bisecting fixing commit since 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a
building syzkaller on 70c104a18f3d409bc6dde950b50258d3d280d99b
testing commit 69b94dd6dcd14d9bfcba35a492f5e27c15cf4d0a with gcc (GCC) 8.1.0
kernel signature: d0b483e8f673f9d24f650f39ff5c5ebf6b3b0866afcce08eb25069bfc078634b
all runs: crashed: general protection fault in vxlan_fdb_destroy
testing current HEAD 2762b48e9611529239da2e68cba908dbbec9805f
testing commit 2762b48e9611529239da2e68cba908dbbec9805f with gcc (GCC) 8.1.0
kernel signature: b3e84a535944387a79eb3a47a10a24988c67efab922299345c80e5f38777ef26
all runs: crashed: general protection fault in vxlan_fdb_destroy
revisions tested: 2, total time: 22m22.458856789s (build: 16m17.153577392s, test: 5m31.030248202s)
the crash still happens on HEAD
commit msg: Linux 4.14.216
crash: general protection fault in vxlan_fdb_destroy
device veth1_macvtap entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
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: 1 PID: 7144 Comm: syz-executor.0 Not tainted 4.14.216-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8881dab32100 task.stack: ffff8881dabf0000
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+0x9e/0x180 drivers/net/vxlan.c:787
RSP: 0018:ffff8881dabf6f90 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: ffff8881e1c56b80 RCX: 1ffff1103b1de9d8
RDX: 1bd5a00000000040 RSI: ffff8881e1c56b80 RDI: ffff8881e1c56b88
RBP: ffff8881dabf6fb0 R08: ffff8881dab329d0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dead000000000200 R14: ffff8881dabf7080 R15: 00000000fffffff0
FS:  00007f5833033700(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcb5815da0 CR3: 00000001da310004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __vxlan_dev_create+0x3a9/0x740 drivers/net/vxlan.c:3281
 vxlan_newlink+0x99/0xd0 drivers/net/vxlan.c:3502
 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/0x610 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x657/0xc60 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xac/0xf0 net/socket.c:656
 kernel_sendmsg+0x26/0x30 net/socket.c:664
 sock_no_sendpage+0xf7/0x130 net/core/sock.c:2595
 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: 0033:0x45c1f9
RSP: 002b:00007f5833032c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000032080 RCX: 000000000045c1f9
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 000000000078c098 R08: 000000000004ffe2 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007ffe17ae8cef R14: 00007f58330339c0 R15: 000000000078c04c
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d8 00 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 ac 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: ffff8881dabf6f90
RIP: __hlist_del include/linux/list.h:679 [inline] RSP: ffff8881dabf6f90
RIP: hlist_del_rcu include/linux/rculist.h:427 [inline] RSP: ffff8881dabf6f90
RIP: vxlan_fdb_destroy+0x9e/0x180 drivers/net/vxlan.c:787 RSP: ffff8881dabf6f90
---[ end trace 451088ce366c2f0e ]---