==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff888094584b90 by task syz-executor.2/8765

CPU: 1 PID: 8765 Comm: syz-executor.2 Not tainted 5.2.0-rc4+ #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 330893582:
BUG: unable to handle page fault for address: ffffffff8c03f420
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8a70067 P4D 8a70067 PUD 8a71063 PMD 0 
Thread overran stack, or stack corrupted
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8765 Comm: syz-executor.2 Not tainted 5.2.0-rc4+ #33
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 6d b0 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 a0 6b 04 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff8880945848d8 EFLAGS: 00010006
RAX: 00000000001ff110 RBX: ffff888094585084 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880945848e0 RDI: 0000000000000ff0
RBP: ffff8880945848f8 R08: 000000000000001f R09: ffffed1015d244fa
R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffea0002516100
R13: ffff888094584b90 R14: ffff8880aa594c40 R15: ffff888094585080
FS:  0000555555e60940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c03f420 CR3: 000000008a0cd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: ffffffff8c03f420
---[ end trace f7e63f12739a610f ]---
RIP: 0010:stack_depot_fetch+0x10/0x30 lib/stackdepot.c:203
Code: e9 7b fd ff ff 4c 89 ff e8 6d b0 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 a0 6b 04 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff8880945848d8 EFLAGS: 00010006
RAX: 00000000001ff110 RBX: ffff888094585084 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880945848e0 RDI: 0000000000000ff0
RBP: ffff8880945848f8 R08: 000000000000001f R09: ffffed1015d244fa
R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffea0002516100
R13: ffff888094584b90 R14: ffff8880aa594c40 R15: ffff888094585080
FS:  0000555555e60940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c03f420 CR3: 000000008a0cd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400