Hello, I am using Apache 2.2.9 and mod_gnutls.so (GNUTLS version 1_4) and I have experienced high load values on my server (HTTP/HTTPS Reverse proxy running on Lenny).
Regularly a new apache2 process spawns on the `top` command and takes X% of the CPU, if there is a single bugged process X=100, if there are 2 X=50 etc... `w' command reported a load value of 27 this morning, after a restart of apache it went down to 0 again. After 2 hours the load is now at 2. I am not used to troubleshooting but I managed to get a backtrace with gdb, here is the output: #0 0xb7f78a0e in apr_bucket_free () from /usr/lib/libaprutil-1.so.0 #1 0x08078dac in ap_core_output_filter () #2 0xb75133d3 in mgs_transport_write () from /usr/lib/apache2/modules/mod_gnutls.so #3 0xb78b93f2 in _gnutls_io_write_buffered () from /usr/lib/libgnutls.so.26 #4 0xb78b9950 in _gnutls_io_write_flush () from /usr/lib/libgnutls.so.26 #5 0xb78b5dc0 in _gnutls_send_int () from /usr/lib/libgnutls.so.26 #6 0xb78b627b in gnutls_record_send () from /usr/lib/libgnutls.so.26 #7 0xb7513b09 in mgs_filter_output () from /usr/lib/apache2/modules/mod_gnutls.so #8 0x0806f10e in ap_content_length_filter () #9 0xb74e07fc in ?? () from /usr/lib/apache2/modules/mod_proxy_http.so #10 0x08407b98 in ?? () #11 0x084223a0 in ?? () #12 0x084223a0 in ?? () #13 0x00000001 in ?? () #14 0x00002000 in ?? () #15 0x00000000 in ?? () I sent a interrupt signal to the process and then ended up in a sort of fatal error function from gnu_tls (I cannot recall the name). Maybe some function in gnu_tls is looping forever, waiting for a right return value (that never come unfortunately). Here are some other debugging clues: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5269 www-data 20 0 15136 5516 2424 R 49.8 0.4 15:53.62 apache2 5314 www-data 20 0 15012 5296 2308 R 47.8 0.4 10:55.86 apache2 load average: 1.50, 1.80, 1.68 This output is redundant in apache error log: [Wed Oct 28 15:54:44 2009] [debug] proxy_util.c(1819): proxy: worker proxy:reverse already initialized [Wed Oct 28 15:54:44 2009] [debug] proxy_util.c(1913): proxy: initialized single connection worker 17 in child 5461 for (*) ===================================================================================== [Wed Oct 28 15:48:33 2009] [info] [client 62.36.240.2] (104)Connection reset by peer: core_output_filter: writing data to the network [Wed Oct 28 15:49:40 2009] [info] [client 193.203.96.2] (32)Broken pipe: core_output_filter: writing data to the network [Wed Oct 28 15:53:59 2009] [info] [client 193.203.96.2] (32)Broken pipe: core_output_filter: writing data to the network I may not be able to give you more information about this server, the load was high but there were no latency. Do you have an idea about this issue ? Thank you for your attention. Regards. _______________________________________________ Help-gnutls mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-gnutls
