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Posted to bugs@httpd.apache.org by bu...@apache.org on 2016/07/11 02:18:36 UTC
[Bug 59840] New: Segmentation fault during the request processing
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
Bug ID: 59840
Summary: Segmentation fault during the request processing
Product: Apache httpd-2
Version: 2.4.23
Hardware: Sun
OS: Solaris
Status: NEW
Severity: major
Priority: P2
Component: mod_http2
Assignee: bugs@httpd.apache.org
Reporter: k.j.chernov@gmail.com
SunOS 5.10 Generic_150401-20 i86pc
Hi.
After turning on mod_http2 and enabling h2 protocol, I've noticed child crashes
approx. once per day:
[2016-07-08 21:07:10.035281] [core:notice] [pid 15804:tid 1] AH00051: child pid
1617 exit signal Segmentation fault (11), possible coredump in
/pub/apache/cores
[2016-07-09 18:13:12.624654] [core:notice] [pid 15804:tid 1] AH00051: child pid
675 exit signal Segmentation fault (11), possible coredump in /pub/apache/cores
Got two core dumps for now:
$ mdb core.apache.httpd.1617.1467990419
Loading modules: [ ld.so.1 libc.so.1 libuutil.so.1 ]
> ::stack
libcrypto.so.1.0.0`X509_get_ext_d2i()
mod_ssl.so`modssl_var_extract_san_entries+0x56()
mod_ssl.so`ssl_hook_Fixup+0x1b9()
ap_run_fixups+0x61()
ap_process_request_internal+0xd08()
ap_process_async_request+0x6f7()
ap_process_request+0x24()
mod_http2.so`h2_task_process_request+0x3fd()
mod_http2.so`h2_task_process_conn+0x228()
ap_run_process_connection+0x61()
mod_http2.so`h2_task_do+0x5e2()
mod_http2.so`execute+0x50()
libapr-1.so.0.5.2`dummy_worker+0x30()
libc.so.1`_thr_setup+0x5b()
libc.so.1`_lwp_start()
$ mdb core.apache.httpd.675.1468066381
Loading modules: [ ld.so.1 libc.so.1 libuutil.so.1 ]
> ::stack
libcrypto.so.1.0.0`X509_get_subject_name()
mod_ssl.so`ssl_hook_Fixup+0x19f()
ap_run_fixups+0x61()
ap_process_request_internal+0xd08()
ap_process_async_request+0x6f7()
ap_process_request+0x24()
mod_http2.so`h2_task_process_request+0x3fd()
mod_http2.so`h2_task_process_conn+0x228()
ap_run_process_connection+0x61()
mod_http2.so`h2_task_do+0x5e2()
mod_http2.so`execute+0x50()
libapr-1.so.0.5.2`dummy_worker+0x30()
libc.so.1`_thr_setup+0x5b()
libc.so.1`_lwp_start()
>
Tested with both 2.4.18/2.4.23, openssl 1.0.2g/1.0.2h.
If there's anything more I can do -- will be glad to help.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #16 from Eric Covener <co...@gmail.com> ---
(In reply to Konstantin J. Chernov from comment #15)
> After more than a week of stable work, there were 3 segfaults yesterday, all
> with the same stack:
> > ::stack
> libc.so.1`_read+0xa()
> ap_mpm_podx_check+0x38()
> child_main+0x418()
> make_child+0x143()
> perform_idle_server_maintenance+0x67f()
> server_main_loop+0x346()
> event_run+0x320()
> ap_run_mpm+0x71()
> main+0xe89()
> _start+0x6c()
>
> I'm not really sure they are somehow connected to mod_http2, though without
> mod_http2 there are no segfaults at all.
