rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=78d4/1/0x4000000000000000 softirq=44239/44239 fqs=5070
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1260002          0            0
rcu: 	cputime:    29699      22790           76   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=32157 q=2375 ncpus=2)
CPU: 0 UID: 0 PID: 9640 Comm: syz.3.979 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:kfence_guarded_alloc+0x5bc/0xc70
Code: 51 ff 49 89 c6 49 c1 ee 06 49 83 e6 c0 4e 8d 2c 33 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ef e8 0a cb ff ff 4d 8b 65 00 4c 89 e6 48 83 e6 01 31
RSP: 0018:ffffc90000007580 EFLAGS: 00000246
RAX: 1ffffd40009b2211 RBX: ffffea0000000000 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007690 R08: ffffffff99b2b127 R09: 1ffffffff3365624
R10: dffffc0000000000 R11: fffffbfff3365625 R12: 0000000043d5eee8
R13: ffffea0004d91088 R14: 0000000004d91080 R15: ffff88813fed1968
FS:  00007f58b72bf6c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000291ea000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __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: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 df 76 ec 09 e8 8a 41 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000259f7d8 EFLAGS: 00000286
RAX: c3897a95435f8900 RBX: 0000000000000000 RCX: c3897a95435f8900
RDX: 0000000000000006 RSI: ffffffff8d9b9fdf RDI: ffffffff8be33c00
RBP: ffffc9000259f830 R08: ffffffff8fa38f37 R09: 1ffffffff1f471e6
R10: dffffc0000000000 R11: fffffbfff1f471e7 R12: ffff8881072dd640
R13: dffffc0000000000 R14: ffff888020221cc0 R15: ffff88804b03ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 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+0x1064/0x1430
 __se_sys_ioctl+0x82/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f58b638eba9
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:00007f58b72bf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f58b65d5fa0 RCX: 00007f58b638eba9
RDX: 00002000000006c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f58b6411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58b65d6038 R14: 00007f58b65d5fa0 R15: 00007ffc890bea18
 </TASK>
sched: DL replenish lagged too much
