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Posted to bugs@httpd.apache.org by bu...@apache.org on 2012/06/19 14:31:18 UTC
[Bug 53435] New: Memory leak when mod_ssl is used
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
Priority: P2
Bug ID: 53435
Assignee: bugs@httpd.apache.org
Summary: Memory leak when mod_ssl is used
Severity: normal
Classification: Unclassified
OS: Linux
Reporter: tadanori2007@yahoo.com
Hardware: PC
Status: NEW
Version: 2.4.1
Component: mod_ssl
Product: Apache httpd-2
Hello,
I installed httpd 2.4.2 on CentOS6.2(64bit).
It seems like httpd leaks memory when mod_ssl is used.
When I start up httpd with mod_ssl, and when I issue "apachectl graceful",
it seems like httpd leaks memory.
If I issue "apachectl graceful" 1000 times, ps command shows
the memory usage gets bigger like below:
====Before 1000 times graceful restart====
# ps -elfy | head -1
S UID PID PPID C PRI NI RSS SZ WCHAN STIME TTY TIME
CMD
# ps -elfy | grep httpd | grep -v grep
S root 3816 1 0 80 0 4136 25683 poll_s 15:00 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 3818 3816 0 80 0 5216 111748 pipe_w 15:00 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 3819 3816 0 80 0 5220 111748 pipe_w 15:00 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 3820 3816 0 80 0 5220 111748 pipe_w 15:00 ? 00:00:00
/opt/testhttpd/bin/httpd
#
====After 1000 times graceful restart====
# ps -elfy | head -1
S UID PID PPID C PRI NI RSS SZ WCHAN STIME TTY TIME
CMD
# ps -elfy | grep httpd | grep -v grep
S root 3816 1 6 80 0 97320 48673 poll_s 15:00 ? 00:01:23
/opt/testhttpd/bin/httpd
S daemon 28584 3816 0 80 0 97448 134738 pipe_w 15:19 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 28585 3816 0 80 0 95416 134738 pipe_w 15:19 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 28588 3816 0 80 0 97460 134738 pipe_w 15:19 ? 00:00:00
/opt/testhttpd/bin/httpd
#
You can reproduce this by:
1. start httpd with mod_ssl loaded.
2. issue "apachectl graceful" 1000 times.
I configured my httpd with following:
# ./configure --prefix=/opt/testhttpd --with-included-apr
If I start up httpd without mod_ssl, memory usage does not get bigger
even after 1000 times graceful restart.
The evidence is below:
====Before 1000 times graceful restart====
# ps -elfy | head -1
S UID PID PPID C PRI NI RSS SZ WCHAN STIME TTY TIME
CMD
# ps -elfy | grep httpd | grep -v grep
S root 25061 1 0 80 0 2632 18365 poll_s 15:43 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 25063 25061 0 80 0 4504 104430 pipe_w 15:43 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 25064 25061 0 80 0 4504 104430 pipe_w 15:43 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 25065 25061 0 80 0 4508 104430 pipe_w 15:43 ? 00:00:00
/opt/testhttpd/bin/httpd
#
====After 1000 times graceful restart====
# ps -elfy | head -1
S UID PID PPID C PRI NI RSS SZ WCHAN STIME TTY TIME
CMD
# ps -elfy | grep httpd | grep -v grep
S daemon 17566 25061 0 80 0 4784 104430 pipe_w 16:01 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 17567 25061 0 80 0 4788 104430 pipe_w 16:01 ? 00:00:00
/opt/testhttpd/bin/httpd
S daemon 17568 25061 0 80 0 4792 104430 pipe_w 16:01 ? 00:00:00
/opt/testhttpd/bin/httpd
S root 25061 1 0 80 0 3264 18365 poll_s 15:43 ? 00:00:06
/opt/testhttpd/bin/httpd
#
Are there memory leaks in mod_ssl module?
Thanks,
Tadanori
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
--- Comment #2 from Sebastian Wiedenroth <wi...@frubar.net> ---
Hi,
i believe to have run into the same issue.
Graceful restarts every 5 minutes fill up about 400mb of ram in a day.
With mdb and ::findleaks i've tracked it down to stacktraces like this:
ADDR BUFADDR TIMESTAMP THREAD
CACHE LASTLOG CONTENTS
811e40 80fd20 40b3df2f559484 1
4bd668 0 0
libumem.so.1`umem_cache_alloc_debug+0xfd
libumem.so.1`umem_cache_alloc+0xb3
libumem.so.1`umem_alloc+0x64
libumem.so.1`umem_malloc+0x3f
libcrypto.so.1.0.0`CRYPTO_malloc+0x5d
libcrypto.so.1.0.0`lh_insert+0x1fe
libcrypto.so.1.0.0`int_err_set_item+0x4f
libcrypto.so.1.0.0`ERR_load_strings+0x41
libssl.so.1.0.0`ERR_load_SSL_strings+0x2e
mod_ssl.so`ssl_hook_pre_config+0x30
ap_run_pre_config+0x60
main+0x905
_start+0x6c
Which sent me looking for ERR_free_strings().
It turns out that this was removed over 10 years ago in the following commit:
https://github.com/apache/httpd/commit/e2ee089fd414675144e347fc4624b1a665aac671
I have build 2.4.10 with this change reverted and it absolutly fixes the issue
for us.
All tests were done with 2.4.10 on SmartOS (Illumos) from pkgsrc and
openssl-1.0.1h.
I'm not sure if the reason for the removal is still valid (maybe something
changed in openssl).
Neither am I sure that reverting that commit won't break the error strings
(don't know how to test).
Of course I'm also wondering why this is not a bigger problem for other users,
but maybe they don't do graceful restarts that often ;-)
So maybe someone who knows a bit more on that topic can help here...
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
jkaluza@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jkaluza@redhat.com
--- Comment #3 from jkaluza@redhat.com ---
Thanks Sebastian. I've committed the fix based on your debugging in r1638772.
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
tadanori <ta...@yahoo.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|2.4.1 |2.4.2
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
Yann Ylavic <yl...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Yann Ylavic <yl...@gmail.com> ---
Backported to 2.4.11 in r1642404.
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
Sebastian Wiedenroth <wi...@frubar.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wiedi@frubar.net
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
--- Comment #1 from Kaspar Brand <as...@velox.ch> ---
This was also brought up on httpd-dev in October 2008 (with no final
conclusion, though):
http://mail-archives.apache.org/mod_mbox/httpd-dev/200810.mbox/%3C48F91F01.4010802@force-elite.com%3E
(For the sake of reference: a link to your original post to the users list -
http://mail-archives.apache.org/mod_mbox/httpd-users/201206.mbox/%3C1339507051.6642.YahooMailClassic%40web140201.mail.bf1.yahoo.com%3E
- would have been appreciated.)
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[Bug 53435] Memory leak when mod_ssl is used
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53435
--- Comment #4 from jkaluza@redhat.com ---
Proposed to 2.4.x.
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