kasan: CONFIG_KASAN_INLINE enabled
overlayfs: filesystem on './file0' not supported as upperdir
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 31136 Comm: syz-executor4 Not tainted 4.20.0-rc7-next-20181224 #188
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fdb_find_rcu+0x194/0xc90 include/linux/string.h:352
Code: 40 84 c6 0f 85 23 09 00 00 84 c9 0f 95 c2 0f 9e c0 84 c2 0f 85 13 09 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 e0 48 c1 e8 03 <0f> b6 14 08 49 8d 44 24 05 48 89 c6 48 c1 ee 03 0f b6 0c 0e 4c 89
RSP: 0018:ffff8881867370b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 1ffff11030ce6e01 RDI: ffff8881867371a8
RBP: ffff888186737310 R08: ffff888182678080 R09: ffffed103b5a5b8f
R10: ffffed103b5a5b8f R11: ffff8881dad2dc7b R12: 0000000000000000
R13: 0000000000000001 R14: ffff88817e609680 R15: ffff8881867372e8
FS:  00007f99680ee700(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000073c000 CR3: 00000001cd62a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 br_fdb_find_rcu net/bridge/br_fdb.c:152 [inline]
 br_fdb_get+0xac/0x230 net/bridge/br_fdb.c:788
 rtnl_fdb_get+0x8a0/0x13b0 net/core/rtnetlink.c:4166
kobject: 'loop5' (00000000a52110eb): kobject_uevent_env
kobject: 'loop5' (00000000a52110eb): fill_kobj_path: path = '/devices/virtual/block/loop5'
 rtnetlink_rcv_msg+0x46a/0xc20 net/core/rtnetlink.c:5125
 netlink_rcv_skb+0x16c/0x430 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5143
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x59f/0x750 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:631
 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
 __sys_sendmsg+0x11d/0x280 net/socket.c:2154
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg net/socket.c:2161 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457759
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f99680edc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457759
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f99680ee6d4
R13: 00000000004c49c9 R14: 00000000004d80a0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 28a863a678d36ea6 ]---
RIP: 0010:fdb_find_rcu+0x194/0xc90 include/linux/string.h:352
Code: 40 84 c6 0f 85 23 09 00 00 84 c9 0f 95 c2 0f 9e c0 84 c2 0f 85 13 09 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 e0 48 c1 e8 03 <0f> b6 14 08 49 8d 44 24 05 48 89 c6 48 c1 ee 03 0f b6 0c 0e 4c 89
RSP: 0018:ffff8881867370b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 1ffff11030ce6e01 RDI: ffff8881867371a8
RBP: ffff888186737310 R08: ffff888182678080 R09: ffffed103b5a5b8f
R10: ffffed103b5a5b8f R11: ffff8881dad2dc7b R12: 0000000000000000
R13: 0000000000000001 R14: ffff88817e609680 R15: ffff8881867372e8
FS:  00007f99680ee700(0000) GS:ffff8881dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000470042 CR3: 00000001cd62a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400