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Re: [gnugo-devel] Error in gnugo 3.9.1

From: Gunnar Farnebäck
Subject: Re: [gnugo-devel] Error in gnugo 3.9.1
Date: Tue, 25 Jan 2011 22:00:42 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101226 Icedove/3.0.11

On 01/23/11 23:06, Gunnar Farnebäck wrote:
On 01/22/11 19:18, Kőri Gábor wrote:

I found an error in the latest official release in use gnugo. I
attached the SGF file of the game. Gnugo plays as black. When the
level of the bot set to 9, 10, 11 or 12, then gnugo crashes.

Thanks for the report.

Unfortunately I'm not able to reproduce the crash. Can you describe
your platform, build flags, runtime options, and the exact error
message in case the crash is due to an assertion failure?

Thanks to further off-list assistance from Kőri we now have a
reproducible testcase and indications from valgrind that uninitialized
memory gets into the semeai reading, leading to corrupted data
structures and eventually a segmentation fault.

See for details.


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