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bug#716: 23.0.60; opening tgz file causes emacs crash

From: Jason Rumney
Subject: bug#716: 23.0.60; opening tgz file causes emacs crash
Date: Sat, 23 Aug 2008 00:12:38 +0800
User-agent: Thunderbird (Windows/20080708)

Jason Rumney wrote:
In trying to debug this, I think I have found where it is going wrong

On further investigation, I think I was seeing symptoms of the problem (smashed stack), not the cause. The NULL argument I observed was inconsistent with the next stack frame up, where the same argument was perfectly valid.

The problem starts to occur with version 1.126 of lisp/tar-mode.el. This version contained a rewrite to use separate unibyte and multibyte buffers rather than switching between them in the same buffer. I think something is going wrong here - a possible problems is that the buffer where the crash occurs has a buffer-file-coding-system of iso-latin-1-dos, but my tar program outputs unix line ends (checked by redirecting output to a file, and letting Emacs auto-detect line ends in that file).

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