rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=f184/1/0x4000000000000000 softirq=29694/29698 fqs=7
rcu: 	(detected by 1, t=10506 jiffies, g=19837, q=569 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8376 Comm: syz.3.644 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:perf_trace_lock_acquire+0x360/0x410
Code: 83 c4 10 4c 8b 64 24 20 48 c7 44 24 40 0e 36 e0 45 4b c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 05 e0 15 04 11 <48> 3b 84 24 a0 00 00 00 75 28 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc900000076c0 EFLAGS: 00000046
RAX: 68c1ab69bdc27300 RBX: ffffe8ff146340c0 RCX: ffffe8ff146340c0
RDX: 0000000000000000 RSI: ffffffff8be33e60 RDI: ffffffff8be33e20
RBP: ffffc900000077c0 R08: 0000000000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 1ffff92000000ee0
R13: 0000000000000012 R14: ffffffff8e009128 R15: dffffc0000000000
FS:  00007f163702c6c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f163702bfc8 CR3: 0000000122ad4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x311/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/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:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 6b 12 b6 f5 cc
RSP: 0018:ffffc90002cbfbd0 EFLAGS: 00000283
RAX: ffffffff81ee6648 RBX: ffff88802fd35800 RCX: 0000000000080000
RDX: ffffc900030f1000 RSI: 00000000000003c1 RDI: 00000000000003c2
RBP: ffffc90002cbfea8 R08: ffffc90002cbfb87 R09: 1ffff92000597f70
R10: dffffc0000000000 R11: fffff52000597f71 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff888125a3a580 R15: dffffc0000000000
 put_ctx+0x18/0x1e0
 perf_ioctl+0xdb2/0x1ec0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f163618eba9
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:00007f163702c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f16363d6090 RCX: 00007f163618eba9
RDX: 0000000000000001 RSI: 0000000000002402 RDI: 0000000000000004
RBP: 00007f1636211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f16363d6128 R14: 00007f16363d6090 R15: 00007fffda671d88
 </TASK>
rcu: rcu_preempt kthread starved for 10470 jiffies! g19837 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     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>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 8372 Comm: syz.3.644 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:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 5e
RSP: 0000:ffffc900070d7720 EFLAGS: 00000293
RAX: ffffffff81b4621b RBX: 1ffff11009608341 RCX: ffff888109ae1cc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900070d78a0 R08: ffffffff8fa3ab37 R09: 1ffffffff1f47566
R10: dffffc0000000000 R11: fffffbfff1f47567 R12: ffff88804b041a08
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
FS:  0000555576f89500(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffda66fc60 CR3: 0000000122ad4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 ptep_clear_flush+0x120/0x170
 do_wp_page+0x1bc2/0x5800
 __handle_mm_fault+0x1033/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f163613c1db
Code: c0 8b 87 c0 00 00 00 66 0f 6c c0 85 c0 0f 85 44 01 00 00 c7 87 c0 00 00 00 ff ff ff ff 48 8d 84 24 20 21 00 00 48 8d 7c 24 20 <0f> 29 44 24 40 49 89 e4 48 89 44 24 50 8b 43 74 48 89 9c 24 00 01
RSP: 002b:00007fffda66fc20 EFLAGS: 00010246
RAX: 00007fffda671d40 RBX: 00007f16363a7640 RCX: 0000000000000000
RDX: 00007fffda671d88 RSI: 00007f1636212ab6 RDI: 00007fffda66fc40
RBP: 000000000000006e R08: 00007f16363d5fa0 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000001 R12: 00007f16363d5fa0
R13: 00007f16363d6720 R14: 0000000000000094 R15: 0000000000000003
 </TASK>
