From nobody Mon Nov 22 16:48:51 2021 X-Original-To: freebsd-current@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 B0256189177D for ; Mon, 22 Nov 2021 16:48:53 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from smtp.freebsd.org (smtp.freebsd.org [96.47.72.83]) (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 (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HyYBY3HWkz3r8J; Mon, 22 Nov 2021 16:48:53 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from [IPV6:2601:648:8601:8b20:7de4:e77a:791:6f5] (unknown [IPv6:2601:648:8601:8b20:7de4:e77a:791:6f5]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) (Authenticated sender: jhb) by smtp.freebsd.org (Postfix) with ESMTPSA id 859859161; Mon, 22 Nov 2021 16:48:52 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Message-ID: Date: Mon, 22 Nov 2021 08:48:51 -0800 List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: "Khelp module "ertt" can't unload until its refcount drops from 1 to 0." after "All buffers synced."? Content-Language: en-US To: tuexen@freebsd.org, Mark Millard Cc: freebsd-current References: <119DC979-EC2C-4BE4-A6E8-2DBF222115A0.ref@yahoo.com> <119DC979-EC2C-4BE4-A6E8-2DBF222115A0@yahoo.com> <52374B7E-6ABB-4E55-984C-B7EC82B48506@freebsd.org> <3A646420-0FB9-4C58-BA97-EE1040958B6E@freebsd.org> From: John Baldwin In-Reply-To: <3A646420-0FB9-4C58-BA97-EE1040958B6E@freebsd.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam: Yes X-ThisMailContainsUnwantedMimeParts: N On 11/19/21 4:29 AM, tuexen@freebsd.org wrote: >> On 19. Nov 2021, at 00:11, Mark Millard wrote: >> >>> On 2021-Nov-18, at 12:31, tuexen@freebsd.org wrote: >>> >>>> On 17. Nov 2021, at 21:13, Mark Millard via freebsd-current wrote: >>>> >>>> I've not noticed the ertt message before in: >>>> >>>> . . . >>>> Waiting (max 60 seconds) for system thread `bufspacedaemon-1' to stop... done >>>> All buffers synced. >>>> Uptime: 1d9h57m18s >>>> Khelp module "ertt" can't unload until its refcount drops from 1 to 0. >>> Hi Mark, >>> >>> what kernel configuration are you using? What kernel modules are loaded? >> >> The shutdown was of my ZFS boot media but the machine is >> currently doing builds on the UFS media. (The ZFS media is >> present but not mounted). For now I provide information >> from the booted UFS system. The UFS context is intended >> to be nearly a copy of the brctl selection for main [so: 14] >> from the ZFS media. Both systems have been doing the same >> poudriere builds for various comparison/contrast purposes. >> The current build activity will likely take 16+ hrs. > Hi Mark, > > thanks a lot for the information. I was contemplating whether this message > was related to a recent change in the TCP congestion module handling, but > since it was already there in February, this is not the case. Will try to > reproduce this, but wasn't able up to now. The congestion control changes just probably exacerbated the bug by adding a new reference on this module, just as they exposed the bug with khelp using the wrong SYSINIT subsystem. -- John Baldwin