bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217
building syzkaller on 6e262c73cd452097096f0b4d5d96f5ae496bc021
testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.1.0
kernel signature: 72d240c2d8d6034dffbda4373f5e21318b217791c4123d0afb709f27c0ca396e
run #0: crashed: BUG: looking up invalid subclass: 8
run #1: crashed: BUG: looking up invalid subclass: 8
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: OK
run #8: crashed: BUG: looking up invalid subclass: 8
run #9: crashed: BUG: looking up invalid subclass: 8
testing current HEAD 31acccdc877486a649a86d37725a15175fcd5ed6
testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.1.0
kernel signature: 5809d5597daf6fc4b89d459a888d340c8964242c81b7f2cc77e086f96ef45e15
run #0: crashed: BUG: looking up invalid subclass: 8
run #1: crashed: BUG: looking up invalid subclass: 8
run #2: crashed: BUG: looking up invalid subclass: 8
run #3: crashed: BUG: looking up invalid subclass: 8
run #4: OK
run #5: crashed: BUG: looking up invalid subclass: 8
run #6: crashed: BUG: looking up invalid subclass: 8
run #7: OK
run #8: crashed: BUG: looking up invalid subclass: 8
run #9: crashed: BUG: looking up invalid subclass: 8
revisions tested: 2, total time: 38m8.654287583s (build: 17m32.123711687s, test: 19m51.813928513s)
the crash still happens on HEAD
commit msg: Linux 4.19.157
crash: BUG: looking up invalid subclass: 8
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
BUG: looking up invalid subclass: 8
turning off the locking correctness validator.
CPU: 1 PID: 17327 Comm: syz-executor228 Not tainted 4.19.157-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+0x17c/0x22a lib/dump_stack.c:118
 look_up_lock_class kernel/locking/lockdep.c:662 [inline]
 register_lock_class+0x730/0x1b10 kernel/locking/lockdep.c:748
 __lockdep_init_map+0x271/0x590 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+0x269/0xfa0 net/core/dev.c:8647
 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/0x950 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+0x443/0x660 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x666/0xc50 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xac/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: 0033:0x441f19
Code: e8 bc 00 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 7b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd62b5fb78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441f19
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000001d00000000 R09: 0000001d00000000
R10: 0000001d00000000 R11: 0000000000000246 R12: 0000000000077762
R13: 0000000000000000 R14: 000000000000000c R15: 0000000000000004