BUG: memory leak
unreferenced object 0xffff88800cd37140 (size 32):
  comm "syz-executor.7", pid 21546, jiffies 4296595425 (age 32.698s)
  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
    31 33 00 0c 80 88 ff ff 00 00 00 00 00 00 00 00  13..............
  backtrace:
    [<00000000ae16a10b>] kstrdup+0x36/0x70 mm/util.c:60
    [<00000000b0149670>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<00000000b4ee7923>] kvasprintf_const+0x10c/0x1a0 lib/kasprintf.c:48
    [<00000000fa61578f>] kobject_set_name_vargs+0x56/0x150 lib/kobject.c:297
    [<00000000c15d5820>] kobject_add_varg lib/kobject.c:392 [inline]
    [<00000000c15d5820>] kobject_init_and_add+0xc9/0x160 lib/kobject.c:481
    [<00000000b86999ce>] sysfs_slab_add+0x172/0x200 mm/slub.c:5626
    [<00000000fd1cd420>] __kmem_cache_create+0x3db/0x520 mm/slub.c:4445
    [<0000000068d7681f>] create_cache mm/slab_common.c:255 [inline]
    [<0000000068d7681f>] kmem_cache_create_usercopy+0x1db/0x2f0 mm/slab_common.c:350
    [<000000008e736f4c>] p9_client_create+0xc6a/0x1230 net/9p/client.c:1074
    [<00000000ba8ce3db>] v9fs_session_init+0x1dd/0x1680 fs/9p/v9fs.c:406
    [<00000000fa744242>] v9fs_mount+0x79/0x8f0 fs/9p/vfs_super.c:126
    [<00000000675194cb>] legacy_get_tree+0x105/0x220 fs/fs_context.c:593
    [<000000007f1cddbc>] vfs_get_tree+0x8e/0x300 fs/super.c:1572
    [<00000000c532ad8c>] do_new_mount fs/namespace.c:2919 [inline]
    [<00000000c532ad8c>] path_mount+0x1331/0x21c0 fs/namespace.c:3249
    [<00000000379ed25a>] do_mount fs/namespace.c:3262 [inline]
    [<00000000379ed25a>] __do_sys_mount fs/namespace.c:3470 [inline]
    [<00000000379ed25a>] __se_sys_mount fs/namespace.c:3447 [inline]
    [<00000000379ed25a>] __x64_sys_mount+0x282/0x300 fs/namespace.c:3447
    [<0000000009ec2d17>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46

BUG: leak checking failed