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[Bug 48030] Segmentation Fault

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bugzilla at apache

Oct 20, 2009, 2:36 PM

Post #1 of 22 (910 views)
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[Bug 48030] Segmentation Fault

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #1 from Jeff Trawick <trawick[at]apache.org> 2009-10-20 14:36:52 UTC ---
Can you confirm that this occurs after a signal is received (such as when
shutting down httpd), and before the affected process has handled any
connections)?

(A parameter is updated by the kernel to indicate that an event is available;
the crash occurs because the event user data is NULL (i.e., no event really was
returned).)

I've seen that and have experimented with a fix, but have hoped (in vain so
far) to get the attention of some body from that Solaris kernel area to
explain.

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bugzilla at apache

Oct 20, 2009, 2:44 PM

Post #2 of 22 (891 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #2 from Nick <nicholas.dobson.ctr[at]navy.mil> 2009-10-20 14:44:41 UTC ---
This always occurs shortly after httpd starts up and before any connections are
made. Here is the output from error_log if it helps:

[Tue Oct 20 13:07:24 2009] [notice] Apache/2.2.14 (Unix) mod_ssl/2.2.14
OpenSSL/0.9.7d mod_jk/1.2.27 config
ured -- resuming normal operations
[Tue Oct 20 13:07:37 2009] [notice] child pid 2360 exit signal Segmentation
fault (11), possible coredump i
n /usr/local/apache2
[Tue Oct 20 13:07:39 2009] [notice] child pid 2362 exit signal Segmentation
fault (11), possible coredump i
n /usr/local/apache2
[Tue Oct 20 13:07:43 2009] [notice] child pid 2369 exit signal Segmentation
fault (11), possible coredump i
n /usr/local/apache2
[Tue Oct 20 13:07:48 2009] [notice] child pid 2378 exit signal Segmentation
fault (11), possible coredump i
n /usr/local/apache2
[Tue Oct 20 13:07:49 2009] [notice] child pid 2371 exit signal Segmentation
fault (11), possible coredump i
n /usr/local/apache2
[Tue Oct 20 13:08:04 2009] [warn] child process 2395 still did not exit,
sending a SIGTERM
[Tue Oct 20 13:08:05 2009] [notice] caught SIGTERM, shutting down

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bugzilla at apache

Oct 20, 2009, 6:49 PM

Post #3 of 22 (884 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #3 from Jeff Trawick <trawick[at]apache.org> 2009-10-20 18:49:40 UTC ---
Created an attachment (id=24403)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=24403)
test fix for bug 48030

zero out nget when kernel returns with nget set but no event has been filled in

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bugzilla at apache

Oct 20, 2009, 6:51 PM

Post #4 of 22 (885 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #4 from Jeff Trawick <trawick[at]apache.org> 2009-10-20 18:51:17 UTC ---
Please try the test fix attached to this problem report.

cd httpd-2.2.14/srclib/apr
patch -p0 < /path/to/patchfile
make && make install

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bugzilla at apache

Oct 21, 2009, 8:15 AM

Post #5 of 22 (875 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #5 from Nick <nicholas.dobson.ctr[at]navy.mil> 2009-10-21 08:15:42 UTC ---
I applied your patch and it seems to correct the issue. Processes are no longer
segfaulting and no errors printed to error_log. Thank you very much for you
quick response and assistance.

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bugzilla at apache

Oct 21, 2009, 8:16 AM

Post #6 of 22 (875 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #6 from Nick <nicholas.dobson.ctr[at]navy.mil> 2009-10-21 08:16:16 UTC ---
I applied your patch and it seems to correct the issue. Processes are no longer
segfaulting and no errors printed to error_log. Thank you very much for your
quick response and assistance.

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bugzilla at apache

Oct 23, 2009, 4:02 AM

Post #7 of 22 (844 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #7 from Bernd Leibing <bernd.leibing[at]uni-ulm.de> 2009-10-23 04:02:20 UTC ---
I have the same problem, but the test fix
doesn't help. All child processes are segfaulting after httpd starts up.
This only occurs on the heavy loaded production server. An identical server
without http requests works without problems

