[Twisted-Python] catching twisted pyqt segmentation fault

[Glyph Lefkowitz]

In general, detecting segfaults in arbitrary processes on the system probably isn't possible.

Specifically, I looked up the docs for you ;).

Attach a handler to the QWebEngineView::renderProcessTerminated signal :).

https://doc.qt.io/qt-5/qwebengineview.html#renderProcessTerminated <https://doc.qt.io/qt-5/qwebengineview.html#renderProcessTerminated>

Hope this helps,

-glyph

> On Feb 26, 2017, at 11:16 AM, Kevin Mcintyre <kebin70 at gmail.com> wrote:
> 
> Thanks glyph - really appreciate all the times you've answered my questions!
> 
> QtWebEngineView is running a subprocess.
> 
> /home/ubuntu/Qt5.8.0/5.8/gcc_64/libexec/QtWebEngineProcess --type=renderer --disable-accelerated-video-decode --disable-gpu-memory-buffer-video-frames --enable-threaded-compositing --use-gl=desktop --disable-webrtc-hw-encoding --primordial-pipe-token=032B94B57A61DAE34BD0F90551F9ABB6 --lang=en-US --enable-pinch --num-raster-threads=2 --content-image-texture-target=3553
> 
> QT can sometimes be helpful, but bug resolution can take a while.
> 
> Any suggestions outside of twisted for detecting segfaults?  I'm thinking just to monitor /var/log/syslog 
> 
> 
> 
> 
> 
> On Sat, Feb 25, 2017 at 11:59 PM, Glyph Lefkowitz <glyph at twistedmatrix.com <mailto:glyph at twistedmatrix.com>> wrote:
> 
> > On Feb 25, 2017, at 4:41 PM, Kevin Mcintyre <kebin70 at gmail.com <mailto:kebin70 at gmail.com>> wrote:
> >
> > I have a long running twisted pyqt process which occasionally throws a Received signal 11.
> >
> > I believe it's in the underlying QtWebEngineView since the twisted process continues to run.  Whatever the reason I would like to figure out a way to catch this and stop the reactor either in process, or by another process monitor.  Any suggestions either twisted or otherwise would be greatly appreciated.
> 
> Presumably the QtWebEngineView is running a subprocess, then?  This is really a Qt question rather than a Twisted question, because the QtWebEngineView should be emitting some kind of signal when its rendering process crashes.  (If it doesn't I imagine you're just out of luck here and you should report a bug to the Qt developers...)
> 
> -glyph
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