rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=736c/1/0x4000000000000000 softirq=53992/53999 fqs=1
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9550/1:b..l
rcu: 	(detected by 0, t=17448 jiffies, g=39761, q=227 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9547 Comm: syz.3.874 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_vmexit+0x0/0xd0
Code: 0f 1f 84 00 00 00 00 00 f7 44 24 08 01 00 00 00 74 08 0f 01 c3 e9 cf 00 00 00 0f 01 c2 e9 c7 00 00 00 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 50 48 8b 44 24 08 8f 00 48 89 48 08 48 89 50 10 48 89
RSP: 0018:ffffc9000987f470 EFLAGS: 00000002
RAX: 0000000000000028 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7b553af6c0(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010c716000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 </TASK>
task:syz.5.873       state:R  running task     stack:28104 pid:9550  tgid:9544  ppid:6853   task_flags:0x400040 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+0x4ee/0x2550
Code: 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 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe <4c> 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00
RSP: 0018:ffffc9000989f538 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff9063df1c RCX: 0000000000000000
RDX: ffffffff9063dedc RSI: ffffffff90ecf98c RDI: ffffffff8c28af00
RBP: ffffffff9063df1c R08: 0000000000000011 R09: ffffffff8e95cd60
R10: ffffc9000989f658 R11: ffffffff81b0ebd0 R12: ffffffff83b79c9e
R13: ffffffff9063df18 R14: ffffc9000989f608 R15: ffffffff9063df18
 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: 0033:0x7f838d99cdd9
RSP: 002b:00007f838e7c0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f838dc16090 RCX: 00007f838d99cdd9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000008
RBP: 00007f838da32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f838dc16128 R14: 00007f838dc16090 R15: 00007ffeb29f4438
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 17445 jiffies! g39761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=8835
rcu: rcu_preempt kthread starved for 17446 jiffies! g39761 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:26784 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: 9545 Comm: syz.5.873 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: 00000000001fddfe RBX: 0000000000000008 RCX: 0000000080000101
RDX: 0000000000000002 RSI: ffffffff8dfa6762 RDI: ffffffff8c28af60
RBP: ffffffff8e60a0c0 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: 1ffff1102e85d6bf
R13: dffffc0000000000 R14: ffff88816e7da500 R15: dffffc0000000000
FS:  00007f838e7e16c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010db46000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 common_interrupt+0xbb/0xe0
 </IRQ>
 <TASK>
 asm_fred_entry_from_kvm+0x50/0x60
 vmx_handle_exit_irqoff+0x4af/0xa00
 vcpu_run+0x5979/0x7860
 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: 0033:0x7f838d99cdd9
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:00007f838e7e1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f838dc15fa0 RCX: 00007f838d99cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f838da32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f838dc16038 R14: 00007f838dc15fa0 R15: 00007ffeb29f4438
 </TASK>
