#15983 [Fbk]: session variables lost between pages

ID: 15983 Updated by: kalowsky@php.net Reported By: sl@scrooge.dk Status: Feedback Bug Type: Session related Operating System: Debian/Linux mips platform PHP Version: 4.1.2 and 4.2.0 New Comment: There is now a patch submitted to CVS, test the latest out and see if it works better for you. Previous Comments: ------------------------------------------------------------------------ [2002-09-03 13:39:32] pratesi@telug.it I have found some messages that could reply to our issue; the second is a reply written by Linus Torvalds: http://www.cs.helsinki.fi/linux/linux-kernel/2002-30/0486.html http://www.cs.helsinki.fi/linux/linux-kernel/2002-30/0493.html In practice, for what I'm able to understand of these messages, it seems that, on non-i386 platforms, glibc and the linux kernel could "disagree" about the implementation of pread() and then that the use of pread() on linux + glibc can fail on non-i386 platforms. Some other messages about this topic: http://www.cs.helsinki.fi/linux/linux-kernel/2002-30/0411.html http://www.cs.helsinki.fi/linux/linux-kernel/2002-30/0439.html http://www.cs.helsinki.fi/linux/linux-kernel/2002-30/0469.html And finally: http://www.cs.helsinki.fi/linux/linux-kernel/2002-30/0559.html where it is written that it is a glibc bug, fixed in the CVS. I suppose that future Linux distributions will not be affected by this problem, but, IMVVVHO, for safety reasons, currently the use of pread() should be avoided on non-i386 Linux platforms, and this should solve this issue. ------------------------------------------------------------------------ [2002-08-30 14:45:07] pratesi@telug.it Debian Woody 3.0r0 PPC, PHP 4.2.2 --------------------------------- bash$ find . -name php_config.h ./debian/php4-dev/usr/include/php4/main/php_config.h ./apache-build/main/php_config.h ./cgi-build/main/php_config.h In all these 3 files, HAVE_PREAD is defined and set to 1: /* Define if you have the pread function. */ #define HAVE_PREAD 1 BTW, I could try to compile PHP 4.1 or 4.2 on a Linux PPC box based on glibc 2.1 and check if the same problem occurs also with glibc 2.1. Could this check be useful? ------------------------------------------------------------------------ [2002-08-30 12:14:18] kalowsky@php.net Can any of you check your php_config.h file and see if the HAVE_PREAD variable is defined? ------------------------------------------------------------------------ [2002-08-30 10:06:12] sl@scrooge.dk I will try to make some test this weekend om the MIPS platform. ------------------------------------------------------------------------ [2002-08-30 06:54:12] pratesi@telug.it I can make all tests that you want as I'm the sys admin of the computers at hand. But if tests affect the use of apache and php, a bit of patience is needed, as the computer currently using that workaround is a production server, hence I need to install and set up an unsed computer of the rack. An analogous consideration holds true for the Sparc I'm using :-) If you prefer, we can continue with private mailing. Which tests should I perform on the pread() ? Should I open a bug report for glibc 2.2 ? Thank you for your time. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/15983 -- Edit this bug report at http://bugs.php.net/?id=15983&edit=1