clocksource: Long readout interval, skipping watchdog check: cs_nsec: 99935365174 wd_nsec: 99935368100
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=111c/1/0x4000000000000000 softirq=44909/44909 fqs=5003
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1281373          3            0
rcu: 	cputime:    30842      21637           77   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=39717 q=2057 ncpus=2)
CPU: 1 UID: 0 PID: 12313 Comm: syz.1.1927 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:strlen+0x1f/0x70
Code: 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb <49> 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3
RSP: 0000:ffffc900001df738 EFLAGS: 00000206
RAX: 0000000000000004 RBX: ffffffff8b8bd565 RCX: 2cc6f8582a7aca00
RDX: ffffffff8172d195 RSI: ffffffff8e13a160 RDI: ffffffff8b8bd560
RBP: ffffc900001df860 R08: ffffc900001e0108 R09: 0000000000000000
R10: ffffc900001df9f8 R11: fffff5200003bf41 R12: 1ffff9200003bef4
R13: ffffffff8172d195 R14: dffffc0000000000 R15: 0000000000000003
FS:  00007f12c3e566c0(0000) GS:ffff8881a3c11000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c31a400 CR3: 000000010e3e8000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_trace_lock+0xc2/0x3b0
 lock_release+0x3b2/0x3e0
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 skb_ext_add+0x1b6/0x8f0
 br_nf_forward_ip+0xc6/0x7e0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x215/0x3c0
 __br_forward+0x41e/0x600
 maybe_deliver+0xb5/0x160
 br_flood+0x31a/0x6a0
 br_handle_frame_finish+0x14b4/0x19b0
 br_nf_hook_thresh+0x3c6/0x4a0
 br_nf_pre_routing_finish_ipv6+0x948/0xd00
 br_nf_pre_routing_ipv6+0x37e/0x6b0
 br_handle_frame+0x982/0x14c0
 __netif_receive_skb_core+0x10b9/0x4020
 __netif_receive_skb+0x72/0x380
 process_backlog+0x60e/0x14f0
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 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:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 eb ce 13 f6 e8 b6 2b 4b f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0000:ffffc90003a4fdc0 EFLAGS: 00000282
RAX: 2cc6f8582a7aca00 RBX: 0000000000000000 RCX: 2cc6f8582a7aca00
RDX: 0000000000000000 RSI: ffffffff8d9baf3d RDI: 0000000000000001
RBP: ffffc90003a4fe70 R08: ffffffff8fa3b637 R09: 1ffffffff1f476c6
R10: dffffc0000000000 R11: fffffbfff1f476c7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000749fb8
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:irqentry_exit_to_user_mode+0x51/0x120
Code: 07 85 c0 0f 85 c3 00 00 00 e8 cb 38 2f f6 65 4c 8b 34 25 08 f0 a0 92 49 8b 3e f7 c7 1e 30 02 00 74 53 49 89 ff e8 bf 37 2f f6 <4c> 89 f8 a8 18 74 08 e8 03 1b 01 00 4c 89 f8 a9 00 10 00 00 74 0b
RSP: 0000:ffffc90003a4ff38 EFLAGS: 00000286
RAX: 2cc6f8582a7aca00 RBX: ffffc90003a4ff58 RCX: 2cc6f8582a7aca00
RDX: 0000000000000000 RSI: ffffffff8d9baf3d RDI: ffffffff8be34500
RBP: 0000000000000000 R08: ffffffff8fa3b637 R09: 1ffffffff1f476c6
R10: dffffc0000000000 R11: fffffbfff1f476c7 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88810951b980 R15: 0000000000000008
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f12c2f8ec29
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:00007f12c3e56038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f12c31d5fa0 RCX: 00007f12c2f8ec29
RDX: 0000200000000440 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f12c3011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f12c31d6038 R14: 00007f12c31d5fa0 R15: 00007fff3be00998
 </TASK>
