syzbot

veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
Oops: general protection fault, probably for non-canonical address 0xdffffc001fff41ac: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x00000000fffa0d60-0x00000000fffa0d67]
CPU: 0 UID: 0 PID: 8379 Comm: kworker/u8:17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline]
RIP: 0010:__ip_mc_dec_group+0x25a/0x5b0 net/ipv4/igmp.c:1774
Code: cc ed 0d f8 69 43 08 47 86 c8 61 49 bd 00 00 00 00 00 fc ff df c1 e8 17 4d 8d 24 c4 eb 2d e8 0d 8d a8 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1e 03 00 00 4d 8b 34 24 4c 39 f3 0f 84 ef 00
RSP: 0018:ffffc9000ba67620 EFLAGS: 00010216
RAX: 000000001fff41ac RBX: ffff88807c235c00 RCX: ffffffff8a1303c1
RDX: ffff88804f908000 RSI: ffffffff8a130383 RDI: 0000000000000005
RBP: ffff8880779ce420 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000002c10 R12: 00000000fffa0d60
R13: dffffc0000000000 R14: 0000000000000000 R15: 00000000010000e0
FS:  0000000000000000(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffd CR3: 0000000033e3a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 inetdev_event+0x3b2/0x18a0 net/ipv4/devinet.c:1642
 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 netif_close_many+0x319/0x630 net/core/dev.c:1784
 unregister_netdevice_many_notify+0x563/0x24c0 net/core/dev.c:12124
 unregister_netdevice_many net/core/dev.c:12217 [inline]
 default_device_exit_batch+0x853/0xaf0 net/core/dev.c:12721
 ops_exit_list net/core/net_namespace.c:204 [inline]
 ops_undo_list+0x363/0xab0 net/core/net_namespace.c:251
 cleanup_net+0x408/0x890 net/core/net_namespace.c:682
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline]
RIP: 0010:__ip_mc_dec_group+0x25a/0x5b0 net/ipv4/igmp.c:1774
Code: cc ed 0d f8 69 43 08 47 86 c8 61 49 bd 00 00 00 00 00 fc ff df c1 e8 17 4d 8d 24 c4 eb 2d e8 0d 8d a8 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1e 03 00 00 4d 8b 34 24 4c 39 f3 0f 84 ef 00
RSP: 0018:ffffc9000ba67620 EFLAGS: 00010216
RAX: 000000001fff41ac RBX: ffff88807c235c00 RCX: ffffffff8a1303c1
RDX: ffff88804f908000 RSI: ffffffff8a130383 RDI: 0000000000000005
RBP: ffff8880779ce420 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000002c10 R12: 00000000fffa0d60
R13: dffffc0000000000 R14: 0000000000000000 R15: 00000000010000e0
FS:  0000000000000000(0000) GS:ffff8881247bd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffd CR3: 000000004251a000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	f8                   	clc
   1:	69 43 08 47 86 c8 61 	imul   $0x61c88647,0x8(%rbx),%eax
   8:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
   f:	fc ff df
  12:	c1 e8 17             	shr    $0x17,%eax
  15:	4d 8d 24 c4          	lea    (%r12,%rax,8),%r12
  19:	eb 2d                	jmp    0x48
  1b:	e8 0d 8d a8 f7       	call   0xf7a88d2d
  20:	4c 89 e0             	mov    %r12,%rax
  23:	48 c1 e8 03          	shr    $0x3,%rax
* 27:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2c:	0f 85 1e 03 00 00    	jne    0x350
  32:	4d 8b 34 24          	mov    (%r12),%r14
  36:	4c 39 f3             	cmp    %r14,%rbx
  39:	0f                   	.byte 0xf
  3a:	84 ef                	test   %ch,%bh