rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10501 ticks this GP) idle=a59/1/0x4000000000000000 softirq=13997/13997 fqs=0
(t=10502 jiffies g=17069 q=2265)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g17069 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=7642
rcu: rcu_preempt kthread starved for 10505 jiffies! g17069 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28696 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4965 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6246
schedule+0xd2/0x260 kernel/sched/core.c:6319
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
kthread+0x405/0x4f0 kernel/kthread.c:327
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: 9386 Comm: vhost-9383 Not tainted 5.15.0-rc6-next-20211020-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:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:458
print_cpu_stall kernel/rcu/tree_stall.h:602 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3889 [inline]
rcu_sched_clock_irq.cold+0x98/0x746 kernel/rcu/tree.c:2608
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:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_pc+0x50/0x60 kernel/kcov.c:206
Code: 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 83 f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 48 83 c0 01 <48> 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55 41 54 49 89
RSP: 0018:ffffc90005ed7ae8 EFLAGS: 00000216
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900171a9000
RDX: 0000000000040000 RSI: ffffffff86dc8d03 RDI: 0000000000000003
RBP: ffff888022025b00 R08: 0000000000000000 R09: ffffc90005ed7b1f
R10: ffffffff86dc8cf5 R11: 0000000000000000 R12: ffff88806f7df700
R13: 000000000000000f R14: ffffffffffffffff R15: 0000000000000000
vhost_iotlb_itree_iter_first drivers/vhost/iotlb.c:19 [inline]
vhost_iotlb_itree_first+0x83/0x280 drivers/vhost/iotlb.c:169
iotlb_access_ok+0x1ce/0x3e0 drivers/vhost/vhost.c:1336
vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366
handle_rx+0x145/0x1b40 drivers/vhost/net.c:1140
vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 1
CPU: 1 PID: 9386 Comm: vhost-9383 Not tainted 5.15.0-rc6-next-20211020-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:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 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:343
print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3889 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2608
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:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_pc+0x50/0x60 kernel/kcov.c:206
Code: 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 83 f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 48 83 c0 01 <48> 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55 41 54 49 89
RSP: 0018:ffffc90005ed7ae8 EFLAGS: 00000216
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900171a9000
RDX: 0000000000040000 RSI: ffffffff86dc8d03 RDI: 0000000000000003
RBP: ffff888022025b00 R08: 0000000000000000 R09: ffffc90005ed7b1f
R10: ffffffff86dc8cf5 R11: 0000000000000000 R12: ffff88806f7df700
R13: 000000000000000f R14: ffffffffffffffff R15: 0000000000000000
vhost_iotlb_itree_iter_first drivers/vhost/iotlb.c:19 [inline]
vhost_iotlb_itree_first+0x83/0x280 drivers/vhost/iotlb.c:169
iotlb_access_ok+0x1ce/0x3e0 drivers/vhost/vhost.c:1336
vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366
handle_rx+0x145/0x1b40 drivers/vhost/net.c:1140
vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 35 8b 82 ac 15 xor $0x15ac828b,%eax
5: 00 00 add %al,(%rax)
7: 85 c0 test %eax,%eax
9: 74 2b je 0x36
b: 8b 82 88 15 00 00 mov 0x1588(%rdx),%eax
11: 83 f8 02 cmp $0x2,%eax
14: 75 20 jne 0x36
16: 48 8b 8a 90 15 00 00 mov 0x1590(%rdx),%rcx
1d: 8b 92 8c 15 00 00 mov 0x158c(%rdx),%edx
23: 48 8b 01 mov (%rcx),%rax
26: 48 83 c0 01 add $0x1,%rax
* 2a: 48 39 c2 cmp %rax,%rdx <-- trapping instruction
2d: 76 07 jbe 0x36
2f: 48 89 34 c1 mov %rsi,(%rcx,%rax,8)
33: 48 89 01 mov %rax,(%rcx)
36: c3 retq
37: 0f 1f 00 nopl (%rax)
3a: 41 55 push %r13
3c: 41 54 push %r12
3e: 49 rex.WB
3f: 89 .byte 0x89