==================================================================
BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
Read of size 8 at addr ffff8880976bd440 by task syz-executor.2/13314

CPU: 1 PID: 13314 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
 bfs_create+0xfb/0x610 fs/bfs/dir.c:91
 lookup_open+0x893/0x1a20 fs/namei.c:3235
 do_last fs/namei.c:3327 [inline]
 path_openat+0x1094/0x2df0 fs/namei.c:3537
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fbcd89050f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbcd6e77168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fbcd8a24f80 RCX: 00007fbcd89050f9
RDX: 0000000000000000 RSI: 00000000000000f0 RDI: 0000000020000100
RBP: 00007fbcd8960ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd98a22f4f R14: 00007fbcd6e77300 R15: 0000000000022000

Allocated by task 13314:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 bfs_fill_super+0x447/0xec0 fs/bfs/inode.c:363
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 12194:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 kvfree+0x59/0x60 mm/util.c:452
 __vunmap+0x2a5/0x3f0 mm/vmalloc.c:1534
 vfree+0x65/0x100 mm/vmalloc.c:1598
 netlink_skb_destructor+0xc0/0x200 net/netlink/af_netlink.c:375
 skb_release_head_state+0x158/0x2c0 net/core/skbuff.c:625
 skb_release_all net/core/skbuff.c:638 [inline]
 __kfree_skb net/core/skbuff.c:654 [inline]
 consume_skb+0xda/0x3d0 net/core/skbuff.c:714
 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline]
 netlink_unicast+0x4dd/0x690 net/netlink/af_netlink.c:1351
 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 sock_no_sendpage+0xf5/0x140 net/core/sock.c:2686
 kernel_sendpage net/socket.c:3585 [inline]
 sock_sendpage+0xdf/0x140 net/socket.c:912
 pipe_to_sendpage+0x268/0x330 fs/splice.c:452
 splice_from_pipe_feed fs/splice.c:503 [inline]
 __splice_from_pipe+0x389/0x800 fs/splice.c:627
 splice_from_pipe fs/splice.c:662 [inline]
 generic_splice_sendpage+0xd4/0x140 fs/splice.c:833
 do_splice_from fs/splice.c:852 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1025
 splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980
 do_splice_direct+0x1a7/0x270 fs/splice.c:1068
 do_sendfile+0x550/0xc30 fs/read_write.c:1447
 __do_sys_sendfile64 fs/read_write.c:1508 [inline]
 __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880976bd440
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880976bd440, ffff8880976bd460)
The buggy address belongs to the page:
page:ffffea00025daf40 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880976bdfc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002a20408 ffffea0002cefa08 ffff88813bff01c0
raw: ffff8880976bdfc1 ffff8880976bd000 0000000100000029 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880976bd300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880976bd380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880976bd400: fb fb fb fb fc fc fc fc 07 fc fc fc fc fc fc fc
                                           ^
 ffff8880976bd480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880976bd500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): tunl0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): gre0: link becomes ready