BUG: memory leak
unreferenced object 0xffff88800ce9de40 (size 32):
  comm "syz-executor.5", pid 77081, jiffies 4298176386 (age 26.928s)
  hex dump (first 32 bytes):
    39 70 2d 66 63 61 6c 6c 2d 63 61 63 68 65 2d 32  9p-fcall-cache-2
    36 33 00 00 00 00 00 00 00 00 00 00 00 00 00 00  63..............
  backtrace:
    [<00000000892d8967>] kstrdup+0x36/0x70 mm/util.c:60
    [<00000000e7640c13>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<00000000909c55f3>] kvasprintf_const+0x10c/0x1a0 lib/kasprintf.c:48
    [<00000000012f99d0>] kobject_set_name_vargs+0x56/0x150 lib/kobject.c:297
    [<000000007305e965>] kobject_add_varg lib/kobject.c:392 [inline]
    [<000000007305e965>] kobject_init_and_add+0xc9/0x160 lib/kobject.c:481
    [<0000000080619d6e>] sysfs_slab_add+0x172/0x200 mm/slub.c:5626
    [<00000000f481f806>] __kmem_cache_create+0x3db/0x520 mm/slub.c:4445
    [<00000000cd40f5d4>] create_cache mm/slab_common.c:255 [inline]
    [<00000000cd40f5d4>] kmem_cache_create_usercopy+0x1db/0x2f0 mm/slab_common.c:350
    [<00000000d30d2502>] p9_client_create+0xc6a/0x1230 net/9p/client.c:1074
    [<00000000c3b3580d>] v9fs_session_init+0x1dd/0x1680 fs/9p/v9fs.c:406
    [<000000001f724559>] v9fs_mount+0x79/0x8f0 fs/9p/vfs_super.c:126
    [<00000000c7be28b7>] legacy_get_tree+0x105/0x220 fs/fs_context.c:593
    [<000000009f0c8cd0>] vfs_get_tree+0x8e/0x300 fs/super.c:1572
    [<000000003cf9820b>] do_new_mount fs/namespace.c:2917 [inline]
    [<000000003cf9820b>] path_mount+0x1429/0x2120 fs/namespace.c:3247
    [<000000002051e294>] do_mount fs/namespace.c:3260 [inline]
    [<000000002051e294>] __do_sys_mount fs/namespace.c:3468 [inline]
    [<000000002051e294>] __se_sys_mount fs/namespace.c:3445 [inline]
    [<000000002051e294>] __x64_sys_mount+0x282/0x300 fs/namespace.c:3445
    [<00000000cbf3b783>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46

BUG: leak checking failed