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Date:      Mon, 29 Jun 2015 18:43:43 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ports-bugs@FreeBSD.org
Subject:   [Bug 201207] devel/gdb: Duplicate thread listing when attaching to running multithreaded program
Message-ID:  <bug-201207-13@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201207

            Bug ID: 201207
           Summary: devel/gdb: Duplicate thread listing when attaching to
                    running multithreaded program
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs@FreeBSD.org
          Reporter: eric@badgerio.us
                CC: luca.pizzamiglio@gmail.com
             Flags: maintainer-feedback?(luca.pizzamiglio@gmail.com)
                CC: luca.pizzamiglio@gmail.com

Created attachment 158169
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158169&action=edit
Simple 2 threaded program

This was discussed somewhat in Bug 201149, but not fully resolved there, so I'm
writing up this PR to keep track of the issue. 

Attaching to a program with multiple threads results in a duplicate listing
like below:

(gdb) info threads
  Id   Target Id         Frame 
  3    Thread 801406400 (LWP 101466 main) 0x0000000800b648ba in nanosleep ()
from /lib/libc.so.7
* 2    Thread 801406800 (LWP 100123 otherthread) 0x0000000800b648ba in
nanosleep () from /lib/libc.so.7
* 1    Thread 801406800 (LWP 100123 otherthread) 0x0000000800b648ba in
nanosleep () from /lib/libc.so.7

Attached the test program used for the above demonstration.

I proposed a patch in Bug 201149, but it sounds like jhb@ has a more complete
patch.

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