==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1579
Read of size 8 at addr ffff88808d37f3f0 by task syz-executor.4/9265

CPU: 0 PID: 9265 Comm: syz-executor.4 Not tainted 5.2.0+ #97
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2250688752:
BUG: unable to handle page fault for address: ffffffff8c294258
#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: 9265 Comm: syz-executor.4 Not tainted 5.2.0+ #97
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: ff ff 48 c7 c7 10 f0 d2 88 e8 ac 2b 5d fe e9 d7 fe ff ff 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 60 42 29 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff88808d37f1d8 EFLAGS: 00010006
RAX: 00000000001fffff RBX: ffff88808d37fc04 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88808d37f1e0 RDI: 0000000000003ff0
RBP: ffff88808d37f1f8 R08: 0000000000000020 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffea000234df80
R13: ffff88808d37f3f0 R14: ffff8880aa402000 R15: ffff88808d37fc00
FS:  0000555556823940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c294258 CR3: 0000000099e82000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: ffffffff8c294258
---[ end trace ee28e9ccdf6bc88d ]---
RIP: 0010:stack_depot_fetch+0x10/0x30 lib/stackdepot.c:203
Code: ff ff 48 c7 c7 10 f0 d2 88 e8 ac 2b 5d fe e9 d7 fe ff ff 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 60 42 29 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff88808d37f1d8 EFLAGS: 00010006
RAX: 00000000001fffff RBX: ffff88808d37fc04 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88808d37f1e0 RDI: 0000000000003ff0
RBP: ffff88808d37f1f8 R08: 0000000000000020 R09: ffffed1015d044fa
R10: ffffed1015d044f9 R11: ffff8880ae8227cf R12: ffffea000234df80
R13: ffff88808d37f3f0 R14: ffff8880aa402000 R15: ffff88808d37fc00
FS:  0000555556823940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c294258 CR3: 0000000099e82000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400