rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=169c/1/0x4000000000000000 softirq=39897/39897 fqs=4805
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1186123          0            0
rcu: 	cputime:    17662      34817           78   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=37917 q=8605 ncpus=2)
CPU: 1 UID: 0 PID: 11484 Comm: syz.1.1550 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:call_rcu+0x65c/0x890
Code: c4 49 bc 00 00 00 00 00 fc ff df 7f 47 e8 cc f1 22 00 9c 58 a9 00 02 00 00 75 1f f7 44 24 28 00 02 00 00 74 01 fb 48 83 c4 50 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 45 e2 01 0a cc e8 bf ee fe 09 f7
RSP: 0018:ffffc90000a08668 EFLAGS: 00000282
RAX: 0000000000000002 RBX: ffff88816ad79850 RCX: 0000000000000301
RDX: 0000000000000002 RSI: ffffffff8dfabd2a RDI: ffffffff8c28bae0
RBP: 1ffff110478c77ee R08: ffffffff9030c1f7 R09: 1ffffffff206183e
R10: dffffc0000000000 R11: fffffbfff206183f R12: dffffc0000000000
R13: ffff88823c63bf70 R14: 1ffff110478c77f4 R15: ffff88823c63bfa0
FS:  00007fd6d9ca86c0(0000) GS:ffff8882a9284000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001640 CR3: 000000017383a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __dev_queue_xmit+0x4e5/0x3950
 ip6_output+0x340/0x550
 ndisc_send_skb+0xd0b/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:finish_task_switch+0x427/0xbe0
Code: 41 c7 84 24 e0 0d 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 d6 9e 17 0a e8 61 f7 38 00 fb 49 8d bd b0 16 00 00 <48> 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 7b 03 00 00 41 80
RSP: 0018:ffffc9000390f850 EFLAGS: 00000202
RAX: 0000000000001815 RBX: 1ffff110478c7784 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfabd2a RDI: ffff88816b96ef30
RBP: ffffc9000390f8b0 R08: ffffffff9030c1f7 R09: 1ffffffff206183e
R10: dffffc0000000000 R11: fffffbfff206183f R12: ffff88823c63ae88
R13: ffff88816b96d880 R14: ffff8881ae3c9d80 R15: dffffc0000000000
 __schedule+0x1829/0x5740
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock+0x3f/0x50
 fasync_insert_entry+0x1df/0x270
 fasync_helper+0x52/0xb0
 perf_fasync+0xc3/0x110
 do_vfs_ioctl+0x1117/0x1530
 __se_sys_ioctl+0x82/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6d8d9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd6d9ca8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd6d9015fa0 RCX: 00007fd6d8d9cdd9
RDX: 0000200000000500 RSI: 0000000000005452 RDI: 0000000000000004
RBP: 00007fd6d8e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd6d9016038 R14: 00007fd6d9015fa0 R15: 00007ffd219ea0d8
 </TASK>
sched: DL replenish lagged too much
