stack:28864 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
print_cpu_stall kernel/rcu/tree_stall.h:623 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9a/0x747 kernel/rcu/tree.c:2641
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
Code: 74 24 10 e8 9a fa 2d f8 48 89 ef e8 42 70 2e f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 03 4e 22 f8 65 8b 05 ec c8 d4 76 85 c0 74 0a 5b 5d c3 e8 e0 aa
RSP: 0018:ffffc90000d979f0 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1fa88a2
RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000001
RBP: ffff888020f6c000 R08: 0000000000000001 R09: ffffffff8fcd5a07
R10: 0000000000000001 R11: ffffc900101d3000 R12: ffff888021203440
R13: ffff8880217e0800 R14: dffffc0000000000 R15: ffff8880185ebb00
spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
dummy_timer+0x12f6/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:2001
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
run_ksoftirqd kernel/softirq.c:920 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 1
CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:342
print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
Code: 74 24 10 e8 9a fa 2d f8 48 89 ef e8 42 70 2e f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 03 4e 22 f8 65 8b 05 ec c8 d4 76 85 c0 74 0a 5b 5d c3 e8 e0 aa
RSP: 0018:ffffc90000d979f0 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1fa88a2
RDX: 0000000000000000 RSI: 0000000000000101 RDI: 0000000000000001
RBP: ffff888020f6c000 R08: 0000000000000001 R09: ffffffff8fcd5a07
R10: 0000000000000001 R11: ffffc900101d3000 R12: ffff888021203440
R13: ffff8880217e0800 R14: dffffc0000000000 R15: ffff8880185ebb00
spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
dummy_timer+0x12f6/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:2001
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
run_ksoftirqd kernel/softirq.c:920 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 4-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 3-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
mceusb 5-1:0.0: Error: urb status = -71
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 24 10 and $0x10,%al
2: e8 9a fa 2d f8 callq 0xf82dfaa1
7: 48 89 ef mov %rbp,%rdi
a: e8 42 70 2e f8 callq 0xf82e7051
f: 81 e3 00 02 00 00 and $0x200,%ebx
15: 75 25 jne 0x3c
17: 9c pushfq
18: 58 pop %rax
19: f6 c4 02 test $0x2,%ah
1c: 75 2d jne 0x4b
1e: 48 85 db test %rbx,%rbx
21: 74 01 je 0x24
23: fb sti
24: bf 01 00 00 00 mov $0x1,%edi
* 29: e8 03 4e 22 f8 callq 0xf8224e31 <-- trapping instruction
2e: 65 8b 05 ec c8 d4 76 mov %gs:0x76d4c8ec(%rip),%eax # 0x76d4c921
35: 85 c0 test %eax,%eax
37: 74 0a je 0x43
39: 5b pop %rbx
3a: 5d pop %rbp
3b: c3 retq
3c: e8 .byte 0xe8
3d: e0 aa loopne 0xffffffe9