[Bug gdb/14633] New: GDB hangs when running a Qt GUI

["lacelle at roboticresearch dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14633

             Bug #: 14633
           Summary: GDB hangs when running a Qt GUI
           Product: gdb
           Version: 7.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: lacelle@roboticresearch.com
    Classification: Unclassified


When I'm running some Qt code I wrote, which has previously been debug-able
quite easily, all of a sudden it hangs every time my program launches.

If I send it SIGCONT, it continues.  I often have to send multiple SIGCONT
signals.

This problem goes away if I run strace on the GDB process with "-f -e
trace=signal -p <pid>" while I'm trying to debug.

The version I'm running of GDB is 7.5, which I upgraded from the Ubuntu
repository's default 7.4.  My version of pthread is 2.0.16.  I'm running Qt
4.8.1, if that's helpful.

I'm sorry that I cannot provide a test case.  I could provide strace info if it
would be helpful.  When it's hung, I cannot break out.

The version of libthread_db I'm using is:
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1

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