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Posted to bugs@httpd.apache.org by bu...@apache.org on 2014/04/05 12:01:48 UTC
[Bug 56351] New: Segmentation fault when using mod_auth_form
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
Bug ID: 56351
Summary: Segmentation fault when using mod_auth_form
Product: Apache httpd-2
Version: 2.4-HEAD
Hardware: PC
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: Core
Assignee: bugs@httpd.apache.org
Reporter: bitaround@gmail.com
Created attachment 31478
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31478&action=edit
error_log.txt
Using mod_auth_form in httpd.conf causes segmentation fault when accessing the
server.
I tested this in a fresh ubuntu virtual machine. This bug is easily
reproducible. This happens every time when httpd is started and the site is
accessed.
I tested this with httpd.conf configuration that is simplified and not fully
functional.
Originally I found this bug when trying to use mod_auth_form and session_dbd
with AuthBasicProvider ldap in Ubuntu Trusty. Changing AuthBasicProvider from
ldap to file worked in that machine, the site was working correctly after that.
Error log:
[core:notice] [pid 11321:tid 140385410832256] AH00051: child pid 11322 exit
signal Segmentation fault (11), possible coredump in /debug
Full log in attachment error_log.txt
GDB:
#2 ap_mpm_podx_check (pod=<optimized out>) at mpm_unix.c:535
See attachment gdb.txt for more information.
conf/httpd.conf (added this after default configuration):
LoadModule auth_form_module modules/mod_auth_form.so
CoreDumpDirectory /debug
MaxClients 1
ThreadsPerChild 1
ServerName testserver
DocumentRoot /var/www/html
LogLevel debug
<Location />
#AuthBasicProvider ldap
AuthBasicProvider file
AuthType form
AuthName test
Require valid-user
</Location>
Build process and configuration is documented in attachment build.txt
Server version: Apache/2.4.10-dev (Unix)
Server loaded: APR 2.0.0-dev
# uname -a
Linux test3 3.13.0-19-generic #40-Ubuntu SMP Mon Mar 24 02:36:06 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
See attachment info.txt for more information about versions.
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #4 from Yann Ylavic <yl...@gmail.com> ---
(In reply to bitaround from comment #1)
> Created attachment 31479 [details]
> gdb.txt
Could you please provide gdb's output of "thread appy all bt" so that we can
see the failing thread's backtrace?
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #18 from Dennis Clarke <dc...@blastwave.org> ---
Not sure if this helps :
(dbx) regs
current thread: t@1
current frame: [3]
g0-g1 0x0000000000000000 0x0000000000000003
g2-g3 0x0000000000000000 0x0000000000000000
g4-g5 0x0000000000001c00 0xffffffffff7fffff
g6-g7 0x0000000000000000 0xffffffff7df00200
o0-o1 0x0000000000000006 0xffffffff7ffff273
o2-o3 0x0000000000000001 0x0000000000000000
o4-o5 0xffffffff7df00200 0x0000000000000000
o6-o7 0xffffffff7fffe9b1 0x0000000100082a5c
l0-l1 0xffffffff7ffff273 0x0000000000000006
l2-l3 0xffffffff7ffff248 0x0000000100291d30
l4-l5 0x0000000100291d58 0x0000000000000000
l6-l7 0x0000000000000000 0xffffffff7eb45358
i0-i1 0x00000001002a8e20 0x000000010009fc78
i2-i3 0x00000001000a29d0 0x0000000100291d08
i4-i5 0x00000001002914f8 0x0000000000000000
i6-i7 0xffffffff7fffea81 0x00000001000a3eec
y 0x0000000000000000
ccr 0x0000000000000045
pc 0x0000000100082a5c:ap_mpm_podx_check+0x34 call read [PLT]
! 0x1001c0100
npc 0xffffffff7dddc85c:_readlink mov 90, %g1
May be worth looking at the memory contents if needed. The joy of having a
full core file means we can do that.
Looking at lwp#1 in thread 1 I see :
ffffffff7dddc858 _read (6, ffffffff7ffff273, 1, 0, ffffffff7df00200, 0) + c
0000000100082a5c ap_mpm_podx_check (1002a8e20, 10009fc78, 1000a29d0,
100291d08, 1002914f8, 0) + 34
So we could, if we wanted, look at contents of memory on the heap or
where ever :
(dbx) x 0xffffffff7ffff273
0xffffffff7ffff273: 0x010009fc
(dbx) x 0xffffffff7ffff273 / LX
0xffffffff7ffff273: 0x010009fc78000000
(dbx) x 0xffffffff7ffff273 / 16 x
0xffffffff7ffff273: 0x0100 0x09fc 0x7800 0x0000 0x0100 0x2a8e 0x2000 0x0000
0xffffffff7ffff283: 0x0100 0x2a8e 0x2000 0x0000 0x0100 0x1c78 0x8000 0x0000
Not sure what we are looking for however. If anything.
