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Posted to bugs@httpd.apache.org by bu...@apache.org on 2005/12/28 20:24:59 UTC

DO NOT REPLY [Bug 38065] New: - Apache2 rapidly consumes a lot of memory and crashes the server

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           Summary: Apache2 rapidly consumes a lot of memory and crashes the
                    server
           Product: Apache httpd-2
           Version: 2.0.55
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: worker
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: ruby@joker.linuxstuff.pl


We're running Apache 2.0.55 (from Debian testing package ver 2.0.55-3) on Linux 
2.6.14.3. We use worker MPM, mod_actions, mod_rewrite, mod_layout and fastcgi 
running php. Box serves about 40-50 requests per second. Once in a while one of 
apache2 processes rapidly starts to consume lot of memory, freezing the system 
and finally crashing it, without any chance to stop it or trace it. We wasn't 
able to find out what is causing this, error.log doesn't say anything useful and 
because of sudden apache2 process behaviour tracing is also very hard.

Below is attached 'top' screen right before the actual crash, as well as some 
syslog output before another server reboot.

----------

 top - 21:15:21 up  1:29,  2 users,  load average: 17.18, 9.77, 6.55
 Tasks: 116 total,2 running, 114 sleeping,0 stopped,0 zombie
 Cpu(s):  1.3% us,  5.3% sy,  0.0% ni,  0.0% id, 90.7% wa,  1.3% hi,  1.3% si
 Mem:905776k total,898128k used,7648k free,404k buffers
 Swap:0k total,0k used,0k free,18236k cached

 PID USERPR  NI  VIRT  RES  SHR S %CPU %MEMTIME+  COMMAND
 130 root150000 S  3.0  0.00:00.13 pdflush
 6485 www-data  210  881m 600m 1100 S  1.3 67.90:04.83 apache2
 9959 www-data  160  284m 8404 1124 S  1.0  0.90:00.57 apache2
 1483 root170  2620  544  412 D  0.3  0.10:01.05 syslogd
 4789 www-data  250  293m  16m 1136 S  0.3  1.90:06.94 apache2
 7270 root160  2196 1100  820 R  0.3  0.10:01.30 top
 9790 www-data  170 17500 5552 1272 D  0.3  0.60:00.43 php
 10015 www-data  160  284m 8448 1096 S  0.3  0.90:00.59 apache2

----------

 Dec 28 03:13:35 werewolf kernel: Out of Memory: Killed process 1080 (apache2).
 Dec 28 03:13:35 werewolf kernel: Out of Memory: Killed process 25021  (apache2
).
 Dec 28 03:13:55 werewolf kernel: Out of Memory: Killed process 25084 (apache2).
 Dec 28 03:13:55 werewolf kernel: Out of Memory: Killed process 25116 (apache2).
 Dec 28 03:14:28 werewolf kernel: Out of Memory: Killed process 25087 (apache2).
 Dec 28 03:14:29 werewolf kernel: Out of Memory: Killed process 25164 (apache2).

----------

apache2.conf (parts):

ServerLimit 12

<IfModule worker.c>
StartServers         3
MaxClients         384
MinSpareThreads     20
MaxSpareThreads     50
ThreadsPerChild     32
MaxRequestsPerChild  10000
</IfModule>

AddOutputFilterByType LAYOUT text/html application/x-httpd-php
LayoutEndTag </BODY>
LayoutFooter /some_document.html

FastCgiServer /usr/lib/cgi-bin/php4
FastCgiConfig -idle-timeout 15
AddHandler php-fastcgi .php .php3 .php4
<Location /cgi-bin/php>
    SetHandler fastcgi-script
</Location>
Action php-fastcgi /cgi-bin/php
AddType application/x-httpd-php .php .php3 .php4

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

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------- Additional Comments From rob@alterlinks.fr  2007-02-12 11:05 -------
Sorry, it's not my intention to change the bug report into some sort of 
discussion forum.
I've upgraded yesterday PHP 5.2.0 to 5.2.1 and the problem disappeared. The 
other three Apache instances are using PHP 4.4.4, only the one instance having 
this memory problem was using 5.2.0.
Rob starts to look into the direction of PHP ...  

