------------[ 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.2.7157/30063
Modules linked in:
CPU: 1 UID: 0 PID: 30063 Comm: syz.2.7157 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: 7c 83 16 e9 06 fc ff ff e8 d1 09 47 f8 e9 fc fb ff ff e8 c7 09 47 f8 48 8d 3d c0 d6 a1 06 48 c7 c6 e0 7c dc 8c ba 55 25 00 00 <67> 48 0f b9 3a e9 22 fb ff ff e8 a5 09 47 f8 48 8b 7c 24 08 48 c7
RSP: 0018:ffffc9000fc47660 EFLAGS: 00010287
RAX: ffffffff897e9869 RBX: ffff888039e4c000 RCX: 0000000000080000
RDX: 0000000000002555 RSI: ffffffff8cdc7ce0 RDI: ffffffff90206f30
RBP: 0000000000000000 R08: ffffffff8fbce9a7 R09: 1ffffffff1f79d34
R10: dffffc0000000000 R11: fffffbfff1f79d35 R12: 00000000ffffffff
R13: 0000000000000000 R14: ffff888039e4c0b0 R15: 1ffff110073c9816
FS:  0000000000000000(0000) GS:ffff88812555d000(0063) knlGS:00000000f53b4b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000030e17ff8 CR3: 0000000051a66000 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:2245
 __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]
 __ia32_sys_setsockopt+0x13d/0x1b0 net/socket.c:2350
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x20d/0x640 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f34f6c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f53b450c EFLAGS: 00000206 ORIG_RAX: 000000000000016e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000029
RDX: 000000000000001b RSI: 0000000080000100 RDI: 0000000000000014
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	e9 06 fc ff ff       	jmp    0xfffffc0b
   5:	e8 d1 09 47 f8       	call   0xf84709db
   a:	e9 fc fb ff ff       	jmp    0xfffffc0b
   f:	e8 c7 09 47 f8       	call   0xf84709db
  14:	48 8d 3d c0 d6 a1 06 	lea    0x6a1d6c0(%rip),%rdi        # 0x6a1d6db
  1b:	48 c7 c6 e0 7c dc 8c 	mov    $0xffffffff8cdc7ce0,%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 a5 09 47 f8       	call   0xf84709db
  36:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7