[Thu Oct 22 18:40:43 2009] [info] mod_ssl/2.2.14 compiled against Server:
Apache/2.2.14, Library: OpenSSL/0.9.8k
[Thu Oct 22 18:40:43 2009] [notice] Apache/2.2.14 (Unix) mod_ssl/2.2.14
OpenSSL/0.9.8k mod_qos/8.18 PHP/5.2.11 configured -- resuming normal operations
[Thu Oct 22 18:40:43 2009] [info] Server built: Oct 22 2009 18:05:11
[Thu Oct 22 18:40:43 2009] [notice] child pid 7306 exit signal Segmentation
fault (11)
[Thu Oct 22 18:40:43 2009] [notice] child pid 7307 exit signal Segmentation
fault (11)
[Thu Oct 22 18:40:44 2009] [notice] child pid 7340 exit signal Segmentation
fault (11)
[Thu Oct 22 18:40:44 2009] [notice] child pid 7343 exit signal Segmentation
fault (11)
[Thu Oct 22 18:40:44 2009] [notice] child pid 7344 exit signal Segmentation
fault (11)
[Thu Oct 22 18:40:44 2009] [notice] child pid 7345 exit signal Segmentation
fault (11)
[Thu Oct 22 18:40:44 2009] [notice] child pid 7341 exit signal Segmentation
fault (11)

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bugzilla at apache

Oct 23, 2009, 4:18 AM

Post #8 of 22 (844 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #8 from Jeff Trawick <trawick[at]apache.org> 2009-10-23 04:18:56 UTC ---
Bernd:
Which MPM (prefork, worker, event)?
Can you get a coredump and backtrace for one of the crashes?

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bugzilla at apache

Oct 23, 2009, 4:42 AM

Post #9 of 22 (837 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #9 from Bernd Leibing <bernd.leibing[at]uni-ulm.de> 2009-10-23 04:42:16 UTC ---
With a simple stresstest I managed to trigger
th bug on an otherwise unloaded server

I used:

ab -n 100 -c 20 http://myserver

Servertype: prefork MPM

# dbx /www/apache/bin/httpd core.httpd.122.17147
For information about new features see `help changes'
To remove this message, put `dbxenv suppress_startup_message 7.6' in your
.dbxrc
Reading httpd
core file header read successfully
Reading ld.so.1
Reading libz.so.1
Reading libssl.so.0.9.8
Reading libcrypto.so.0.9.8
Reading libdl.so.1
Reading libm.so.2
Reading libaprutil-1.so.0.3.9
Reading libexpat.so.0.1.0
Reading libapr-1.so.0.3.9
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 libresolv.so.2
Reading libgen.so.1
Reading libcmd.so.1
Reading libscf.so.1
Reading libdoor.so.1
Reading libuutil.so.1
Reading libmp.so.2
Reading libphp5.so
Reading libpq.so.5.1
Reading libmysqlclient.so.15.0.0
Reading libldap-2.4.so.2.4.2
Reading liblber-2.4.so.2.4.2
Reading libfreetype.so.6
Reading libX11.so.4
Reading libXpm.so.4
Reading libpng12.so.0.18.0
Reading libjpeg.so.62.0.0
Reading libkstat.so.1
Reading libsched.so.1
Reading libclntsh.so.10.1
dbx: internal warning: "(null)"::srcname(InfoOrigin_CMDLINE): value
"ntcontab.c" being set to "nt.c"
Reading libxml2.so.2.7.3
Reading libgcc_s.so.1
Reading libthread.so.1
Reading libsasl.so.1
Reading libgss.so.1
Reading libnnz10.so
Reading eaccelerator.so
t[at]1 (l[at]1) program terminated by signal SEGV (Segmentation Fault)
Current function is child_main
635 lr = pdesc[last_poll_idx++].client_data;
(dbx) where
current thread: t[at]1
=>[1] child_main(child_num_arg = 1), line 635 in "prefork.c"
[2] make_child(s = 0x8169fe0, slot = 1), line 758 in "prefork.c"
[3] startup_children(number_to_start = 39), line 776 in "prefork.c"
[4] ap_mpm_run(_pconf = 0x8162928, plog = 0x81a6a38, s = 0x8169fe0), line 997
in "prefork.c"
[5] main(argc = 3, argv = 0x8047d40), line 740 in "main.c"
(dbx)

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bugzilla at apache

Oct 23, 2009, 4:58 AM

Post #10 of 22 (837 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

Bernd Leibing <bernd.leibing[at]uni-ulm.de> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |bernd.leibing[at]uni-ulm.de

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bugzilla at apache

Oct 23, 2009, 5:56 AM

Post #11 of 22 (837 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #10 from Jeff Trawick <trawick[at]apache.org> 2009-10-23 05:56:15 UTC ---
Thanks. Were you running with the PR 48030 patch at the time of the crash?

