rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (5760 ticks this GP) idle=12cc/1/0x4000000000000000 softirq=21846/21853 fqs=1637
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1043800         42            0
rcu: 	cputime:    32165      20161           92   ==> 52330(ms)
rcu: 	(t=10500 jiffies g=9817 q=46490 ncpus=2)
CPU: 1 UID: 0 PID: 6942 Comm: syz.3.404 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:addrconf_rs_timer+0x1fc/0x670 net/ipv6/addrconf.c:4032
Code: 84 f6 0f 84 b7 00 00 00 48 8d 8b 04 ff ff ff 48 89 c8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 48 89 44 24 30 42 0f b6 04 30 <84> c0 48 89 4c 24 18 0f 85 f3 02 00 00 44 8b a3 04 ff ff ff 48 8d
RSP: 0018:ffffc900001e0ac0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffff8880366fe708 RCX: ffff8880366fe60c
RDX: ffff8881079b1cc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0b90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c148 R12: 0000000000000000
R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff11006cdfc00
FS:  00007f58545fe6c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555942245c8 CR3: 000000010eb04000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 4b 87 4b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 93 2e 14 f6 65 8b 05 6c 71 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900035c7a60 EFLAGS: 00000206
RAX: 636fdbb2ef593b00 RBX: 0000000000000a02 RCX: 636fdbb2ef593b00
RDX: 0000000000000000 RSI: ffffffff8d9b6a0a RDI: 0000000000000001
RBP: ffffc900035c7af0 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: dffffc0000000000
R13: ffffc900035c7b20 R14: ffff88801dc47340 R15: 1ffff920006b8f4c
 rwsem_wake+0xe4/0x140 kernel/locking/rwsem.c:1224
 __up_write kernel/locking/rwsem.c:1387 [inline]
 up_write+0x1eb/0x420 kernel/locking/rwsem.c:1643
 inode_unlock include/linux/fs.h:879 [inline]
 perf_fasync+0xcd/0x110 kernel/events/core.c:7189
 ioctl_fioasync fs/ioctl.c:379 [inline]
 do_vfs_ioctl+0x1064/0x1430 fs/ioctl.c:512
 __do_sys_ioctl fs/ioctl.c:596 [inline]
 __se_sys_ioctl+0x82/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5854f8ebe9
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:00007f58545fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f58551b5fa0 RCX: 00007f5854f8ebe9
RDX: 00002000000006c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f5855011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58551b6038 R14: 00007f58551b5fa0 R15: 00007ffed4e4caf8
 </TASK>
