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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff888095f7b870 by task syz-executor.3/11076

CPU: 0 PID: 11076 Comm: syz-executor.3 Not tainted 5.2.0-rc3+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 10668:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503
 __do_kmalloc mm/slab.c:3660 [inline]
 __kmalloc+0x15c/0x740 mm/slab.c:3669
 kmalloc include/linux/slab.h:552 [inline]
 map_update_elem kernel/bpf/syscall.c:913 [inline]
 __do_sys_bpf+0x289b/0x42c0 kernel/bpf/syscall.c:2818
 __se_sys_bpf kernel/bpf/syscall.c:2789 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2789
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 10668:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
 __cache_free mm/slab.c:3432 [inline]
 kfree+0xcf/0x220 mm/slab.c:3755
 map_update_elem kernel/bpf/syscall.c:972 [inline]
 __do_sys_bpf+0x2bf5/0x42c0 kernel/bpf/syscall.c:2818
 __se_sys_bpf kernel/bpf/syscall.c:2789 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2789
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888095f7b840
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes to the right of
 32-byte region [ffff888095f7b840, ffff888095f7b860)
The buggy address belongs to the page:
page:ffffea000257dec0 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff888095f7bfc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00029e7408 ffffea00027e8708 ffff8880aa4001c0
raw: ffff888095f7bfc1 ffff888095f7b000 0000000100000030 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888095f7b700: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
 ffff888095f7b780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff888095f7b800: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 fc fc fc fc
                                                             ^
 ffff888095f7b880: 00 00 00 f3 f3 f3 f3 f3 fb fb fb fb fc fc fc fc
 ffff888095f7b900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc 00
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