rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10493 ticks this GP) idle=497c/1/0x4000000000000000 softirq=18041/18041 fqs=5201
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   922746          0            0
rcu: 	cputime:    35920      16558           49   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=11893 q=3034 ncpus=2)
CPU: 0 UID: 0 PID: 7201 Comm: syz.0.573 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:__kmalloc_cache_noprof+0x105/0x6f0
Code: 01 00 00 bf 01 00 00 00 e8 28 16 75 ff 65 8b 05 31 a2 53 10 85 c0 0f 84 57 03 00 00 48 c7 44 24 28 00 00 00 00 4c 8b 74 24 08 <41> b8 ff ff ff ff 65 48 8b 05 05 a2 53 10 49 8b 0f 4c 8b 64 08 08
RSP: 0018:ffffc900000077e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000060 RDI: ffffffff8e0608e0
RBP: 0000000000000820 R08: 00000000000002ff R09: 0200000000000000
R10: 00000000000002ff R11: ffffffff892c3930 R12: ffff88811cba2300
R13: ffffc900000079d0 R14: 0000000000000048 R15: ffff888100041280
FS:  00007f49753e56c0(0000) GS:ffff88818eb38000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d371e1b90 CR3: 0000000111a8a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602
Call Trace:
 <IRQ>
 dst_cow_metrics_generic+0x56/0x1c0
 icmp6_dst_alloc+0x264/0x420
 ndisc_send_skb+0x3f1/0x1510
 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: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 ef 79 b8 09 e8 5a b9 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 58 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003c87578 EFLAGS: 00000286
RAX: 034c2edfb91c9000 RBX: 0000000000000000 RCX: 034c2edfb91c9000
RDX: 0000000000000007 RSI: ffffffff8d70f100 RDI: ffffffff8bbf0e60
RBP: ffffc90003c875d0 R08: ffffffff8f7cf077 R09: 1ffffffff1ef9e0e
R10: dffffc0000000000 R11: fffffbfff1ef9e0f R12: ffff88811de79d00
R13: dffffc0000000000 R14: ffff88811e0a0000 R15: ffff88812123ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:qlist_free_all+0x6d/0x140
Code: 4c 04 08 f6 c1 01 75 53 49 01 c4 0f 1f 44 00 00 41 0f b6 44 24 33 c1 e0 18 3d 00 00 00 f5 4d 0f 45 e5 4d 8b 64 24 08 49 8b 2f <49> 63 84 24 d8 00 00 00 49 29 c7 4c 89 e7 4c 89 fe e8 3d e3 ff ff
RSP: 0018:ffffc90003c87970 EFLAGS: 00000246
RAX: 00000000f5000000 RBX: ffffc90003c879a8 RCX: ffffea00044ce200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888115ada000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ef9e0f R12: ffff88816040b640
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88811338a200
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x367/0x6e0
 taskstats_exit+0x14a/0xa30
 do_exit+0x630/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1285/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 exit_to_user_mode_loop+0x72/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f497458f749
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:00007f49753e5038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000004 RBX: 00007f49747e5fa0 RCX: 00007f497458f749
RDX: ffefffffffffffff RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f4974613f91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f49747e6038 R14: 00007f49747e5fa0 R15: 00007ffe48926e18
 </TASK>
sched: DL replenish lagged too much
