RSP: 002b:00007fca471dac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fca471dac90 RCX: 00000000004598e9
RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 000000000000052d R09: 0000000000000000
R10: 0000000020000040 R11: 0000000000000246 R12: 00007fca471db6d4
R13: 00000000004c8313 R14: 00000000004ded00 R15: 0000000000000005
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 28973 Comm: syz-executor.2 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:addrconf_f6i_alloc+0x32d/0x4a0 net/ipv6/route.c:4410
Code: 59 bc ff ff 48 85 c0 49 89 c4 74 3d e8 dc 36 32 fb 49 8d bc 24 86 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 1f 01 00 00
RSP: 0018:ffff88806e227638 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff1100dc44ec9 RCX: ffffc90006146000
RDX: 000000000000000f RSI: ffffffff86403e74 RDI: 000000000000007a
RBP: ffff88806e2277b8 R08: ffff888054d3e380 R09: fffffbfff11cae6f
R10: fffffbfff11cae6e R11: ffffffff88e57373 R12: fffffffffffffff4
R13: ffff8880a7bf6480 R14: ffff88806e2279d0 R15: 0000000000000001
FS:  00007fca471db700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 0000000053cfe000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __ipv6_dev_ac_inc+0x274/0x9d0 net/ipv6/anycast.c:301
 ipv6_sock_ac_join+0x4bb/0x790 net/ipv6/anycast.c:139
 do_ipv6_setsockopt.isra.0+0x37bb/0x4100 net/ipv6/ipv6_sockglue.c:670
 ipv6_setsockopt+0xf6/0x170 net/ipv6/ipv6_sockglue.c:944
 udpv6_setsockopt+0x68/0xb0 net/ipv6/udp.c:1558
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3139
 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fca471dac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fca471dac90 RCX: 00000000004598e9
RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 000000000000052d R09: 0000000000000000
R10: 0000000020000040 R11: 0000000000000246 R12: 00007fca471db6d4
R13: 00000000004c8313 R14: 00000000004ded00 R15: 0000000000000005
Modules linked in:
---[ end trace 47ab2cb3a1d03774 ]---
RIP: 0010:addrconf_f6i_alloc+0x32d/0x4a0 net/ipv6/route.c:4410
Code: 59 bc ff ff 48 85 c0 49 89 c4 74 3d e8 dc 36 32 fb 49 8d bc 24 86 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 1f 01 00 00
RSP: 0018:ffff88806e227638 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff1100dc44ec9 RCX: ffffc90006146000
RDX: 000000000000000f RSI: ffffffff86403e74 RDI: 000000000000007a
RBP: ffff88806e2277b8 R08: ffff888054d3e380 R09: fffffbfff11cae6f
R10: fffffbfff11cae6e R11: ffffffff88e57373 R12: fffffffffffffff4
R13: ffff8880a7bf6480 R14: ffff88806e2279d0 R15: 0000000000000001
FS:  00007fca471db700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 0000000053cfe000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400