Crash in Brackets Sprint 30

[dangoor]

We've had two crash reports for Sprint 30. @cfjedimaster reported a crash (with no associated slowdown) while working on a file with unsaved data.

The crash log turned up a problem that arose in v8's parser.

[dangoor]

Adding the "Mac only" label, because the two reports we had were both from Mac users.

[njx]

Unfortunately I completely failed to write down the procedure I figured out for symbolizing a crash log like this, but it basically involved downloading the symbol file for the appropriate version of CEF, cutting the column of stack addresses out of the stack trace, and using atos to do the lookup. I can look at this later in the afternoon, but am blocked by meetings for most of the day.

[njx]

Assigning to me for now.

[dangoor]

I did write down the procedure for symbolizing a crash log. I'm in meetings until noon pacific, but I could steal this from you and symbolize the stack trace after that.

[njx]

Looks like I'm free at 1 PT, so if you're free before that feel free to grab it, otherwise I can look at it then.

[dangoor]

This appears to be a v8 bug. I'm hoping that we can find out if it's been fixed already. I'm going to mark this tracking for now, because I don't think there's anything we can do on our end just yet.

[Janpot]

@dangoor Like you asked on thread https://groups.google.com/forum/?fromgroups#!topic/brackets-dev/PHvGHgmKEvc here's my crash log, I also want to add that I've seen the same slowdown before with Ctrl-X on windows as well

(edited by @dangoor to move the crashlog elsewhere.)

This crash log shows an error in v8's incremental GC.

[dangoor]

Thanks for the info @Janpot. Your crash appears to be in v8 also, but in a different place.

[pthiess]

Adding recommendations from Niklas to get additional information. At this point I lower the priority as we don't see a high volume and we don't have repro steps.

1. It would be useful if we can get a core dump for the crashing process.

On Mac OS X, add "limit core unlimited" to /etc/launchd.conf and reboot the machine.
Future crashes will produce core dumps in /cores/core.

2. Additional useful information could come from V8 tracing. If it indeed is a bug in the V8 parser, it would be useful to know which piece of JS that triggered it.
   I am not familiar with how command line flags can be provided in CEF, but in Chromium --js-flags="--prof --log-timer-events" will enable fine-grained logging in v8 (ends up in v8.log).

[cfjedimaster]

As just an FYI, I just had this happen again. This time while running Brackets from source, not a release build. I had literally just sat down to do some work, changed my project, turned on Live Connect, and typed some HTML when it went white. I'm going to do the limit action now and reboot.

Just noticed - I don't have /etc/launchd.conf.

[njx]

@cfjedimaster - can you post your new crash log so we can verify it's the same crash? Thanks.

[nqn]

@cfjedimaster sorry to hear you experienced the crash once more.

From the stack traces, it appears to be memory/GC issues. It would be extremely useful to get a core file for the crash.
If /etc/launchd.conf doesn't exist already, just go ahead and create it. It will work after a reboot.
Core files will be placed in /cores/< pid >.core
Note that core files can be fairly large (GB+), so you might want to disable it in the future.

We have reported the two incidents to the V8 developers and will follow up with any update on the issue.

[cfjedimaster]

I've added it and will reboot soon.

On Mon, Sep 16, 2013 at 10:36 AM, Niklas Quarfot Nielsen <
notifications@github.com> wrote:

@cfjedimaster https://github.com/cfjedimaster sorry to hear you
experienced the crash once more.

From the stack traces, it appears to be memory/GC issues. It would be
extremely useful to get a core file for the crash.
If /etc/launchd.conf doesn't exist already, just go ahead and create it.
It will work after a reboot.
Core files will be placed in /cores/.core
Note that core files can be fairly large (GB+), so you might want to
disable it in the future.

We have reported the two incidents to the V8 developers and will follow up
with any update on the issue.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/5132#issuecomment-24519293
.

Raymond Camden, Adobe Developer Evangelist

Email : raymondcamden@gmail.com
Blog : www.raymondcamden.com
Twitter: cfjedimaster

[njx]

Hey--would still like to get your latest crash log (even if you don't have a core dump for it) so we can make sure it's the same crash. Thanks.