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #3 from bitaround@gmail.com ---
Created attachment 31481
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31481&action=edit
info.txt
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
Yann Ylavic <yl...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #22 from Yann Ylavic <yl...@gmail.com> ---
Backported to 2.4.10 with r1588247.
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #8 from Yann Ylavic <yl...@gmail.com> ---
I didn't figure out your configuration does not include all the needed
Authentication and Authorization modules.
Your configuration should load several modules like :
LoadModule authn_core_module modules/mod_authn_core.so
LoadModule authn_file_module modules/mod_authn_file.so
LoadModule authz_core_module modules/mod_authz_core.so
LoadModule authz_user_module modules/mod_authz_user.so
LoadModule auth_form_module modules/mod_auth_form.so
LoadModule session_module modules/mod_session.so
LoadModule request_module modules/mod_request.so
And then use :
AuthFormProvider file
instead of :
AuthBasicProvider file
You should refer to mod_auth_form documentation
(http://httpd.apache.org/docs/2.4/mod/mod_auth_form.html), or more generally to
the documentation for Authentication and Authorization
(http://httpd.apache.org/docs/2.4/howto/auth.html).
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #11 from bitaround@gmail.com ---
I correct: that r1531672 was not a bug.
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #13 from Michael van Rooyen <mi...@loot.co.za> ---
We're not using mod_auth_form, but are getting a SEGV in the same location,
only for us it's on graceful restart after log rotate:
(gdb) bt
#0 0x00a72410 in __kernel_vsyscall ()
#1 0x00d37b8b in read () from /lib/libpthread.so.0
#2 0x08095884 in ap_mpm_podx_check (pod=0x9b79208) at mpm_unix.c:535
#3 0x080a5cbe in child_main (child_num_arg=3) at worker.c:1341
#4 0x080a6acb in make_child (s=0x9b64ee8, slot=3) at worker.c:1427
#5 0x080a6b97 in startup_children (number_to_start=4) at worker.c:1452
#6 0x080a744a in server_main_loop (_pconf=0x9b400a8, plog=0x9b669b0,
s=0x9b64ee8) at worker.c:1752
Prior to that, the httpd runs fine. We've just upgraded to 2.4.9 from 2.2.x
and started getting this after the first log rotation.
Is it possible that the impact of this could be wider, and if so, will the
anticipated 2.4.10 change fix it, and are there any workarounds?
Apart from standard Apache modules, we do use an in-house developed module
that's designed to be thread safe, and has run in 2.x servers for 10+ years
without any issues. Thanks!
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #12 from Yann Ylavic <yl...@gmail.com> ---
Thanks; will be fixed in next 2.4.10.
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #5 from bitaround@gmail.com ---
Created attachment 31482
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31482&action=edit
gdb2.txt
thread appy all bt
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #7 from bitaround@gmail.com ---
Created attachment 31483
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31483&action=edit
gdb3.txt
(gdb) thread apply all bt
httpd.conf with:
LoadModule session_module modules/mod_session.so
LoadModule request_module modules/mod_request.so
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #14 from Eric Covener <co...@gmail.com> ---
(In reply to Michael van Rooyen from comment #13)
> We're not using mod_auth_form, but are getting a SEGV in the same location,
> only for us it's on graceful restart after log rotate:
>
> (gdb) bt
> #0 0x00a72410 in __kernel_vsyscall ()
> #1 0x00d37b8b in read () from /lib/libpthread.so.0
> #2 0x08095884 in ap_mpm_podx_check (pod=0x9b79208) at mpm_unix.c:535
> #3 0x080a5cbe in child_main (child_num_arg=3) at worker.c:1341
> #4 0x080a6acb in make_child (s=0x9b64ee8, slot=3) at worker.c:1427
> #5 0x080a6b97 in startup_children (number_to_start=4) at worker.c:1452
> #6 0x080a744a in server_main_loop (_pconf=0x9b400a8, plog=0x9b669b0,
> s=0x9b64ee8) at worker.c:1752
>
> Prior to that, the httpd runs fine. We've just upgraded to 2.4.9 from 2.2.x
> and started getting this after the first log rotation.
