[rt-users] apache 100% cpu usage

Payam Poursaied me at payam124.com
Sun Mar 20 04:19:00 EDT 2011


Hi all
We are using rt3.8.8 and we  faced with a problem using apache 1.3.42 on FreeBSD 8.0-RELEASE.
The problem is that httpd processes frequently reach 100% CPU usage and stay
at this level of CPU usage. 
This is a sample of top output. 

  PID USERNAME   THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
77051 www          1 118    0   208M 86080K CPU4    4  87.6H 100.00% httpd
 9403 www          1 118    0   215M 93340K CPU2    2  65.0H 100.00% httpd
78430 www          1 118    0   226M   100M CPU0    0  58:57 100.00% httpd
95332 www          1  50    0   205M 83624K sbwait 12   0:02  4.49% httpd
89664 www          1  46    0   210M 88144K sbwait 11   0:05  2.59% httpd
95331 www          1  46    0   205M 83464K sbwait 12   0:01  1.66% httpd
46157 www          1  47    0   258M   134M sbwait 15   3:03  1.17% httpd
89493 www          1  44    0   212M 90152K accept 13   0:20  0.10% httpd
22801 www          1  44    0   264M   137M accept 13   5:40  0.00% httpd
25440 www          1  44    0   275M   145M accept 11   5:35  0.00% httpd
30396 www          1  44    0   262M   135M accept 14   4:47  0.00% httpd
82456 www          1  44    0   233M   109M accept 12   1:37  0.00% httpd
80407 www          1  44    0   239M   110M accept 10   0:49  0.00% httpd
80097 www          1  44    0   265M   135M accept  1   0:35  0.00% httpd
88622 www          1  46    0   216M 94588K accept 15   0:16  0.00% httpd
88968 www          1  44    0   208M 86316K accept  6   0:03  0.00% httpd
89686 www          1  44    0   201M 80216K accept 11   0:01  0.00% httpd
95330 www          1  44    0   201M 77088K sbwait 10   0:00  0.00% httpd

I think there might be a bug that caused something like endless loop but I
am newbie to gdb and debugging and I could not find any relevant point to
get into it.
I tried to compile apache in debug mode and then wait to see a suspicious
process and then attached GDB66 to that cpu intensive httpd process to find
out what is going on. 
But I could not go further more.

I have also consulted with apache-freebsd mailing list but there wasn't any success.

Could anyone help me to drill down this problem?

Best Regards
Payam Poursaied

Using "next" says:
(gdb) next
Cannot find bounds of current function
And here below is output of "where" command in gdb66.
(gdb) where
#0  0x000000080093a73b in ?? () from /lib/libc.so.7
#1  0x000000080093d505 in ?? () from /lib/libc.so.7
#2  0x00000008009401bc in ?? () from /lib/libc.so.7
#3  0x0000000800942ec4 in malloc () from /lib/libc.so.7
#4  0x0000000803079946 in Perl_safesysmalloc () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#5  0x000000080308cee0 in Perl_av_extend () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#6  0x000000080308dabe in Perl_av_store () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#7  0x000000080750de53 in retrieve_byte () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#8  0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#9  0x00000008075113b8 in retrieve_hash () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#10 0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#11 0x000000080750ce29 in retrieve_ref () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#12 0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#13 0x00000008075113b8 in retrieve_hash () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#14 0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#15 0x000000080751298c in retrieve_blessed () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#16 0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#17 0x000000080750ce29 in retrieve_ref () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#18 0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#19 0x00000008075113b8 in retrieve_hash () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#20 0x000000080750c66b in retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#21 0x000000080750d55f in do_retrieve () from /usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#22 0x000000080750dd28 in XS_Storable_mretrieve () from
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Storable/Storable.so
#23 0x0000000803090620 in Perl_pp_entersub () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#24 0x000000080308eb9e in Perl_runops_standard () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#25 0x00000008030c1ee3 in S_docatch () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#26 0x000000080308eb9e in Perl_runops_standard () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#27 0x0000000803035e57 in Perl_call_sv () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#28 0x00000008030d9b46 in Perl_pp_tie () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#29 0x000000080308eb9e in Perl_runops_standard () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#30 0x00000008030c1ee3 in S_docatch () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#31 0x00000008030c343c in Perl_pp_entereval () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#32 0x000000080308eb9e in Perl_runops_standard () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#33 0x0000000803035e57 in Perl_call_sv () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#34 0x00000008030d9b46 in Perl_pp_tie () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#35 0x000000080308eb9e in Perl_runops_standard () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#36 0x0000000803036191 in Perl_call_sv () from /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
#37 0x0000000802eabe36 in perl_call_handler () from /usr/local/libexec/apache/libperl.so
#38 0x0000000802eac87a in perl_run_stacked_handlers () from /usr/local/libexec/apache/libperl.so
#39 0x0000000802eae2b0 in perl_handler () from /usr/local/libexec/apache/libperl.so
#40 0x000000000040ee42 in ap_invoke_handler (r=0x8045c9060) at http_config.c:476
#41 0x0000000000427849 in process_request_internal (r=0x8045c9060) at http_request.c:1299
#42 0x00000000004278a4 in ap_process_request (r=0x8045c9060) at http_request.c:1315
#43 0x000000000041d423 in child_main (child_num_arg=17) at http_main.c:4885
#44 0x000000000041d734 in make_child (s=0x800c05060, slot=17, now=1299387327) at http_main.c:5055
#45 0x000000000041db6b in perform_idle_server_maintenance () at http_main.c:5256
#46 0x000000000041e159 in standalone_main (argc=1, argv=0x7fffffffed70) at http_main.c:5520
#47 0x000000000041e7a4 in main (argc=1, argv=0x7fffffffed70) at http_main.c:5773


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