Package: socat Version: 1.7.3.0-1 Severity: normal Tags: patch Dear Maintainer,
With socat version 1.7.3.0-1 when you run a command with unknown hostname, eg: socat tcp:server-local:789 - and the "server-local" is not defined in /etc/hosts, the system hits 100% cpu usage. Additionally, to terminate the socat process, `kill -9` needs to be used. With older versions of upstream socat (< 1.7.3.0) the system does not drive up to 100% cpu usage. Running the above command in jessie with an unknown hostname of "server-local" the result was: socat[2756] E getaddrinfo("server-local", "(null)", {1,0,1,6}, {}): Name of service not known I emailed the upstream socat maintainer about the issue and I got the attached patch, which he says will include in later socat versions. I think it should be applied to affected debian releases until it's published though. Regards, Lefteris -- System Information: Debian Release: stretch/sid APT prefers testing APT policy: (500, 'testing') Architecture: i386 (i686) Kernel: Linux 4.2.0-1-586 Locale: LANG=el_GR.UTF-8, LC_CTYPE=el_GR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages socat depends on: ii libc6 2.19-22 ii libssl1.0.0 1.0.2d-1 ii libwrap0 7.6.q-25 socat recommends no packages. socat suggests no packages. -- no debconf information
diff -Naur socat-1.7.3.0.orig/xio-ip.c socat-1.7.3.0/xio-ip.c --- xio-ip.c.orig 2015-01-24 12:15:22.000000000 +0200 +++ xio-ip.c 2015-10-29 12:57:43.550854706 +0200 @@ -239,7 +239,7 @@ if ((error_num = Getaddrinfo(node, service, &hints, &res)) != 0) { Error7("getaddrinfo(\"%s\", \"%s\", {%d,%d,%d,%d}, {}): %s", - node, service, hints.ai_flags, hints.ai_family, + node, service?service:"NULL", hints.ai_flags, hints.ai_family, hints.ai_socktype, hints.ai_protocol, (error_num == EAI_SYSTEM)? strerror(errno):gai_strerror(error_num));