rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=ae44/1/0x4000000000000000 softirq=14675/14687 fqs=4955
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1363260          0            0
rcu: 	cputime:    21562      30927           68   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=11713 q=5973 ncpus=2)
CPU: 0 UID: 0 PID: 6300 Comm: syz.1.143 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:unwind_next_frame+0xdd5/0x2550
Code: 61 03 ba 00 48 89 5c 24 60 4c 89 64 24 18 49 8d 5c 24 f8 4d 8b 66 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 <84> c0 0f 85 2c 12 00 00 41 83 3e 00 0f 95 c0 49 39 df 0f 96 c1 20
RSP: 0018:ffffc90000007378 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000007538 RCX: 1ffff92000000e95
RDX: ffffffff90c422ee RSI: 0000000000000002 RDI: ffffffff8c28b080
RBP: 1ffff92000000e96 R08: 0000000000000001 R09: ffffffff8e95cd60
R10: ffffc900000074f8 R11: fffff52000000ea1 R12: ffffc90000008000
R13: 1ffff92000000e97 R14: ffffc900000074a8 R15: ffffc90000000000
FS:  00007f96c6ff66c0(0000) GS:ffff88818dc89000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a13ff8 CR3: 0000000109dfc000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __unwind_start+0x5b8/0x760
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 __kfence_alloc+0x2ed/0x3e0
 __kmalloc_cache_noprof+0x51e/0x660
 dst_cow_metrics_generic+0x56/0x1c0
 icmp6_dst_alloc+0x265/0x440
 ndisc_send_skb+0x44a/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:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 83 dc e9 f5 e8 de f2 23 f6 fb bf 01 00 00 00 <e8> 53 a2 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 a4 f4 23 f6 bf 01
RSP: 0018:ffffc9000693fad0 EFLAGS: 00000206
RAX: 00000000000008a5 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8dfaa584 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9030b8f7 R09: 1ffffffff206171e
R10: dffffc0000000000 R11: fffffbfff206171f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x14f/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:mutex_unlock+0x0/0x10
Code: 24 18 e8 93 d3 86 f6 e9 d9 fe ff ff 31 ff e8 17 a4 e9 f5 e9 e8 fd ff ff cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 34 24 eb 16 66 0f 1f 44 00 00 90 90 90 90 90 90
RSP: 0018:ffffc9000693fbf8 EFLAGS: 00000282
RAX: ffffffff81fe4df8 RBX: ffff88816940f400 RCX: 0000000000080000
RDX: ffffc9000b26b000 RSI: 000000000000053d RDI: ffff88816940f440
RBP: ffffc9000693fea8 R08: ffff88816ba2c35f R09: 1ffff1102d74586b
R10: dffffc0000000000 R11: ffffed102d74586c R12: ffff8881154d5d48
R13: fffff52000d27f94 R14: dffffc0000000000 R15: 0000000000000000
 perf_ioctl+0x18e/0x20c0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96c8d9cdd9
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:00007f96c6ff6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f96c9016090 RCX: 00007f96c8d9cdd9
RDX: 000000000000000b RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007f96c8e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f96c9016128 R14: 00007f96c9016090 R15: 00007ffd8a2a0458
 </TASK>
sched: DL replenish lagged too much