That is not the crashing thread, there must be some other that looks a little
more suspicious.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #6 from Konstantin J. Chernov <k....@gmail.com> ---
Created attachment 34074
--> https://bz.apache.org/bugzilla/attachment.cgi?id=34074&action=edit
pstack output of coredumps
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #15 from Konstantin J. Chernov <k....@gmail.com> ---
After more than a week of stable work, there were 3 segfaults yesterday, all
with the same stack:
> ::stack
libc.so.1`_read+0xa()
ap_mpm_podx_check+0x38()
child_main+0x418()
make_child+0x143()
perform_idle_server_maintenance+0x67f()
server_main_loop+0x346()
event_run+0x320()
ap_run_mpm+0x71()
main+0xe89()
_start+0x6c()
I'm not really sure they are somehow connected to mod_http2, though without
mod_http2 there are no segfaults at all.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #10 from Konstantin J. Chernov <k....@gmail.com> ---
Right after enabling http2 again, got a few more segfaults :(
Here's the latest one (+2 more with the same backtraces as in my previous
comments):
> ::stack
libaprutil-1.so.0.5.4`apr_brigade_cleanup+0x43()
libaprutil-1.so.0.5.4`brigade_cleanup+0x18()
libapr-1.so.0.5.2`run_cleanups+0x3c()
libapr-1.so.0.5.2`apr_pool_destroy+0x57()
eor_bucket_destroy+0x2a()
libaprutil-1.so.0.5.4`apr_brigade_cleanup+0x60()
ap_process_request_after_handler+0xc6()
ap_process_async_request+0x79f()
ap_process_request+0x24()
mod_http2.so`h2_task_process_request+0x3fd()
mod_http2.so`h2_task_process_conn+0x228()
ap_run_process_connection+0x61()
mod_http2.so`h2_task_do+0x5e2()
mod_http2.so`execute+0x50()
libapr-1.so.0.5.2`dummy_worker+0x30()
libc.so.1`_thr_setup+0x5b()
libc.so.1`_lwp_start()
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
cbarbara@okta.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |cbarbara@okta.com
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #23 from Konstantin J. Chernov <k....@gmail.com> ---
I've looked through the logs: out of 5 crashes we had during the last week,
there were only one crash that corresponds with the warning from mod_http2:
[2016-09-10 14:34:41.832137] [http2:warn] [pid 10635:tid 91] [C:AB0Zx5UDdAA]
AH03198: h2_mplx(172): release, waiting for 87865 seconds now for 1 h2_workers
to return, have still 21 tasks outstanding
But that was not written by the process(PID/TID) that crashed, as the messages
from this pid/tid appears further in the logs.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #21 from Konstantin J. Chernov <k....@gmail.com> ---
Created attachment 34222
--> https://bz.apache.org/bugzilla/attachment.cgi?id=34222&action=edit
three more full pstack outputs
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #9 from Konstantin J. Chernov <k....@gmail.com> ---
There were no segfaults since 29/07/2016 (the date when I disabled http2
module).
I assume the problem is not caused by 2.4.23 itself :(
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #1 from Stefan Eissing <st...@eissing.org> ---
Thanks for the report. There seem to be issues with concurrent access to SSL
variables when SSLOptions StdEnvVars is active.
I have to check back with the mod_ssl devs on how to best mitigate this issue.
For now, you may try removing the 'StdEnvVars' option - if your application can
live with it - and test if that fixes the issue.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #18 from Konstantin J. Chernov <k....@gmail.com> ---
I've attached full pstack of one of three coredumps:
core.apache.httpd.12673.1473072482.stack
Hopefully it will give more valuable info.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
Michael Kaufmann <ap...@michael-kaufmann.ch> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |apache-bugzilla@michael-kau
| |fmann.ch
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #14 from Konstantin J. Chernov <k....@gmail.com> ---
I've replaced modules/http2 from https://github.com/apache/httpd/tree/2.4.x
(hopefully, this link is correct) and rebuilt the apache with the rest of the
sources left unchanged, then replaced single mod_http2.so on prod environment.
Will see if there are any changes.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #2 from Konstantin J. Chernov <k....@gmail.com> ---
Thanks for the advice!
I removed StdEnvVars from the SSLOptions, will see if there are any changes.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #8 from Konstantin J. Chernov <k....@gmail.com> ---
Stefan,
thanks for the reply, I'll disable h2 tomorrow and leave it disabled for about
a week.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #20 from Eric Covener <co...@gmail.com> ---
(In reply to Stefan Eissing from comment #19)
> Hmm, I do not see it. Someone with better eyes than me?
t94 is suspicious
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #7 from Stefan Eissing <st...@eissing.org> ---
These are all very weird places. I would ask you to disable h2 for the time
being and check if 2.4.23 runs as stable on your platform as 2.4.18 did. Let's
just verify that there not something else here going on.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
Stefan Eissing <st...@eissing.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
--- Comment #24 from Stefan Eissing <st...@eissing.org> ---
Since the mentioned releases, various bugs have been identified and fixed that
could explain the observed behaviour. Also fuzzing is being done for the HTTP/2
implementation which improved robustness.
