[Bug c++/15397] New: GDB fails on fork with exec* or posix-spawn*

[Bug c++/15397] New: GDB fails on fork with exec* or posix-spawn*

[speedaemon1 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15397

             Bug #: 15397
           Summary: GDB fails on fork with exec* or posix-spawn*
           Product: gdb
           Version: 7.3
            Status: NEW
          Severity: critical
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: speedaemon1@gmail.com
    Classification: Unclassified


Created attachment 6997
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6997
GDB Trace of execution using posix_spawn()

When attempting to debug a application in C++ that implements fork() to execute
another process through either exec* or posix_spawn* GDB fails.

132,000 ~"/home/dkg/src/gdb/gdb-7.3/gdb/thread.c:620: internal-error:
is_thread_state: Assertion `tp\' failed.\nA problem internal to GDB has been
detected,\nfurther debugging may prove unreliable.\nQu\ it this debugging
session? "

Using fork() alone executes correctly.  Only when using exec* or posix_spawn*
generates the issue.

Attempting this on the following platform

OS: Debian Squeeze (Linux 2.6.32-5-amd64)
GDB version 7.3 (Debian Backport)

I am using Eclipse CDT IDE to interact with GDB and attached is the GDB Trace.

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[Bug c++/15397] GDB fails on fork with exec* or posix-spawn*

[speedaemon1 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15397

--- Comment #1 from speedaemon1 at gmail dot com 2013-04-25 14:13:17 UTC ---
Created attachment 6998
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6998
C++ code for test

The attached file contains the code used to test the issue.

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[Bug gdb/15397] GDB fails on fork with exec* or posix-spawn*

[speedaemon1 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15397

speedaemon1 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |gdb

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[Bug gdb/15397] GDB fails on fork with exec* or posix-spawn*

[speedaemon1 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15397

speedaemon1 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |speedaemon1 at gmail dot
                   |                            |com

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[Bug gdb/15397] GDB fails on fork with exec* or posix-spawn*

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15397

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |palves at redhat dot com
         Resolution|                            |WORKSFORME

--- Comment #2 from Pedro Alves <palves at redhat dot com> 2013-04-30 15:19:51 UTC ---
Please try a more recent GDB; we've just released 7.6.

That said, I've tried it myself, on the command line, with:

$ gdb -i=mi pr6998 -ex "set target-async on" -ex "set non-stop on" -ex "set
detach-on-fork off"

both mainline and 7.6, and I saw no crash.

Please reopen if you can reproduce this with 7.6 or mainline.

Thanks.

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