rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=d29c/1/0x4000000000000000 softirq=27653/27658 fqs=4839
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1082623          0            0
rcu: 	cputime:    22238      30251           88   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=24701 q=3822 ncpus=2)
CPU: 0 UID: 0 PID: 8563 Comm: syz.2.1118 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:deref_stack_reg+0x9d/0x220
Code: 00 00 00 fc ff df 4d 8b 77 10 4c 89 fb 48 c1 eb 03 0f b6 04 33 84 c0 0f 85 39 01 00 00 41 83 3f 00 0f 95 c0 4c 39 c5 0f 96 c1 <20> c1 4d 39 c6 0f 97 c0 20 c8 3c 01 75 18 49 8d 40 08 48 39 e8 0f
RSP: 0018:ffffc90000007598 EFLAGS: 00000283
RAX: 0000000000000001 RBX: 1ffff92000000ed1 RCX: 0000000000000001
RDX: ffffc900000076c8 RSI: dffffc0000000000 RDI: ffffc90000007698
RBP: ffffc90000000000 R08: ffffc90000007b90 R09: 0000000000000000
R10: ffffc900000076d8 R11: fffff52000000edd R12: 1ffff92000000ed2
R13: 1ffff92000000ed3 R14: ffffc90000008000 R15: ffffc90000007688
FS:  00007f98dbbf66c0(0000) GS:ffff88818d950000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6c0b842820 CR3: 00000001bb456000 CR4: 00000000000006f0
DR0: 0100000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x19bd/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x355/0x610
 __alloc_skb+0x1d7/0x7a0
 ndisc_alloc_skb+0xa0/0x480
 ndisc_send_rs+0x288/0x6b0
 addrconf_rs_timer+0x2d2/0x6c0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x225/0x840
 __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:finish_task_switch+0x417/0xc60
Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 63 ea 3d 0a e8 8e a9 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc900038ff620 EFLAGS: 00000206
RAX: 00000000005de32b RBX: ffff88812103bf20 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e22c4de RDI: ffffffff8c4bdc80
RBP: ffffc900038ff670 R08: ffffffff90578d37 R09: 1ffffffff20af1a6
R10: dffffc0000000000 R11: fffffbfff20af1a7 R12: ffff8881a3161dc0
R13: ffff8881a3161dc0 R14: dffffc0000000000 R15: 1ffff110242077e4
 __schedule+0x17e1/0x56c0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x45/0x70
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 17 00 00 00 74 2c 8b 91 f8 16 00 00 83 fa 02 75 21 48 8b 91 00 17 00 00 48 8b 32 <48> 8d 7e 01 8b 89 fc 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc900038ff998 EFLAGS: 00000246
RAX: ffffffff81ba8e86 RBX: ffffc900038ffae8 RCX: ffff8881a3161dc0
RDX: ffffc90021c08000 RSI: 0000000000000077 RDI: 00000000ffffffff
RBP: 0000000000000001 R08: ffff888119b2e34b R09: 1ffff11023365c69
R10: dffffc0000000000 R11: ffffed1023365c6a R12: dffffc0000000000
R13: ffffc900038ffaa0 R14: 0000000000000000 R15: ffff888119b2e000
 futex_wait_setup+0x446/0x590
 __futex_wait+0x15f/0x400
 futex_wait+0x121/0x390
 do_futex+0x3e7/0x4e0
 __se_sys_futex+0x3a8/0x450
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98dd99de99
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:00007f98dbbf60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f98ddc26098 RCX: 00007f98dd99de99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f98ddc26098
RBP: 00007f98ddc26090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98ddc26128 R14: 00007fffad4d2750 R15: 00007fffad4d2838
 </TASK>
sched: DL replenish lagged too much
