rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=80069, q=388 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295005955-4294995455), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g80069 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=30954
rcu: rcu_preempt kthread starved for 10500 jiffies! g80069 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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 stack:26856 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 18187 Comm: syz.6.3224 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:hrtimer_try_to_cancel+0x3b3/0x420
Code: 10 42 80 3c 30 00 74 08 4c 89 e7 e8 f7 95 75 00 49 8b 1c 24 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 dd 95 75 00 <48> 8b 3b 4c 89 fe e8 f2 44 cf 09 89 e8 48 83 c4 30 5b 41 5c 41 5d
RSP: 0018:ffffc900001e0928 EFLAGS: 00000046
RAX: 1ffff11026cc4f60 RBX: ffff888136627b00 RCX: ffff888020a2d640
RDX: 0000000000010000 RSI: 0000000000000004 RDI: ffffc900001e0800
RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c100 R12: ffff88803bf80198
R13: ffff888136627b00 R14: dffffc0000000000 R15: 0000000000000802
FS:  00007f6fc55b76c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3121fff8 CR3: 000000003bc2a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:lock_is_held_type+0x137/0x190
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 f9 73 26 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90008d2fcc0 EFLAGS: 00000206
RAX: 10db9c8174abf200 RBX: 0000000000000001 RCX: 10db9c8174abf200
RDX: ffff888020a2d640 RSI: ffffffff8dba9832 RDI: ffffffff8be33e00
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff8959df6f
R10: dffffc0000000000 R11: ffffed1024c42054 R12: 0000000000000246
R13: ffff888020a2d640 R14: ffffffff8e13a120 R15: 0000000000000000
 sock_update_netprioidx+0x1d1/0x3a0
 sk_alloc+0x246/0x370
 inet6_create+0x7f0/0x1260
 __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: 0033:0x7f6fc478eba9
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:00007f6fc55b7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f6fc49d6090 RCX: 00007f6fc478eba9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 000000000000000a
RBP: 00007f6fc4811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6fc49d6128 R14: 00007f6fc49d6090 R15: 00007ffc62ce77b8
 </TASK>
