Re: still seeing semi-regular lockups

[Eric Abrahamsen <eric@ericabrahamsen.net>]

On 05/19/14 23:21 PM, Daimrod wrote:
> Daimrod <daimrod@gmail.com> writes:
>
>> I have also semi-regular lockup with org-mode. I have opened a bug on
>> debbugs and here is what Stefan told me to try to debug this:
>>
>>> You can try `debug-on-event'.
>>> 
>>> There's jit-lock-debug-mode but it doesn't disable inhibit-quit.
>>> So you'll need to additionally use
>>> 
>>>    (advice-add 'jit-lock--debug-fontify :around
>>>      (lambda (fun &rest args)
>>>        (with-local-quit (apply fun args))))
>>> 
>>> Of course sometimes this doesn't work because jit-lock-debug-mode
>>> changes the way things are executed and the bug may not manifest itself
>>> any more, but it's worth a try.
>>> 
>>> Another source of info is to
>>> 
>>>   M-x trace-function RET org-adaptive-fill-function RET
>>>   M-x trace-function RET org-element-at-point RET
>>>   M-x trace-function RET org-element--cache-sync RET
>>>   M-x trace-function RET org-element--cache-process-request RET
>>> 
>>> Then reproduce the hang, then break the hang somehow (maybe with the
>>> jit-lock-debug hack above, or maybe with debug-on-event, or with C-g C-g
>>> C-g, ...), then look at the *trace..* buffer.
>>
>> I'll try to see what I can find this week end and report back.
>
> Ok, so the good news is the `debug-on-event' trick works. If you got a
> lockup, you can get a classic elisp backtrace by sending the SIGUSR2 to
> the Emacs process.
>
> The bad news is that I don't know yet how to reproduce the lockup. It
> seems to happen mostly (if not only) when I use org-mode +
> visual-line-mode + adaptive-wrap-prefix-mode + an input-method like
> latin-postfix.
>
> And it probably has to do with the cache mechanism. I'll try to
> reproduce it with the cache disabled but it hard to test because, as I
> said, I don't know how to reproduce it yet.
>
> I'll keep testing and see if I can reproduce it reliably.
>
> Stay tuned!

Of course I haven't gotten a single lock-up since reporting in last time...