This is the mail archive of the
gdb-prs@sources.redhat.com
mailing list for the GDB project.
gdb/1706: multithreaded application debug fails on GNU/Linux + gcc + c/c++
- From: jari dot lappalainen at iki dot fi
- To: gdb-gnats at sources dot redhat dot com
- Date: 7 Jul 2004 12:26:00 -0000
- Subject: gdb/1706: multithreaded application debug fails on GNU/Linux + gcc + c/c++
- Reply-to: jari dot lappalainen at iki dot fi
>Number: 1706
>Category: gdb
>Synopsis: multithreaded application debug fails on GNU/Linux + gcc + c/c++
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Jul 07 12:28:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator: jari.lappalainen@iki.fi
>Release: GNU gdb 6.1.1
>Organization:
>Environment:
Linux 2.6.3-4mdk i686 GNU/Linux
gcc 3.4.1 (Thread model: posix)
gdb configured as "i686-pc-linux-gnu"
Using host libthread_db library "/lib/tls/libthread_db.so.1".
>Description:
The attached program runs fine on its own. Under gdb it
runs for a while, then gdb reports
Couldn't get registers: No such process.
When gdb is quit at this points gdb reports
Quitting: thread_db get_info: cannot get thread info: generic error
>How-To-Repeat:
Compile the attached thread.c with
gcc -Wall -g -lpthread thread.cpp
and start in gdb without any command line arguments.
gdb ./a.out
After a couple of seconds (program sleeps for a while)
the error message appears.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="thread.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="thread.c"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==