rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11134/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=36833, q=153 ncpus=2)
task:syz.7.1399      state:R  running task     stack:25344 pid:11134 tgid:11133 ppid:11041  task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:debug_lockdep_rcu_enabled+0x16/0x40
Code: cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 57 4b 29 04 00 74 1e 83 3d 6a 7b 29 04 00 <74> 15 65 48 8b 0c 25 08 d0 a0 92 31 c0 83 b9 ec 0a 00 00 00 0f 94
RSP: 0018:ffffc9000333f8f0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff8223061e RCX: 6264f074a049da00
RDX: 0000000000000001 RSI: ffffffff8dba9832 RDI: ffffffff8be33e00
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8172d195
R10: ffffc9000333f508 R11: ffffffff81ac4d00 R12: 1ffff92000667f39
R13: ffffc9000333fa00 R14: ffffc9000333f9c8 R15: ffffffff8172d195
 unwind_next_frame+0xcb/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 pidfs_register_pid+0xa6/0x1b0
 unix_socketpair+0xdc/0x6e0
 __sys_socketpair+0x2bb/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feed2f8eba9
RSP: 002b:00007feed3d56038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007feed31d5fa0 RCX: 00007feed2f8eba9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007feed3011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000029c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feed31d6038 R14: 00007feed31d5fa0 R15: 00007ffe7b15f048
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g36833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=15249
rcu: rcu_preempt kthread starved for 10500 jiffies! g36833 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:26728 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11132 Comm: syz.8.1405 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:strlen+0x32/0x70
Code: 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 <48> ff c3 49 8d 47 01 42 80 7c 3f 01 00 75 de eb 19 89 d9 80 e1 07
RSP: 0000:ffffc9000349f638 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8b8cf500 RCX: ffff888109fd3980
RDX: ffffffff81ada91e RSI: ffff88804b027a98 RDI: ffffffff8b8cf500
RBP: ffffc9000349f748 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000693ee8 R12: 1ffff92000693ed4
R13: ffffffff81ada91e R14: dffffc0000000000 R15: ffffffffffffffff
FS:  00007fc712c616c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001200 CR3: 0000000039a9a000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 perf_trace_lock+0xc2/0x3b0
 lock_release+0x3b2/0x3e0
 _raw_spin_unlock_irqrestore+0x70/0x110
 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+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7fc711d8eba9
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:00007fc712c610e8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007fc711fd5fa8 RCX: 00007fc711d8eba9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc711fd5fac
RBP: 00007fc711fd5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc711fd6038 R14: 00007fffe2ad4d10 R15: 00007fffe2ad4df8
 </TASK>
