rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=767/1/0x4000000000000000 softirq=125579/125580 fqs=2771
(t=10500 jiffies g=182497 q=773)
rcu: rcu_preempt kthread starved for 4902 jiffies! g182497 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:26576 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xb72/0x1460 kernel/sched/core.c:6253
schedule+0x12b/0x1f0 kernel/sched/core.c:6326
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1955
rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2128
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
RIP: 0010:acpi_idle_do_entry drivers/acpi/processor_idle.c:553 [inline]
RIP: 0010:acpi_idle_enter+0x42d/0x790 drivers/acpi/processor_idle.c:688
Code: fd 48 83 e3 08 44 8b 7c 24 04 0f 85 22 01 00 00 4c 8d 74 24 40 e8 a3 31 0c fd eb 0c e8 2c 95 05 fd 0f 00 2d 15 b9 63 06 fb f4 <4c> 89 f3 48 c1 eb 03 42 80 3c 23 00 74 08 4c 89 f7 e8 2d 69 51 fd
RSP: 0018:ffffffff8c807ba0 EFLAGS: 00000286
RAX: cc0491aedeaf8800 RBX: 0000000000000000 RCX: ffffffff90bb4903
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8c807c50 R08: ffffffff818b3610 R09: fffffbfff19176d9
R10: fffffbfff19176d9 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888016268864 R14: ffffffff8c807be0 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd504064990 CR3: 000000001e8b3000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
cpuidle_enter_state+0x507/0xea0 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
do_idle+0x3e8/0x670 kernel/sched/idle.c:306
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403
start_kernel+0x4bf/0x56e init/main.c:1135
secondary_startup_64_no_verify+0xb1/0xbb
NMI backtrace for cpu 1
CPU: 1 PID: 1228 Comm: aoe_tx0 Not tainted 5.16.0-rc5-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+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x22d/0x390 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq+0x1e33/0x2bc0 kernel/rcu/tree.c:2597
update_process_times+0x197/0x200 kernel/time/timer.c:1785
tick_sched_handle kernel/time/tick-sched.c:226 [inline]
tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 a2 47 bb f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 67 0f 45 f7 65 8b 05 38 4a ed 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc900056a7920 EFLAGS: 00000206
RAX: f26308a58a6cba00 RBX: 1ffff92000ad4f28 RCX: ffffffff81668171
RDX: dffffc0000000000 RSI: 0000000000000202 RDI: 0000000000000001
RBP: ffffc900056a79c0 R08: dffffc0000000000 R09: fffffbfff1ff3a06
R10: fffffbfff1ff3a06 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000ad4f24 R14: ffffc900056a7940 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
uart_write_room+0x126/0x2b0 drivers/tty/serial/serial_core.c:611
handle_tx+0x14d/0x630 drivers/net/caif/caif_serial.c:226
__netdev_start_xmit include/linux/netdevice.h:4994 [inline]
netdev_start_xmit include/linux/netdevice.h:5008 [inline]
xmit_one net/core/dev.c:3590 [inline]
dev_hard_start_xmit+0x20b/0x450 net/core/dev.c:3606
__dev_queue_xmit+0x1adc/0x35c0 net/core/dev.c:4229
tx+0x6f/0x110 drivers/block/aoe/aoenet.c:63
kthread+0x241/0x450 drivers/block/aoe/aoecmd.c:1230
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
----------------
Code disassembly (best guess):
0: fd std
1: 48 83 e3 08 and $0x8,%rbx
5: 44 8b 7c 24 04 mov 0x4(%rsp),%r15d
a: 0f 85 22 01 00 00 jne 0x132
10: 4c 8d 74 24 40 lea 0x40(%rsp),%r14
15: e8 a3 31 0c fd callq 0xfd0c31bd
1a: eb 0c jmp 0x28
1c: e8 2c 95 05 fd callq 0xfd05954d
21: 0f 00 2d 15 b9 63 06 verw 0x663b915(%rip) # 0x663b93d
28: fb sti
29: f4 hlt
* 2a: 4c 89 f3 mov %r14,%rbx <-- trapping instruction
2d: 48 c1 eb 03 shr $0x3,%rbx
31: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
36: 74 08 je 0x40
38: 4c 89 f7 mov %r14,%rdi
3b: e8 2d 69 51 fd callq 0xfd51696d