From nobody Thu Oct 7 15:36:22 2021 X-Original-To: freebsd-arm@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id BFF0917EDD9E for ; Thu, 7 Oct 2021 15:36:30 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (www.zefox.net [50.1.20.27]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "www.zefox.com", Issuer "www.zefox.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HQFmF42dpz3l0B for ; Thu, 7 Oct 2021 15:36:29 +0000 (UTC) (envelope-from fbsd@www.zefox.net) Received: from www.zefox.net (localhost [127.0.0.1]) by www.zefox.net (8.16.1/8.15.2) with ESMTPS id 197FaNk5084511 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Thu, 7 Oct 2021 08:36:23 -0700 (PDT) (envelope-from fbsd@www.zefox.net) Received: (from fbsd@localhost) by www.zefox.net (8.16.1/8.15.2/Submit) id 197FaMFm084510; Thu, 7 Oct 2021 08:36:22 -0700 (PDT) (envelope-from fbsd) Date: Thu, 7 Oct 2021 08:36:22 -0700 From: bob prohaska To: freebsd-arm@freebsd.org Cc: bob prohaska Subject: SSH disconnections Message-ID: <20211007153622.GA84489@www.zefox.net> List-Id: Porting FreeBSD to ARM processors List-Archive: https://lists.freebsd.org/archives/freebsd-arm List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-arm@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Queue-Id: 4HQFmF42dpz3l0B X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of fbsd@www.zefox.net has no SPF policy when checking 50.1.20.27) smtp.mailfrom=fbsd@www.zefox.net X-Spamd-Result: default: False [-0.59 / 15.00]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; WWW_DOT_DOMAIN(0.50)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_MEDIUM(-0.57)[-0.566]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[zefox.net]; AUTH_NA(1.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.92)[-0.922]; RCPT_COUNT_TWO(0.00)[2]; R_SPF_NA(0.00)[no SPF record]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:7065, ipnet:50.1.16.0/20, country:US]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_WWW(0.50)[] X-ThisMailContainsUnwantedMimeParts: N Lately certain ssh connections have been dropping on a Pi4 running -current as of yesterday. The odd thing is that out of several active ssh connections with that host, only one, running a cu session, is failing. The termination message is login: packet_write_wait: Connection to 192.168.1.11 port 22: Broken pipe /var/log/aculog contains lines similar to bob (Wed Oct 6 23:39:41 2021) call completed but the timestamp predates, at least sometimes, the actual disconnection. The host originating the connection is also a Pi4, running RasPiOS that's up-to-date as of a few days ago. There are numerous other active ssh connections to Pi2's and Pi3's, all of which remain connected and running for days, sometimes weeks. It looks as if the combination of cu and ssh is required to provoke the problem, any suggestions on where to look appreciated! Thanks for reading, bob prohaska