BUG: memory leak
unreferenced object 0xffff888125d286e0 (size 32):
  comm "syz-executor.2", pid 10352, jiffies 4294980274 (age 9.060s)
  hex dump (first 32 bytes):
    00 c0 56 0f 81 88 ff ff 00 98 c0 25 81 88 ff ff  ..V........%....
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<0000000095bb7dc4>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000095bb7dc4>] ext4_multi_mount_protect+0x4a6/0x5d0 fs/ext4/mmp.c:367
    [<00000000e14c72cd>] ext4_fill_super+0x5650/0x5ad0 fs/ext4/super.c:4768
    [<0000000082702d18>] mount_bdev+0x223/0x260 fs/super.c:1366
    [<0000000077b49dbf>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:592
    [<00000000436dedcb>] vfs_get_tree+0x28/0x100 fs/super.c:1496
    [<00000000a36ffd59>] do_new_mount fs/namespace.c:2881 [inline]
    [<00000000a36ffd59>] path_mount+0xc5e/0x1170 fs/namespace.c:3211
    [<000000000092c95b>] do_mount fs/namespace.c:3224 [inline]
    [<000000000092c95b>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000000092c95b>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000000092c95b>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3409
    [<00000000837dfaa5>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<0000000064d0c35b>] entry_SYSCALL_64_after_hwframe+0x44/0xa9