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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1574
Read of size 8 at addr ffff88809a2aeb70 by task syz-executor.4/9337

CPU: 0 PID: 9337 Comm: syz-executor.4 Not tainted 5.2.0-rc3-next-20190606 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2315706496:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4176!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9337 Comm: syz-executor.4 Not tainted 5.2.0-rc3-next-20190606 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4176
Code: 2b 48 c7 c7 05 fc 82 88 e8 e8 ba 07 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 bd 48 01 d0 48 29 c8 4c 39 c0 72 b2 c3 <0f> 0b 48 c7 c7 05 fc 82 88 e8 fc bf 07 00 44 89 e1 48 c7 c7 e0 fc
RSP: 0018:ffff88809a2adff8 EFLAGS: 00010097
RAX: 00000000000f0f0e RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88809a2aed40 RSI: 0000000000000000 RDI: ffff88809a2ae0b0
RBP: ffff88809a2ae048 R08: 0000000000000002 R09: ffff8880aa400dc0
R10: 00000000e1e1d6cc R11: 0000000000000001 R12: ffff88809a2ae0b0
R13: ffffea000268ab80 R14: ffff88809a2ae0b2 R15: 0000000000000001
FS:  000055555658c940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c215220 CR3: 000000008f4ca000 CR4: 00000000001406f0
Call Trace:
Modules linked in:
---[ end trace 27d7119f336b84f9 ]---
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4176
Code: 2b 48 c7 c7 05 fc 82 88 e8 e8 ba 07 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 bd 48 01 d0 48 29 c8 4c 39 c0 72 b2 c3 <0f> 0b 48 c7 c7 05 fc 82 88 e8 fc bf 07 00 44 89 e1 48 c7 c7 e0 fc
RSP: 0018:ffff88809a2adff8 EFLAGS: 00010097
RAX: 00000000000f0f0e RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88809a2aed40 RSI: 0000000000000000 RDI: ffff88809a2ae0b0
RBP: ffff88809a2ae048 R08: 0000000000000002 R09: ffff8880aa400dc0
R10: 00000000e1e1d6cc R11: 0000000000000001 R12: ffff88809a2ae0b0
R13: ffffea000268ab80 R14: ffff88809a2ae0b2 R15: 0000000000000001
FS:  000055555658c940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c215220 CR3: 000000008f4ca000 CR4: 00000000001406f0