On Sun, Aug 26, 2018 at 8:37 PM Andrew Lunn <andrew at lunn.ch> wrote: > On Sun, Aug 26, 2018 at 08:23:24PM -0500, Jon Schewe wrote: > > I run a caching DNS server locally and it also serves up the domain for > my > > house. Since I upgrade from Ubuntu 16.04 to Ubuntu 18.04 I started > seeing a > > number of errors from named like this: > > > > 26-Aug-2018 08:05:21.536 general: error: > > ../../../../lib/isc/unix/socket.c:2135: unexpected error: > > 26-Aug-2018 08:05:21.537 general: error: internal_send: > > 192.168.42.11#44893: Invalid argument > > > > I have done some Google searching and haven't found a way to track down > > what these errors are about. The hosts giving the errors vary. I've > turned > > on some more logging and gotten a little more information, but nothing > that > > I know how to act on yet. > > Hi Jon > > You might get more information using strace. You can attach to a > running process using -p <PID>. > > I left strace running all day and then looked in the file for "Invalid argument". I found this: 920 sendmsg(515, {msg_name={sa_family=AF_INET, sin_port=htons(35329), sin_addr=inet_addr("192.168.42.11")}, msg_namelen=16, msg_iov=[{iov_base="r\337\201\200\0\1\0\2\0\0\0\1\10clients6\6google\3com"..., iov_len=88}], msg_iovlen=1, msg_control=[{cmsg_len=17, cmsg_level=SOL_IP, cmsg_type=IP_TOS, cmsg_data=[0]}], msg_controllen=24, msg_flags=0}, 0) = -1 EINVAL (Invalid argument) 921 sendmsg(515, {msg_name={sa_family=AF_INET, sin_port=htons(53639), sin_addr=inet_addr("192.168.42.11")}, msg_namelen=16, msg_iov=[{iov_base="\2l\201\200\0\1\0\2\0\0\0\1\10clients6\6google\3com"..., iov_len=88}], msg_iovlen=1, msg_control=[{cmsg_len=17, cmsg_level=SOL_IP, cmsg_type=IP_TOS, cmsg_data=[0]}], msg_controllen=24, msg_flags=0}, 0) = 88 -- http://mtu.net/~jpschewe -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.mn-linux.org/pipermail/tclug-list/attachments/20180830/8e57ba9b/attachment.html>