rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=1994/1/0x4000000000000000 softirq=144538/144539 fqs=2
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18743/1:b..l
rcu: 	(detected by 0, t=26674 jiffies, g=111209, q=27 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 18735 Comm: syz.3.3112 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_read_guest_seg_base+0x384/0x580
Code: 48 8d 9b 24 b1 c4 8b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 82 01 00 00 8b 1b 41 0f 78 de <0f> 86 d4 01 00 00 e8 b1 ec 69 00 4c 89 f8 48 c1 e8 03 48 b9 00 00
RSP: 0018:ffffc90004456e70 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000006808 RCX: dffffc0000000000
RDX: ffffc90029894000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000000 R08: ffff8881aa4cd617 R09: 1ffff11035499ac2
R10: dffffc0000000000 R11: ffffed1035499ac3 R12: ffff8881aa4cf6c0
R13: 1ffff11035499ed8 R14: 0000000000000000 R15: ffff8881aa4cf6e8
FS:  00007ffa24a116c0(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000011060f000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000003e57 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __do_insn_fetch_bytes+0x38f/0x700
 x86_decode_insn+0x38e/0x5df0
 x86_emulate_instruction+0x64a/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: 0033:0x7ffa23b9cdd9
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:00007ffa24a11028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffa23e15fa0 RCX: 00007ffa23b9cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007ffa23c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa23e16038 R14: 00007ffa23e15fa0 R15: 00007ffd824e2058
 </TASK>
task:syz.4.3113      state:R  running task     stack:26712 pid:18743 tgid:18739 ppid:12341  task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 preempt_schedule_notrace+0x57/0x90
 preempt_schedule_notrace_thunk+0x16/0x30
 rcu_is_watching+0x7f/0xb0
 unwind_next_frame+0x1b76/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x2b8/0x640
 __d_alloc+0x37/0x6f0
 d_alloc+0x4b/0x190
 lookup_one_qstr_excl+0xd8/0x360
 start_dirop+0x5c/0x90
 simple_start_creating+0xcc/0x110
 debugfs_start_creating+0xdb/0x1a0
 __debugfs_create_file+0x6f/0x400
 debugfs_create_file_full+0x3f/0x60
 kvm_create_vm_debugfs+0x6ec/0x8f0
 kvm_dev_ioctl+0x11ce/0x1590
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c7219cdd9
RSP: 002b:00007f1c7310d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1c72416090 RCX: 00007f1c7219cdd9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000009
RBP: 00007f1c72232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c72416128 R14: 00007f1c72416090 R15: 00007ffdc0697998
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 26669 jiffies! g111209 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=23563
rcu: rcu_preempt kthread starved for 26670 jiffies! g111209 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:27536 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: 18740 Comm: syz.4.3113 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: 0000000000302634 RBX: 0000000000000008 RCX: 0000000080000100
RDX: 0000000000000003 RSI: ffffffff8dfa6762 RDI: ffffffff8c28af60
RBP: ffffffff8e60a0c0 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: 0000000000000000
R13: 0000000000000000 R14: ffff88816e800000 R15: dffffc0000000000
FS:  00007f1c7312e6c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000112e1c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000003e57 DR2: 0000000000000000
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:vmx_read_guest_seg_base+0x384/0x580
Code: 48 8d 9b 24 b1 c4 8b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 82 01 00 00 8b 1b 41 0f 78 de <0f> 86 d4 01 00 00 e8 b1 ec 69 00 4c 89 f8 48 c1 e8 03 48 b9 00 00
RSP: 0018:ffffc90004eb6e70 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000006808 RCX: dffffc0000000000
RDX: ffffc9002ac99000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000000 R08: ffff888111ac0297 R09: 1ffff11022358052
R10: dffffc0000000000 R11: ffffed1022358053 R12: ffff888111ac2340
R13: 1ffff11022358468 R14: 0000000000000000 R15: ffff888111ac2368
 __do_insn_fetch_bytes+0x38f/0x700
 x86_decode_insn+0x38e/0x5df0
 x86_emulate_instruction+0x64a/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: 0033:0x7f1c7219cdd9
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:00007f1c7312e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1c72415fa0 RCX: 00007f1c7219cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f1c72232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c72416038 R14: 00007f1c72415fa0 R15: 00007ffdc0697998
 </TASK>
