bisecting fixing commit since dda0e2920330128e0dbdeb11c8f25031aa40b11c
building syzkaller on a8c6a3f8da30ccf825c6001c81a8adff21829c30
testing commit dda0e2920330128e0dbdeb11c8f25031aa40b11c with gcc (GCC) 8.1.0
kernel signature: 39772e6943f94474aa38c73badcc0f4684441ce94d62330fbdc49354c38ab2fd
all runs: crashed: BUG: looking up invalid subclass: 8
testing current HEAD a834132bd465f9d7f4049be65648e01cf2533cb8
testing commit a834132bd465f9d7f4049be65648e01cf2533cb8 with gcc (GCC) 8.1.0
kernel signature: bf2c9d1c25bbb6357d6fea07df92c7f0ffe33ee7cac57840ddaa58eb0ce39f97
all runs: crashed: BUG: looking up invalid subclass: 8
revisions tested: 2, total time: 27m46.029643433s (build: 19m37.796548645s, test: 6m44.915866047s)
the crash still happens on HEAD
commit msg: Linux 4.19.140
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: 0 PID: 10149 Comm: syz-executor.5 Not tainted 4.19.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x177 lib/dump_stack.c:118
 look_up_lock_class kernel/locking/lockdep.c:662 [inline]
 register_lock_class+0x952/0x2350 kernel/locking/lockdep.c:748
 __lockdep_init_map+0x2b8/0x590 kernel/locking/lockdep.c:3214
 lockdep_init_map+0x9/0x10 kernel/locking/lockdep.c:3223
 vlan_dev_set_lockdep_class net/8021q/vlan_dev.c:511 [inline]
 vlan_dev_init+0x75d/0xba0 net/8021q/vlan_dev.c:606
 register_netdevice+0x25b/0xfb0 net/core/dev.c:8646
 register_vlan_dev+0x253/0x690 net/8021q/vlan.c:172
 vlan_newlink+0x3f2/0x680 net/8021q/vlan_netlink.c:189
 rtnl_newlink+0xc7d/0x1320 net/core/rtnetlink.c:3141
 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4778
 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4796
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x443/0x650 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x765/0xc40 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:632
 ___sys_sendmsg+0x647/0x950 net/socket.c:2115
 __sys_sendmsg+0xd9/0x180 net/socket.c:2153
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg net/socket.c:2160 [inline]
 __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c909
Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f47ef847c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f47ef8486d4 RCX: 000000000045c909
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009fc R14: 00000000004ccbfc R15: 000000000076bf0c
neighbour: ndisc_cache: neighbor table overflow!