[wp-trac] [WordPress Trac] #30802: General settings menu isn't opened.

[WordPress Trac]

#30802: General settings menu isn't opened.
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 Reporter:  hyoseop       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  4.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 After upgrading to 4.1, I can't open General menu in Settings. When I
 click General menu, the server don't reply. The file of this menu is
 options-general.php. And below is the path of tracing a reason.

 wp-admin/options-general.php
  - 356 : wp_can_install_language_pack()

 wp-admin/include/translation-install.php
  - 233 : fs_connect( array( WP_CONTENT_DIR, WP_LANG_DIR ) )

 wp-admin/include/class-wp-upgrader.php
  - 193 : $wp_filesystem->find_folder($dir)

 wp-admin/include/class-wp-filesystem-base.php
  - 273 : search_for_folder($folder)
  - 293 : trailingslashit($this->cwd()); ====> $this->cwd() is defined to
 return false always at 525 line.
  - 1661 : untrailingslashit( $string ) . '/';
  - 1667 : rtrim( $string, '/\\' );             ====> $string isn't string.
 It is boolean value 'false'.

 I can't find where rtrim is defined. But it is clear rtrim must have a
 string variable as first input. In this case, rtrim gets boolean value
 'false' as $string. This makes server blocked. If I remove this
 function(This means skipping this.), the general settings screen is shown
 properly. And I don't know why a boolean value is given as a first string
 variable.

 Why rtrim gets a boolean value as a first string variable?
 If it is a root reason, how do I fix this problem?

 If you want to see the problem, visit here.
 http://칭기즈칸.한국/
 And general settings path is below.
 http://칭기즈칸.한국/wp-admin/options-general.php

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Ticket URL: <https://core.trac.wordpress.org/ticket/30802>
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