------------[ cut here ]------------
RTNL: assertion failed at net/core/dev.c (9539)
WARNING: net/core/dev.c:9539 at __dev_set_promiscuity+0x530/0x710 net/core/dev.c:9539, CPU#0: syz.4.474/7852
Modules linked in:
CPU: 0 UID: 0 PID: 7852 Comm: syz.4.474 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__dev_set_promiscuity+0x53c/0x710 net/core/dev.c:9539
Code: 41 ff d3 e9 06 fc ff ff e8 51 66 53 f8 e9 fc fb ff ff e8 47 66 53 f8 48 8d 3d 20 66 ae 06 48 c7 c6 e0 c0 db 8c ba 43 25 00 00 <67> 48 0f b9 3a e9 22 fb ff ff e8 25 66 53 f8 48 8b 7c 24 08 48 c7
RSP: 0018:ffffc90004a1f6a0 EFLAGS: 00010287
RAX: ffffffff8970d489 RBX: ffff888057752000 RCX: 0000000000080000
RDX: 0000000000002543 RSI: ffffffff8cdbc0e0 RDI: ffffffff901f3ab0
RBP: 0000000000000000 R08: ffffffff8fbbe7a7 R09: 1ffffffff1f77cf4
R10: dffffc0000000000 R11: fffffbfff1f77cf5 R12: 00000000ffffffff
R13: 0000000000000000 R14: ffff8880577520b0 R15: 1ffff1100aeea416
FS:  00007fb4c61ab6c0(0000) GS:ffff8881254b0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c35b6b3 CR3: 000000002a168000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __dev_set_rx_mode+0x17c/0x260 net/core/dev.c:-1
 __dev_mc_add net/core/dev_addr_lists.c:872 [inline]
 dev_mc_add+0xc8/0x120 net/core/dev_addr_lists.c:886
 igmp6_group_added+0x234/0x820 net/ipv6/mcast.c:681
 __ipv6_dev_mc_inc+0x897/0xa50 net/ipv6/mcast.c:972
 addrconf_join_solict+0x104/0x190 net/ipv6/addrconf.c:2246
 __ipv6_dev_ac_inc+0x87b/0xaf0 net/ipv6/anycast.c:380
 ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153
 do_ipv6_setsockopt+0x2031/0x31c0 net/ipv6/ipv6_sockglue.c:901
 ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:973
 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2322
 __sys_setsockopt net/socket.c:2347 [inline]
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb4c539bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb4c61ab028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb4c5615fa0 RCX: 00007fb4c539bf79
RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000005
RBP: 00007fb4c54327e0 R08: 0000000000000014 R09: 0000000000000000
R10: 0000200000000280 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb4c5616038 R14: 00007fb4c5615fa0 R15: 00007ffcc57b6c88
 </TASK>
----------------
Code disassembly (best guess):
   0:	41 ff d3             	call   *%r11
   3:	e9 06 fc ff ff       	jmp    0xfffffc0e
   8:	e8 51 66 53 f8       	call   0xf853665e
   d:	e9 fc fb ff ff       	jmp    0xfffffc0e
  12:	e8 47 66 53 f8       	call   0xf853665e
  17:	48 8d 3d 20 66 ae 06 	lea    0x6ae6620(%rip),%rdi        # 0x6ae663e
  1e:	48 c7 c6 e0 c0 db 8c 	mov    $0xffffffff8cdbc0e0,%rsi
  25:	ba 43 25 00 00       	mov    $0x2543,%edx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 22 fb ff ff       	jmp    0xfffffb56
  34:	e8 25 66 53 f8       	call   0xf853665e
  39:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
  3e:	48                   	rex.W
  3f:	c7                   	.byte 0xc7