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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1579
Read of size 8 at addr ffff88807af55ef0 by task syz-executor.2/9159

CPU: 1 PID: 9159 Comm: syz-executor.2 Not tainted 5.2.0+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2062899245:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4178!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9159 Comm: syz-executor.2 Not tainted 5.2.0+ #55
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 05 2e 83 88 e8 58 b8 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 2e 83 88 e8 6c bd 07 00 44 89 e1 48 c7 c7 c0 2e
RSP: 0018:ffff88807af555e8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88807af544c0 RSI: 0000000000000000 RDI: ffff88807af556a0
RBP: ffff88807af55638 R08: 0000000000000002 R09: ffff88821bc47200
R10: 0000000000000fc5 R11: 0000000000000001 R12: ffff88807af556a0
R13: ffffea0001ebd500 R14: ffff88807af556a2 R15: 0000000000000001
FS:  0000555555686940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c223f80 CR3: 00000000926ae000 CR4: 00000000001406e0
Call Trace:
Modules linked in:
---[ end trace 79909de0868e4cd4 ]---
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178
Code: 2b 48 c7 c7 05 2e 83 88 e8 58 b8 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 2e 83 88 e8 6c bd 07 00 44 89 e1 48 c7 c7 c0 2e
RSP: 0018:ffff88807af555e8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88807af544c0 RSI: 0000000000000000 RDI: ffff88807af556a0
RBP: ffff88807af55638 R08: 0000000000000002 R09: ffff88821bc47200
R10: 0000000000000fc5 R11: 0000000000000001 R12: ffff88807af556a0
R13: ffffea0001ebd500 R14: ffff88807af556a2 R15: 0000000000000001
FS:  0000555555686940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c223f80 CR3: 00000000926ae000 CR4: 00000000001406e0