clang (both 3.3 and 3.4) OOM crashes on HEAD

[Dmitry Marakasov]

* Dimitry Andric (dim at FreeBSD.org) wrote:

> > I've been getting some failure mails from pkg building cluster related
> > to clang crashes:
> > 
> > http://beefy2.isc.freebsd.org/bulk/head-amd64-default/2014-02-28_01h43m56s/logs/arx-libertatis-1.0.3_2.log
> > http://beefy1.isc.freebsd.org/bulk/head-i386-default/2014-02-21_03h01m36s/logs/supertuxkart-0.8.1.log
> > 
> > At first I thought they'll go away with clang 3.4, but recently I've
> > added HEAD jail to my tinderbox and reproduced these. Also a reason
> > of crashes become apparent: c++ eats all available memoty (15G RSS
> > in my case).
> > 
> > I though of investigating these further, but wanted to check if it's
> > already known first.
> 
> There are a few known OOM bugs in 3.4, but from the logs it is not
> immediately apparent if you are hitting those, or if they are new bugs.

Note that it affects both 3.3 and 3.4. I think it was triggered by
something unrelated to clang update, maybe libc++ update.

> To be able to figure that out, we need the files mentioned in clang's
> diagnostic messages, e.g. for arx-libertatis:
> 
> /tmp/Input-XkKTNq.cpp
> /tmp/Input-XkKTNq.sh

Here's one from arx-libertatis:

http://people.freebsd.org/~amdmi3/clang-eats-mem-bug.tar.bz2

The bug is reproducible on my 10.x with both system clang 3.3 (after
removing -vectorize-loops -vectorize-slp options) and with clang 3.4
from ports.

-- 
Dmitry Marakasov   .   55B5 0596 FF1E 8D84 5F56  9510 D35A 80DD F9D2 F77D
amdmi3 at amdmi3.ru  ..:  jabber: amdmi3 at jabber.ru    http://www.amdmi3.ru