==================================================================
BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88808b56bb70 by task syz-executor.2/9471

CPU: 1 PID: 9471 Comm: syz-executor.2 Not tainted 5.2.0-rc3+ #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 120:
(stack is not available)

Freed by task 2272119270:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4178!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9471 Comm: syz-executor.2 Not tainted 5.2.0-rc3+ #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178
Code: 2b 48 c7 c7 4d 03 62 88 e8 48 ad 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 4d 03 62 88 e8 5c b2 07 00 44 89 e1 48 c7 c7 08 04
RSP: 0018:ffff88808b56b1c8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88808b56a040 RSI: 0000000000000000 RDI: ffff88808b56b280
RBP: ffff88808b56b218 R08: 0000000000000002 R09: ffff8880aa400dc0
R10: 000000000000101a R11: 0000000000000001 R12: ffff88808b56b280
R13: ffffea00022d5a80 R14: ffff88808b56b282 R15: 0000000000000001
FS:  0000555555593940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c045c18 CR3: 00000000a8d65000 CR4: 00000000001406e0
Call Trace:
Modules linked in:
---[ end trace 1265e9c877d9780c ]---
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178
Code: 2b 48 c7 c7 4d 03 62 88 e8 48 ad 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 4d 03 62 88 e8 5c b2 07 00 44 89 e1 48 c7 c7 08 04
RSP: 0018:ffff88808b56b1c8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88808b56a040 RSI: 0000000000000000 RDI: ffff88808b56b280
RBP: ffff88808b56b218 R08: 0000000000000002 R09: ffff8880aa400dc0
R10: 000000000000101a R11: 0000000000000001 R12: ffff88808b56b280
R13: ffffea00022d5a80 R14: ffff88808b56b282 R15: 0000000000000001
FS:  0000555555593940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c045c18 CR3: 00000000a8d65000 CR4: 00000000001406e0