短版本，我从Fedora Server 23升级到Fedora Server 24，现在我的apache（httpd-2.4.23-4.fc24.x86_64）error_log正在填充这些消息：
[Mon Nov 28 20:30:39.486187 2016] [mpm_worker:crit] [pid 9973:tid 140499117635328] (22)Invalid argument: AH03139: ap_queue_pop failed [Mon Nov 28 20:30:39.486197 2016] [mpm_worker:crit] [pid 9973:tid 140499117635328] (22)Invalid argument: AH03139: ap_queue_pop failed （它引起了磁盘空间警报，并且当它达到1.8Gb时我修剪了error_log！）
我正在使用这些设置的MPM工作人员：
ServerLimit 60 MaxRequestWorkers 1500 MinSpareThreads 10 MaxSpareThreads 25 MaxRequestsPerChild 10000
ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 29966 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 4096 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 29966 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
任何意见，将不胜感激。 🙂
Apache Server Status for example.com (via xxxx) Server Version: Apache/2.4.23 (Fedora) OpenSSL/1.0.2j-fips PHP/5.6.28 Server MPM: worker Server Built: Jul 18 2016 15:38:14 Current Time: Wednesday, 30-Nov-2016 12:48:45 AST Restart Time: Tuesday, 29-Nov-2016 18:21:57 AST Parent Server Config. Generation: 3 Parent Server MPM Generation: 2 Server uptime: 18 hours 26 minutes 48 seconds Server load: 6.60 6.48 6.33 Total accesses: 2278650 - Total Traffic: 20.6 GB CPU Usage: u488.03 s82.94 cu4.36 cs14.77 - .889% CPU load 34.3 requests/sec - 325.3 kB/second - 9.5 kB/request 146 requests currently being processed, 79 idle workers _W_K_KKKCKKKKK_K__KKK___CKK_KKK__K_K___K___CKK_W_K_K__C_KK___K_K KKCK_CK__CKKWCK__WKKKKKKW_WWKKKKC_____K__K_KKKKKKKWK_K_KK__KK... ......................KKKKKKKK_K_KKC____KKKCKKKKK__KCKKKKC_KC__K _KKKK_CKK_KK__K_KKKK___RKCCK_K_KK_KC_K_KKK_K__W_K_KK__KKKK...... ................................................................ ................................................................ ................ Scoreboard Key: "_" Waiting for Connection, "S" Starting up, "R" Reading Request, "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup, "C" Closing connection, "L" Logging, "G" Gracefully finishing, "I" Idle cleanup of worker, "." Open slot with no current process
编辑：最后，我相信服务器是整体不稳定，报废，从头build立一个新的。 我从来没有能够解决这个问题。
看来您的系统限制不够高，导致Apache进程出现问题。 您可能想要增加max user processes ， pending signals和open files 。 这里有一些优选值：
core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 1546671 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 102400 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 1546671 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited