bisecting fixing commit since c10b57a567e4333b9fdf60b5ec36de9859263ca2
building syzkaller on 3f3c557402456696073f79aafa65b4d7fa2b8794
testing commit c10b57a567e4333b9fdf60b5ec36de9859263ca2 with gcc (GCC) 8.1.0
kernel signature: 23e268f55e586c65a909324b83f4dc5b4b3fe547fecb07d080252b2db0dce8ca
all runs: crashed: BUG: looking up invalid subclass: 8
testing current HEAD ab9dfda232481dcfaf549ce774004d116fc80c13
testing commit ab9dfda232481dcfaf549ce774004d116fc80c13 with gcc (GCC) 8.1.0
kernel signature: 30b0ccde14c93fe0057c6fe265be4f92c4533e706ff0cfe9c7547398dba850f6
all runs: crashed: BUG: looking up invalid subclass: 8
revisions tested: 2, total time: 26m18.895855712s (build: 18m40.601711165s, test: 6m24.182252746s)
the crash still happens on HEAD
commit msg: Linux 4.14.180
crash: BUG: looking up invalid subclass: 8
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
BUG: looking up invalid subclass: 8
turning off the locking correctness validator.
CPU: 1 PID: 10249 Comm: syz-executor.0 Not tainted 4.14.180-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+0xf7/0x13b lib/dump_stack.c:58
 look_up_lock_class kernel/locking/lockdep.c:673 [inline]
 register_lock_class+0x5b7/0x1cd0 kernel/locking/lockdep.c:756
 __lockdep_init_map+0x2b8/0x550 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+0x252/0xe50 net/core/dev.c:7591
 register_vlan_dev+0x24f/0x650 net/8021q/vlan.c:168
 vlan_newlink+0x366/0x4d0 net/8021q/vlan_netlink.c:165
 rtnl_newlink+0xbdd/0x1390 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x34c/0x9e0 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x133/0x370 net/netlink/af_netlink.c:2433
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4327
 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
 ___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+0x42/0xb7
RIP: 0033:0x45c889
RSP: 002b:00007fdb1a80dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdb1a80e6d4 RCX: 000000000045c889
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009fe R14: 00000000004ccba4 R15: 000000000076bf0c
neighbour: ndisc_cache: neighbor table overflow!