bisecting fixing commit since 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c
building syzkaller on fc9fd31ee7998c8b747752791000ea4eef07b5c6
testing commit 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c with gcc (GCC) 8.4.1 20210217
kernel signature: d2a563536a363c7bce0627bdbd2c80696efbe6f8bbeba66a9414c2f5e04fd13b
all runs: crashed: BUG: looking up invalid subclass: 8
testing current HEAD 7d7d1c0ab3eb7c8d8f63a126535018007823b207
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: 78e41e33f6963e2441e3b9a6408a24c50f6d52694199a5ff9439b82f8c8b8e76
all runs: crashed: BUG: looking up invalid subclass: 8
revisions tested: 2, total time: 27m9.040905674s (build: 14m10.696086352s, test: 12m40.093041356s)
the crash still happens on HEAD
commit msg: Linux 4.14.232
crash: BUG: looking up invalid subclass: 8
bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
IPVS: ftp: loaded support on port[0] = 21
Bluetooth: hci0 command 0x0409 tx timeout
BUG: looking up invalid subclass: 8
turning off the locking correctness validator.
CPU: 1 PID: 17678 Comm: syz-executor387 Not tainted 4.14.232-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/0x1e7 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+0xcc9/0x1630 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+0x639/0xbe0 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: 0033:0x446859
RSP: 002b:00007f05f370f318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004cb448 RCX: 0000000000446859
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00000000004cb440 R08: 0000000000000009 R09: 0000000000000000
R10: 0000000000000028 R11: 0000000000000246 R12: 000000000049b154
R13: 00007ffd9a630bbf R14: 00007f05f370f400 R15: 0000000000022000
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout