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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff888093b0a520 by task syz-executor.1/9391

CPU: 1 PID: 9391 Comm: syz-executor.1 Not tainted 5.2.0-rc5+ #61
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2477832048:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4178!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9391 Comm: syz-executor.1 Not tainted 5.2.0-rc5+ #61
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 2d 0f 62 88 e8 98 b3 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 2d 0f 62 88 e8 ac b8 07 00 44 89 e1 48 c7 c7 e8 0f
RSP: 0018:ffff888093b09428 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff888093b083c0 RSI: 0000000000000000 RDI: ffff888093b094e0
RBP: ffff888093b09478 R08: 0000000000000002 R09: ffff8880aa58ec40
R10: 0000000000000f1c R11: 0000000000000001 R12: ffff888093b094e0
R13: ffffea00024ec200 R14: ffff888093b094e2 R15: 0000000000000001
FS:  0000555556ae9940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c00afa0 CR3: 0000000096914000 CR4: 00000000001406e0
Call Trace:
Modules linked in:
---[ end trace b3bbc57662160eaf ]---
RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178
Code: 2b 48 c7 c7 2d 0f 62 88 e8 98 b3 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 2d 0f 62 88 e8 ac b8 07 00 44 89 e1 48 c7 c7 e8 0f
RSP: 0018:ffff888093b09428 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c
RDX: ffff888093b083c0 RSI: 0000000000000000 RDI: ffff888093b094e0
RBP: ffff888093b09478 R08: 0000000000000002 R09: ffff8880aa58ec40
R10: 0000000000000f1c R11: 0000000000000001 R12: ffff888093b094e0
R13: ffffea00024ec200 R14: ffff888093b094e2 R15: 0000000000000001
FS:  0000555556ae9940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c00afa0 CR3: 0000000096914000 CR4: 00000000001406e0