Package: libc6 Version: 2.24-3 Severity: normal Tags: upstream
While reconfiguring the /etc/resolv.conf, the integer parameter for "attempts" was removed. I'm not sure if I'd call this a bug in the documentation or in the library itself. It seems that what happens is that when the file contains something like "attmepts:" (note the missing parameter), the libresolv returns after zero attempts. $ cat /etc/resolv.conf # Generated by NetworkManager nameserver 192.168.200.1 nameserver fe80::a263:91ff:fe71:e007%wlp3s0 $ dig +short -t A www.yahoo.com fd-fp3.wg1.b.yahoo.com. 98.139.180.149 98.139.183.24 $ telnet -4 www.yahoo.com 80 Trying 98.139.180.149... Connected to fd-fp3.wg1.b.yahoo.com. Escape character is '^]'. ^] telnet> quit Connection closed. $ echo "options attempts:" >> /etc/resolv.conf $ cat /etc/resolv.conf # Generated by NetworkManager nameserver 192.168.200.1 nameserver fe80::a263:91ff:fe71:e007%wlp3s0 options attempts: $ dig +short -t A www.yahoo.com fd-fp3.wg1.b.yahoo.com. 98.139.183.24 98.139.180.149 $ telnet -4 www.yahoo.com 80 telnet: could not resolve www.yahoo.com/80: Name or service not known $ I marked this as upstream as I also tested this in CentOS, and the same issue exists there. Based on the documentation from "man 5 resolv.conf", this is unexpected behavior. The documentation states that the default is 2, while it is silently capped at 5. It makes no mention about what the absence of a parameter might do. -- System Information: Debian Release: stretch/sid APT prefers testing APT policy: (500, 'testing'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages libc6 depends on: ii libgcc1 1:6.1.1-11 libc6 recommends no packages. Versions of packages libc6 suggests: ii debconf [debconf-2.0] 1.5.59 pn glibc-doc <none> ii libc-l10n 2.24-3 ii locales 2.24-3 -- debconf information: glibc/kernel-not-supported: glibc/disable-screensaver: * libraries/restart-without-asking: false glibc/restart-failed: glibc/kernel-too-old: * glibc/restart-services: exim4 cron atd glibc/upgrade: true
