Hi, yesterday I was digging into the bug #76510: https://bugs.php.net/bug.php?id=76510 A strange PHAR- and streams-related issue that only happens for some users/binaries.
I was able to trace it down to a GCC optimization "optimize-strlen". Here's when the bug does and does not reproduce: gcc-8 with -O0 works gcc-8 with -O1 works gcc-8 with -O2 does not work gcc-8 with -O3 does not work gcc-8 with -Og works gcc-8 with -Os works With some further testing, I was able to find a workaround: -O2 -fno-optimize-strlen I bisected this issue to the commit 513b0093c2b480bb752fb354012f42c446769486: Refactor php_url struct to save memory dup in common cases https://github.com/php/php-src/commit/513b0093c2b480bb752fb354012f42c446769486 (bisect log is in the bug report) To confirm: git checkout 513b0093c2b480bb752fb354012f42c446769486 + gcc-8 + -O2: Fatal error git checkout 513b0093c2b480bb752fb354012f42c446769486^ + gcc-8 + -O2: works Unfortunately this is where my journey ends - my C/GCC knowledge is not sufficient enough to analyse this further. I'd like to ask someone to take over from here so we can see this issue fixed in the next 7.3 pre-release. Thank you, M.
