rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=f444/1/0x4000000000000000 softirq=33804/33804 fqs=0
rcu: 	(detected by 1, t=10505 jiffies, g=27917, q=323 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10377 Comm: syz.1.1317 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:__lock_acquire+0x45/0xd20
Code: 31 ff 83 3d cc 6f 06 0e 00 0f 84 7e 0c 00 00 48 8b 03 48 3d 20 b3 64 93 0f 84 6f 0c 00 00 41 89 cc 41 89 d6 8b 0d ab 36 63 0c <85> c9 44 0f 44 c1 31 c9 48 3d 10 b3 64 93 41 0f 45 c8 89 4c 24 0c
RSP: 0018:ffffc90000007750 EFLAGS: 00000087
RAX: ffff88804b027a98 RBX: ffff88804b027a98 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88810cbc9cc0
RBP: ffffffff81adabcb R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000000
R13: ffff88804b027a98 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8a411ee6c0(0000) GS:ffff8880b8611000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c24a0db CR3: 000000011fac0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _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:cap_capable+0x49/0x460
Code: 00 00 fc ff df e8 27 a0 46 fd 4d 8d a7 90 00 00 00 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 4b c5 aa fd 4d 8b 24 24 <4d> 39 e6 0f 85 fe 00 00 00 e8 f9 9f 46 fd 4d 8d 6f 40 4c 89 e8 48
RSP: 0018:ffffc90007887cd8 EFLAGS: 00000246
RAX: 1ffff11004331f92 RBX: 000000000000000d RCX: 0000000000080000
RDX: ffffc9000f2d9000 RSI: 000000000000008a RDI: 000000000000008b
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8a2ac6f3
R10: ffff8880306f0f50 R11: ffffffff8a2ac670 R12: ffffffff8dfdd580
R13: 000000000000003a R14: ffffffff8dfdd580 R15: ffff88802198fc00
 security_capable+0xa3/0x2e0
 ns_capable+0x6f/0xf0
 inet6_create+0x5d0/0x1260
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8a42f8ec29
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:00007f8a411ee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f8a431d5fa0 RCX: 00007f8a42f8ec29
RDX: 000000000000003a RSI: 0000000000000003 RDI: 000000000000000a
RBP: 00007f8a43011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8a431d6038 R14: 00007f8a431d5fa0 R15: 00007fffd0c03e38
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g27917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=12804
rcu: rcu_preempt kthread starved for 10505 jiffies! g27917 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>
