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From: "linjy0410 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/29567] New: when `dlopen` glibc itself, it needs
 `__ctype_init`
Date: Tue, 13 Sep 2022 08:17:57 +0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: dynamic-link
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X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: linjy0410 at gmail dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29567

            Bug ID: 29567
           Summary: when `dlopen` glibc itself, it needs `__ctype_init`
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: linjy0410 at gmail dot com
  Target Milestone: ---

We met an issue that while `dlopen("libc.so.6")` and using dlsym to call the
functions inside, some will crash because of ctype TLS is not initialized, =
e.g.
`iconv` that uses `isspace` which would access ctype.
By manual dlsym and calling `__ctype_init`, it can work normally.
I'm not sure whether this is a bug or dlopen a glibc is not intended.

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