#19022 [Fbk]: PHP Warning: Failed to write session data (files)

From:	wez@php.net	Date:	Thu, 05 Sep 2002 00:11:40 +0000
Subject:	#19022 [Fbk]: PHP Warning: Failed to write session data (files)
References:	1	Groups:	php.bugs
Request:	Send a blank email to php-bugs+get-18458@lists.php.net to get a copy of this message

 ID:               19022
 Updated by:       wez@php.net
 Reported By:      phpbugs@mx4k.com
 Status:           Feedback
 Bug Type:         Session related
 Operating System: linux (rh7.3), apache 1.3.26
 PHP Version:      4.2.2
 New Comment:

Shane: please read the following:
http://www.php.net/license/3_0.txt (particularly
the part
in uppercase).

Then read this:
http://www.derickrethans.nl/20020502.php.



Previous Comments:
------------------------------------------------------------------------

[2002-09-04 18:47:38] ShaneO@alldigitalservices.com.au

Our client just pulled out and i lost my job due to this bug. Thanks
guys

------------------------------------------------------------------------

[2002-09-04 08:41:38] kalowsky@php.net

Yes actually the PREAD functionality in the glibc has been found to be
buggy (this is actually in another bug report as well, I just forget
the number off hand).  It was fixed in the CVS for glibc, but that was
only as of July 2002.  

Regardless, try a snapshot for HEAD dated sometime after this point,
I've taken the PREAD out again.  Post back results.  

------------------------------------------------------------------------

[2002-09-04 06:35:48] phpbugs@mx4k.com

hi there,

as far as i can tell the problem only appears if the server runs on
middle to high load. (eg. >100httpd)

the problem machine is a p4-1,8ghz with 1gig ram (no smp) and we
couldnt yet reproduce the problem on any other server. the machine only
runs the httpd, postgres is running on a different machine. its using a
IDE hd (some special scsi or something)

i'm willing to apply some patches to get rid of the problem. i looked
into the problem myself but couldn't find any problem in PS(mod)->write
or the resulting write to the hd (which i guess is
PS_WRITE_FUNC(files)). I never coded on linux neither much of c (only
c++, c#, java) but maybe p/write does have a problem.

#ifdef HAVE_PWRITE  
        n = pwrite(data->fd, val, vallen, 0);
#else                   
        lseek(data->fd, 0, SEEK_SET);
        n = write(data->fd, val, vallen);
#endif

anyways, send me some patches via email and i'll try my best to find a
workarround.

greets,
thomas

------------------------------------------------------------------------

[2002-09-04 00:47:38] rasmus@php.net

Yup, the SMP means it likely has multiple processors.  "cat
/proc/cpuinfo" would tell you for sure.  A nasty bug was fixed recently
which only affected SMP machines and would cause exactly these
symptoms.  4.2.3 will have the fix.

------------------------------------------------------------------------

[2002-09-04 00:43:56] rossr@reactive.com

I'm not sure since we don't host the production site we are just the
developers. When I do a uname I get this:

Linux lsh129.siteprotect.com 2.4.18-pre7 #5 SMP Mon Feb 4 17:42:59 CST
2002 i686 unknown

I'm guessing that the SMP bit means that the server is using multiple
processors, but I'm not sure.

------------------------------------------------------------------------

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/19022

-- 
Edit this bug report at http://bugs.php.net/?id=19022&edit=1



   

Thread (75 messages)

