rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=ba6c/1/0x4000000000000000 softirq=32562/32564 fqs=33
rcu: 	(detected by 0, t=10502 jiffies, g=25117, q=139 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9361 Comm: syz.0.1001 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:_raw_spin_lock_irqsave+0x73/0xf0
Code: b8 f1 f1 f1 f1 00 f3 f3 f3 49 bc 00 00 00 00 00 fc ff df 4b 89 04 27 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 4c 8b 74 24 20 <fa> 41 f7 c6 00 02 00 00 74 05 e8 9e 00 4a f6 bf 01 00 00 00 e8 14
RSP: 0018:ffffc900001e0880 EFLAGS: 00000802
RAX: f3f3f300f1f1f1f1 RBX: ffff888136627a80 RCX: ffff88803c2ed640
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff888136627a80
RBP: ffffc900001e0918 R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: dffffc0000000000
R13: ffff888136627b00 R14: 0000000000000802 R15: 1ffff9200003c110
FS:  00007f1bbec606c0(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 000000003990a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:do_user_addr_fault+0x1ae/0x1390
Code: 1b 48 89 de 48 81 e6 00 02 00 00 31 ff e8 3a ef 4b 00 48 81 e3 00 02 00 00 0f 84 79 0e 00 00 e8 a8 93 53 00 fb 4c 89 7c 24 38 <0f> 1f 44 00 00 e8 38 ea 4b 00 44 89 f6 83 e6 40 31 ff 48 89 74 24
RSP: 0018:ffffc90004567cb8 EFLAGS: 00000286
RAX: 1160537bc7e73100 RBX: 0000000000000200 RCX: 1160537bc7e73100
RDX: 0000000000000000 RSI: ffffffff8d9bab7c RDI: ffffffff8be34280
RBP: dffffc0000000000 R08: ffffffff8fa3b337 R09: 1ffffffff1f47666
R10: dffffc0000000000 R11: fffffbfff1f47667 R12: ffffc90004567da8
R13: 00002000000029c0 R14: 0000000000000002 R15: ffff88803c2ed640
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:__put_user_4+0xd/0x20
Code: 66 89 01 31 c9 0f 1f 00 e9 50 45 03 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 1f 00 <89> 01 31 c9 0f 1f 00 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90004567e50 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 00002000000029c0
RDX: 0000000000000000 RSI: ffffffff8dbaa21a RDI: ffffffff8be34280
RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffff820c16c0
R10: dffffc0000000000 R11: ffffed1020fff899 R12: 0000000000000000
R13: 00002000000029c0 R14: 0000000000000001 R15: 0000000000000005
 __sys_socketpair+0xb7/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1bbdd8ec29
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:00007f1bbec60038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f1bbdfd5fa0 RCX: 00007f1bbdd8ec29
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007f1bbde11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000029c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1bbdfd6038 R14: 00007f1bbdfd5fa0 R15: 00007ffdca6cd638
 </TASK>
rcu: rcu_preempt kthread starved for 10433 jiffies! g25117 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26920 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: 0 UID: 0 PID: 9360 Comm: syz.0.1001 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_single+0x3a9/0x590
Code: 33 44 89 f6 83 e6 01 31 ff e8 83 7a 0b 00 41 83 e6 01 75 11 e8 38 76 0b 00 4d 89 fe eb 3f e8 2e 76 0b 00 eb 3c 4d 89 fe f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 11 76 0b 00
RSP: 0018:ffffc90002eafa40 EFLAGS: 00000293
RAX: ffffffff81b44b4f RBX: ffffc90002eafa88 RCX: ffff8880234c1cc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002eafb30 R08: ffffc90002eaf8e7 R09: 1ffff920005d5f1c
R10: dffffc0000000000 R11: fffff520005d5f1d R12: 1ffff920005d5f51
R13: dffffc0000000000 R14: 1ffff920005d5f4c R15: 1ffff920005d5f4c
FS:  000055556c05a500(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3d617b CR3: 000000003990a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 event_function_call+0x326/0x970
 perf_event_release_kernel+0x15d/0x510
 perf_release+0x38/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1bbdd8ec29
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:00007ffdca6cd798 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f1bbdfd7da0 RCX: 00007f1bbdd8ec29
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f1bbdfd7da0 R08: 0000000000000224 R09: 0000001eca6cda8f
R10: 00007f1bbdfd7cb0 R11: 0000000000000246 R12: 0000000000029034
R13: 00007f1bbdfd6360 R14: ffffffffffffffff R15: 00007ffdca6cd8b0
 </TASK>