If there is no new data to report on a current version, I'd like to close this
ticket.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #3 from Konstantin J. Chernov <k....@gmail.com> ---
Got another segfault yesterday, though I'm not sure whether it is related to
the original problem:
[2016-07-12 23:58:06.817849] [core:notice] [pid 15804:tid 1] AH00051: child pid
29484 exit signal Segmentation fault (11), possible coredump in
/pub/apache/cores
$ mdb core.apache.httpd.29484.1468346277
> ::stack
mod_http2.so`h2_brigade_mem_size+0x2e()
mod_http2.so`h2_conn_io_pass+0x33b()
mod_http2.so`on_send_data_cb+0xa45()
libnghttp2.so.14.8.0`nghttp2_session_mem_send_internal+0x165()
libnghttp2.so.14.8.0`nghttp2_session_send+0x59()
mod_http2.so`h2_session_send+0x68()
mod_http2.so`h2_session_process+0x1863()
mod_http2.so`h2_conn_run+0x56()
mod_http2.so`h2_h2_process_conn+0x1122()
ap_run_process_connection+0x61()
process_socket+0x4ab()
worker_thread+0x351()
libapr-1.so.0.5.2`dummy_worker+0x30()
libc.so.1`_thr_setup+0x5b()
libc.so.1`_lwp_start()
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #4 from Stefan Eissing <st...@eissing.org> ---
Unless we are talking about memory corruption, the second one is unrelated.
Since this is the first one of that kind, I am unsure of the reason.
Has this ever happened since?
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #19 from Stefan Eissing <st...@eissing.org> ---
Hmm, I do not see it. Someone with better eyes than me?
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
Eric Covener <co...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |CLOSED
Status|NEW |RESOLVED
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #22 from Stefan Eissing <st...@eissing.org> ---
Just for completeness since I did not ask yet: do you see anything in the error
logs from mod_http2. Any warning?
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #17 from Konstantin J. Chernov <k....@gmail.com> ---
Created attachment 34203
--> https://bz.apache.org/bugzilla/attachment.cgi?id=34203&action=edit
core.apache.httpd.12673.1473072482.stack
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
juniorolalde55@gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #11 from Stefan Eissing <st...@eissing.org> ---
Thanks Konstantin. At least it's clear that http2 is the culprit and the
backtrace points to connection shutdown. Have do analyze that a bit more...
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #12 from Stefan Eissing <st...@eissing.org> ---
Konstantin,
are you able to build a new mod_http2 for testing? The current state of branch
2.4.x contains a cleanup fix that might address the issues you observe.
As an alternative, you can also you the github release at
https://github.com/icing/mod_h2/releases/tag/v1.6.1 if you have apxs and
autoconf on your system.
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #13 from Konstantin J. Chernov <k....@gmail.com> ---
Hi.
Will it be enough to replace mod_http2 folder contents from
https://github.com/apache/httpd/tree/trunk/modules/http2 and recompile the
Apache?
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[Bug 59840] Segmentation fault during the request processing
Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=59840
--- Comment #5 from Konstantin J. Chernov <k....@gmail.com> ---
Stefan,
after upgrading to 2.4.23 and turning on http2 module I've got several
segfaults, even though the number of them reduced after I turned off
StdEnvVars. Before upgrade, I was using 2.4.18 without http2, and never had a
segfault.
Here are the backtraces (not mentioning one from my last comment):
$ mdb core.apache.httpd.1407.1468993750
Loading modules: [ ld.so.1 libc.so.1 libuutil.so.1 ]
> ::stack
libc.so.1`_read+0xa()
ap_mpm_podx_check+0x38()
child_main+0x418()
make_child+0x143()
perform_idle_server_maintenance+0x67f()
server_main_loop+0x346()
event_run+0x320()
ap_run_mpm+0x71()
main+0xe89()
_start+0x6c()
$ mdb core.apache.httpd.14988.1469184078
Loading modules: [ ld.so.1 libc.so.1 libuutil.so.1 ]
> ::stack
libc.so.1`_read+0xa()
ap_mpm_podx_check+0x38()
child_main+0x418()
make_child+0x143()
perform_idle_server_maintenance+0x67f()
server_main_loop+0x346()
event_run+0x320()
ap_run_mpm+0x71()
main+0xe89()
_start+0x6c()
$ mdb core.apache.httpd.23206.1469009815
Loading modules: [ ld.so.1 libc.so.1 libuutil.so.1 ]
> ::stack
mod_deflate.so`deflate_out_filter+0x2301()
mod_filter.so`filter_harness+0x1dc()
ap_pass_brigade+0xbc()
end_output_stream+0xb8()
ap_finalize_request_protocol+0x32()
ap_die_r+0x32()
ap_process_async_request+0x793()
ap_process_request+0x24()
mod_http2.so`h2_task_process_request+0x3fd()
mod_http2.so`h2_task_process_conn+0x228()
ap_run_process_connection+0x61()
mod_http2.so`h2_task_do+0x5e2()
mod_http2.so`execute+0x50()
libapr-1.so.0.5.2`dummy_worker+0x30()
libc.so.1`_thr_setup+0x5b()
libc.so.1`_lwp_start()
I've also included pstack output.
If there's any info I can provide to make things more clear, I'll be glad to do
so.
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