syzbot

bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
BUG: spinlock bad magic on CPU#0, kworker/u8:8/5991
Oops: general protection fault, probably for non-canonical address 0xe0001bffe00020b9: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0x0000ffff000105c8-0x0000ffff000105cf]
CPU: 0 UID: 0 PID: 5991 Comm: kworker/u8:8 Not tainted 6.12.0-rc3-syzkaller-00525-gc55228220dd3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
RIP: 0010:task_pid_nr include/linux/pid.h:232 [inline]
RIP: 0010:spin_dump kernel/locking/spinlock_debug.c:64 [inline]
RIP: 0010:spin_bug+0x100/0x1d0 kernel/locking/spinlock_debug.c:78
Code: 08 84 d2 0f 85 db 00 00 00 48 85 ed 44 8b 4b 08 74 7d 48 8d bd c8 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 68 44 8b 85 c8 05 00 00 48 8d 8d
RSP: 0018:ffffc900042277e0 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88805f2b8020 RCX: ffffffff816d4289
RDX: 00001fffe00020b9 RSI: ffffffff816deb86 RDI: 0000ffff000105c8
RBP: 0000ffff00010000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000080000001 R11: 205d313939355420 R12: ffffffff8b6d37e0
R13: ffff888028255a00 R14: ffffc90004227920 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560336815068 CR3: 000000007a8ea000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x225/0x2c0 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162
 down+0x2a/0xa0 kernel/locking/semaphore.c:59
 netpoll_poll_disable+0x79/0x110 net/core/netpoll.c:225
 __dev_close_many+0xd9/0x310 net/core/dev.c:1532
 dev_close_many+0x24c/0x6a0 net/core/dev.c:1585
 unregister_netdevice_many_notify+0x489/0x1e50 net/core/dev.c:11377
 cleanup_net+0x58c/0xb40 net/core/net_namespace.c:621
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:task_pid_nr include/linux/pid.h:232 [inline]
RIP: 0010:spin_dump kernel/locking/spinlock_debug.c:64 [inline]
RIP: 0010:spin_bug+0x100/0x1d0 kernel/locking/spinlock_debug.c:78
Code: 08 84 d2 0f 85 db 00 00 00 48 85 ed 44 8b 4b 08 74 7d 48 8d bd c8 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 68 44 8b 85 c8 05 00 00 48 8d 8d
RSP: 0018:ffffc900042277e0 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88805f2b8020 RCX: ffffffff816d4289
RDX: 00001fffe00020b9 RSI: ffffffff816deb86 RDI: 0000ffff000105c8
RBP: 0000ffff00010000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000080000001 R11: 205d313939355420 R12: ffffffff8b6d37e0
R13: ffff888028255a00 R14: ffffc90004227920 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560336815068 CR3: 000000007a8ea000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	08 84 d2 0f 85 db 00 	or     %al,0xdb850f(%rdx,%rdx,8)
   7:	00 00                	add    %al,(%rax)
   9:	48 85 ed             	test   %rbp,%rbp
   c:	44 8b 4b 08          	mov    0x8(%rbx),%r9d
  10:	74 7d                	je     0x8f
  12:	48 8d bd c8 05 00 00 	lea    0x5c8(%rbp),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 04                	je     0x36
  32:	3c 03                	cmp    $0x3,%al
  34:	7e 68                	jle    0x9e
  36:	44 8b 85 c8 05 00 00 	mov    0x5c8(%rbp),%r8d
  3d:	48                   	rex.W
  3e:	8d                   	.byte 0x8d
  3f:	8d                   	.byte 0x8d