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bug#18361: New 'sort' implementation can crash Emacs

From: Paul Eggert
Subject: bug#18361: New 'sort' implementation can crash Emacs
Date: Fri, 29 Aug 2014 22:22:48 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0

Dmitry Antipov wrote:

If an undefined behavior doesn't cause crash,

Unfortunately undefined behavior in qsort can cause a crash (or an infinite loop, etc., etc.). It's platform-dependent, and on many platforms the problem happens only in unusual cases, so I'm not surprised your tests didn't find it. But it definitely can happen. See, for example,



These crash reports are for Solaris qsort, but today I found similar issues in the latest glibc qsort by code inspection (e.g., the path qsort takes when memory is low). These issues are not qsort bugs, since the qsort spec requires a total-order comparison function. It's a bug in the Emacs trunk.

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