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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 /kernel/locking/lockdep.c:1579
Read of size 8 at addr ffff888097838840 by task syz-executor.4/9239

CPU: 0 PID: 9239 Comm: syz-executor.4 Not tainted 5.2.0-next-20190718 #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2250754944:
usercopy: Kernel memory overwrite attempt detected to SLAB object 'kmalloc-4k' (offset 4272, size 2)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:98!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9239 Comm: syz-executor.4 Not tainted 5.2.0-next-20190718 #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 7b 06 be ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c 89 ee 48 c7 c7 60 51 96 87 ff 75 d0 41 57 e8 3b a9 a7 ff <0f> 0b e8 50 06 be ff e8 7b 39 f8 ff 8b 55 d4 4c 89 e1 49 89 d8 4c
RSP: 0018:ffff888097837508 EFLAGS: 00010086
RAX: 0000000000000068 RBX: ffffffff8888b7c5 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815c3a26 RDI: ffffed1012f06e93
RBP: ffff888097837560 R08: 0000000000000068 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffffff8888f40d
R13: ffffffff87964fc0 R14: ffffffff87964f00 R15: ffffffff87964ec0
FS:  0000555555a11940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c297218 CR3: 0000000097e0e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
---[ end trace bbed14c8a9958d07 ]---
RIP: 0010:usercopy_abort+0xbd/0xbf /mm/usercopy.c:98
Code: c0 e8 7b 06 be ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c 89 ee 48 c7 c7 60 51 96 87 ff 75 d0 41 57 e8 3b a9 a7 ff <0f> 0b e8 50 06 be ff e8 7b 39 f8 ff 8b 55 d4 4c 89 e1 49 89 d8 4c
RSP: 0018:ffff888097837508 EFLAGS: 00010086
RAX: 0000000000000068 RBX: ffffffff8888b7c5 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815c3a26 RDI: ffffed1012f06e93
RBP: ffff888097837560 R08: 0000000000000068 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffffff8888f40d
R13: ffffffff87964fc0 R14: ffffffff87964f00 R15: ffffffff87964ec0
FS:  0000555555a11940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c297218 CR3: 0000000097e0e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400