BUG: memory leak
unreferenced object 0xffff88801d1b6d00 (size 32):
  comm "syz-executor.5", pid 8246, jiffies 4295910454 (age 19.112s)
  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
    39 30 00 1d 80 88 ff ff 10 00 00 00 00 00 00 00  90..............
  backtrace:
    [<00000000f7017a0e>] kstrdup+0x36/0x70 mm/util.c:60
    [<00000000351af9c0>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<000000002b8b57ad>] kvasprintf_const+0x10c/0x1a0 lib/kasprintf.c:48
    [<000000008d70557b>] kobject_set_name_vargs+0x56/0x150 lib/kobject.c:297
    [<000000008ad0f52c>] kobject_add_varg lib/kobject.c:392 [inline]
    [<000000008ad0f52c>] kobject_init_and_add+0xc9/0x160 lib/kobject.c:481
    [<00000000e119c876>] sysfs_slab_add+0x172/0x200 mm/slub.c:5631
    [<00000000fabf1949>] __kmem_cache_create+0x3db/0x520 mm/slub.c:4450
    [<000000000860c446>] create_cache mm/slab_common.c:255 [inline]
    [<000000000860c446>] kmem_cache_create_usercopy+0x1db/0x2f0 mm/slab_common.c:350
    [<000000001c0c0503>] p9_client_create+0xc6a/0x1230 net/9p/client.c:1074
    [<00000000a0a2fd60>] v9fs_session_init+0x1dd/0x1680 fs/9p/v9fs.c:406
    [<00000000ec6f16b6>] v9fs_mount+0x79/0x8f0 fs/9p/vfs_super.c:126
    [<00000000b88bab92>] legacy_get_tree+0x105/0x220 fs/fs_context.c:593
    [<000000007ad35edb>] vfs_get_tree+0x8e/0x300 fs/super.c:1572
    [<000000001bf1abce>] do_new_mount fs/namespace.c:2997 [inline]
    [<000000001bf1abce>] path_mount+0x1490/0x21e0 fs/namespace.c:3327
    [<00000000b134b3ea>] do_mount fs/namespace.c:3340 [inline]
    [<00000000b134b3ea>] __do_sys_mount fs/namespace.c:3548 [inline]
    [<00000000b134b3ea>] __se_sys_mount fs/namespace.c:3525 [inline]
    [<00000000b134b3ea>] __x64_sys_mount+0x282/0x300 fs/namespace.c:3525
    [<00000000fd8ea51a>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46

BUG: leak checking failed