================================================================== BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527 Read of size 8 at addr ffff88808ce87000 by task syz-executor.3/10294 CPU: 1 PID: 10294 Comm: syz-executor.3 Not tainted 5.2.0-rc5+ #38 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 2333976992: ------------[ cut here ]------------ kernel BUG at mm/slab.c:4178! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 10294 Comm: syz-executor.3 Not tainted 5.2.0-rc5+ #38 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178 Code: 2b 48 c7 c7 ed 0e 62 88 e8 98 b3 07 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 bd 48 01 d0 48 29 c8 4c 39 c0 72 b2 c3 <0f> 0b 48 c7 c7 ed 0e 62 88 e8 ac b8 07 00 44 89 e1 48 c7 c7 a8 0f RSP: 0018:ffff88808ce85068 EFLAGS: 00010046 RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c RDX: ffff88808ce84000 RSI: 0000000000000000 RDI: ffff88808ce85120 RBP: ffff88808ce850b8 R08: 0000000000000002 R09: ffff8880aa58ec40 R10: 0000000000000f1c R11: 0000000000000001 R12: ffff88808ce85120 R13: ffffea000233a100 R14: ffff88808ce85122 R15: 0000000000000001 FS: 0000555556345940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8c046b98 CR3: 00000000a1b80000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Modules linked in: ---[ end trace be9ea9cd3526f059 ]--- RIP: 0010:__check_heap_object+0xa5/0xb3 mm/slab.c:4178 Code: 2b 48 c7 c7 ed 0e 62 88 e8 98 b3 07 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 bd 48 01 d0 48 29 c8 4c 39 c0 72 b2 c3 <0f> 0b 48 c7 c7 ed 0e 62 88 e8 ac b8 07 00 44 89 e1 48 c7 c7 a8 0f RSP: 0018:ffff88808ce85068 EFLAGS: 00010046 RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000000c RDX: ffff88808ce84000 RSI: 0000000000000000 RDI: ffff88808ce85120 RBP: ffff88808ce850b8 R08: 0000000000000002 R09: ffff8880aa58ec40 R10: 0000000000000f1c R11: 0000000000000001 R12: ffff88808ce85120 R13: ffffea000233a100 R14: ffff88808ce85122 R15: 0000000000000001 FS: 0000555556345940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8c046b98 CR3: 00000000a1b80000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400