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

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wrowe@apache.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |INVALID




------- Additional Comments From wrowe@apache.org  2007-02-26 01:23 -------
1. you don't have to reopen the bug to add a question/comment, and your email
addresses are all out there to share experiences (users@httpd.a.o is a great
place to do this, too).  Bugzilla isn't a user support forum, it's a defect
tracing forum :)

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

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rpluem@apache.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO




------- Additional Comments From rpluem@apache.org  2005-12-28 22:59 -------
Please try to limit the memory of the httpd processes by setting ulimit -m
before starting httpd and limit the memory of processes created by the httpd
childs via RLimitMEM. This should give you a chance to do traces and get more
information about the root cause. For debugging httpd please see
http://httpd.apache.org/dev/debugging.html.

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

Posted by bu...@apache.org.
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ruby@joker.linuxstuff.pl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|                            |INVALID




------- Additional Comments From ruby@joker.linuxstuff.pl  2006-01-20 21:43 -------
This bug was caused by hardware problem and wasn't Apache fault. Sorry for 
inconvience.

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

Posted by bu...@apache.org.
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gabriel@oxeva.fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |




------- Additional Comments From gabriel@oxeva.fr  2007-02-07 07:15 -------
(In reply to comment #5)
> This bug was caused by hardware problem and wasn't Apache fault. Sorry for 
> inconvience.

What is this hardware problem ?

I have exactly the same problem, using apache 2.2.4 and the worker MPM. On in a
while one of the httpd children consume all the memory in a few seconds. I am
running a pool of apache servers, and the problem occurs randomly on these,
which make me thinks it's not a hardware issue. (I had some bad memory problem
and the kernel panics, triggered by Machine Check events in my case, no weird
process behavior or things like a process eating up memory).



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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

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------- Additional Comments From rpluem@apache.org  2005-12-30 02:10 -------
(In reply to comment #2)

[..cut..]

> 
> I've added this two lines:
> 
> ulimit -S -m 25600
> ulimit -H -m 25600
> 
> on top of apache2ctl script (which actually only calls "/usr/sbin/apache2 -k 
> start"), without any result. Top still shows apache2 processes with resident 
> size >= 30Mb. It already crashed our server two times, here's top output in last 

Ups. I just traced ulimit of bash and it does not seem to set the correct limit.
It sets RLIMIT_RSS. ulimit -v sets RLIMIT_AS which also does not seem completely
correct to me, but this is at least checked by the brk syscall. So please try
again with ulimit -v.
Anyway it may be hard to find out the cause for this as you are using a fastcgi
module as a third party module.

[..cut..]

> 
> We have some info that may be useful though. From time to time appear apache 
> processes consuming a lot of memory. They grow in time, mostly exiting normally, 
> so I'm not sure they're related to this bug. But I guess that's better than 
> nothing. Below is a trace of one of this kind of processes.

Can you catch such processes with gdb and sent a backtrace or even better try to
catch the whole flow with ltrace?

[..cut..]

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

Posted by bu...@apache.org.
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------- Additional Comments From juice@tpi.pl  2005-12-30 18:21 -------
i work with Michal (first post author) to solve this bug on our server.

Today i moved to prefork apache + mod_php and the bug is still there, so this 
is not about fastcgi or threads issue.

Its free hosting server, so it is likely somebody is doing something strange 
to make it happen. 

I tried limiting apache with -v, and it works, but to even load it i need to 
incrase its virtual memory to around 40 MB or something to load all libs and 
such, and so even simple scripts can run. (when i set it so high though, a lot 
of apache process eating memory are still there, but it should stop the one 
that is crashing the box)

I think the problem has two parts:

One is a lot of apache process that has more than initial 4MB (thats how much 
prefork apache process has when i start it), are in memory. In just few 
minutes they have usually around 10-15MB each, and are moving from 4MB to 15MB 
slowly. (some of them are moving there faster, some slower)

of course this is just making this box work slow, but not crashing.

Another issue is happening few times per day, one apache process is going 
crazy, taking all available memory, crashing the box in around 3-4 seconds.

Its hard to trace it, becouse there are other not-so-dangerous too big apache 
process (also some kind of bug or misconfiguration issue i guess). Hard to 
predict which one will sudennly go crazy and trace it, we would have to trace 
all new processes, and thats not possible.

now, since i set -v limit, i hope this box-crashing bug (the first one) wont 
happen again, but i still have no idea why these apache processes are growing 
with time, from 4MB to even 15MB... looks like some memory leak, becouse when 
i strace them, they are sometimes doing nothing, and still taking 15MB of 
memory, compared to 4MB memory.

It seems similar to apache-mpm-worker, but with other numbers - with worker it 
was around 10MB or so initially growing up to 70MB. And also one crazy  
happening few times a day.


thanks for the -v tip, now i wait to see if server is still crashing or not, 
but the other memory eating apach processes issue is still there. I dont know 
is it connected to the one that is taking ALL memory in seconds, but it might 
be.

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

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------- Additional Comments From ruby@joker.linuxstuff.pl  2005-12-29 23:53 -------
(In reply to comment #1)
> Please try to limit the memory of the httpd processes by setting ulimit -m
> before starting httpd and limit the memory of processes created by the httpd
> childs via RLimitMEM. This should give you a chance to do traces and get more
> information about the root cause. For debugging httpd please see
> http://httpd.apache.org/dev/debugging.html.

I've added this two lines:

ulimit -S -m 25600
ulimit -H -m 25600

on top of apache2ctl script (which actually only calls "/usr/sbin/apache2 -k 
start"), without any result. Top still shows apache2 processes with resident 
size >= 30Mb. It already crashed our server two times, here's top output in last 
4 seconds:

 top - 22:03:16 up 1 day,  1:33,  2 users,  load average: 8.26, 6.90, 4.71
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 23439 www-data  19   0  372m  94m 1820 S 28.3 10.7   0:08.90 apache2

 top - 22:03:18 up 1 day,  1:33,  2 users,  load average: 9.76, 7.23, 4.83
 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 23439 www-data  19   0  551m 273m 1820 S 53.1 30.9   0:09.97 apache2
  132 root      15   0     0    0    0 D  9.9  0.0   0:27.16 kswapd0

This apache process was spawned after 22:03:14, then it consumed 273Mb of memory 
in about 4 seconds, and finally frozen our box (probably taking rest of memory).

In this situation you understand it's hard to deliver any debug information. I'm 
suprised that ulimit doesn't work with apache, maybe we use it the wrong way?

We have some info that may be useful though. From time to time appear apache 
processes consuming a lot of memory. They grow in time, mostly exiting normally, 
so I'm not sure they're related to this bug. But I guess that's better than 
nothing. Below is a trace of one of this kind of processes.

 # ls /proc/9200/task
 9200  9211  9214  9215  9224  9233

 # strace -p 9200
 Process 9200 attached - interrupt to quit
 read(4, 0xbfc73f57, 1)                  = ? ERESTARTSYS (To be restarted)
 --- SIGTERM (Terminated) @ 0 (0) ---
 sigreturn()                             = ? (mask now HUP INT QUIT USR1 ALRM 
STKFLT CHLD CONT TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR?)
 futex(0xb7024bf8, FUTEX_WAIT, 9202, NULL) = 0
 futex(0xb6824bf8, FUTEX_WAIT, 9203, NULL) = 0
 futex(0xb5824bf8, FUTEX_WAIT, 9205, NULL) = 0
 munmap(0xb7025000, 8388608)             = 0
 futex(0xb5024bf8, FUTEX_WAIT, 9206, NULL) = 0
 munmap(0xa6825000, 8388608)             = 0
 munmap(0xb6825000, 8388608)             = 0
 munmap(0xb6025000, 8388608)             = 0
 munmap(0xb5825000, 8388608)             = 0
 munmap(0xb5025000, 8388608)             = 0
 futex(0xb2824bf8, FUTEX_WAIT, 9211, NULL) = 0
 munmap(0xb4825000, 8388608)             = 0
 munmap(0xb4025000, 8388608)             = 0
 munmap(0xb3825000, 8388608)             = 0
 munmap(0xb3025000, 8388608)             = 0

 == more than 100 entries ==

 munmap(0xa562d000, 430080)              = 0
 munmap(0xa5a07000, 360448)              = 0
 munmap(0xa5d5e000, 315392)              = 0
 munmap(0xa604d000, 274432)              = 0
 munmap(0xa63dc000, 221184)              = 0
 munmap(0xa6547000, 180224)              = 0
 munmap(0xa6724000, 139264)              = 0
 brk(0x894d000)                          = 0x894d000
 brk(0x889e000)                          = 0x889e000
 brk(0x87ef000)                          = 0x87ef000
 brk(0x87e5000)                          = 0x87e5000
 brk(0x84c2000)                          = 0x84c2000
 brk(0x84c0000)                          = 0x84c0000
 brk(0x828a000)                          = 0x828a000
 brk(0x8286000)                          = 0x8286000
 brk(0x81a3000)                          = 0x81a3000
 brk(0x819b000)                          = 0x819b000
 write(7, "www.example.com 84."..., 1018) = 1018
 write(8, "111.111.111.111 - - [28/Dec/2005:"..., 3930) = 3930
 exit_group(0)                           = ?
 Process 9200 detached

 # strace -p 9211
 Process 9211 attached - interrupt to quit
 poll({fd=24, events=POLLOUT, revents=POLLOUT}?, 1, 60000) = 1
 sendfile(24, 25, [1982387], 1012962)    = 13140
 poll({fd=24, events=POLLOUT, revents=POLLOUT}?, 1, 60000) = 1
 sendfile(24, 25, [1995527], 999822)     = 13140

 == about 70 entries more ==

 poll({fd=24, events=POLLOUT, revents=POLLOUT}?, 1, 60000) = 1
 sendfile(24, 25, [2967887], 27462)      = 13140
 poll({fd=24, events=POLLOUT, revents=POLLOUT}?, 1, 60000) = 1
 sendfile(24, 25, [2981027], 14322)      = 13140
 poll({fd=24, events=POLLOUT, revents=POLLOUT}?, 1, 60000) = 1
 sendfile(24, 25, [2994167], 1182)       = 1182
 gettimeofday({1135804066, 798228}, NULL) = 0
 gettimeofday({1135804066, 798456}, NULL) = 0
 times({tms_utime=82, tms_stime=79, tms_cutime=0, tms_cstime=0}) = 1718650698
 gettimeofday({1135804066, 798886}, NULL) = 0
 shutdown(24, 1 /* send */)              = 0
 poll({fd=24, events=POLLIN, revents=POLLIN?, 1, 2000) = 1
 read(24, "", 512)                       = 0
 close(24)                               = 0
 close(25)                               = 0
 gettimeofday({1135804068, 189043}, NULL) = 0
 gettimeofday({1135804068, 189074}, NULL) = 0
 _exit(0)                                = ?
 Process 9211 detached

This poll/sendfile pattern is similar to all of them.

Please help us. :) We'll be happy with any sane workaround.

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DO NOT REPLY [Bug 38065] - Apache2 rapidly consumes a lot of memory and crashes the server

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------- Additional Comments From rob@alterlinks.fr  2007-02-09 13:45 -------
Me too I'm interrested in the answer if it was a hardware problem.
I'm using 4 Apache 1.3.37 instances on one machine and have the same problem;
Only one of them forks every now and then a child that eats 2Gb (=all) RAM in 
about 4 seconds time, then fills up the swap, slowing down the machine.
Eventually, I have the same message in syslog; 
Feb  9 22:07:17 diana kernel: Out of Memory: Killed process 32002 (httpd).

I have a hard time believing it's a hardware problem; only one of the 4 apache 
installs is doing this, about 10 to 15 times a day. This "problem" started 
about three weeks ago, never happened before.
The other three Apache instances are running fine.

Rob


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