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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 ffff88808601f1a0 by task syz-executor.1/10371

CPU: 0 PID: 10371 Comm: syz-executor.1 Not tainted 5.2.0-rc4+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 9639:
 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_slab_alloc+0xf/0x20 mm/kasan/common.c:497
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc_node mm/slab.c:3269 [inline]
 kmem_cache_alloc_node+0x131/0x710 mm/slab.c:3579
 __alloc_skb+0xd5/0x5e0 net/core/skbuff.c:194
 alloc_skb include/linux/skbuff.h:1054 [inline]
 netlink_dump+0x312/0xfb0 net/netlink/af_netlink.c:2223
 netlink_recvmsg+0xb9f/0xf10 net/netlink/af_netlink.c:2005
 sock_recvmsg_nosec net/socket.c:877 [inline]
 sock_recvmsg net/socket.c:894 [inline]
 sock_recvmsg+0xce/0x110 net/socket.c:890
 ___sys_recvmsg+0x271/0x5a0 net/socket.c:2448
 __sys_recvmsg+0x102/0x1d0 net/socket.c:2497
 __do_sys_recvmsg net/socket.c:2507 [inline]
 __se_sys_recvmsg net/socket.c:2504 [inline]
 __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2504
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9639:
 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]
 kmem_cache_free+0x86/0x260 mm/slab.c:3698
 kfree_skbmem net/core/skbuff.c:620 [inline]
 kfree_skbmem+0xc5/0x150 net/core/skbuff.c:614
 __kfree_skb net/core/skbuff.c:677 [inline]
 consume_skb net/core/skbuff.c:736 [inline]
 consume_skb+0xea/0x380 net/core/skbuff.c:730
 skb_free_datagram+0x1b/0x100 net/core/datagram.c:328
 netlink_recvmsg+0x6c6/0xf10 net/netlink/af_netlink.c:2001
 sock_recvmsg_nosec net/socket.c:877 [inline]
 sock_recvmsg net/socket.c:894 [inline]
 sock_recvmsg+0xce/0x110 net/socket.c:890
 ___sys_recvmsg+0x271/0x5a0 net/socket.c:2448
 __sys_recvmsg+0x102/0x1d0 net/socket.c:2497
 __do_sys_recvmsg net/socket.c:2507 [inline]
 __se_sys_recvmsg net/socket.c:2504 [inline]
 __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2504
 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 ffff88808601f080
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 64 bytes to the right of
 224-byte region [ffff88808601f080, ffff88808601f160)
The buggy address belongs to the page:
page:ffffea00021807c0 refcount:1 mapcount:0 mapping:ffff88821baabb40 index:0xffff88808601fe40
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002676008 ffffea000267c048 ffff88821baabb40
raw: ffff88808601fe40 ffff88808601f080 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808601f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808601f100: fb fb fb fb fb fb f1 f1 f1 f1 00 f2 f2 f2 00 f2
>ffff88808601f180: f2 f2 fc fc fc fc 00 00 00 f3 f3 f3 f3 f3 fb fb
                               ^
 ffff88808601f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808601f280: fb fb fb fb fc 00 00 00 00 00 00 00 00 fc fc fc
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