>
> Is it possible that the impact of this could be wider, and if so, will the
> anticipated 2.4.10 change fix it, and are there any workarounds?
>
> Apart from standard Apache modules, we do use an in-house developed module
> that's designed to be thread safe, and has run in 2.x servers for 10+ years
> without any issues. Thanks!
Open a new bug and get a backtrace of the thread that crashed, not the first
thread.
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #6 from Yann Ylavic <yl...@gmail.com> ---
You probably need to also load mod_session and mod_request with :
LoadModule session_module modules/mod_session.so
LoadModule request_module modules/mod_request.so
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
Yann Ylavic <yl...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
--- Comment #9 from Yann Ylavic <yl...@gmail.com> ---
The crash when AuthFormProvider is missing has been addressed by r1531672 and
proposed for backport.
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #15 from Dennis Clarke <dc...@blastwave.org> ---
Same sort of SEGV seen on Solaris 10 Sparc ( 64-bit ) with 2.4.10 thus :
trend-dev $ su -
Password:
Oracle Corporation SunOS 5.10 Generic Patch January 2005
# dbx /usr/local/bin/httpd
/var/crash/trend-dev/coredump/node_trend-dev-host_sun4v-zone_z_004-time_1413532243-pid_7566-uid_80-gid_80-fid_httpd.core
Reading httpd
core file header read successfully
Reading ld.so.1
Reading libpcre.so.1.0.1
Reading libaprutil-1.so.0.5.3
Reading libexpat.so.1.6.0
Reading libapr-1.so.0.5.1
Reading libuuid.so.1
Reading libsendfile.so.1
Reading librt.so.1
Reading libsocket.so.1
Reading libnsl.so.1
Reading libpthread.so.1
Reading libc.so.1
Reading libaio.so.1
Reading libmd.so.1
Reading libc_psr.so.1
Reading libmp.so.2
Reading libscf.so.1
Reading libdoor.so.1
Reading libuutil.so.1
Reading libgen.so.1
Reading libresolv.so.2
Reading libm.so.2
Reading libldap.so.5
Reading libthread.so.1
Reading libdl.so.1
Reading libsasl.so.1
Reading libmd_psr.so.1
Reading libplc4.so
Reading libnspr4.so
Reading libssl3.so
Reading libnss3.so
Reading libnssutil3.so
Reading libplds4.so
Reading mod_authn_file.so
Reading mod_authn_anon.so
Reading mod_authn_core.so
Reading mod_authz_host.so
Reading mod_authz_groupfile.so
Reading mod_authz_user.so
Reading mod_authz_core.so
Reading mod_access_compat.so
Reading mod_auth_basic.so
Reading mod_auth_digest.so
Reading mod_file_cache.so
Reading mod_cache.so
Reading mod_socache_shmcb.so
Reading mod_reqtimeout.so
Reading mod_ext_filter.so
Reading mod_include.so
Reading mod_filter.so
Reading mod_deflate.so
Reading libz.so.1.2.7
Reading mod_mime.so
Reading mod_log_config.so
Reading mod_logio.so
Reading mod_env.so
Reading mod_expires.so
Reading mod_headers.so
Reading mod_usertrack.so
Reading mod_unique_id.so
Reading mod_setenvif.so
Reading mod_version.so
Reading mod_proxy.so
Reading mod_proxy_connect.so
Reading mod_proxy_ftp.so
Reading mod_proxy_http.so
Reading mod_unixd.so
Reading mod_dav.so
Reading mod_status.so
Reading mod_autoindex.so
Reading mod_info.so
Reading mod_suexec.so
Reading mod_cgid.so
Reading mod_dav_fs.so
Reading mod_vhost_alias.so
Reading mod_negotiation.so
Reading mod_dir.so
Reading mod_actions.so
Reading mod_speling.so
Reading mod_userdir.so
Reading mod_alias.so
Reading mod_rewrite.so
Reading libphp5.so
Reading libmysqlclient.so.18.0.0
Reading libgmp.so.10.2.0
Reading libintl.so.8.1.1
Reading libX11.so.4
Reading libXpm.so.4
Reading libpng15.so.15.14.0
Reading libjpeg.so.9.0.0
Reading libssl.so.1.0.0
Reading libcrypto.so.1.0.0
Reading libcurl.so.4.3.0
Reading libidn.so.11.6.9
Reading libssh2.so.1.0.1
Reading libfreetype.so.6.10.0
Reading libxml2.so.2.9.0
Reading libiconv.so.2.5.1
Reading libgcc_s.so.1
Reading liblzma.so.5.0.5
Reading mod_ssl.so
Reading en_US.UTF-8.so.3
Reading methods_unicode.so.3
t@1 (l@1) terminated by signal SEGV (Segmentation Fault)
0xffffffff7dddc858: _read+0x000c: bcc,pt %icc,_read+0x20 !
