Date: Wed, 30 Dec 2020 08:08:50 -0800 From: David Wolfskill <david@catwhisker.org> To: "Hartmann, O." <o.hartmann@walstatt.org> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: # Fssh_packet_write_wait: Connection to 77.183.250.3 port 22: Broken pipe Message-ID: <X%2BymEk6xlrgyaui1@albert.catwhisker.org> In-Reply-To: <20201230080403.5474da7c@hermann.fritz.box> References: <20201230080403.5474da7c@hermann.fritz.box>
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--i7MDvwBGNnSXWh8r Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Dec 30, 2020 at 08:04:03AM +0100, Hartmann, O. wrote: > ... >=20 > # Fssh_packet_write_wait: Connection to XXX.XXX.XXX.XXX port 22: Broken p= ipe >=20 > The backend is in most cases a CURRENT, 12.1-RELENG or 12.2-RELENG or 12-= STABLE server. A > couple of months ago we moved from 11.3-RELENG to 12.1-RELENG (server sid= e, clients were > always 13-CURRENT or 12-STABLE). With FreeBSD 11 as the backend, those br= oken pipes > occured, but not that frequent and rapid as it is the fact now.=20 >=20 > The "problem" can be mitigated somehow: running top or using the console = prevents the > broken pipe fault for a while, but it still occurs. Running "screen" (port > sysutils/screen) does extend the usability of the console for a significa= nt timespan, but > the broken pipe also occurs randomly, but it takes a significant time to = occur. I have seen messages like that -- from a remote host that has rebooted or to which the network connection has (otherwise) been severed. A couple of things that I do may have (significantly) reduced the probability that I would encounter what you report under other conditions. Context: I work from my laptop, and ssh to ... well, just about everything: machines in my house; machines at work; machines at work accessible only from within the VPN hrough a bastion host; machines in the FreeBSD.org cluster.... Usually concurrently. The laptop normally runs FreeBSD stable/12 (freshly built each morning), but it runs head while I build head on it and for the smoke-test after the build is complete. * A long time ago, I placed "ServerAliveInterval 150" in ~/.ssh/config. (I suspect that this was well before Nov 2014, which was the beginning of my tenure with my current employer. And yes, I had been using the above-described "ssh to everyhing" well before then -- I think I got in he habit around 1999, back at Whistle.) * Whenever I am about to do something "sensitive," I run tmux (port/package sysutils/tmux -- same "ecological niche" as screen, but I switched from screen to tmux several years ago, and haven't looked back.) This has become enough of a habit that I tend to run tmux from "muscle memory." Or I have set up csh aliasses or scripts to "do stuff" that automagically invoke tmux, so I don't even notice. * [Yeah, I wrote "a couple" up there; this is a bonus. :-) ] I don't keep machines up longer than about 175 hours (a little over a week) at a stretch: I update my laptop and my "build machine" daily, and update the other machines under my control weekly. > ....=20 Peace, david --=20 David H. Wolfskill david@catwhisker.org While Trump successfully conned a lot of people for a while, in the end he's just a failure throwing a temper tantrum because he lost. See https://www.catwhisker.org/~david/publickey.gpg for my public key. --i7MDvwBGNnSXWh8r Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGTBAEBCgB9FiEE4owz2QxMJyaxAefyQLJg+bY2PckFAl/sphJfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEUy OEMzM0Q5MEM0QzI3MjZCMTAxRTdGMjQwQjI2MEY5QjYzNjNEQzkACgkQQLJg+bY2 Pcke2Af/R2x7HE2gf2hslaU/lYnjT7RmUGHQOltndv2szEv1k6GKxvxPbt7xvXZL 6dDNDKa6nm0qJaUoGbs+u9n+sCxlzN4XMHi71PLi6jFBGbiyYxcPGzofqeVi2zpu 1lQ+66xyLThO6lmze169sesVS9jjFVMtu0InRQsyXu+JQ5V8hnpc46n5aUA3igyA rgjAKi9IKVWwtbIggoEXUS6V+HrMNaGzNG8kp1oNf0DGSNKYi7gu+OnY3rn/NRA9 RXY9c6gYOF2jdmK4TZeTZGP7m4LSxoU5baVH8o4goAEphb0OALVg86zHRdvh/ZTG 0oV+i35Y39bsSECkC84jPBQ2ZAAd8g== =fnwN -----END PGP SIGNATURE----- --i7MDvwBGNnSXWh8r--
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