================================================================== BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1579 Read of size 8 at addr ffff88807b4bdd50 by task syz-executor.5/10731 CPU: 1 PID: 10731 Comm: syz-executor.5 Not tainted 5.2.0+ #67 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: Allocated by task 0: (stack is not available) Freed by task 2171766330: 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: 1 PID: 10731 Comm: syz-executor.5 Not tainted 5.2.0+ #67 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:ffff88807b4bdb38 EFLAGS: 00010006 RAX: 00000000001fffff RBX: ffff88807b4bdf4c RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88807b4bdb40 RDI: 0000000000003ff0 RBP: ffff88807b4bdb58 R08: 000000000000001c R09: ffffed1015d244fa R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffea0001ed2f00 R13: ffff88807b4bdd50 R14: ffff8880aa400c40 R15: ffff88807b4bdf40 FS: 00005555570bb940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8c294258 CR3: 000000008ecfb000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Modules linked in: CR2: ffffffff8c294258 ---[ end trace eab9ba98f7bd95f7 ]--- 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:ffff88807b4bdb38 EFLAGS: 00010006 RAX: 00000000001fffff RBX: ffff88807b4bdf4c RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88807b4bdb40 RDI: 0000000000003ff0 RBP: ffff88807b4bdb58 R08: 000000000000001c R09: ffffed1015d244fa R10: ffffed1015d244f9 R11: ffff8880ae9227cf R12: ffffea0001ed2f00 R13: ffff88807b4bdd50 R14: ffff8880aa400c40 R15: ffff88807b4bdf40 FS: 00005555570bb940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8c294258 CR3: 000000008ecfb000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400