0xffffffff7dddc86c
Current function is ap_mpm_podx_check
dbx: warning: can't find file
"/usr/local/build/httpd-2.4.10_SunOS5.10_sparcv9.002/server/mpm_unix.c"
dbx: warning: see `help finding-files'
(dbx) where
current thread: t@1
[1] _read(0x4, 0xffffffff7ffff273, 0x1, 0x100082a5c, 0x0, 0x1), at
0xffffffff7dddc858
[2] read(0x6, 0xffffffff7ffff273, 0x1, 0x0, 0xffffffff7df00200, 0x0), at
0xffffffff7ddca240
=>[3] ap_mpm_podx_check(pod = 0x1002a8e20), line 535 in "mpm_unix.c"
[4] child_main(child_num_arg = 2), line 2272 in "event.c"
[5] make_child(s = 0x100201158, slot = 2), line 2359 in "event.c"
[6] perform_idle_server_maintenance(), line 2556 in "event.c"
[7] server_main_loop(remaining_children_to_start = 0), line 2684 in "event.c"
[8] event_run(_pconf = 0x1001d6cb8, plog = 0x100204ea8, s = 0x100201158),
line 2743 in "event.c"
[9] ap_run_mpm(0x1001d6cb8, 0x100204ea8, 0x100201158, 0x100201158, 0x0, 0x0),
at 0x10003b540
[10] main(argc = 3, argv = 0xffffffff7ffffb48), line 777 in "main.c"
(dbx) quit
trend-dev #
That is the thread the SEGV'd and that back trace looks correct.
What other data is needed ?
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #19 from Eric Covener <co...@gmail.com> ---
AFAICT every thread but the one in mod_php was blocked, so it's probably the
crasher. I don't see any relationship to this bug, and mod_php is not something
we take bug reports for in this bugzilla.
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #21 from Dennis Clarke <dc...@blastwave.org> ---
Taking a quick glance at int ap_mpm_podx_check ( ap_pod_t *pod ) at :
http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__MPM.html
That function serves to "Check the extended pipe to determine if the process
has been signalled to die."
I also see :
http://ci.apache.org/projects/httpd/trunk/doxygen/structap__pod__t.html
So whereever the problem is that toses thirty core files a day it is deep
in the belly of the beast and possibly non-trivial to track down.
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #16 from Jeff Trawick <tr...@apache.org> ---
These backtraces that you'll see which show a crash in read() are not valid.
(You can't crash there.) They're backtraces of the main thread in a child, not
a backtrace of the thread that crashed. Just use pstack against the core on
Solaris.
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #1 from bitaround@gmail.com ---
Created attachment 31479
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31479&action=edit
gdb.txt
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #10 from bitaround@gmail.com ---
Changing "AuthBasicProvider ldap" to "AuthFormProvider ldap" or
"AuthBasicProvider file" to "AuthFormProvider file" fixes the problem in that
Ubuntu installation and this test configuration.
So this is a duplicate of #r1531672.
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
bitaround@gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://svn.apache.org/viewv
| |c?view=revision&revision=15
| |31672
Component|Core |mod_auth_form
Summary|Segmentation fault when |Segmentation fault when
|using mod_auth_form |AuthFormProvider isn't
| |specified
Severity|major |minor
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #20 from Dennis Clarke <dc...@blastwave.org> ---
Based on my experience dealing with the PHP people regarding this will be
futile.
Therefore there is little that can be done.
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
bitaround@gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
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[Bug 56351] Segmentation fault when using mod_auth_form
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #2 from bitaround@gmail.com ---
Created attachment 31480
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31480&action=edit
build.txt
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[Bug 56351] Segmentation fault when AuthFormProvider isn't specified
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=56351
--- Comment #17 from Dennis Clarke <dc...@blastwave.org> ---
Created attachment 32125
--> https://issues.apache.org/bugzilla/attachment.cgi?id=32125&action=edit
output from pstack on Solaris 10
output from
$ pstack time_1413532243-pid_7566-uid_80-gid_80-fid_httpd.core
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