rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=3dac/1/0x4000000000000000 softirq=14288/14289 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5954/1:b..l
rcu: 	(detected by 0, t=18032 jiffies, g=11569, q=45 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5955 Comm: syz.1.52 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:vmx_get_gdt+0x62/0x160
Code: 48 c1 e8 03 42 0f b6 04 38 84 c0 75 60 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 75 68 66 44 89 23 b8 16 68 00 00 41 0f 78 c4 <0f> 86 d3 00 00 00 e8 03 c9 69 00 4c 8d 73 02 48 83 c3 09 4c 89 f0
RSP: 0018:ffffc9000890eed8 EFLAGS: 00000202
RAX: 0000000000006816 RBX: ffffc9000890ef80 RCX: 0000000000080000
RDX: ffffc900214b7000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000890f010 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000890ef80 R11: ffffffff814a3890 R12: 00000000000fd000
R13: 0000000000000000 R14: ffffc9000890ef81 R15: dffffc0000000000
FS:  00007f1e88d866c0(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001107dd000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 get_descriptor_ptr+0x131/0x440
 __load_segment_descriptor+0x4a7/0x10a0
 x86_emulate_insn+0x868/0x43d0
 x86_emulate_instruction+0xef0/0x2100
 kvm_mmu_page_fault+0x91a/0xb70
 vmx_handle_exit+0xd70/0x16f0
 vcpu_run+0x5c77/0x7860
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0
 kvm_vcpu_ioctl+0xa62/0xfd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1e87f9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1e88d86028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1e88216090 RCX: 00007f1e87f9cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000000d
RBP: 00007f1e88032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1e88216128 R14: 00007f1e88216090 R15: 00007ffe12f447e8
 </TASK>
task:syz.0.53        state:R  running task     stack:23448 pid:5954  tgid:5951  ppid:5618   task_flags:0x40044c flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x4cb/0x2550
Code: b6 44 24 01 83 e0 07 0f 84 75 16 00 00 83 f8 01 4c 8b 7c 24 50 48 bd 00 00 00 00 00 fc ff df 4c 8b 6c 24 20 0f 84 86 16 00 00 <e9> 03 02 00 00 49 89 d5 48 89 d5 48 89 d8 48 29 e8 48 89 c1 48 c1
RSP: 0018:ffffc900088df298 EFLAGS: 00000202
RAX: 0000000000000002 RBX: ffffffff90b8d5ec RCX: ffffffff90b8d5f0
RDX: ffffffff916c6c24 RSI: ffffffff916c6c18 RDI: ffffffff8c28af00
RBP: dffffc0000000000 R08: 0000000000000003 R09: ffffffff8e95cd60
R10: ffffc900088df3b8 R11: ffffffff81b0ebd0 R12: ffffffff916c6c28
R13: 1ffff9200111be6d R14: ffffc900088df368 R15: ffffffff8176f256
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 kmem_cache_free+0x462/0x650
 tear_down_vmas+0x312/0x520
 exit_mmap+0x4b6/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x18e/0x250
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x840
 exit_to_user_mode_loop+0x8c/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7effb139cdd9
RSP: 002b:00007effb21bf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007effb1616188 RCX: 00007effb139cdd9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007effb1616188
RBP: 00007effb1616180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007effb1616218 R14: 00007ffd9a9140a0 R15: 00007ffd9a914188
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 18031 jiffies! g11569 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=2575
rcu: rcu_preempt kthread starved for 18032 jiffies! g11569 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27968 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 5946 Comm: syz.2.51 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:handle_softirqs+0x160/0x840
Code: 89 6c 24 20 0f b7 db 48 c7 c7 20 1d cb 8b e8 37 01 21 0a 65 66 c7 05 d5 4f b1 11 00 00 e8 c8 0c 46 00 fb 48 c7 c5 c0 a0 60 8e <b8> ff ff ff ff 0f bc c3 41 89 c6 41 ff c6 0f 84 09 04 00 00 89 5c
RSP: 0018:ffffc90000007f28 EFLAGS: 00000202
RAX: 000000000023e834 RBX: 0000000000000008 RCX: 0000000080000101
RDX: 0000000000000002 RSI: ffffffff8dfa6762 RDI: ffffffff8c28af60
RBP: ffffffff8e60a0c0 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: 0000000000000000
R13: 0000000000000000 R14: ffff888109d62500 R15: dffffc0000000000
FS:  00007fd9cfd9f6c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010bf09000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000278a
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 common_interrupt+0xbb/0xe0
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40
RIP: 0010:vcpu_run+0x5a02/0x7860
Code: 4c 8b a4 24 28 01 00 00 4c 89 e3 48 c1 eb 03 42 0f b6 04 3b 84 c0 0f 85 1c 0b 00 00 41 c6 04 24 01 e8 32 ea 85 00 fb 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 5b fc e8 00 49 ff 06
RSP: 0018:ffffc900087875e0 EFLAGS: 00000202
RAX: ffff888169ab1d60 RBX: 1ffff1102d356187 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa6762 RDI: ffffffff8c28af60
RBP: ffffc900087879b0 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: ffff888169ab0c3a
R13: ffff888169ab0000 R14: ffff888169ab1d60 R15: dffffc0000000000
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0
 kvm_vcpu_ioctl+0xa62/0xfd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd9cef9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd9cfd9f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd9cf216090 RCX: 00007fd9cef9cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000009
RBP: 00007fd9cf032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd9cf216128 R14: 00007fd9cf216090 R15: 00007fff42494ce8
 </TASK>
