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Re: Intermittent failures with ctrl-c (was: retrieving process exit codes)


On 01/02/2013 04:24 PM, Tom Honermann wrote:
On 01/02/2013 03:48 PM, Christopher Faylor wrote:
I managed to duplicate a hang by really stressing ctrl-c a loop.  It
uncovers some rather amazing Windows behavior which I have to think
about.  Apparently ExitThread can be called recursively within the
thread that Windows creates to handle CTRL-C.

I'm glad you could reproduce. Based on your description, this sounds like a separate issue and not a regression introduced by the workarounds you put in place for the ExitProcess / ExitThread race. Correct?

I wonder if this is the same issue I'm experiencing though.  I'm only
pressing ctrl-c once and it sounds like you might be deliving a ctrl-c
to the same process multiple times.  That may not be relevant to the
root cause however.

I noticed that some changes were checked in related to signal handling and process termination recently, so I downloaded the most recent snapshot (20130114) and tested again. I was still able to produce hanging processes (including hangs of strace.exe) by hitting ctrl-c in a mintty window while Cygwin processes ran in an infinite loop inside of a .bat file. I was able to produce a hang ~1 out of 20 times.


If you are still working on this, then I apologize for the noise. Otherwise, assuming you are still looking at this, if I can provide something further that would be helpful, please let me know.

Tom.


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