Please load the core into dbx again and post the output from the following
commands:

(dbx) dump
(dbx) p *pollset
(dbx) p pollset->port_set[0]
(dbx) p pollset->port_set[1]
(dbx) p pollset->port_set[2]
(dbx) p pollset->port_set[3]
(dbx) p pollset->port_set[4]
(dbx) p pdesc[0]
(dbx) p pdesc[1]
(dbx) p pdesc[2]
(dbx) p pdesc[3]
(dbx) p pdesc[4]

Thanks!

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bugzilla at apache

Oct 23, 2009, 12:47 PM

Post #12 of 22 (818 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #11 from Bernd Leibing <bernd.leibing[at]uni-ulm.de> 2009-10-23 12:47:32 UTC ---
Yes I were running the PR 48030 patch.

dbx doesn't recognize a "p" command
(dbx) p *pollset
p: not found

I used the "print" command instead. Ok?
(dbx) dump
pdesc = (nil)
numdesc = 0
csd = 0x2
current_conn = 0x2
ptrans = 0x8440178
pollset = 0x843e208
sbh = 0x843e200
child_num_arg = 1
last_poll_idx = 0
status = 0
allocator = 0x843e0e8
i = -1
bucket_alloc = 0x8444188
lr = (nil)
(dbx) print *pollset
*pollset = {
pool = 0x843e170
nalloc = 2U
port_fd = 9
port_set = 0x843e248
result_set = 0x843e278
flags = 0
ring_lock = (nil)
query_ring = {
next = 0x843e2a0
prev = 0x843e2c0
}
add_ring = {
next = 0x843e22c
prev = 0x843e22c
}
free_ring = {
next = 0x843e234
prev = 0x843e234
}
dead_ring = {
next = 0x843e23c
prev = 0x843e23c
}
waiting = 0
}
(dbx) print pollset->port_set[0]
pollset->port_set[0] = {
portev_events = 1
portev_source = 4U
portev_pad = 4222U
portev_object = 3U
portev_user = 0x843e2c0
}
(dbx) print pollset->port_set[1]
pollset->port_set[1] = {
portev_events = 0
portev_source = 0
portev_pad = 0
portev_object = 0
portev_user = (nil)
}
(dbx) print pollset->port_set[2]
pollset->port_set[2] = {
portev_events = 138666480
portev_source = 57864U
portev_pad = 2115U
portev_object = 4274616192U
portev_user = 0x8071370
}
(dbx) print pollset->port_set[3]
pollset->port_set[3] = {
portev_events = 0
portev_source = 0
portev_pad = 0
portev_object = 0
portev_user = (nil)
}
(dbx) print pollset->port_set[4]
pollset->port_set[4] = {
portev_events = 0
portev_source = 0
portev_pad = 0
portev_object = 0
portev_user = (nil)
}
(dbx) print pdesc[0]
dbx: reference through nil pointer
(dbx) print pdesc[1]
dbx: cannot access address 0x14
(dbx) print pdesc[2]
dbx: cannot access address 0x28
(dbx) print pdesc[3]
dbx: cannot access address 0x3c
(dbx) print pdesc[4]
dbx: cannot access address 0x50
(dbx)

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bugzilla at apache

Oct 23, 2009, 1:03 PM

Post #13 of 22 (818 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #12 from Ruediger Pluem <rpluem[at]apache.org> 2009-10-23 15:03:14 CEST ---
This is bad: status and numdesc are both 0. What is apr_pollset_poll (or better
port in this case) want to tell us by this? There is an (no) event?
Or should we just do the same in this case as with APR_STATUS_IS_TIMEUP(status)
and APR_STATUS_IS_EINTR(status)?

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bugzilla at apache

Oct 23, 2009, 1:12 PM

Post #14 of 22 (818 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #13 from Jeff Trawick <trawick[at]apache.org> 2009-10-23 13:12:00 UTC ---
>Should we just do the same in this case as with APR_STATUS_IS_TIMEUP(status)
and APR_STATUS_IS_EINTR(status)?

uh, we better fix apr_pollset_poll()...

Meanwhile, at about the time Bernd was updating this PR I started to see some
of the nonsensical behavior.

I think the patch attached to this PR is one necessary fix, and this issue of
rv==0/pdesc==NULL is a different issue. Hopefully I'll have a better update in
the next few hours.

