bisecting fixing commit since c10b57a567e4333b9fdf60b5ec36de9859263ca2
building syzkaller on 2e44d63e401ead7d7928c95a30d243b2de1a243b
testing commit c10b57a567e4333b9fdf60b5ec36de9859263ca2 with gcc (GCC) 8.1.0
kernel signature: a27bb820489569cac9a8aa7173577eeab9769981a860a753cf1dc7fa86057a7e
all runs: crashed: general protection fault in vxlan_fdb_destroy
testing current HEAD 14b58326976de6ef3998eefec1dd7f8b38b97a75
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.1.0
kernel signature: 4148a6596ced0479225f3a6823fb336adfd2c63c62f261bd674c99b8ea396d73
all runs: crashed: general protection fault in vxlan_fdb_destroy
revisions tested: 2, total time: 27m29.688355462s (build: 19m5.763515157s, test: 7m4.981130819s)
the crash still happens on HEAD
commit msg: Linux 4.14.193
crash: general protection fault in vxlan_fdb_destroy
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
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
Modules linked in:
CPU: 0 PID: 7711 Comm: syz-executor.3 Not tainted 4.14.193-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a7c30280 task.stack: ffff888089988000
RIP: 0010:__write_once_size include/linux/compiler.h:210 [inline]
RIP: 0010:__hlist_del include/linux/list.h:679 [inline]
RIP: 0010:hlist_del_rcu include/linux/rculist.h:427 [inline]
RIP: 0010:vxlan_fdb_destroy+0xa0/0x1b0 drivers/net/vxlan.c:787
RSP: 0018:ffff88808998ef88 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: ffff8880a882b500 RCX: 1ffff11011213c08
RDX: 1bd5a00000000040 RSI: ffff8880a882b500 RDI: ffff88808909e040
RBP: ffff88808998efb0 R08: ffff8880a7c30b50 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dead000000000200 R14: ffff8880a882b508 R15: 00000000fffffff0
FS:  00007fddc12ce700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb2fc0f6018 CR3: 00000000a8079000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __vxlan_dev_create+0x3a9/0x740 drivers/net/vxlan.c:3274
 vxlan_newlink+0x99/0xd0 drivers/net/vxlan.c:3495
 rtnl_newlink+0xc2b/0x13a0 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x34c/0x9e0 net/core/rtnetlink.c:4316
 netlink_rcv_skb+0x12f/0x3b0 net/netlink/af_netlink.c:2433
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4328
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x40b/0x600 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x730/0xbd0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:656
 kernel_sendmsg+0x26/0x30 net/socket.c:664
 sock_no_sendpage+0xf7/0x130 net/core/sock.c:2574
 kernel_sendpage+0x60/0xd0 net/socket.c:3407
 sock_sendpage+0x6d/0xd0 net/socket.c:871
 pipe_to_sendpage+0x206/0x420 fs/splice.c:451
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x2cb/0x720 fs/splice.c:626
 splice_from_pipe+0xb5/0x110 fs/splice.c:661
 generic_splice_sendpage+0x10/0x20 fs/splice.c:832
 do_splice_from fs/splice.c:851 [inline]
 do_splice fs/splice.c:1147 [inline]
 SYSC_splice fs/splice.c:1402 [inline]
 SyS_splice+0x6e9/0x1580 fs/splice.c:1382
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45c8a9
RSP: 002b:00007fddc12cdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000507440 RCX: 000000000045c8a9
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 000000000004ffe2 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000ba4 R14: 00000000004ce790 R15: 00007fddc12ce6d4
Code: 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 02 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 08 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 d6 00 00 00 4d 85 e4 4d 89 65 00 74 25 49 8d 
RIP: __write_once_size include/linux/compiler.h:210 [inline] RSP: ffff88808998ef88
RIP: __hlist_del include/linux/list.h:679 [inline] RSP: ffff88808998ef88
RIP: hlist_del_rcu include/linux/rculist.h:427 [inline] RSP: ffff88808998ef88
RIP: vxlan_fdb_destroy+0xa0/0x1b0 drivers/net/vxlan.c:787 RSP: ffff88808998ef88
---[ end trace 6a0ea21af5afb20d ]---