• phpbugs at mx4k dot comWed, 21 Aug 2002 15:09:17 +0000
  • phpbugs at mx4k dot comWed, 21 Aug 2002 15:14:19 +0000#19022 [Opn]: PHP Warning: Failed to write session data (files)
  • sander@php.netWed, 21 Aug 2002 17:33:19 +0000#19022 [Opn->Bgs]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comWed, 21 Aug 2002 22:51:11 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comThu, 22 Aug 2002 11:10:48 +0000#19022 [Bgs]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comThu, 22 Aug 2002 11:16:31 +0000#19022 [Bgs->Opn]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comFri, 23 Aug 2002 10:15:31 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • rossr at reactive dot comMon, 26 Aug 2002 00:21:18 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • m dot heidenwolf at ehotel dot agTue, 27 Aug 2002 07:22:13 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comTue, 27 Aug 2002 10:08:14 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • ShaneO at alldigitalservices dot com dot auWed, 04 Sep 2002 04:08:25 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • ShaneO at alldigitalservices dot com dot auWed, 04 Sep 2002 04:35:56 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • kalowsky@php.netWed, 04 Sep 2002 04:46:18 +0000#19022 [Opn->Fbk]: PHP Warning: Failed to write session data (files)
  • rossr at reactive dot comWed, 04 Sep 2002 05:06:05 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • rasmus@php.netWed, 04 Sep 2002 05:29:59 +0000#19022 [Fbk]: PHP Warning: Failed to write session data (files)
  • rossr at reactive dot comWed, 04 Sep 2002 05:43:56 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • rasmus@php.netWed, 04 Sep 2002 05:47:39 +0000#19022 [Fbk]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comWed, 04 Sep 2002 11:35:49 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • kalowsky@php.netWed, 04 Sep 2002 13:41:38 +0000#19022 [Fbk]: PHP Warning: Failed to write session data (files)
  • ShaneO at alldigitalservices dot com dot auWed, 04 Sep 2002 23:47:38 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • wez@php.netThu, 05 Sep 2002 00:11:40 +0000#19022 [Fbk]: PHP Warning: Failed to write session data (files)
  • ShaneO at alldigitalservices dot com dot auThu, 05 Sep 2002 03:57:37 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • kalowsky@php.netThu, 05 Sep 2002 04:22:10 +0000#19022 [Fbk]: PHP Warning: Failed to write session data (files)
  • kivi at picox dot seFri, 06 Sep 2002 09:39:27 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comWed, 18 Sep 2002 11:52:29 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • sniper@php.netThu, 26 Sep 2002 17:08:25 +0000#19022 [Fbk]: PHP Warning: Failed to write session data (files)
  • php-bugs at lists dot php dot netTue, 15 Oct 2002 00:26:53 +0000#19022 [Fbk->NoF]: PHP Warning: Failed to write session data (files)
  • taylorfdavis at netscape dot netTue, 15 Oct 2002 14:40:22 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • ivo at ibuildings dot nlFri, 18 Oct 2002 08:29:47 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • ronnie at rustybrick dot comTue, 22 Oct 2002 13:45:43 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • mderk at yandex dot ruMon, 11 Nov 2002 09:12:24 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • Julian dot Bond at ecademy dot comTue, 12 Nov 2002 20:33:58 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • webmaster at jumpthru dot comSun, 08 Dec 2002 02:05:38 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • webmaster at jumpthru dot comSun, 08 Dec 2002 02:32:26 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • brad at kieser dot netFri, 13 Dec 2002 00:25:46 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • mgruenb at gmx dot netThu, 23 Jan 2003 20:28:51 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • oscar at cerecita dot comSat, 25 Jan 2003 05:12:18 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • phpbugs at mx4k dot comMon, 27 Jan 2003 14:15:51 +0000#19022 [NoF->Opn]: PHP Warning: Failed to write session data (files)
  • cold80 at libero dot itWed, 29 Jan 2003 11:25:33 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • sniper@php.netWed, 29 Jan 2003 12:02:15 +0000#19022 [Opn->Fbk]: PHP Warning: Failed to write session data (files)
  • cold80 at libero dot itThu, 30 Jan 2003 09:52:33 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • sniper@php.netSat, 08 Feb 2003 07:01:21 +0000#19022 [Fbk->NoF]: PHP Warning: Failed to write session data (files)
  • jsarac at fi dot uba dot arFri, 21 Mar 2003 12:35:26 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • php at rjs3 dot comFri, 18 Apr 2003 14:01:35 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • skye at f4 dot caTue, 22 Apr 2003 00:25:05 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • php at rjs3 dot comTue, 22 Apr 2003 14:02:12 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • e dot aderhold at pro-seco dot deMon, 05 May 2003 08:09:16 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • wieri420 at planet dot nlTue, 08 Jul 2003 07:31:23 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • alexbodn at 012 dot net dot ilMon, 28 Jul 2003 01:40:42 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • alexbodn at 012 dot net dot ilMon, 28 Jul 2003 02:01:38 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • leiflists at tanukisoftware dot comMon, 28 Jul 2003 05:01:22 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • rajiv at rajivlodha dot cjb dot netSun, 04 Jan 2004 17:58:29 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • rajiv at rajivlodha dot cjb dot netSun, 04 Jan 2004 18:01:05 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • lennaert dot goris at ellips dot wsMon, 12 Jan 2004 01:19:52 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • oliver at realnet dot orgMon, 19 Jan 2004 22:01:48 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • haccel at email dot comTue, 20 Jan 2004 02:02:22 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • august24_70 at yahoo dot comWed, 21 Jan 2004 13:45:26 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • stewart dot james at vu dot edu dot auTue, 02 Mar 2004 01:15:10 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • haccel at email dot comThu, 11 Mar 2004 06:05:02 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • guertin at brucemaudesign dot comFri, 26 Mar 2004 21:15:53 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • guertin at brucemaudesign dot comFri, 26 Mar 2004 21:40:43 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • phpbugs at chime dot tv dot cutthisFri, 02 Apr 2004 17:02:00 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • nicolas at swarm dot ccSat, 03 Apr 2004 12:10:24 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • oliver at veryhip dot comTue, 18 May 2004 05:01:48 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • oliver at veryhip dot comMon, 12 Jul 2004 01:02:28 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • stranger at teuton dot orgWed, 03 Jan 2007 21:49:23 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • allan at emeraldforest dot comFri, 28 Dec 2007 23:45:51 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • ozdemir_e at yahoo dot comSat, 19 Jan 2008 22:07:25 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • m1ckx at hotmail dot comThu, 28 Feb 2008 12:04:48 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • rasmus@php.netThu, 28 Feb 2008 17:50:50 +0000#19022 [NoF]: PHP Warning: Failed to write session data (files)
  • prikid at gmail dot comTue, 31 Mar 2009 20:15:46 +0000#19022 [Com]: PHP Warning: Failed to write session data (files)
  • glspeed at juno dot comSun, 04 Jul 2010 03:14:41 +0000Bug #19022 [Com]: PHP Warning: Failed to write session data (files)
  • jamontoya at unitec dot eduTue, 04 Jan 2011 21:33:39 +0000Bug #19022 [Com]: PHP Warning: Failed to write session data (files)
  • dutchprogrammer at gmail dot comWed, 10 Jun 2015 08:43:57 +0000Bug #19022 [Com]: PHP Warning: Failed to write session data (files)
  • roel dot duijnhoven at gmail dot comWed, 17 Jun 2015 07:10:40 +0000Bug #19022 [Com]: PHP Warning: Failed to write session data (files)