rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=6b3/1/0x4000000000000000 softirq=17272/17272 fqs=13 
	(t=10500 jiffies g=23425 q=27)
rcu: rcu_preempt kthread starved for 10470 jiffies! g23425 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:28696 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 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
 </TASK>
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: 10969 Comm: syz-executor.2 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0xd0/0x180 mm/kasan/generic.c:189
Code: eb 09 48 83 c0 01 48 39 d0 74 7a 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea <eb> 09 48 83 c0 01 48 39 d0 74 50 80 38 00 74 f2 eb d4 41 bc 08 00
RSP: 0018:ffffc90000007c28 EFLAGS: 00000086
RAX: fffffbfff1b1fa52 RBX: fffffbfff1b1fa53 RCX: ffffffff815c85b1
RDX: fffffbfff1b1fa53 RSI: 0000000000000008 RDI: ffffffff8d8fd290
RBP: fffffbfff1b1fa52 R08: 0000000000000000 R09: ffffffff8d8fd297
R10: fffffbfff1b1fa52 R11: 0000000000000000 R12: ffffffff906e98b8
R13: dffffc0000000000 R14: 1ffff92000000fa7 R15: ffffffff89adfde0
FS:  00007f928f11f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007873a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 cpumask_test_cpu include/linux/cpumask.h:379 [inline]
 cpu_online include/linux/cpumask.h:921 [inline]
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0xa1/0x720 kernel/locking/lockdep.c:5648
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:194
 debug_object_activate+0x287/0x3e0 lib/debugobjects.c:689
 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline]
 debug_activate kernel/time/hrtimer.c:475 [inline]
 enqueue_hrtimer+0x27/0x3e0 kernel/time/hrtimer.c:1084
 __run_hrtimer kernel/time/hrtimer.c:1702 [inline]
 __hrtimer_run_queues+0xb02/0xe50 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:follow_pud_mask mm/gup.c:741 [inline]
RIP: 0010:follow_p4d_mask mm/gup.c:777 [inline]
RIP: 0010:follow_page_mask+0x343/0x1520 mm/gup.c:836
Code: 03 80 3c 02 00 0f 85 20 0f 00 00 48 b8 00 00 00 00 00 00 00 04 4d 8b 27 31 ff 4c 21 e0 48 89 c6 48 89 44 24 10 e8 cd a8 cc ff <48> 8b 44 24 10 48 85 c0 0f 85 91 03 00 00 e8 2a a6 cc ff 4d 89 e7
RSP: 0018:ffffc9000424f298 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000424f3b8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888076e8d700 RDI: 0000000000000003
RBP: ffff8880208ea630 R08: 0000000000000000 R09: ffff888076e8d707
R10: ffffffff81aabe53 R11: 0000000000000000 R12: 000000006f9c6067
R13: 0000000020000000 R14: 0000000000000306 R15: ffff88808ad04000
 __get_user_pages+0x439/0xfb0 mm/gup.c:1158
 __get_user_pages_locked mm/gup.c:1345 [inline]
 get_user_pages_unlocked+0x1b3/0x760 mm/gup.c:2204
 hva_to_pfn_slow arch/x86/kvm/../../../virt/kvm/kvm_main.c:2277 [inline]
 hva_to_pfn+0x1bf/0xdd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2409
 __gfn_to_pfn_memslot+0x229/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2468
 kvm_faultin_pfn+0x50c/0xea0 arch/x86/kvm/mmu/mmu.c:3879
 direct_page_fault+0x42c/0x25f0 arch/x86/kvm/mmu/mmu.c:3912
 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:201 [inline]
 kvm_mmu_page_fault+0x27f/0x1940 arch/x86/kvm/mmu/mmu.c:5196
 handle_ept_violation+0x29c/0x6e0 arch/x86/kvm/vmx/vmx.c:5352
 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6061 [inline]
 vmx_handle_exit+0x4be/0x1950 arch/x86/kvm/vmx/vmx.c:6078
 vcpu_enter_guest+0x2abc/0x4440 arch/x86/kvm/x86.c:9720
 vcpu_run arch/x86/kvm/x86.c:9787 [inline]
 kvm_arch_vcpu_ioctl_run+0x47c/0x1b10 arch/x86/kvm/x86.c:10019
 kvm_vcpu_ioctl+0x570/0xf30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3787
