From nobody Fri Oct 24 10:36:19 2025 X-Original-To: dev-commits-src-all@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 4ctK8239hgz6F59y; Fri, 24 Oct 2025 10:36:34 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (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 did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4ctK8146z8z3j1L; Fri, 24 Oct 2025 10:36:33 +0000 (UTC) (envelope-from kostikbel@gmail.com) Authentication-Results: mx1.freebsd.org; none Received: from tom.home (kib@localhost [127.0.0.1] (may be forged)) by kib.kiev.ua (8.18.1/8.18.1) with ESMTP id 59OAaJxV060518; Fri, 24 Oct 2025 13:36:23 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 59OAaJxV060518 Received: (from kostik@localhost) by tom.home (8.18.1/8.18.1/Submit) id 59OAaJbK060517; Fri, 24 Oct 2025 13:36:19 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Fri, 24 Oct 2025 13:36:19 +0300 From: Konstantin Belousov To: Poul-Henning Kamp Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 2612f1b8649b - main - deadfs: Return ENXIO instead of EIO when the device is gone. Message-ID: References: <202510240741.59O7fBAe041995@gitrepo.freebsd.org> <202510241012.59OACUDA002781@critter.freebsd.dk> List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202510241012.59OACUDA002781@critter.freebsd.dk> X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on tom.home X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Queue-Id: 4ctK8146z8z3j1L On Fri, Oct 24, 2025 at 10:12:30AM +0000, Poul-Henning Kamp wrote: > -------- > Konstantin Belousov writes: > > > On Fri, Oct 24, 2025 at 07:41:11AM +0000, Poul-Henning Kamp wrote: > > > > Something changed recently, and while testing this fix, I noticed > > Nothing changed WRT code, it is just a race that causes the behavior. > > That is why I wrote "something", because I agree that it is not code > in our tree which has changed. > > > > that drm-kmod-66/i915kms may be the condition which trigger > > > the different code-path. > > It worries me if loading drm-kmod-66/i915kms can cause this kind > of change of behaviour. > > Even with the fix, I see 2-4 read(2) operations return EIO before > the ENXIO manifests. > > The only hypothesis I have, is that something in DRM-world hogs > some kind of HW resource, but I do not have time (nor drm-skillz) > to look into that this morning, and I wanted to get the ENXIO fix > in for RELENG-15 purposes[1]. I do not think that DRM really affects the code path for io. I see several EIOs in CAM, in particular scsi_da.c, but I do not know CAM/USB/umass stack to track that down by reading.