[Bug gdb/17247] gdb freezes on multi threaded app (test-case attached)

["xdje42 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17247

--- Comment #31 from Doug Evans <xdje42 at gmail dot com> ---
Can I ask someone to try this patch to see if it fixes the hang?
It does for me, but I'd like to get more confirmation if I can.

If you've changed libgc from 7.4 to 7.2, you'll need to restore back to 7.4.
And if you've built gdb --without-guile, you'll need to rebuild it with guile.
[The point being we want to test with a gdb that experiences the hang.
It would be a good idea to first do a "before" test, just to verify you are
seeing the hang, apply the patch, rebuild, and see if the hang goes away.

Many thanks to any who can try this.

[I'm not sure bugzilla will let me attach the file in this post.
Look for 17247-experiment-1.patch in the Attachments list.]

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