Re: core dumps in 2.2.15 and above

[Achal Kumar <kumarachal@xxxxxxxxx>]

Actually, I take it back. We were able to reproduce the crash with 2.2.15 without the changes in rev 916627 but the frequency has gone down a little bit. Now if I stop the upstream content server it crashes 20% of the time. I am looking at the code changes between 2.2.14 and 2.2.15 but any help will be appreciated.

I am running it on red hat linux.

Achal

2011/3/9 Achal Kumar <kumarachal@xxxxxxxxx>

yes, I reverted the changes in rev 916627. I just changed all the calls from cleanup to destroy and I didn't see the issue any more. We are still validating this. The setup is very simple:

1. We are running a load of 1000 sessions with a loader using wgets.
2. Apache is configured using worker MPM and mod_proxy and we have two content servers each handling roughly 500 requests.
3. We shut down one content server and we see a core dump.

gdb) bt full
#0  0x0000003ac00306f7 in kill () from /lib64/libc.so.6
No symbol table info available.
#1  <signal handler called>
No symbol table info available.
#2  0x00002aaca7a2db89 in apr_brigade_cleanup (data="" optimized out>) at
buckets/apr_brigade.c:44
        b = (apr_bucket_brigade *) 0x0
#3  0x00002aaca7c5b09d in run_cleanups (cref=0x1a99c068) at
memory/unix/apr_pools.c:2308
        c = (cleanup_t *) 0x0
#4  0x00002aaca7c5bb0e in apr_pool_destroy (pool=0x1a99c048) at
memory/unix/apr_pools.c:779
        active = <value optimized out>
        allocator = <value optimized out>
#5  0x000000000046d09d in ap_process_http_connection (c=0x1a980208) at
http_core.c:199
        r = (request_rec *) 0x1a99c0c0
        csd = (apr_socket_t *) 0x0
#6  0x000000000043fb22 in ap_run_process_connection (c=0x1a980208) at
connection.c:43
        n = 0
        rv = 0
#7  0x000000000048b094 in worker_thread (thd=0x1a7066f0, dummy=<value optimized
out>) at worker.c:544
        process_slot = 8
        thread_slot = 1
        csd = (apr_socket_t *) 0x1a97fff0
        bucket_alloc = (apr_bucket_alloc_t *) 0x1a981f78
        last_ptrans = <value optimized out>
        ptrans = (apr_pool_t *) 0x1a97ff68
        rv = <value optimized out>
        is_idle = <value optimized out>
#8  0x0000003ac08064a7 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#9  0x0000003ac00d3c2d in clone () from /lib64/libc.so.6
No symbol table info available.

2011/3/9 Igor GaliÄ <i.galic@xxxxxxxxxxxxxx>

----- Original Message -----
> Hi,

I achal,

> I have created a bug 50834. I am load testing apache 2.2.15 with
> mod_proxy and two upstream content servers. If I shut down a content
> server then apache core dumps. I think the issue is related to the
> changes made in rev 916627 (cleanup changes)

Thanks you for the report.

> Anyone else facing this issue?

Nope.. haven't heard of such behaviour yet.
Have you tried reverting the changes in r916627 and see if this issue
goes away?


> Achal

i

--
Igor GaliÄ

Tel: +43 (0) 664 886 22 883
Mail: i.galic@xxxxxxxxxxxxxx
URL: http://brainsware.org/

--
Achal Kumar

For blogging on cricket:-
http://funcricket.blogspot.com/

-- 
Achal Kumar

For blogging on cricket:-
http://funcricket.blogspot.com/