Re: still seeing semi-regular lockups

[Daimrod <daimrod@gmail.com>]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> Daimrod <daimrod@gmail.com> writes:
>
>> Bastien <bzg@gnu.org> writes:
>>
>>> Hi Eric,
>>>
>>> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>>>
>>>> After Nicolas made the last round of improvements to the caching
>>>> mechanism I got far fewer hangs with Org, but they are still happening.
>>>> Maybe once a day or so, on average, editing something in an Org buffer
>>>> causes emacs to hang, and my fans to spin up, and there we are until I
>>>> kill emacs.
>
> [...]
>
>> 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.
>>
>> By the way, if you want to see in which part the infloop occurs, you can
>> attach a gdb debugger to the running emacs, source the
>> <path-to-emacs-source>/src/.gdbinit file and use the `xbacktrace' command.
>>
>> $ gdb <path-to-emacs-executable> <emacs-pid>
>> gdb) source <path-to-emacs-source>/src/.gdbinit
>> ...
>> gdb) xbacktrace
>>
>> You can also use the `bt' command but it contains much more noise.
>
> Thanks! This is the sort of thing I assumed I'd have to do, and it's
> good to have an actual recipe. If you're on it, I might take the lazy
> option and spectate for now... :)

No problem, but could you attach gdb during a lockup, source .gdbitinit
and use the `xbacktrace' command to see if the lockup happens at the
same place?

-- 
Daimrod/Greg