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BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff888089e0af40 by task syz-executor.1/10624

CPU: 0 PID: 10624 Comm: syz-executor.1 Not tainted 5.2.0-rc7+ #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2270580032:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4178!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10624 Comm: syz-executor.1 Not tainted 5.2.0-rc7+ #43
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 5d a6 62 88 e8 d8 b0 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 5d a6 62 88 e8 ec b5 07 00 44 89 e1 48 c7 c7 18 a7
RSP: 0018:ffff888089e096f8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff888089e08680 RSI: 0000000000000000 RDI: ffff888089e097b0
RBP: ffff888089e09748 R08: 0000000000000002 R09: ffff88821bc48b00
R10: 0000000000000f2a R11: 0000000000000001 R12: ffff888089e097b0
R13: ffffea0002278200 R14: ffff888089e097b2 R15: 0000000000000001
FS:  000055555681b940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c015f20 CR3: 000000008b350000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
---[ end trace e2b846b7b413cea4 ]---
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178
Code: 2b 48 c7 c7 5d a6 62 88 e8 d8 b0 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 5d a6 62 88 e8 ec b5 07 00 44 89 e1 48 c7 c7 18 a7
RSP: 0018:ffff888089e096f8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff888089e08680 RSI: 0000000000000000 RDI: ffff888089e097b0
RBP: ffff888089e09748 R08: 0000000000000002 R09: ffff88821bc48b00
R10: 0000000000000f2a R11: 0000000000000001 R12: ffff888089e097b0
R13: ffffea0002278200 R14: ffff888089e097b2 R15: 0000000000000001
FS:  000055555681b940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c015f20 CR3: 000000008b350000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400