rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=5e44/1/0x4000000000000000 softirq=51268/51268 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11408
rcu: 	(detected by 0, t=10502 jiffies, g=45061, q=496 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11408 Comm: syz.6.1394 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+0x2e/0x70
Code: 41 57 41 56 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
RSP: 0018:ffffc900001e06f8 EFLAGS: 00000803
RAX: 0000000000000000 RBX: ffffffff8b8cf50d RCX: ffff8881117a8000
RDX: ffffffff81adad5e RSI: ffff888136627a98 RDI: ffffffff8b8cf500
RBP: ffffc900001e0808 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c100 R12: 1ffff9200003c0ec
R13: ffffffff81adad5e R14: dffffc0000000000 R15: 000000000000000c
FS:  00007f0dada6d6c0(0000) GS:ffff8881a3c0f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000118aa0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 9f 90 ec 09 e8 ea 41 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003c5eb38 EFLAGS: 00000282
RAX: 58b3bef98c19da00 RBX: 0000000000000000 RCX: 58b3bef98c19da00
RDX: 0000000000000007 RSI: ffffffff8d9bb5e6 RDI: ffffffff8be34480
RBP: ffffc90003c5eb90 R08: ffffffff8fa3c237 R09: 1ffffffff1f47846
R10: dffffc0000000000 R11: fffffbfff1f47847 R12: ffff8881117a8000
R13: dffffc0000000000 R14: ffff8881117ad640 R15: ffff88813663ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:unwind_next_frame+0x16d/0x2390
Code: d8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 45 1b 00 00 f6 03 03 0f 85 e4 17 00 00 49 8d 5e 35 48 89 d8 48 c1 e8 03 48 89 44 24 28 <0f> b6 04 28 84 c0 0f 85 3c 1b 00 00 4c 89 6c 24 50 4c 89 64 24 20
RSP: 0018:ffffc90003c5ef38 EFLAGS: 00000a03
RAX: 1ffff9200078be07 RBX: ffffc90003c5f03d RCX: 58b3bef98c19da00
RDX: 0000000000000000 RSI: ffffffff8be34460 RDI: ffffffff8be34420
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8172d195
R10: ffffc90003c5f058 R11: ffffffff81ac5140 R12: 1ffff9200078be01
R13: ffffc90003c5f058 R14: ffffc90003c5f008 R15: ffffffff8172d195
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 rtmsg_fib+0xea/0x4c0
 fib_table_insert+0xd64/0x1b50
 fib_magic+0x2c4/0x390
 fib_add_ifaddr+0x144/0x5f0
 fib_inetaddr_event+0x12e/0x190
 notifier_call_chain+0x1b6/0x3e0
 blocking_notifier_call_chain+0x6a/0x90
 __inet_insert_ifa+0xa13/0xbf0
 devinet_ioctl+0x14e8/0x1b50
 inet_ioctl+0x3c0/0x4c0
 sock_do_ioctl+0xdc/0x300
 sock_ioctl+0x576/0x790
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0dacb8ec29
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:00007f0dada6d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0dacdd5fa0 RCX: 00007f0dacb8ec29
RDX: 0000200000000040 RSI: 000000000000891c RDI: 0000000000000009
RBP: 00007f0dacc11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0dacdd6038 R14: 00007f0dacdd5fa0 R15: 00007ffd3307ea98
 </TASK>
task:syz.6.1394      state:R  running task     stack:23736 pid:11408 tgid:11407 ppid:11064  task_flags:0x400140 flags:0x0000400a
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g45061 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=22088
rcu: rcu_preempt kthread starved for 10502 jiffies! g45061 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26664 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>
