BUG: memory leak
unreferenced object 0xffff88800d3ec4c0 (size 16):
  comm "syz-executor.2", pid 5031, jiffies 4294909047 (age 24.256s)
  hex dump (first 16 bytes):
    70 a5 49 44 80 88 ff ff 00 a0 fe 43 80 88 ff ff  p.ID.......C....
  backtrace:
    [<000000008aaff4a1>] kmalloc include/linux/slab.h:552 [inline]
    [<000000008aaff4a1>] ext4_multi_mount_protect+0x861/0xb20 fs/ext4/mmp.c:367
    [<0000000085db38b1>] ext4_fill_super+0xa20e/0xcf20 fs/ext4/super.c:4774
    [<00000000c022fa85>] mount_bdev+0x331/0x3f0 fs/super.c:1419
    [<00000000b797ba62>] legacy_get_tree+0x105/0x220 fs/fs_context.c:592
    [<0000000020e327ae>] vfs_get_tree+0x8e/0x2f0 fs/super.c:1549
    [<000000001c240d61>] do_new_mount fs/namespace.c:2881 [inline]
    [<000000001c240d61>] path_mount+0x139a/0x2080 fs/namespace.c:3211
    [<000000004f6bbd29>] do_mount fs/namespace.c:3224 [inline]
    [<000000004f6bbd29>] __do_sys_mount fs/namespace.c:3432 [inline]
    [<000000004f6bbd29>] __se_sys_mount fs/namespace.c:3409 [inline]
    [<000000004f6bbd29>] __x64_sys_mount+0x27e/0x300 fs/namespace.c:3409
    [<000000008add86ff>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
    [<00000000c55f11b4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: leak checking failed