Help to understand/fix Kdevelop Crash

[Milian Wolff]

On Saturday 18 April 2015 12:59:49 Lucas Tanure wrote:
> On Apr 18, 2015 12:52 PM, "Milian Wolff" <mail at milianw.de> wrote:
> > Hey All!
> > 
> > On Tuesday 17 March 2015 13:22:05 David Nolden wrote:
> > > Actually, the absolute limit on the size of the item repository is 4GB,
> > > because the index is a 32 bit number, and there can be 1<<16 buckets,
> 
> each
> 
> > > of size 1<<16, i.e. 1<<32=4.3GB. Maybe this limit is hit in your case.
> 
> Can
> 
> > > you add some assertion which avoids "wrapping" of the bucket number
> > > (especially of the buckets spanned by the "monster bucket extent")?
> > > 
> > > However, that limit applies to each item repository separately. In your
> > > case it seems to be the persistent symbol table. IMO it should never
> 
> become
> 
> > > that huge, not even for the linux kernel. So I guess this is a problem
> 
> in
> 
> > > kdevelop-clang, which puts too much stuff in the symbol table (just a
> > > guess).
> > 
> > I think this is a very good guess. I've seen similar problems before in
> 
> kdev-
> 
> > clang and that should certainly be investigated. Kevin, you added some
> 
> tooling
> 
> > around the item repositories recently, no? Can we see what gets added to
> 
> the
> 
> > symbol table and what not?
> > 
> > Also, Lucas - you marked https://bugs.kde.org/show_bug.cgi?id=343950 as a
> > duplicate but say here it's actually not. So should I un-mark it and keep
> 
> it
> 
> > open?
> 
> Yes keep open. I really think that is the same bug, because the stack trace
> is the same.
> 
> I bought more ram for me, but the issue is still happening.
> I would like that kdev-clang save on the hard drive the parsing output,
> because it's not good to reparse the files every time.

It is saving stuff, but when the cache gets (potentially) corrupted during a 
crash it cannot assume the saved stuff is usable. Thus it kills the cache and 
starts again and crashes again (in your case). This is unfortunate but sadly 
what we have so far :(

I'll try to look into this issue over the coming days. Can you give me some 
steps on what you do with the linux kernel? That way I could try to reproduce 
it.

- which version of the kernel sources do you have?
- how do you import it into kdevelop?
- anything else I should be aware of?

Thanks
-- 
Milian Wolff
mail at milianw.de
http://milianw.de