[Bug python/14382] New: gdb hangs after plotting with matplotlib

["joeneeman at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14382

             Bug #: 14382
           Summary: gdb hangs after plotting with matplotlib
           Product: gdb
           Version: 7.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
        AssignedTo: unassigned@sourceware.org
        ReportedBy: joeneeman@gmail.com
    Classification: Unclassified


Created attachment 6542
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6542
Python command that hangs gdb.

I'm attempting to write a gdb command in python that will display some data in
a matplotlib plot. The plotting itself works fine: the plot is shown and I can
interact with it. While the plot is open, the (gdb) prompt is not shown, as
mp.show() is blocking.

After I close the plot, the problems begin. I am returned to the (gdb) prompt
and I can issue certain commands (for example, "list" works as expected).
However, if I attempt to continue running the program being debugged (eg. with
"next" or "continue"), then gdb becomes unresponsive (including to ^C).

You can reproduce the problem with the file I have attached (requires
matplotlib to be installed):

echo "int main() { return 0; }" > gdbtest.c
gcc -g -o gdbtest gdbtest.c
gdb gdbtest

(at the (gdb) prompt)
source gdbtest2.py
plot
(close the plot window)
run
(gdb hangs)

I am using gdb 7.4.1 on arch linux.

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