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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 ffff888098bf5d80 by task syz-executor.3/9742

CPU: 1 PID: 9742 Comm: syz-executor.3 Not tainted 5.2.0-rc5+ #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2170204341:
usercopy: Kernel memory overwrite attempt detected to SLAB object 'kmalloc-512' (offset 520, size 1)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:98!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9742 Comm: syz-executor.3 Not tainted 5.2.0-rc5+ #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:usercopy_abort+0xbd/0xbf mm/usercopy.c:98
Code: c0 e8 88 2e bf ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c 89 ee 48 c7 c7 40 c9 95 87 ff 75 d0 41 57 e8 b8 32 a9 ff <0f> 0b e8 5d 2e bf ff e8 58 64 f8 ff 8b 55 d4 4c 89 e1 49 89 d8 4c
RSP: 0018:ffff888098bf55d0 EFLAGS: 00010082
RAX: 0000000000000068 RBX: ffffffff88824513 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ad926 RDI: ffffed101317eaac
RBP: ffff888098bf5628 R08: 0000000000000068 R09: ffffed1015d244fa
R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffffff888280f5
R13: ffffffff8795c7a0 R14: ffffffff8795c6e0 R15: ffffffff8795c6a0
FS:  00005555560c7940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c24cbd8 CR3: 000000008e288000 CR4: 00000000001406e0
Call Trace:
Modules linked in:
---[ end trace cdfa73d727002b28 ]---
RIP: 0010:usercopy_abort+0xbd/0xbf mm/usercopy.c:98
Code: c0 e8 88 2e bf ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c 89 ee 48 c7 c7 40 c9 95 87 ff 75 d0 41 57 e8 b8 32 a9 ff <0f> 0b e8 5d 2e bf ff e8 58 64 f8 ff 8b 55 d4 4c 89 e1 49 89 d8 4c
RSP: 0018:ffff888098bf55d0 EFLAGS: 00010082
RAX: 0000000000000068 RBX: ffffffff88824513 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ad926 RDI: ffffed101317eaac
RBP: ffff888098bf5628 R08: 0000000000000068 R09: ffffed1015d244fa
R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffffff888280f5
R13: ffffffff8795c7a0 R14: ffffffff8795c6e0 R15: ffffffff8795c6a0
FS:  00005555560c7940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c24cbd8 CR3: 000000008e288000 CR4: 00000000001406e0