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bugzilla at apache

Oct 23, 2009, 2:40 PM

Post #15 of 22 (818 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #14 from Jeff Trawick <trawick[at]apache.org> 2009-10-23 14:40:19 UTC ---
This is one of the more craptastic things I've seen in a while :(

S10 U5, Sun Studio 12, x86 (running in VMWare Fusion, though I doubt that has
anything to do with it)

port_getn() returns -18857291
(so says fprintf; if I dbx it or truss it then port_getn() returns normal
values)

APR 1.3.8 and previous:

They checked for rc == -1 to catch errors. Unless you ran it under truss or
dbx, that logic didn't run. (I wondered why there was the special case "else
if (nget == 0) { rv = APR_TIMEUP; }").

APR 1.3.9:

This checks for rc < 0 to catch errors. Apparently that logic catches things
that aren't errors, and unless errno happens to be one of a couple of magic
values real events won't be seen, and then the proper event won't ever be
associated again.

--

I wonder if I could have a compiler bug that somehow is worked around when
running under dbx or truss? dbx I could believe, but I don't know about truss.
I need to play outside of APR, and also try other service levels of S10.

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bugzilla at apache

Oct 23, 2009, 2:48 PM

Post #16 of 22 (818 views)
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[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #15 from Jeff Trawick <trawick[at]apache.org> 2009-10-23 14:48:31 UTC ---
Bernd and Nick, could you please update the PR with your Solaris 10 update
levels?

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bugzilla at apache

Oct 24, 2009, 3:44 AM

Post #17 of 22 (800 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #16 from Bernd Leibing <bernd.leibing[at]uni-ulm.de> 2009-10-24 03:44:09 UTC ---
We use Solaris 10 10/08
Upgrade to the newest patchlevel is doable
if necessary.

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bugzilla at apache

Oct 24, 2009, 4:39 AM

Post #18 of 22 (795 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #17 from Jeff Trawick <trawick[at]apache.org> 2009-10-24 04:39:01 UTC ---
Hi Bernd,

We'll track your problem with bug 48029.

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bugzilla at apache

Nov 2, 2009, 1:47 PM

Post #19 of 22 (512 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #18 from Nick <nicholas.dobson.ctr[at]navy.mil> 2009-11-02 13:47:36 UTC ---
(In reply to comment #15)
> Bernd and Nick, could you please update the PR with your Solaris 10 update
> levels?

SunOS 5.10 Generic_141414-10 sun4v sparc

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bugzilla at apache

Nov 6, 2009, 2:37 AM

Post #20 of 22 (405 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

--- Comment #19 from Markus Schiegl <apache[at]schiegl.com> 2009-11-06 02:37:47 UTC ---
I have/had the same issues. HTTPD 2.2.14 immediately cored on startup (2.2.13
didn't)

...
[Fri Nov 06 07:05:06 2009] [notice] child pid 27488 exit signal Segmentation
fault (11), possible coredump in /c/apache/versions/2.2.14/mpm-worker
...

pstack output:
ff0cc1d4 __pollsys (ffbf9688, 0, ffbf96f0, 0, 0, 0) + 8
ff067b68 pselect (ffbf9688, ff134630, ff134630, 0, ffbf96f0, 0) + 1c8
ff067ee0 select (0, 0, 0, 0, ffbf9758, 7a120) + a0
ff2fbf74 apr_sleep (7a120, 0, 0, 0, 0, 20000) + 78
0005e794 ???????? (10cb10, 14bfc8, 0, 77f30, 0, 8d000)
0005ebec ???????? (1d4c1, 10bec8, 8fc00, 8d000, 8d280, 2)
0005f170 ???????? (9cad0, 0, 0, ffffffff, 1, 8d000)
0005f20c ???????? (2, 14bf70, 90000, 8d000, 0, 0)
0005ffc0 ap_mpm_run (2, 4, 0, 8d258, 0, 8fdcc) + 1e8
0002925c main (0, 8bc00, 8d000, 98c60, 707a0, 0) + a1c
00028728 _start (0, 0, 0, 0, 0, 0) + 108

but only if worker is been used (event and prefork work so far). Applied the
patch and this fixed it. This is a "Solaris 10 5/09 s10s_u7wos_08 SPARC
Generic_139555-08 sun4u".

Thank you very much!

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bugzilla at apache

Nov 13, 2009, 7:27 PM

Post #21 of 22 (220 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

Jeff Trawick <trawick[at]apache.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED

--- Comment #20 from Jeff Trawick <trawick[at]apache.org> 2009-11-13 19:26:56 UTC ---
now fixed in apr 1.3 branch

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Nov 13, 2009, 7:27 PM

Post #22 of 22 (220 views)
Permalink

[Bug 48030] Segmentation Fault [In reply to]

https://issues.apache.org/bugzilla/show_bug.cgi?id=48030

Jeff Trawick <trawick[at]apache.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |CLOSED

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