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From Jeff Trawick <traw...@attglobal.net>
Subject pool problems with HEAD??
Date Thu, 10 Jan 2002 16:28:47 GMT
CVS HEAD, Solaris, worker MPM, one process with many threads

<IfModule worker.c>
ServerLimit         1
ThreadLimit         500
StartServers         1
MaxClients         500
MinSpareThreads     25
MaxSpareThreads     75
ThreadsPerChild     500
MaxRequestsPerChild  0
</IfModule>

I had a client with many concurrent connections continually doing the
same request over and over.

After starting another client to get another 200 or so concurrent
connections, I quickly got a segfault in mod_log_config because
supposedly apr_palloc returned some bogus addresses (0 and 0x38).

#0  0x3fd84 in config_log_transaction (r=Cannot access memory at
 address 0xed5018f4
) at mod_log_config.c:823
823             strs[i] = process_item(r, orig, &items[i]);
(gdb) p strs
$1 = (char **) 0x0
(gdb) p format->nelts
$2 = 14
(gdb) p strl
$4 = (int *) 0x38
(gdb) p i
$5 = 0
(gdb)
(gdb) where
#0  0x3fd84 in config_log_transaction (r=0x6a62c8, cls=0x1add38,
 default_format=0x15cde8)
    at mod_log_config.c:823
#1  0x3ffd4 in multi_log_transaction (r=0x6a2618) at
 mod_log_config.c:881
#2  0xc3f98 in ap_run_log_transaction (r=0x6a2618) at protocol.c:1297
#3  0x53228 in ap_process_request (r=0x6a2618) at http_request.c:315
#4  0x4b150 in ap_process_http_connection (c=0x6a0758) at
 http_core.c:280
#5  0xba72c in ap_run_process_connection (c=0x6a0758) at
 connection.c:84
#6  0xbace4 in ap_process_connection (c=0x6a0758) at connection.c:230
#7  0xa08bc in process_socket (p=0x6a0638, sock=0x6a0670,
 my_child_num=0, my_thread_num=187)
    at worker.c:562
#8  0xa11f4 in worker_thread (thd=0x2bef88, dummy=0x1163b0) at
 worker.c:777
#9  0xff340990 in ?? ()

The funkiness about r changing in the traceback is (I suspect) because
in multi_log_transaction we walked through a list of r's using the
parameter as the variable.  Both r's look healthy.

Running a level of code from about a day before 2.0.30 on AIX this
morning, running about the same worker MPM config, I got a segfault
down in apr_palloc() because some heap structures were messed up.

Has anybody pounded on an Apache configured like that (one process,
many threads)?

-- 
Jeff Trawick | trawick@attglobal.net | PGP public key at web site:
       http://www.geocities.com/SiliconValley/Park/9289/
             Born in Roswell... married an alien...

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