==================================================================
BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff888088944490 by task syz-executor.1/9261

CPU: 0 PID: 9261 Comm: syz-executor.1 Not tainted 5.2.0-rc3+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2249016928:
usercopy: Kernel memory overwrite attempt detected to SLAB object 'kmalloc-4k' (offset 4232, size 1)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:102!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9261 Comm: syz-executor.1 Not tainted 5.2.0-rc3+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:usercopy_abort+0xbd/0xbf mm/usercopy.c:102
Code: c0 e8 a8 d5 bf ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c 89 ee 48 c7 c7 c0 b5 75 87 ff 75 d0 41 57 e8 b8 e5 a9 ff <0f> 0b e8 7d d5 bf ff e8 a8 6a f8 ff 8b 55 d4 4c 89 e1 49 89 d8 4c
RSP: 0018:ffff888088943ce0 EFLAGS: 00010086
RAX: 0000000000000068 RBX: ffffffff8861c78d RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ac936 RDI: ffffed101112878e
RBP: ffff888088943d38 R08: 0000000000000068 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffffff8862034d
R13: ffffffff8775b420 R14: ffffffff8775b360 R15: ffffffff8775b320
FS:  0000555555674940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c045c18 CR3: 00000000a4c12000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
---[ end trace b33088608aa4f58a ]---
RIP: 0010:usercopy_abort+0xbd/0xbf mm/usercopy.c:102
Code: c0 e8 a8 d5 bf ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c 89 ee 48 c7 c7 c0 b5 75 87 ff 75 d0 41 57 e8 b8 e5 a9 ff <0f> 0b e8 7d d5 bf ff e8 a8 6a f8 ff 8b 55 d4 4c 89 e1 49 89 d8 4c
RSP: 0018:ffff888088943ce0 EFLAGS: 00010086
RAX: 0000000000000068 RBX: ffffffff8861c78d RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ac936 RDI: ffffed101112878e
RBP: ffff888088943d38 R08: 0000000000000068 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffffff8862034d
R13: ffffffff8775b420 R14: ffffffff8775b360 R15: ffffffff8775b320
FS:  0000555555674940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c045c18 CR3: 00000000a4c12000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400