syzbot

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: 25985 Comm: kworker/u4:3 Not tainted 5.2.0-rc3+ #56
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:__sock_release+0x2d/0x2a0 net/socket.c:596
Code: e5 41 57 41 56 41 55 41 54 49 89 f4 53 48 89 fb e8 78 9c f7 fb 4c 8d 73 28 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 f5 01 00 00 4c 8b 6b 28 4d 85 ed 0f 84 e9 00 00
RSP: 0018:ffff8880796afb70 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 00000000000000ff RCX: 1ffffffff10e9e4d
RDX: 0000000000000024 RSI: ffffffff85790a08 RDI: 00000000000000ff
RBP: ffff8880796afb98 R08: ffff8880726ae4c0 R09: ffffed1015d26c70
R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: 0000000000000000
R13: 0000000000000007 R14: 0000000000000127 R15: ffff888067fde387
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c425403728 CR3: 000000009ec27000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_release+0x18/0x20 net/socket.c:621
 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline]
 icmpv6_sk_exit+0x11f/0x1c0 net/ipv6/icmp.c:975
 ops_exit_list.isra.0+0xaa/0x150 net/core/net_namespace.c:154
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:553
 process_one_work+0x989/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x354/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 166b90ca8c6e905d ]---
RIP: 0010:__sock_release+0x2d/0x2a0 net/socket.c:596
Code: e5 41 57 41 56 41 55 41 54 49 89 f4 53 48 89 fb e8 78 9c f7 fb 4c 8d 73 28 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 f5 01 00 00 4c 8b 6b 28 4d 85 ed 0f 84 e9 00 00
RSP: 0018:ffff8880796afb70 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 00000000000000ff RCX: 1ffffffff10e9e4d
RDX: 0000000000000024 RSI: ffffffff85790a08 RDI: 00000000000000ff
RBP: ffff8880796afb98 R08: ffff8880726ae4c0 R09: ffffed1015d26c70
R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: 0000000000000000
R13: 0000000000000007 R14: 0000000000000127 R15: ffff888067fde387
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c425403728 CR3: 000000009ec27000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400