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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/27054] New: pthread_atfork handlers that call
 pthread_atfork deadlock
Date: Fri, 11 Dec 2020 15:26:24 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27054

            Bug ID: 27054
           Summary: pthread_atfork handlers that call pthread_atfork
                    deadlock
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
             Flags: security-

Some applications call pthread_atfork from a pthread_atfork handler in the =
new
subprocess because POSIX does not specify that the handlers are duplicated =
by
fork. With the current implementation, this results in a deadlock. We must =
not
call pthread_atfork handlers while holding implementation locks.

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