BUG: memory leak
unreferenced object 0xffff88800f72e040 (size 32):
  comm "syz-executor.4", pid 13393, jiffies 4297826644 (age 20.037s)
  hex dump (first 32 bytes):
    39 70 2d 66 63 61 6c 6c 2d 63 61 63 68 65 2d 37  9p-fcall-cache-7
    33 37 00 0f 80 88 ff ff 11 00 00 00 00 00 00 00  37..............
  backtrace:
    [<00000000daf9597a>] kstrdup+0x36/0x70 mm/util.c:60
    [<000000000d6d165c>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<00000000a6b47e61>] kvasprintf_const+0x10c/0x1a0 lib/kasprintf.c:48
    [<00000000ff1e152f>] kobject_set_name_vargs+0x56/0x150 lib/kobject.c:297
    [<000000008caec3fe>] kobject_add_varg lib/kobject.c:392 [inline]
    [<000000008caec3fe>] kobject_init_and_add+0xc9/0x160 lib/kobject.c:481
    [<000000007c6951a6>] sysfs_slab_add+0x172/0x200 mm/slub.c:5631
    [<000000007eaf4cec>] __kmem_cache_create+0x3db/0x520 mm/slub.c:4450
    [<00000000f12b67c6>] create_cache mm/slab_common.c:255 [inline]
    [<00000000f12b67c6>] kmem_cache_create_usercopy+0x1db/0x2f0 mm/slab_common.c:350
    [<000000003d32e3d5>] p9_client_create+0xc6a/0x1230 net/9p/client.c:1074
    [<000000001fd0c2fd>] v9fs_session_init+0x1dd/0x1680 fs/9p/v9fs.c:406
    [<00000000d16edf8d>] v9fs_mount+0x79/0x8f0 fs/9p/vfs_super.c:126
    [<00000000ca318ba0>] legacy_get_tree+0x105/0x220 fs/fs_context.c:593
    [<000000000a02d961>] vfs_get_tree+0x8e/0x300 fs/super.c:1572
    [<00000000c8170e79>] do_new_mount fs/namespace.c:3006 [inline]
    [<00000000c8170e79>] path_mount+0x1490/0x21e0 fs/namespace.c:3336
    [<0000000007c47817>] do_mount fs/namespace.c:3349 [inline]
    [<0000000007c47817>] __do_sys_mount fs/namespace.c:3557 [inline]
    [<0000000007c47817>] __se_sys_mount fs/namespace.c:3534 [inline]
    [<0000000007c47817>] __x64_sys_mount+0x282/0x300 fs/namespace.c:3534
    [<00000000cabbd998>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46

BUG: leak checking failed