rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=387c/1/0x4000000000000000 softirq=45957/45963 fqs=4095
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1261193          0            0
rcu: 	cputime:    31822      20656           73   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=43025 q=3618 ncpus=2)
CPU: 0 UID: 0 PID: 13497 Comm: syz.0.2371 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e #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:read_seqbegin+0x1e0/0x250
Code: 04 2c 00 00 00 00 66 43 c7 44 2c 09 00 00 43 c6 44 2c 0b 00 65 48 8b 05 1e 09 45 09 48 3b 44 24 60 75 2d 44 89 f0 48 8d 65 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 81 5c 16 02 cc 89 d9 80 e1 07 80
RSP: 0018:ffffc900000076a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880264db148 RCX: ffff8881075f3980
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000076c8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 1ffff92000000ec4
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11004c9b629
FS:  00007f38d8fc36c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcdb8259897 CR3: 000000012bd74000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 neigh_connected_output+0x1ea/0x460
 ip6_finish_output2+0x11fe/0x16a0
 ndisc_send_skb+0xb47/0x1400
 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 0f 1a df 09 e8 ba b9 35 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:ffffc90003f7f618 EFLAGS: 00000286
RAX: 422b116b79a4eb00 RBX: 0000000000000000 RCX: 422b116b79a4eb00
RDX: 0000000000000000 RSI: ffffffff8d998836 RDI: ffffffff8be29f40
RBP: ffffc90003f7f670 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff8881075f3980
R13: dffffc0000000000 R14: ffff8880202e9cc0 R15: ffff88804b03ab98
 __schedule+0x16fd/0x4d00
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:memcpy_orig+0x58/0x130
Code: 4f 08 4c 89 57 10 4c 89 5f 18 48 8d 7f 20 73 d4 83 c2 20 eb 44 48 01 d6 48 01 d7 48 83 ea 20 0f 1f 00 48 83 ea 20 4c 8b 46 f8 <4c> 8b 4e f0 4c 8b 56 e8 4c 8b 5e e0 48 8d 76 e0 4c 89 47 f8 4c 89
RSP: 0018:ffffc90003f7fa18 EFLAGS: 00000206
RAX: ffffc90003f7faa0 RBX: 0000000000000000 RCX: ffffffff81b46a43
RDX: 0000000000000048 RSI: ffffffff8b8d5f08 RDI: ffffc90003f7fb28
RBP: ffffc90003f7fbd0 R08: 0000000000000000 R09: 1ffff920007eff64
R10: dffffc0000000000 R11: fffff520007eff65 R12: dffffc0000000000
R13: ffffc90003f7faa0 R14: 00000000ffffffff R15: 1ffff920007eff50
 __futex_wait+0xb3/0x3e0
 futex_wait+0x104/0x360
 do_futex+0x333/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f38d818e9a9
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:00007f38d8fc30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f38d83b5fa8 RCX: 00007f38d818e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f38d83b5fa8
RBP: 00007f38d83b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f38d83b5fac
R13: 0000000000000000 R14: 00007ffd2dddea20 R15: 00007ffd2dddeb08
 </TASK>
