BUG: memory leak
unreferenced object 0xffff88800afa73a0 (size 16):
  comm "syz-executor.2", pid 32019, jiffies 4297746329 (age 17.890s)
  hex dump (first 16 bytes):
    b8 c2 b9 44 80 88 ff ff 00 80 27 33 80 88 ff ff  ...D......'3....
  backtrace:
    [<00000000c8c82d82>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000c8c82d82>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<000000006049a527>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<000000005784a71f>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000a61f8c7d>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<0000000035f3e795>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000c4173640>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000c4173640>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000001cc5b243>] do_mount fs/namespace.c:3224 [inline]
    [<000000001cc5b243>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000001cc5b243>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000001cc5b243>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<000000001317972b>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<0000000058581269>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed