==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88807a8d8ec0 by task syz-executor.2/9054

CPU: 0 PID: 9054 Comm: syz-executor.2 Not tainted 5.2.0-rc5+ #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2478481536:
BUG: unable to handle page fault for address: ffffffff8c210fe0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8c70067 P4D 8c70067 PUD 8c71063 PMD 0 
Thread overran stack, or stack corrupted
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9054 Comm: syz-executor.2 Not tainted 5.2.0-rc5+ #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:stack_depot_fetch+0x10/0x30 lib/stackdepot.c:203
Code: e9 7b fd ff ff 4c 89 ff e8 bd c4 62 fe e9 e6 fd ff ff 90 90 90 90 90 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 e0 cb 24 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff88807a8d8c08 EFLAGS: 00010006
RAX: 00000000001f8880 RBX: ffff88807a8d9584 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88807a8d8c10 RDI: 0000000000003ff0
RBP: ffff88807a8d8c28 R08: 0000000000000020 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffea0001ea3600
R13: ffff88807a8d8ec0 R14: ffff8880aa400dc0 R15: ffff88807a8d9580
FS:  0000555556542940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c210fe0 CR3: 000000009567f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: ffffffff8c210fe0
---[ end trace 7f905848ed83c9c7 ]---
RIP: 0010:stack_depot_fetch+0x10/0x30 lib/stackdepot.c:203
Code: e9 7b fd ff ff 4c 89 ff e8 bd c4 62 fe e9 e6 fd ff ff 90 90 90 90 90 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 e0 cb 24 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff88807a8d8c08 EFLAGS: 00010006
RAX: 00000000001f8880 RBX: ffff88807a8d9584 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88807a8d8c10 RDI: 0000000000003ff0
RBP: ffff88807a8d8c28 R08: 0000000000000020 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffea0001ea3600
R13: ffff88807a8d8ec0 R14: ffff8880aa400dc0 R15: ffff88807a8d9580
FS:  0000555556542940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c210fe0 CR3: 000000009567f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400