------------[ cut here ]------------
RTNL: assertion failed at net/core/dev.c (9555)
WARNING: net/core/dev.c:9555 at __dev_set_promiscuity+0x530/0x710 net/core/dev.c:9555, CPU#0: syz.1.2333/13070
Modules linked in:
CPU: 0 UID: 0 PID: 13070 Comm: syz.1.2333 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
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:9555
Code: c4 0b 17 e9 06 fc ff ff e8 e1 5e ce f8 e9 fc fb ff ff e8 d7 5e ce f8 48 8d 3d 80 db 81 06 48 c7 c6 60 4c 4b 8c ba 53 25 00 00 <67> 48 0f b9 3a e9 22 fb ff ff e8 b5 5e ce f8 48 8b 7c 24 08 48 c7
RSP: 0018:ffffc9000e2af698 EFLAGS: 00010283
RAX: ffffffff88f5f459 RBX: ffff88805f1d8000 RCX: 0000000000080000
RDX: 0000000000002553 RSI: ffffffff8c4b4c60 RDI: ffffffff8f77cfe0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100be3b016 R12: 00000000ffffffff
R13: 0000000000000000 R14: ffff88805f1d80b0 R15: 1ffff1100be3b016
FS:  00007f6a6b2fe6c0(0000) GS:ffff888126340000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3eedb6 CR3: 0000000030ef4000 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+0xd2/0x140 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:2245
 __ipv6_dev_ac_inc+0x8ab/0xb20 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+0x143/0x1b0 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: 0033:0x7f6a6d0ac799
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:00007f6a6b2fe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f6a6d325fa0 RCX: 00007f6a6d0ac799
RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000007
RBP: 00007f6a6d142bd9 R08: 0000000000000014 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6a6d326038 R14: 00007f6a6d325fa0 R15: 00007ffd3a8a12b8
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	0b 17                	or     (%rdi),%edx
   2:	e9 06 fc ff ff       	jmp    0xfffffc0d
   7:	e8 e1 5e ce f8       	call   0xf8ce5eed
   c:	e9 fc fb ff ff       	jmp    0xfffffc0d
  11:	e8 d7 5e ce f8       	call   0xf8ce5eed
  16:	48 8d 3d 80 db 81 06 	lea    0x681db80(%rip),%rdi        # 0x681db9d
  1d:	48 c7 c6 60 4c 4b 8c 	mov    $0xffffffff8c4b4c60,%rsi
  24:	ba 53 25 00 00       	mov    $0x2553,%edx
* 29:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2e:	e9 22 fb ff ff       	jmp    0xfffffb55
  33:	e8 b5 5e ce f8       	call   0xf8ce5eed
  38:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
  3d:	48                   	rex.W
  3e:	c7                   	.byte 0xc7