Hi, Recently I migrated the front-end of our bulletin board (running phpBB, patched against the recently highlight vulnerability) to a pair of servers running Fedora Core 3. I compiled Apache 1.3.33 and PHP 4.3.10 from source. This morning, the servers slowed down to the point that they were almost completely unresponsive. After a while I managed to SSH into the machines and saw that the httpd processes had grown to 35MB each and were using up all the swap and RAM on the machines (they have 1GB RAM, 1GB swap). I then set MaxClients to 30 and restarted Apache, but the slowdown happened again: top - 18:18:51 up 32 days, 4:51, 1 user, load average: 15.22, 41.62, 39.75 Tasks: 90 total, 1 running, 89 sleeping, 0 stopped, 0 zombie Cpu(s): 0.2% us, 0.0% sy, 0.0% ni, 99.7% id, 0.2% wa, 0.0% hi, 0.0% si Mem: 1033484k total, 898000k used, 135484k free, 1268k buffers Swap: 1052248k total, 896880k used, 155368k free, 10896k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 19305 nobody 16 0 41892 35m 5732 S 0.0 3.5 0:38.49 /www/bin/httpd 19219 nobody 18 0 41940 29m 5732 S 0.0 3.0 0:20.87 /www/bin/httpd 19290 nobody 18 0 41940 29m 5732 S 0.0 3.0 0:42.64 /www/bin/httpd 19217 nobody 18 0 48780 29m 5736 S 0.0 2.9 0:51.25 /www/bin/httpd 19252 nobody 16 0 41916 29m 5732 S 0.0 2.9 0:45.81 /www/bin/httpd 19298 nobody 18 0 41940 29m 5732 S 0.0 2.9 0:16.61 /www/bin/httpd 19296 nobody 18 0 44052 25m 5732 S 0.0 2.6 0:42.79 /www/bin/httpd 19294 nobody 18 0 41796 25m 5732 S 0.0 2.5 0:11.85 /www/bin/httpd 19215 nobody 17 0 41892 25m 5732 S 0.0 2.5 0:22.84 /www/bin/httpd 19218 nobody 17 0 41940 25m 5732 S 0.0 2.5 0:17.84 /www/bin/httpd 19221 nobody 16 0 41900 24m 5732 S 0.0 2.5 0:45.56 /www/bin/httpd 19299 nobody 17 0 41796 24m 5732 S 0.0 2.5 0:11.63 /www/bin/httpd 19302 nobody 17 0 41796 24m 5732 S 0.0 2.5 0:13.46 /www/bin/httpd 19220 nobody 16 0 42300 24m 5732 S 0.0 2.4 0:24.97 /www/bin/httpd 19292 nobody 16 0 41796 21m 5732 S 0.0 2.1 0:37.17 /www/bin/httpd 19303 nobody 16 0 43736 19m 5732 S 0.0 1.9 0:45.86 /www/bin/httpd 19300 nobody 18 0 42184 16m 5732 S 0.0 1.6 0:31.80 /www/bin/httpd 19222 nobody 18 0 42264 14m 5732 S 0.0 1.4 0:16.17 /www/bin/httpd 19291 nobody 16 0 41904 13m 5732 S 0.0 1.4 0:12.57 /www/bin/httpd 19293 nobody 16 0 41796 12m 5732 S 0.0 1.3 0:33.04 /www/bin/httpd 19295 nobody 18 0 44040 11m 5732 S 0.0 1.1 0:35.78 /www/bin/httpd 19224 nobody 17 0 42292 8600 5732 S 0.0 0.8 0:15.22 /www/bin/httpd 19304 nobody 16 0 43804 7908 5732 S 0.0 0.8 0:37.06 /www/bin/httpd 19301 nobody 16 0 43736 7316 5732 S 0.0 0.7 0:40.19 /www/bin/httpd 19537 nobody 18 0 21112 7020 5732 S 0.0 0.7 0:05.79 /www/bin/httpd 19250 nobody 16 0 42272 5712 5732 S 0.0 0.6 0:15.20 /www/bin/httpd 19223 nobody 16 0 41940 5248 5732 S 0.0 0.5 0:45.97 /www/bin/httpd 19216 nobody 16 0 41892 4828 5732 S 0.0 0.5 0:42.77 /www/bin/httpd 19287 nobody 18 0 41892 4312 5732 S 0.0 0.4 0:38.22 /www/bin/httpd 19288 nobody 18 0 41892 4096 5732 S 0.0 0.4 0:08.98 /www/bin/httpd I then checked the error log and found this: *** glibc detected *** double free or corruption: 0x097ec7e8 *** *** glibc detected *** double free or corruption: 0x097ec7e8 *** *** glibc detected *** double free or corruption: 0x097e6d58 *** *** glibc detected *** double free or corruption: 0x096ec7b8 *** *** glibc detected *** double free or corruption: 0x09723188 *** *** glibc detected *** double free or corruption: 0x097ed3b8 *** *** glibc detected *** double free or corruption: 0x097e8870 *** *** glibc detected *** double free or corruption: 0x097ffe88 *** *** glibc detected *** double free or corruption: 0x096ee320 *** *** glibc detected *** double free or corruption: 0x08f147e8 *** *** glibc detected *** double free or corruption: 0x08f147f8 *** *** glibc detected *** double free or corruption: 0x08f147f8 *** and the same on the other server: *** glibc detected *** double free or corruption: 0x09957ac0 *** *** glibc detected *** double free or corruption: 0x09a50710 *** *** glibc detected *** double free or corruption: 0x09a622e0 *** *** glibc detected *** double free or corruption: 0x09978768 *** *** glibc detected *** double free or corruption: 0x099df900 *** *** glibc detected *** double free or corruption: 0x0993ca08 *** *** glibc detected *** double free or corruption: 0x0992b6d8 *** *** glibc detected *** double free or corruption: 0x0992b6d8 *** *** glibc detected *** double free or corruption: 0x0992b5f8 *** This bulletin board application has been running fine for a month or so on a pair of Fedora Core 1 servers running PHP 4.3.9 (which I've recently upgraded to 4.3.10), and they didn't have the above problem. Any advice would be much appreciated. Regards, -- Alex
