bisecting fixing commit since 3f2ecb86cb909da0b9157fd2952ad79924cbe5ae building syzkaller on 04201c0669446145fd9c347c5538da0ca13ff29b testing commit 3f2ecb86cb909da0b9157fd2952ad79924cbe5ae with gcc (GCC) 8.1.0 kernel signature: 3a1222f02fa8255f75aeb4f3507e5e105cdaf6b5facedc5d45f5fb1105c9bcb0 run #0: OK run #1: OK run #2: crashed: BUG: looking up invalid subclass: 8 run #3: crashed: BUG: looking up invalid subclass: 8 run #4: crashed: BUG: looking up invalid subclass: 8 run #5: crashed: BUG: looking up invalid subclass: 8 run #6: crashed: BUG: looking up invalid subclass: 8 run #7: crashed: BUG: looking up invalid subclass: 8 run #8: crashed: BUG: looking up invalid subclass: 8 run #9: crashed: BUG: looking up invalid subclass: 8 testing current HEAD 2762b48e9611529239da2e68cba908dbbec9805f testing commit 2762b48e9611529239da2e68cba908dbbec9805f with gcc (GCC) 8.1.0 kernel signature: e0133691d97a9e541197888484681798ee4006412ba4c0fff64de73fe16c0349 run #0: OK run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: crashed: BUG: looking up invalid subclass: 8 run #8: crashed: BUG: looking up invalid subclass: 8 run #9: crashed: BUG: looking up invalid subclass: 8 reproducer seems to be flaky Reproducer flagged being flaky revisions tested: 2, total time: 34m10.549444141s (build: 15m39.085913296s, test: 18m2.211108354s) the crash still happens on HEAD commit msg: Linux 4.14.216 crash: BUG: looking up invalid subclass: 8 IPv6: ADDRCONF(NETDEV_UP): vlan58: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan59: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan60: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan61: link is not ready BUG: looking up invalid subclass: 8 turning off the locking correctness validator. CPU: 0 PID: 5598 Comm: syz-executor151 Not tainted 4.14.216-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+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: 0033:0x446f29 RSP: 002b:00007f0d595f3d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446f29 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00000000006dbc60 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00000000006dbc6c R13: 0000000000040000 R14: 0000000000000000 R15: 0705001000000048 IPv6: ADDRCONF(NETDEV_UP): vlan62: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan63: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan64: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan65: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan66: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan67: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan68: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan69: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan70: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan71: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan72: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan73: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan74: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan75: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan76: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan77: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan78: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan79: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan80: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan81: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan82: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan83: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan84: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan85: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan86: link is not ready IPv6: ADDRCONF(NETDEV_UP): vlan87: link is not ready batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode