BUG: memory leak
unreferenced object 0xffff8880496dc8e0 (size 16):
  comm "syz-executor.3", pid 7126, jiffies 4295307701 (age 15.411s)
  hex dump (first 16 bytes):
    28 78 a1 20 80 88 ff ff 00 20 a6 47 80 88 ff ff  (x. ..... .G....
  backtrace:
    [<0000000036a02457>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000036a02457>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<0000000056716e47>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<0000000059d9fc7d>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000f348aad4>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<000000008121264d>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<00000000c312c1da>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000c312c1da>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000001fad6f2c>] do_mount fs/namespace.c:3224 [inline]
    [<000000001fad6f2c>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000001fad6f2c>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000001fad6f2c>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<00000000259c96bf>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000f245349f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed