rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=9d24/1/0x4000000000000000 softirq=164449/164450 fqs=5162
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   939124          0            0
rcu: 	cputime:    33759      18730           55   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=143597 q=7710 ncpus=2)
CPU: 1 UID: 0 PID: 3788 Comm: syz.9.8038 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+0x223/0x23c0
Code: 86 78 04 00 00 44 89 f8 4c 8d 2c 85 60 80 52 91 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 48 89 eb 0f 85 25 1c 00 00 45 8b 6d 00 <44> 89 f8 ff c0 48 8d 2c 85 60 80 52 91 48 89 e8 48 c1 e8 03 0f b6
RSP: 0018:ffffc90000a083d8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000300
RDX: 00000000000ab1bc RSI: ffffffff8c27b3e0 RDI: ffffffff8c27b3a0
RBP: dffffc0000000000 R08: ffffffff81767de5 R09: ffffffff8e75e3e0
R10: ffffc90000a084f8 R11: ffffffff81b0bfa0 R12: ffffffff8981416e
R13: 000000000017fb58 R14: ffffc90000a084a8 R15: 0000000000088141
FS:  00007f4e3c58b6c0(0000) GS:ffff8882a9463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4e399d4ff8 CR3: 0000000175dc8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000f0602
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 ref_tracker_free+0x11e/0x840
 neigh_destroy+0x34f/0x5c0
 neigh_remove_one+0x46d/0x4c0
 ___neigh_create+0x485/0x2280
 ip6_finish_output2+0x729/0x13e0
 ip6_output+0x340/0x550
 ndisc_send_skb+0xd0b/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 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+0x245/0x920
Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 85 99 1b 0a e8 b0 8e 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 70 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900033d7118 EFLAGS: 00000202
RAX: 000000000000177f RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8def4b7d RDI: ffffffff8c27b400
RBP: ffffc900033d7170 R08: ffffffff90118bb7 R09: 1ffffffff2023176
R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff888170c6d7c0
R13: dffffc0000000000 R14: ffff88811869d7c0 R15: ffff88823c63b918
 __schedule+0x15e5/0x52d0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x599/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:should_failslab+0x93/0x100
Code: 48 c1 e9 03 42 0f b6 0c 21 84 c9 75 62 41 f6 47 01 40 74 37 c1 eb 0d 83 e3 01 49 83 c6 1c 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 <84> c0 75 2a 41 8b 36 48 c7 c7 20 03 8a 8e 89 da e8 58 71 b8 02 31
RSP: 0018:ffffc900033d74b0 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000000000000 RSI: 0000000000000d40 RDI: ffff888100041780
RBP: 0000000000000d40 R08: ffffffff82216b5c R09: ffffffff8e897ae0
R10: ffff8881b662efe9 R11: 0000000000000fe9 R12: dffffc0000000000
R13: 0000000000000014 R14: ffff88810004179c R15: 0000000000000005
 __kmalloc_noprof+0xe8/0x760
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_check_open_permission+0x229/0x470
 security_file_open+0xa9/0x240
 do_dentry_open+0x384/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e3b79c799
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:00007f4e3c58b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4e3ba15fa0 RCX: 00007f4e3b79c799
RDX: 0000000000020000 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f4e3b832c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e3ba16038 R14: 00007f4e3ba15fa0 R15: 00007ffef8fad188
 </TASK>
sched: DL replenish lagged too much
