rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=e724/1/0x4000000000000000 softirq=29379/29381 fqs=4993
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1286348          0            0
rcu: 	cputime:    33184      19305           78   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=26421 q=2691 ncpus=2)
CPU: 1 UID: 0 PID: 9312 Comm: syz.4.944 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:lock_acquire+0x5f/0x2e0
Code: 00 65 8b 05 27 52 57 11 83 f8 08 0f 83 77 01 00 00 89 c0 48 0f a3 05 90 72 50 0e 73 0d e8 c9 f1 08 00 84 c0 0f 84 bc 01 00 00 <83> 3d da a4 50 0e 00 0f 84 c3 00 00 00 48 8b 74 24 68 4c 89 ef e8
RSP: 0018:ffffc90000a08160 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff822c135e RCX: 0000000000000301
RDX: 0000000000000000 RSI: ffffffff8c076ce0 RDI: ffffffff8c076ca0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000a07f80 R11: ffffffff81af6830 R12: 0000000000000002
R13: ffffffff8e560120 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f8eb179a6c0(0000) GS:ffff8882a96a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 00000001bb308000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xc2/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 __dev_queue_xmit+0x4cb/0x32f0
 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:__mutex_unlock_slowpath+0x775/0x7d0
Code: 36 e0 45 49 c7 04 04 00 00 00 00 49 c7 44 04 08 00 00 00 00 65 48 8b 05 29 12 68 07 48 3b 84 24 c0 00 00 00 75 2d 48 8d 65 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 8c 76 01 00 cc e8 d6 ff a3 f5 eb
RSP: 0018:ffffc90003ca7bc8 EFLAGS: 00000246
RAX: 1b7d547de8a86a00 RBX: ffffc90003ca7b80 RCX: ffffffff8b8fa84d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90003ca7b80
RBP: ffffc90003ca7bf0 R08: ffffc90003ca7b87 R09: 1ffff92000794f70
R10: dffffc0000000000 R11: fffff52000794f71 R12: 1ffff92000794f64
R13: 0000000000000000 R14: ffff88811670e440 R15: 1ffffffff1fe2262
 perf_ioctl+0x18e/0x2000
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8eb099acb9
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:00007f8eb179a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8eb0c15fa0 RCX: 00007f8eb099acb9
RDX: 000000000000000c RSI: 0000000040042408 RDI: 000000000000000a
RBP: 00007f8eb0a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8eb0c16038 R14: 00007f8eb0c15fa0 R15: 00007ffd08bd7a28
 </TASK>
clocksource: Long readout interval, skipping watchdog check: cs_nsec: 101352025200 wd_nsec: 101352026067
sched: DL replenish lagged too much
