rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=ff5c/1/0x4000000000000000 softirq=16833/16842 fqs=5028
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1065165          0            0
rcu: 	cputime:    30388      22091           93   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=10801 q=2560 ncpus=2)
CPU: 0 UID: 0 PID: 6532 Comm: syz.1.175 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:ipv6_get_ifaddr+0x32e/0x790
Code: e9 e5 02 00 00 31 ff 8b 74 24 04 e8 cc 06 94 f7 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 06 77 f7 f7 49 8b 5d 00 <48> 8b 44 24 38 42 80 3c 38 00 74 08 4c 89 e7 e8 ee 76 f7 f7 4d 8b
RSP: 0018:ffffc90000007980 EFLAGS: 00000246
RAX: 1ffff11003f40900 RBX: 00000000000080fe RCX: 0000000000000100
RDX: ffff88812f035640 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000007a58 R08: 0000000000000000 R09: ffffffff8a2ba89a
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffffc90000007b20
R13: ffff88801fa04800 R14: 0000000000000001 R15: dffffc0000000000
FS:  00007fd295ac66c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32519ff8 CR3: 0000000029c62000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ndisc_send_rs+0x98/0x630
 addrconf_rs_timer+0x369/0x670
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 fb 98 15 f6 e8 36 f3 4c f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900065263e0 EFLAGS: 00000282
RAX: d452cb711fa5b400 RBX: 0000000000000000 RCX: d452cb711fa5b400
RDX: 0000000000000006 RSI: ffffffff8d9b6a0a RDI: 0000000000000001
RBP: ffffc90006526480 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000ca4c7c
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__timer_delete_sync+0x190/0x2d0
Code: 9a 12 00 49 89 dc 4d 85 f6 48 bb 00 00 00 00 00 fc ff df 75 07 e8 e0 9a 12 00 eb 06 e8 d9 9a 12 00 fb 65 44 8b 35 b0 2e f3 10 <44> 89 f6 81 e6 00 00 0f 00 31 ff e8 00 9f 12 00 41 81 e6 00 00 0f
RSP: 0018:ffffc90006526540 EFLAGS: 00000287
RAX: ffffffff81ad1177 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90003ea3000 RSI: 0000000000003321 RDI: 0000000000003322
RBP: ffffc90006526620 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffff88802a601b28
R13: 1ffff92000ca4cac R14: 0000000080000000 R15: 0000000000000000
 ieee80211_ibss_leave+0x105/0x150
 cfg80211_leave_ibss+0x1e7/0x410
 cfg80211_netdev_notifier_call+0x1b3/0x1450
 notifier_call_chain+0x1b6/0x3e0
 __dev_close_many+0x106/0x6f0
 __dev_change_flags+0x2c7/0x6d0
 netif_change_flags+0x88/0x1a0
 do_setlink+0xc55/0x41c0
 rtnl_newlink+0x160b/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd294b8ebe9
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:00007fd295ac6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd294db5fa0 RCX: 00007fd294b8ebe9
RDX: 0000000000000000 RSI: 0000200000000600 RDI: 0000000000000004
RBP: 00007fd294c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd294db6038 R14: 00007fd294db5fa0 R15: 00007ffd8fdd6e28
 </TASK>
