rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=40ec/1/0x4000000000000000 softirq=13489/13490 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1281228          0            0
rcu: 	cputime:     9904      42585           31   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=9773 q=5355 ncpus=2)
CPU: 1 UID: 0 PID: 5829 Comm: syz.2.31 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:memset_orig+0x25/0xb0
Code: 90 90 90 90 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 <74> 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48
RSP: 0018:ffffc90000a081b0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000a082d8 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000a082d8
RBP: dffffc0000000000 R08: ffffc90000a082e7 R09: 0000000000000000
R10: ffffc90000a082d8 R11: fffff5200014105d R12: ffffc90000a08fd0
R13: 1ffff92000141053 R14: ffffc90000a08288 R15: ffffc90000a082d0
FS:  00007ff13ede56c0(0000) GS:ffff8882a9289000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f66293456b8 CR3: 0000000106f96000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xf33/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 __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_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+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 06 7a 16 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:ffffc9000712fb30 EFLAGS: 00000206
RAX: 0000000000000417 RBX: 1ffff110478c7784 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dfaa584 RDI: ffff8881bc6316b0
RBP: ffffc9000712fb90 R08: ffffffff9030b8f7 R09: 1ffffffff206171e
R10: dffffc0000000000 R11: fffffbfff206171f R12: ffff88823c63ae88
R13: ffff8881bc630000 R14: ffff888168a8bb00 R15: dffffc0000000000
 __schedule+0x1829/0x5740
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:do_syscall_64+0xa2/0xf80
Code: 00 00 4c 8b 6d 08 4c 89 ef e8 6a 85 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 0a ac 25 f6 90 90 e8 b3 ab 25 f6 fb 4c 89 7b 08 <4d> 8b 7f 08 41 f6 c7 bf 0f 84 82 00 00 00 41 f6 c7 20 74 12 4c 89
RSP: 0018:ffffc9000712fef0 EFLAGS: 00000206
RAX: 0000000000000405 RBX: ffffc9000712fef0 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8dfaa584 RDI: ffffffff8c28b0e0
RBP: ffffc9000712ff38 R08: ffffffff9030b8f7 R09: 1ffffffff206171e
R10: dffffc0000000000 R11: fffffbfff206171f R12: 00000000000000ca
R13: ffffffff81000130 R14: ffffc9000712ff48 R15: ffff8881bc630000
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff13df9cdd9
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:00007ff13ede50e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff13e215fa8 RCX: 00007ff13df9cdd9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff13e215fac
RBP: 00007ff13e215fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff13e216038 R14: 00007ffdea2e2360 R15: 00007ffdea2e2448
 </TASK>
sched: DL replenish lagged too much
