==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88809b882c20 by task syz-executor.4/9008

CPU: 1 PID: 9008 Comm: syz-executor.4 Not tainted 5.2.0-rc3+ #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2552851648:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4178!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9008 Comm: syz-executor.4 Not tainted 5.2.0-rc3+ #24
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 dd 4b 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 dd 4b 62 88 e8 5c b2 07 00 44 89 e1 48 c7 c7 98 4c
RSP: 0018:ffff88809b881b28 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88809b880a80 RSI: 0000000000000000 RDI: ffff88809b881be0
RBP: ffff88809b881b78 R08: 0000000000000002 R09: ffff8880aa400dc0
R10: 0000000000000f54 R11: 0000000000000001 R12: ffff88809b881be0
R13: ffffea00026e2000 R14: ffff88809b881be2 R15: 0000000000000001
FS:  0000555555a0f940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c00d060 CR3: 0000000089995000 CR4: 00000000001406e0
Call Trace:
Modules linked in:
---[ end trace 5fd338cc9b0c2dd7 ]---
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178
Code: 2b 48 c7 c7 dd 4b 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 dd 4b 62 88 e8 5c b2 07 00 44 89 e1 48 c7 c7 98 4c
RSP: 0018:ffff88809b881b28 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff88809b880a80 RSI: 0000000000000000 RDI: ffff88809b881be0
RBP: ffff88809b881b78 R08: 0000000000000002 R09: ffff8880aa400dc0
R10: 0000000000000f54 R11: 0000000000000001 R12: ffff88809b881be0
R13: ffffea00026e2000 R14: ffff88809b881be2 R15: 0000000000000001
FS:  0000555555a0f940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c00d060 CR3: 0000000089995000 CR4: 00000000001406e0