BUG: memory leak
unreferenced object 0xffff888016341cc0 (size 16):
  comm "syz-executor.0", pid 22263, jiffies 4296945563 (age 21.322s)
  hex dump (first 16 bytes):
    28 f8 c6 44 80 88 ff ff 00 c0 a0 56 80 88 ff ff  (..D.......V....
  backtrace:
    [<00000000caa967e0>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000caa967e0>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<0000000078ea909e>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<000000006aeb4ff1>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<000000003b12f000>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<00000000ada20f0b>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<0000000010fca0ba>] do_new_mount fs/namespace.c:2881 [inline]
    [<0000000010fca0ba>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<00000000eb2536f7>] do_mount fs/namespace.c:3224 [inline]
    [<00000000eb2536f7>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<00000000eb2536f7>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<00000000eb2536f7>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000062ca72f>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000cb6f9936>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed