Date: Thu, 13 Jul 2023 20:14:19 -0700 From: Doug Hardie <bc979@lafn.org> To: questions@freebsd.org Subject: Random sshd hangs Message-ID: <30FBD752-56E4-4A18-8EB9-54E9F4D0EF98@sermon-archive.info>
next in thread | raw e-mail | index | archive | help
--Apple-Mail=_E4B1C057-BA57-498A-8CF0-EED71691F6B1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii I have a FreeBSD 13.2 system that I use for software development. I = have been working on a project that uses libgd to create charts. Since = libgd is so completely documented, I have to try lots of different = things to find the one that will work. occasionally, during this = development, ssh would hang right after running my program. All = existing ssh sessions lock up and eventually time out and disconnect. = However, new ssh sessions can be established and there appears to be = nothing unusual with the system. Top shows everything is quiet. My = first thought was that my code was dumping core, but there are no core = files and there is no notice about a core dump in messages. During this = time, web access is also unavailable although the web server is running = and showing no arriving connections. After somewhere around 5-10 minutes, everything returns to normal. This = is not consistent. I can run the program 10 time fine before the next = hang. There is nothing I have found that is common to the hangs. Now = that I have the program running correctly, the system never seems to = hang again. All my ideas on what is causing this are not supported by = the facts. It's not a core dump issue. It does not appear to be an IP = issue as IP continues to work, as do new ssh connections. The web = server is sitting there completely idle. It never receives any = requests. I suppose it could be something in libgd, but it would seem = that would be continuing even now. I am a lot confused over this. I = don't want to upgrade my production servers as Those hangs would be = killers to my clients. Any ideas what this might be, or what to = investigate if it happens again? -- Doug --Apple-Mail=_E4B1C057-BA57-498A-8CF0-EED71691F6B1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii <html><head><meta http-equiv=3D"content-type" content=3D"text/html; = charset=3Dus-ascii"></head><body style=3D"overflow-wrap: break-word; = -webkit-nbsp-mode: space; line-break: after-white-space;">I have a = FreeBSD 13.2 system that I use for software development. I have = been working on a project that uses libgd to create charts. Since = libgd is so completely documented, I have to try lots of different = things to find the one that will work. occasionally, during this = development, ssh would hang right after running my program. All = existing ssh sessions lock up and eventually time out and disconnect. = However, new ssh sessions can be established and there appears to = be nothing unusual with the system. Top shows everything is quiet. = My first thought was that my code was dumping core, but there are = no core files and there is no notice about a core dump in messages. = During this time, web access is also unavailable although the web = server is running and showing no arriving = connections.<div><br></div><div>After somewhere around 5-10 minutes, = everything returns to normal. This is not consistent. I can run = the program 10 time fine before the next hang. There is nothing I = have found that is common to the hangs. Now that I have the = program running correctly, the system never seems to hang again. = All my ideas on what is causing this are not supported by the = facts. It's not a core dump issue. It does not appear to be = an IP issue as IP continues to work, as do new ssh connections. = The web server is sitting there completely idle. It never = receives any requests. I suppose it could be something in libgd, = but it would seem that would be continuing even now. I am a lot = confused over this. I don't want to upgrade my production servers = as Those hangs would be killers to my clients. Any ideas what this = might be, or what to investigate if it happens = again?</div><div><br><div> <div>-- Doug</div> </div> <br></div></body></html>= --Apple-Mail=_E4B1C057-BA57-498A-8CF0-EED71691F6B1--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?30FBD752-56E4-4A18-8EB9-54E9F4D0EF98>