bridge0: port 3(syz_tun) entered learning state
bridge0: port 3(syz_tun) entered forwarding state
bridge0: topology change detected, propagating
------------[ cut here ]------------
1
WARNING: kernel/rcu/tree_stall.h:1048 at rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1048, CPU#0: kworker/u9:2/5626
Modules linked in:
CPU: 0 UID: 0 PID: 5626 Comm: kworker/u9:2 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue:  0x0 (hci6)
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1048
Code: ff ff 48 c7 c7 e0 b6 7c 9a be 04 00 00 00 e8 23 2f 88 00 4c 89 f7 b8 01 00 00 00 87 05 25 37 d0 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 f8 b5 8e 74 47 48 c7 c0 40 cc 57 90 48 c1 e8
RSP: 0018:ffffc90000007d98 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff81ac7fad
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8eb5f800
RBP: ffffc90000007f20 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff34f96dc R12: 0000000000002904
R13: dffffc0000000000 R14: ffffffff8eb5f800 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124f4d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000005997e000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_core+0x414/0x10a0 kernel/rcu/tree.c:2892
 handle_softirqs+0x225/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:finish_task_switch+0x417/0xc60 kernel/sched/core.c:5361
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 f3 ab 3e 0a e8 de ac 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:ffffc900043a7a60 EFLAGS: 00000206
RAX: 00000000000133eb RBX: ffff8880b863bf20 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e22e3c6 RDI: ffffffff8c4bdd80
RBP: ffffc900043a7ab0 R08: ffffffff90579937 R09: 1ffffffff20af326
R10: dffffc0000000000 R11: fffffbfff20af327 R12: ffff888021743e00
R13: ffff8880b863bee8 R14: dffffc0000000000 R15: 1ffff110170c77e4
 context_switch kernel/sched/core.c:5513 [inline]
 __schedule+0x17e1/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 worker_thread+0xc12/0xfb0 kernel/workqueue.c:3501
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	41 c7 84 24 20 0e 00 	movl   $0x0,0xe20(%r12)
   9:	00 00 00 00 00
   e:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  13:	49 83 c4 48          	add    $0x48,%r12
  17:	4c 89 e7             	mov    %r12,%rdi
  1a:	e8 f3 ab 3e 0a       	call   0xa3eac12
  1f:	e8 de ac 39 00       	call   0x39ad02
  24:	fb                   	sti
  25:	4c 8b 65 c8          	mov    -0x38(%rbp),%r12
* 29:	49 8d bc 24 f8 16 00 	lea    0x16f8(%r12),%rdi <-- trapping instruction
  30:	00
  31:	48 89 f8             	mov    %rdi,%rax
  34:	48 c1 e8 03          	shr    $0x3,%rax
  38:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
  3d:	84 c0                	test   %al,%al