------------[ cut here ]------------
RTNL: assertion failed at net/core/dev.c (9539)
WARNING: net/core/dev.c:9539 at __dev_set_promiscuity+0x26d/0x370 net/core/dev.c:9539, CPU#1: syz.2.1761/12674
Modules linked in:
CPU: 1 UID: 0 PID: 12674 Comm: syz.2.1761 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+0x279/0x370 net/core/dev.c:9539
Code: f6 a5 f8 85 ed 75 bc e8 75 fb a5 f8 90 0f 0b 90 eb b1 e8 6a fb a5 f8 48 8d 3d 83 dd 84 07 ba 43 25 00 00 48 c7 c6 00 47 f1 8c <67> 48 0f b9 3a e9 e5 fd ff ff e8 48 fb a5 f8 48 8d 7b 08 48 b8 00
RSP: 0018:ffffc90004777718 EFLAGS: 00010283
RAX: 00000000000008a7 RBX: ffff888058c76000 RCX: ffffc90005a49000
RDX: 0000000000002543 RSI: ffffffff8cf14700 RDI: ffffffff90e77e20
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000001103
R13: ffff888058c760b0 R14: 0000000000000000 R15: 00000000ffffffff
FS:  00007f20c08246c0(0000) GS:ffff888124448000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe8c81456b8 CR3: 00000000358e9000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __dev_set_rx_mode+0x252/0x2e0 net/core/dev.c:9661
 __dev_mc_add net/core/dev_addr_lists.c:872 [inline]
 dev_mc_add+0xee/0x110 net/core/dev_addr_lists.c:886
 igmp6_group_added+0x3e4/0x4c0 net/ipv6/mcast.c:681
 __ipv6_dev_mc_inc+0x6f9/0xbc0 net/ipv6/mcast.c:972
 addrconf_join_solict+0x109/0x160 net/ipv6/addrconf.c:2246
 __ipv6_dev_ac_inc+0x938/0xdc0 net/ipv6/anycast.c:380
 ipv6_sock_ac_join+0x929/0x10d0 net/ipv6/anycast.c:153
 do_ipv6_setsockopt+0x37b4/0x4510 net/ipv6/ipv6_sockglue.c:901
 ipv6_setsockopt+0xcb/0x170 net/ipv6/ipv6_sockglue.c:973
 udpv6_setsockopt+0x7d/0xd0 net/ipv6/udp.c:1846
 do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2322
 __sys_setsockopt+0x195/0x220 net/socket.c:2347
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f20bf99c629
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:00007f20c0824028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f20bfc15fa0 RCX: 00007f20bf99c629
RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007f20bfa32b39 R08: 0000000000000014 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f20bfc16038 R14: 00007f20bfc15fa0 R15: 00007fff2f0791a8
 </TASK>
----------------
Code disassembly (best guess):
   0:	f6 a5 f8 85 ed 75    	mulb   0x75ed85f8(%rbp)
   6:	bc e8 75 fb a5       	mov    $0xa5fb75e8,%esp
   b:	f8                   	clc
   c:	90                   	nop
   d:	0f 0b                	ud2
   f:	90                   	nop
  10:	eb b1                	jmp    0xffffffc3
  12:	e8 6a fb a5 f8       	call   0xf8a5fb81
  17:	48 8d 3d 83 dd 84 07 	lea    0x784dd83(%rip),%rdi        # 0x784dda1
  1e:	ba 43 25 00 00       	mov    $0x2543,%edx
  23:	48 c7 c6 00 47 f1 8c 	mov    $0xffffffff8cf14700,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 e5 fd ff ff       	jmp    0xfffffe19
  34:	e8 48 fb a5 f8       	call   0xf8a5fb81
  39:	48 8d 7b 08          	lea    0x8(%rbx),%rdi
  3d:	48                   	rex.W
  3e:	b8                   	.byte 0xb8