rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=0c44/1/0x4000000000000000 softirq=23603/32615 fqs=0
rcu: 	(t=10501 jiffies g=15605 q=322 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g15605 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=5873
rcu: rcu_preempt kthread starved for 10501 jiffies! g15605 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:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
CPU: 0 UID: 0 PID: 7299 Comm: syz.2.392 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:__sanitizer_cov_trace_pc+0x11/0x70
Code: 5b e9 a3 ac 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 d0 a0 92 <65> 8b 15 d8 0a e1 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc9000436f478 EFLAGS: 00000202
RAX: ffffffff81b4665b RBX: 1ffff11026cc7f61 RCX: ffff8881073cb980
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000436f600 R08: ffff88801bb3b507 R09: 1ffff110037676a0
R10: dffffc0000000000 R11: ffffed10037676a1 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
FS:  0000555558b5b500(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f1c9c8ba18 CR3: 00000001100e8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 smp_call_function_many_cond+0xd4b/0x12d0
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 exit_mmap+0x44c/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d8e78eba9
Code: Unable to access opcode bytes at 0x7f3d8e78eb7f.
RSP: 002b:00007ffc1d30cdf8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f3d8e9d7da0 RCX: 00007f3d8e78eba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f3d8e9d7da0 R08: 000000000000022c R09: 0000001e1d30d0ef
R10: 00007f3d8e9d7cb0 R11: 0000000000000246 R12: 000000000001c8e7
R13: 00007f3d8e9d6090 R14: ffffffffffffffff R15: 00007ffc1d30cf10
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7327 Comm: syz.1.396 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:kasan_check_range+0x47/0x2c0
Code: 49 39 f8 0f 82 82 02 00 00 49 b9 00 00 00 00 00 80 ff ff eb 11 cc cc cc f3 0f 1e fa 49 b9 00 00 00 00 00 00 00 ff f3 0f 1e fa <4c> 39 cf 0f 82 58 02 00 00 49 89 ff 49 c1 ef 03 49 ba 00 00 00 00
RSP: 0018:ffffc900001e0810 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff888136627a80 RCX: ffffffff819e1c4d
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888136627a80
RBP: ffffc900001e0918 R08: ffff888136627a84 R09: ffff800000000000
R10: dffffc0000000000 R11: fffff5200003c100 R12: dffffc0000000000
R13: ffff888136627b00 R14: ffff888136627a84 R15: 1ffff9200003c110
FS:  00007ff036cb36c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c280289 CR3: 0000000027d7c000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 do_raw_spin_unlock+0x4d/0x240
 _raw_spin_unlock_irqrestore+0x78/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5a 95 20 f6 48 89 df e8 b2 2c 21 f6 e8 4d 7f 4a f6 fb bf 01 00 00 00 <e8> 82 24 13 f6 65 8b 05 cb e0 23 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0018:ffffc9000306fa30 EFLAGS: 00000286
RAX: d5e03aef3f3e8800 RBX: ffff8880238e4280 RCX: d5e03aef3f3e8800
RDX: 0000000000000000 RSI: ffffffff8d9ba163 RDI: 0000000000000001
RBP: ffffc9000306fc10 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8881097942a8 R15: ffff888109793980
 copy_process+0x501/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff035d8eba9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff036cb2fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ff035fd5fa0 RCX: 00007ff035d8eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ff035e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff035fd6038 R14: 00007ff035fd5fa0 R15: 00007ffc2b3b3378
 </TASK>
