[peruser] segfaults with patch v7 on freebsd 7/amd64

Dave Steinberg dave-peruser at redterror.net
Thu Jan 6 10:01:50 MST 2011

Hello list, I'm getting signal 11 messages in my error log, and I've 
managed to get core dumps from my httpd proc.  Here's a snippit of what 
I'm seeing in gdb:

(gdb) bt
#0  apr_palloc (pool=0x80f712028, in_size=Variable "in_size" is not 
) at memory/unix/apr_pools.c:252
#1  0x000000080102ba60 in apr_pstrcat (a=Variable "a" is not available.
) at strings/apr_strings.c:149
#2  0x000000000044902c in pass_request (r=0x80f7120a0, 
child=0x8005a8598) at peruser.c:1510
#3  0x00000000004494a9 in peruser_post_read (r=0x80f7120a0) at 
#4  0x000000000042916a in ap_run_post_read_request (r=0x80f7120a0) at 
#5  0x000000000042b4ce in ap_read_request (conn=0x80f706298) at 
#6  0x00000000004407d3 in ap_process_http_connection (c=0x80f706298) at 
#7  0x000000000043d0d2 in ap_run_process_connection (c=0x80f706298) at 
#8  0x000000000044a174 in process_socket (p=0x80f706028, 
sock=0x80f7060a0, conn_id=16, bucket_alloc=0x80f710028, pool=0x80f704028)
     at peruser.c:1364
#9  0x000000000044b32b in child_main (child_num_arg=Variable 
"child_num_arg" is not available.
) at peruser.c:2211
#10 0x000000000044bae5 in make_child (s=0x801617868, slot=16) at 
#11 0x000000000044c481 in ap_mpm_run (_pconf=Variable "_pconf" is not 
) at peruser.c:2888
#12 0x0000000000423afa in main (argc=3, argv=0x7fffffffeab8) at main.c:739

I'm not sure if this is sufficient to help debug the problem, and I can 
provide the full gdb session if desired.  Apache is running here with 
mod_php, mod_perl, and mod_jk ... just to make things extra fun.

Is there more info I can provide that would be helpful?

In terms of reproducing this, it seems to happen fairly consistently on 
a few child procs when I do an 'apachectl graceful', but beyond that it 
isn't clear what triggers it.

I'll try to collect more core files and see if they all share a common 

PS - Before switching to mpm-peruser, I almost never saw any sig11's.

Thanks for your time,
Dave Steinberg

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