Re: Segmentation fault in PHP 7.0.3 (and earlier versions)

On Fri, Feb 5, 2016 at 7:37 PM, Simon Svensson <sisve@devhost.se> wrote: > Hi, > > I'm using Ondřej Surý's ppa which was recently upgraded to PHP 7.0.3. My > test-suite is causing segmentation faults since 7.0.0 RC5, including the > 7.0.3 release. > > I can reproduce this consistently by running my test-suite in PHPUnit. > Identifying the tests executing when the fault occurs (using --debug) > and rerunning them one-by-one does not reproduce the segmentation faults. > > I'm running this on Ubuntu 14.04.3 LTS. My application is built on with > Laravel 5.1 and Doctrine 2.5. I'm using PHPUnit 4.8 and an in-memory > sqlite database for the tests. (I'm mentioning this to convey what type > of code is running.) > > My test-suite works on PHP 5.6 and HHVM. > > I've got a gist with a gdb backtrace, with and without opcache. (There's > no difference.) > With: https://gist.github.com/sisve/0f75be357e557d439c19 > Without: https://gist.github.com/sisve/01542193a27fd9da2b7b > > I've verified that the opcache is disabled by '/usr/bin/php7.0 -i | grep > "opcache.enable"' not returning anything, and '/usr/bin/php7.0 -m' > does > not contain any entry for opcache. (I'm unsure if this is enough.) > > I've got some older backtraces from my previous failures. These may be > related, or related to something totally different. These have unknown > opcache-status (probably enabled). > PHP 7.0.2: https://gist.github.com/sisve/05b4c4075ef223c4ab52 > PHP 7.0.0-RC?: > https://gist.github.com/sisve/fe8e1b85b4cc488ff457 > PHP 7.0.0-RC5: > https://gist.github.com/sisve/7ce5980e05068972b8e6 > PHP 7.0.0-RC5: > https://gist.github.com/sisve/ad318ca820a38bdb8133 > > I've been whining some time on irc about this, and finally got my thumb > out of my behind to write this email. > > I doubt that these traces are enough to identify and solve the problem. > What can I do to gather more information and debug this further? > Interesting. The traces tell us some really vague clue, we'd really need a reproducer. It seems to be involving generators triggered through reflection, faulting on a foreach() by value. However, can you confirm that you *don't* reproduce with a debug build of PHP ? (exact same reproducer) This is really weird. You may try -O0 -g only. Julien.Pauli