Michal Trojnara Michal.Trojnara@mobi-com.net wrote on 31.05.2007 20:48:08:

On Monday 28 May 2007 20:51, Peter Heimann wrote:

...

Under heavy usage, stunnel-4.20 on AIX 5.3 enters into a loop with high CPU load. SSL_accept() returns with error, SSL_get_error() returns 5 (SSL_ERROR_SYSCALL). get_last_socket_error() returns EAGAIN, and the loop continues without end. Nevertheless, new connection requests still get processed.

Could it be the problem described at the end of this page: https://www.systinet.com/doc/ssc-65/waspc/html/extlibs.install.openssl.html

Indeed. Further experiments on AIX 5.3:

OpenSSL 0.9.8e configured as "./Configure no-idea threads", compiled with "cc" (IBM XL C Compiler 7.0), stunnel 4.20 --> loop in init_ssl()

OpenSSL 0.9.8e configured as "./Configure no-idea threads", compiled with "xlc_r" (IBM XL C Compiler 7.0, thread-safe variant), stunnel 4.20 --> no problem

OpenSSL 0.9.8e configured as "./Configure no-idea threads", compiled with "gcc" (GCC version 4.1.1), stunnel 4.20 --> no problem

Thanks for the hint.