问题：

图片不显示，nginx报错如下：

[error] 28585#0: *5120 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 124.127.211.125, server: www.54xiake.cn, request: “GET /admin/index.php?act=captcha&2027168701 HTTP/1.1”, upstream: “fastcgi://127.0.0.1:9000”, host: “www.54xiake.cn”

查看

Nov 02 23:50:15.324126 [WARNING] fpm_stdio_child_said(), line 167: child 10866 (pool default) said into stderr: “libpng warning: Application was compiled with png.h from libpng-1.5.12”
Nov 02 23:50:15.324325 [WARNING] fpm_stdio_child_said(), line 167: child 10866 (pool default) said into stderr: “”
Nov 02 23:50:15.324411 [WARNING] fpm_stdio_child_said(), line 167: child 10866 (pool default) said into stderr: “libpng warning: Application is running with png.c from libpng-1.2.49”
Nov 02 23:50:15.324490 [WARNING] fpm_stdio_child_said(), line 167: child 10866 (pool default) said into stderr: “”
Nov 02 23:50:15.324582 [WARNING] fpm_stdio_child_said(), line 167: child 10866 (pool default) said into stderr: “gd-png: fatal libpng error: Incompatible libpng version in application and library”
Nov 02 23:50:16.061598 [NOTICE] fpm_got_signal(), line 48: received SIGCHLD
Nov 02 23:50:16.061754 [WARNING] fpm_children_bury(), line 215: child 10866 (pool default) exited on signal 11 SIGSEGV (core dumped) after 113.343143 seconds from start
Nov 02 23:50:16.062287 [NOTICE] fpm_children_make(), line 352: child 11306 (pool default) started

解决：

rpm -e –nodeps libpng-devel-1.2.49-1.el6_2.x86_64

rpm -e –nodeps libpng-1.2.49-1.el6_2.x86_64