emacs-nox hogs CPU if backgrounded during compile

Ryan Johnson ryan.johnson@cs.utoronto.ca
Tue Aug 27 08:29:00 GMT 2013


Ping... is anyone else at least able to reproduce this?

On 17/08/2013 2:41 PM, Ryan Johnson wrote:
> Hi all,
>
> The following STC causes emacs-nox to peg a CPU indefinitely. Emacs 
> remains responsive, but C-c C-k doesn't kill the compile; you have to 
> exit emacs to remove the "Compiling" status. Killing the buffer or 
> starting a new compile offers to kill the offending process, but doesn't.
>
> Attaching gdb shows an endless loop inside 
> kernelbase.dll!RaiseException, but provides no other clues that I 
> could see.
>
> 1. emacs-nox -Q
> 2. M-x compile
> 3. C-a C-k sleep 1; echo hi
> 4. ^Z (before the sleep finishes)
> 5. fg (after the sleep finishes)
>
> I don't know if this is related to limited pipe buffering, but I don't 
> think so: it has always worked in the past, and the the 3-4 bytes 
> required to buffer up "hi\n" is hardly onerous.
>
> $ uname -a
> CYGWIN_NT-6.1 ryan-laptop-v02 1.7.24(0.269/5/3) 2013-08-15 11:59 
> x86_64 Cygwin
>
> $ cygcheck -cd
> bash                      4.1.11-1
> cygwin                    1.7.24-1
> emacs                     24.3-5
> mintty                    1.2-beta1-1
>
> Ryan
>
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