bridge0: port 2(bridge_slave_1) entered forwarding state
bridge0: topology change detected, propagating
bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: topology change detected, propagating
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13999
rcu: 	(detected by 1, t=10502 jiffies, g=58873, q=349 ncpus=2)
task:syz.1.2094      state:R  running task     stack:23352 pid:13999 tgid:13998 ppid:12105  task_flags:0x400140 flags:0x0000400a
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g58873 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=30744
rcu: rcu_preempt kthread starved for 10498 jiffies! g58873 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26664 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13999 Comm: syz.1.2094 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_release+0x296/0x3e0
Code: 24 08 48 c7 c7 32 98 ba 8d e8 a6 ef dc 09 b8 ff ff ff ff 65 0f c1 05 49 8d 03 11 83 f8 01 75 51 48 c7 44 24 20 00 00 00 00 9c <8f> 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01
RSP: 0018:ffffc90000007810 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000087 RCX: 61aa7fe5aac0af00
RDX: 0000000000000004 RSI: ffffffff8dba9832 RDI: ffffffff8be33e00
RBP: ffff888020992850 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: 0000000000000004
R13: 0000000000000004 R14: ffff88804b027a98 R15: ffff888020991cc0
FS:  00007f7e58d836c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1a26058fc8 CR3: 000000002f5c8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000082
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0xb61/0x2390
Code: 84 c0 0f 85 85 13 00 00 41 83 3e 00 0f 95 c0 49 39 df 0f 96 c1 20 c1 49 39 dc 0f 97 c0 20 c8 3c 01 75 18 48 8d 43 08 4c 39 f8 <0f> 97 c1 4c 39 e0 0f 96 c0 84 c1 0f 85 c2 00 00 00 49 8d 7e 28 48
RSP: 0018:ffffc90007cc6c78 EFLAGS: 00000202
RAX: ffffc90007cc7780 RBX: ffffc90007cc7778 RCX: 1ffff92000f98d01
RDX: ffffffff90babba6 RSI: 0000000000000002 RDI: ffffffff8be33da0
RBP: 1ffff92000f98daa R08: 0000000000000009 R09: ffffffff8172d195
R10: ffffc90007cc6d98 R11: ffffffff81ac4d00 R12: ffffc90007cc8000
R13: 1ffff92000f98dab R14: ffffc90007cc6d48 R15: ffffc90007cc0000
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 nf_hook_slow+0x1b4/0x220
 nf_hook_slow_list+0x1c7/0x390
 ip6_sublist_rcv+0xccf/0xdd0
 ipv6_list_rcv+0x3e5/0x430
 __netif_receive_skb_list_core+0x5f4/0x800
 netif_receive_skb_list_internal+0x975/0xcc0
 netif_receive_skb_list+0x54/0x450
 bpf_test_run_xdp_live+0x1786/0x1b10
 bpf_prog_test_run_xdp+0x713/0x1000
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x581/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e57f8eba9
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:00007f7e58d83038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7e581d5fa0 RCX: 00007f7e57f8eba9
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f7e58011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7e581d6038 R14: 00007f7e581d5fa0 R15: 00007ffc195508f8
 </TASK>
