syzbot

BUG: memory leak
unreferenced object 0xffff888110099d60 (size 32):
  comm "syz-executor039", pid 8471, jiffies 4294941625 (age 13.130s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 30 00 00 00 00 00 00 00 00 00 00 00  loop0...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000000d91ef28>] kstrdup+0x36/0x70 mm/util.c:60
    [<00000000374f3354>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<0000000019cab445>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<000000004bc23da4>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<0000000071d5c2f9>] kobject_add_varg lib/kobject.c:384 [inline]
    [<0000000071d5c2f9>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473
    [<0000000074a17ad4>] nilfs_sysfs_create_device_group+0x98/0x3a0 fs/nilfs2/sysfs.c:999
    [<000000005e8eb26c>] init_nilfs+0x523/0x680 fs/nilfs2/the_nilfs.c:637
    [<000000007e3569de>] nilfs_fill_super fs/nilfs2/super.c:1046 [inline]
    [<000000007e3569de>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1316
    [<000000008bb9b08a>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:592
    [<00000000e6acc6d2>] vfs_get_tree+0x28/0x100 fs/super.c:1549
    [<000000008b4f9896>] do_new_mount fs/namespace.c:2875 [inline]
    [<000000008b4f9896>] path_mount+0xc5e/0x1170 fs/namespace.c:3205
    [<000000005c9be66c>] do_mount fs/namespace.c:3218 [inline]
    [<000000005c9be66c>] __do_sys_mount fs/namespace.c:3426 [inline]
    [<000000005c9be66c>] __se_sys_mount fs/namespace.c:3403 [inline]
    [<000000005c9be66c>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3403
    [<0000000087200211>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000cff0d38e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9