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From:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Subject:	Re: X crashes with SIGPIPE
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
References:	<faff3a3252644ab0f41d02854413932c9932e7af DOT camel AT gmail DOT com>
Message-ID:	<a4840a16-3739-a340-8c1f-23ad10b0d48c@dronecode.org.uk>
Date:	Mon, 20 Apr 2020 18:03:36 +0100
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Cc:	Henry Gebhardt <hsggebhardt AT gmail DOT com>
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On 18/04/2020 04:38, Henry Gebhardt via Cygwin wrote:
> Hi,
> 
> Cygwin/X crashes every few days for me. I managed to obtain a backtrace
> from the last crash (attached). Server log is also included.
> 
> I have not, yet, managed to pin down the exact trigger for the crash. I
> am running two graphical programs under Windows 10 WSL2 Debian: tilix
> and evince.
> 
> Thank you for any help.

Thanks for reporting this issue.

I am assuming, although it's not totally clear from your report, that 
you are starting the X server with '-listen tcp', and are setting 
DISPLAY to localhost:0.0 or similar in your WSL environment.

> Thread 1 received signal SIGPIPE, Broken pipe.
> [Switching to Thread 2952.0x1144]
> 0x000000010053f250 in _XSERVTransSocketWritev (ciptr=0xffffbb18,
>     buf=0xffffbc10, size=-17396) at /usr/include/X11/Xtrans/Xtranssock.c:2382
> 2382    /usr/include/X11/Xtrans/Xtranssock.c: No such file or directory.

I'm not sure this is the actual point of failure (since the X server 
should be setting SIGPIPE to be ignored), so you probably need to tell 
gdb not to stop on it e.g. 'handle sigpipe ignore'.

In any case, a sigpipe here indicates that the X client has already 
closed when the X server tries to write to it's socket.

Assuming gdb is giving accurate information here, this is also looks 
very odd, as a negative value of size (which is used as iovcnt passed to 
write) doesn't make a lot of sense.
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