rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=f5bc/1/0x4000000000000000 softirq=64421/64426 fqs=5225
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1223510          0            0
rcu: 	cputime:    32142      20357           78   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=59933 q=2892 ncpus=2)
CPU: 0 UID: 0 PID: 16459 Comm: syz.0.3090 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:get_random_u8+0x4/0x940
Code: 41 5e 41 5f 5d c3 cc cc cc cc cc e8 36 be 27 06 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 40 01
RSP: 0018:ffffc90000007578 EFLAGS: 00000246
RAX: ffffffff82237248 RBX: 0000000000000820 RCX: ffff888020105640
RDX: 0000000000000100 RSI: 00000000000000f0 RDI: ffff888100a96a00
RBP: ffffc90000007690 R08: 0000000000000015 R09: 00000000ab0fc73e
R10: dffffc0000000000 R11: fffffbfff3365591 R12: 00000000ab0fc73e
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000000ebc
FS:  00007f75883f86c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32420ff8 CR3: 0000000027236000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 kfence_guarded_alloc+0x9d/0xc70
 __kfence_alloc+0x385/0x3b0
 kmem_cache_alloc_node_noprof+0x315/0x3c0
 __alloc_skb+0x112/0x2d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 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:fasync_insert_entry+0x1c8/0x270
Code: 4c 8b 7c 24 08 74 08 4c 89 ff e8 13 35 ea ff 4d 89 37 4c 8d 73 68 4c 89 f0 48 c1 e8 03 0f b6 04 28 84 c0 75 6b 41 80 4e 01 20 <45> 31 e4 48 c7 c7 40 47 28 8e e8 29 df 43 09 48 89 df e8 21 df 43
RSP: 0018:ffffc9000358fb78 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff8880220b4800 RCX: 0000000000000001
RDX: ffffffff99b33fc0 RSI: ffffffff8b9959a0 RDI: ffff8880210550f8
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520006b1f60 R12: ffff8880210550f0
R13: 0000000000000000 R14: ffff8880220b4868 R15: ffff8880441561f8
 fasync_helper+0x52/0xb0
 perf_fasync+0xc3/0x110
 do_vfs_ioctl+0x1064/0x1430
 __se_sys_ioctl+0x82/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f758758eba9
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:00007f75883f8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f75877d5fa0 RCX: 00007f758758eba9
RDX: 00002000000006c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f7587611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f75877d6038 R14: 00007f75877d5fa0 R15: 00007fffd8897258
 </TASK>
sched: DL replenish lagged too much
