bisecting fixing commit since 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60
building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7
testing commit 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60 with gcc (GCC) 8.1.0
kernel signature: 1a2d404dd62e1a939644c08342f5a014d14c9a1d4007c8fa62e0d6f463f834f5
all runs: crashed: BUG: looking up invalid subclass: 8
testing current HEAD bae31eef2a167ef160ab2703b6a2f5bbecd98d92
testing commit bae31eef2a167ef160ab2703b6a2f5bbecd98d92 with gcc (GCC) 8.1.0
kernel signature: 6673017f5efc1822976244b9a7b0abc4c89dd55871e83ac6420d440bbbba2269
all runs: crashed: BUG: looking up invalid subclass: 8
revisions tested: 2, total time: 38m33.714407957s (build: 17m38.642598825s, test: 20m4.243214985s)
the crash still happens on HEAD
commit msg: Linux 4.14.200
crash: BUG: looking up invalid subclass: 8
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
8021q: VLANs not supported on hsr0
8021q: VLANs not supported on hsr0
8021q: VLANs not supported on ipvlan1
8021q: VLANs not supported on ipvlan1
BUG: looking up invalid subclass: 8
turning off the locking correctness validator.
CPU: 1 PID: 12569 Comm: syz-executor071 Not tainted 4.14.200-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1f1 lib/dump_stack.c:58
 look_up_lock_class kernel/locking/lockdep.c:673 [inline]
 register_lock_class+0x77d/0x19a0 kernel/locking/lockdep.c:756
 __lockdep_init_map+0x271/0x550 kernel/locking/lockdep.c:3277
 lockdep_init_map+0x9/0x10 kernel/locking/lockdep.c:3287
 vlan_dev_set_lockdep_class net/8021q/vlan_dev.c:509 [inline]
 vlan_dev_init+0x75d/0xba0 net/8021q/vlan_dev.c:604
 register_netdevice+0x255/0xe50 net/core/dev.c:7590
 register_vlan_dev+0x24f/0x650 net/8021q/vlan.c:168
 vlan_newlink+0x366/0x4d0 net/8021q/vlan_netlink.c:165
 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
 ___sys_sendmsg+0x625/0x920 net/socket.c:2062
 __sys_sendmsg+0xc1/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0xd/0x20 net/socket.c:2103
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4496f9
RSP: 002b:00007fc199ab5db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000006dec48 RCX: 00000000004496f9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00000000006dec40 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000006dec4c
R13: 00007ffde387a67f R14: 00007fc199ab69c0 R15: 00000000006dec4c