rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10306 ticks this GP) idle=4574/1/0x4000000000000000 softirq=94840/94846 fqs=5051
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1352600          0            0
rcu: 	cputime:    31419      21070           69   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=90497 q=14972 ncpus=2)
CPU: 1 UID: 0 PID: 20178 Comm: syz.4.3629 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:debug_smp_processor_id+0x4/0x20
Code: 4c 89 f6 e8 fe 66 4f f9 e9 67 ff ff ff cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> c7 c7 a0 6c 07 8c 48 c7 c6 e0 6c 07 8c eb 1c 66 66 66 2e 0f 1f
RSP: 0018:ffffc90000a08098 EFLAGS: 00000203
RAX: 0000000000000001 RBX: ffffffff8b8dc1cd RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e560120
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000a08258 R11: ffffffff81af6830 R12: 0000000000000002
R13: ffffffff8e560120 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0f82e4f6c0(0000) GS:ffff8882a96a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f876d5456b8 CR3: 000000016f2f6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x57/0x2e0
 unwind_next_frame+0xc2/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 __kfence_alloc+0x2ed/0x3e0
 __kmalloc_cache_noprof+0x51e/0x660
 ref_tracker_alloc+0x161/0x4d0
 ___neigh_create+0xcab/0x2290
 ip6_finish_output2+0x1038/0x1360
 ip6_output+0x340/0x550
 ndisc_send_skb+0xbaa/0x14e0
 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:trace_sched_exit_tp+0x0/0x150
Code: 03 38 c1 0f 8c 83 fe ff ff 48 8b 7d b0 e8 78 34 98 00 e9 75 fe ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 53 66 90 65 8b 05 75 a8 63 11 83 f8 08 73 36 89 c3
RSP: 0018:ffffc900096d77d8 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff88816c300000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dcf1fb8 RDI: 0000000000000001
RBP: ffffc900096d79d8 R08: ffffffff8ff0e0b7 R09: 1ffffffff1fe1c16
R10: dffffc0000000000 R11: fffffbfff1fe1c17 R12: dffffc0000000000
R13: ffff88816970d700 R14: ffff88823c63add8 R15: ffff88816c3015bc
 __schedule+0x1554/0x5070
 schedule+0x164/0x360
 __futex_wait+0x1ee/0x420
 futex_wait+0x119/0x380
 do_futex+0x333/0x420
 __se_sys_futex+0x3a8/0x450
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0f81f9acb9
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:00007f0f82e4f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f0f82216188 RCX: 00007f0f81f9acb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0f82216188
RBP: 00007f0f82216180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0f82216218 R14: 00007ffe0429ef10 R15: 00007ffe0429eff8
 </TASK>
sched: DL replenish lagged too much
