==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88808a8ecfb0 by task syz-executor.0/9243

CPU: 1 PID: 9243 Comm: syz-executor.0 Not tainted 5.2.0-rc6+ #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2324616200:
BUG: unable to handle page fault for address: ffffffff8c015f20
#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: 9243 Comm: syz-executor.0 Not tainted 5.2.0-rc6+ #76
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 ed d9 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 20 1b 05 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff88808a8eccf8 EFLAGS: 00010006
RAX: 00000000001f8880 RBX: ffff88808a8ed344 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88808a8ecd00 RDI: 0000000000003ff0
RBP: ffff88808a8ecd18 R08: 0000000000000020 R09: ffffed1015d244fa
R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffea00022a3b00
R13: ffff88808a8ecfb0 R14: ffff8880aa400dc0 R15: ffff88808a8ed340
FS:  00005555559c5940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c015f20 CR3: 00000000947e4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: ffffffff8c015f20
---[ end trace b3507c9160c5d3f6 ]---
RIP: 0010:stack_depot_fetch+0x10/0x30 lib/stackdepot.c:203
Code: e9 7b fd ff ff 4c 89 ff e8 ed d9 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 20 1b 05 8b 48 8d 47 18 48 89 06 8b 47 0c c3 0f 1f 00
RSP: 0018:ffff88808a8eccf8 EFLAGS: 00010006
RAX: 00000000001f8880 RBX: ffff88808a8ed344 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88808a8ecd00 RDI: 0000000000003ff0
RBP: ffff88808a8ecd18 R08: 0000000000000020 R09: ffffed1015d244fa
R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffea00022a3b00
R13: ffff88808a8ecfb0 R14: ffff8880aa400dc0 R15: ffff88808a8ed340
FS:  00005555559c5940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8c015f20 CR3: 00000000947e4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400