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9291ba9a39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f928f11f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9291cacf60 RCX: 00007f9291ba9a39
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f9291c03c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9ac412cf R14: 00007f928f11f300 R15: 0000000000022000
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 10977 Comm: syz-executor.5 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 48 89 ef 5d e9 41 f4 45 00 5d be 03 00 00 00 e9 f6 80 60 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 69 0b 8b 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc9000451f378 EFLAGS: 00000246
RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90013f3b000
RDX: 0000000000040000 RSI: ffffffff81ab1e05 RDI: 0000000000000003
RBP: ffffc9000451f4d8 R08: 0000000000000000 R09: ffffffff8ff44b5f
R10: ffffffff81ab1dfb R11: 0000000000000000 R12: 0000000000000007
R13: 0000000000000000 R14: ffff888081589000 R15: dffffc0000000000
 lockless_pages_from_mm mm/gup.c:2825 [inline]
 internal_get_user_pages_fast+0x89b/0x2560 mm/gup.c:2861
 get_user_pages_fast_only+0x2b/0x40 mm/gup.c:2915
 get_user_page_fast_only include/linux/mm.h:2022 [inline]
 hva_to_pfn_fast arch/x86/kvm/../../../virt/kvm/kvm_main.c:2245 [inline]
 hva_to_pfn+0xf1/0xdd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2403
 __gfn_to_pfn_memslot+0x229/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2468
 kvm_faultin_pfn+0x50c/0xea0 arch/x86/kvm/mmu/mmu.c:3879
 direct_page_fault+0x42c/0x25f0 arch/x86/kvm/mmu/mmu.c:3912
 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:201 [inline]
 kvm_mmu_page_fault+0x27f/0x1940 arch/x86/kvm/mmu/mmu.c:5196
 handle_ept_violation+0x29c/0x6e0 arch/x86/kvm/vmx/vmx.c:5352
 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6061 [inline]
 vmx_handle_exit+0x4be/0x1950 arch/x86/kvm/vmx/vmx.c:6078
 vcpu_enter_guest+0x2abc/0x4440 arch/x86/kvm/x86.c:9720
 vcpu_run arch/x86/kvm/x86.c:9787 [inline]
 kvm_arch_vcpu_ioctl_run+0x47c/0x1b10 arch/x86/kvm/x86.c:10019
 kvm_vcpu_ioctl+0x570/0xf30 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3787
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd386e36a39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd3843ac188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd386f39f60 RCX: 00007fd386e36a39
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fd386e90c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff27cc712f R14: 00007fd3843ac300 R15: 0000000000022000
 </TASK>
sched: RT throttling activated
----------------
Code disassembly (best guess):
   0:	eb 09                	jmp    0xb
   2:	48 83 c0 01          	add    $0x1,%rax
   6:	48 39 d0             	cmp    %rdx,%rax
   9:	74 7a                	je     0x85
   b:	80 38 00             	cmpb   $0x0,(%rax)
   e:	74 f2                	je     0x2
  10:	48 89 c2             	mov    %rax,%rdx
  13:	b8 01 00 00 00       	mov    $0x1,%eax
  18:	48 85 d2             	test   %rdx,%rdx
  1b:	75 56                	jne    0x73
  1d:	5b                   	pop    %rbx
  1e:	5d                   	pop    %rbp
  1f:	41 5c                	pop    %r12
  21:	c3                   	retq
  22:	48 85 d2             	test   %rdx,%rdx
  25:	74 5e                	je     0x85
  27:	48 01 ea             	add    %rbp,%rdx
* 2a:	eb 09                	jmp    0x35 <-- trapping instruction
  2c:	48 83 c0 01          	add    $0x1,%rax
  30:	48 39 d0             	cmp    %rdx,%rax
  33:	74 50                	je     0x85
  35:	80 38 00             	cmpb   $0x0,(%rax)
  38:	74 f2                	je     0x2c
  3a:	eb d4                	jmp    0x10
  3c:	41                   	rex.B
  3d:	bc                   	.byte 0xbc
  3e:	08 00                	or     %al,(%rax)