------------[ cut here ]------------
RTNL: assertion failed at net/core/dev.c (9557)
WARNING: net/core/dev.c:9557 at __dev_set_promiscuity+0x530/0x710 net/core/dev.c:9557, CPU#1: syz.2.3830/23249
Modules linked in:
CPU: 1 UID: 0 PID: 23249 Comm: syz.2.3830 Tainted: G             L      syzkaller #0 PREEMPT(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:9557
Code: d3 83 16 e9 06 fc ff ff e8 c1 5b 47 f8 e9 fc fb ff ff e8 b7 5b 47 f8 48 8d 3d d0 10 a2 06 48 c7 c6 20 66 dc 8c ba 55 25 00 00 <67> 48 0f b9 3a e9 22 fb ff ff e8 95 5b 47 f8 48 8b 7c 24 08 48 c7
RSP: 0018:ffffc90003dff820 EFLAGS: 00010287
RAX: ffffffff897e4429 RBX: ffff88803f2a2000 RCX: 0000000000080000
RDX: 0000000000002555 RSI: ffffffff8cdc6620 RDI: ffffffff90205500
RBP: 0000000000000000 R08: ffffffff8fbcd867 R09: 1ffffffff1f79b0c
R10: dffffc0000000000 R11: fffffbfff1f79b0d R12: 00000000ffffffff
R13: 0000000000000000 R14: ffff88803f2a20b0 R15: 1ffff11007e54416
FS:  00007fd9cf4c66c0(0000) GS:ffff888125560000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2cc8e5 CR3: 0000000030dda000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000003e4f
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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
 __ipv6_sock_mc_join+0x503/0x750 net/ipv6/mcast.c:234
 do_ipv6_setsockopt+0x22eb/0x31c0 net/ipv6/ipv6_sockglue.c:883
 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: 0033:0x7fd9ce59c799
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:00007fd9cf4c6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fd9ce815fa0 RCX: 00007fd9ce59c799
RDX: 0000000000000014 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007fd9ce632c99 R08: 000000000000003d R09: 0000000000000000
R10: 0000200000000440 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd9ce816038 R14: 00007fd9ce815fa0 R15: 00007fd9ce93fa48
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	e9 06 fc ff ff       	jmp    0xfffffc0b
   5:	e8 c1 5b 47 f8       	call   0xf8475bcb
   a:	e9 fc fb ff ff       	jmp    0xfffffc0b
   f:	e8 b7 5b 47 f8       	call   0xf8475bcb
  14:	48 8d 3d d0 10 a2 06 	lea    0x6a210d0(%rip),%rdi        # 0x6a210eb
  1b:	48 c7 c6 20 66 dc 8c 	mov    $0xffffffff8cdc6620,%rsi
  22:	ba 55 25 00 00       	mov    $0x2555,%edx
* 27:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2c:	e9 22 fb ff ff       	jmp    0xfffffb53
  31:	e8 95 5b 47 f8       	call   0xf8475bcb
  36:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7