BUG: memory leak
unreferenced object 0xffff88800b9b9540 (size 32):
  comm "syz-executor.1", pid 19155, jiffies 4296102440 (age 21.861s)
  hex dump (first 32 bytes):
    39 70 2d 66 63 61 6c 6c 2d 63 61 63 68 65 2d 31  9p-fcall-cache-1
    32 38 00 0b 80 88 ff ff 19 00 00 00 00 00 00 00  28..............
  backtrace:
    [<000000007fbf133b>] kstrdup+0x36/0x70 mm/util.c:60
    [<00000000a3fc0a75>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<0000000070456c91>] kvasprintf_const+0x10c/0x1a0 lib/kasprintf.c:48
    [<00000000a292ef82>] kobject_set_name_vargs+0x56/0x150 lib/kobject.c:297
    [<000000007eb81ad6>] kobject_add_varg lib/kobject.c:392 [inline]
    [<000000007eb81ad6>] kobject_init_and_add+0xc9/0x160 lib/kobject.c:481
    [<00000000793f857f>] sysfs_slab_add+0x172/0x200 mm/slub.c:5626
    [<00000000c8e29548>] __kmem_cache_create+0x3db/0x520 mm/slub.c:4445
    [<00000000621e6633>] create_cache mm/slab_common.c:255 [inline]
    [<00000000621e6633>] kmem_cache_create_usercopy+0x1db/0x2f0 mm/slab_common.c:350
    [<00000000263ae98d>] p9_client_create+0xc6a/0x1230 net/9p/client.c:1074
    [<00000000e251a192>] v9fs_session_init+0x1dd/0x1680 fs/9p/v9fs.c:406
    [<0000000090305803>] v9fs_mount+0x79/0x8f0 fs/9p/vfs_super.c:126
    [<0000000038b6a661>] legacy_get_tree+0x105/0x220 fs/fs_context.c:593
    [<00000000e9a53587>] vfs_get_tree+0x8e/0x300 fs/super.c:1572
    [<00000000649681b8>] do_new_mount fs/namespace.c:2917 [inline]
    [<00000000649681b8>] path_mount+0x1429/0x2120 fs/namespace.c:3247
    [<00000000f7aac3a5>] do_mount fs/namespace.c:3260 [inline]
    [<00000000f7aac3a5>] __do_sys_mount fs/namespace.c:3468 [inline]
    [<00000000f7aac3a5>] __se_sys_mount fs/namespace.c:3445 [inline]
    [<00000000f7aac3a5>] __x64_sys_mount+0x282/0x300 fs/namespace.c:3445
    [<00000000d91f5471>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46

BUG: leak checking failed