From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) by lore.proxmox.com (Postfix) with ESMTPS id 63ABF1FF13F for ; Wed, 14 Jan 2026 17:18:38 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 49AB817955; Wed, 14 Jan 2026 17:18:39 +0100 (CET) Message-ID: <28786a3c-1da1-4e92-8697-5eca5278743b@proxmox.com> Date: Wed, 14 Jan 2026 17:18:04 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Proxmox VE development discussion , Fiona Ebner References: <20251006092428.756414-1-f.ebner@proxmox.com> Content-Language: en-US From: Friedrich Weber In-Reply-To: <20251006092428.756414-1-f.ebner@proxmox.com> X-Bm-Milter-Handled: 55990f41-d878-4baa-be0a-ee34c49e34d2 X-Bm-Transport-Timestamp: 1768407438659 X-SPAM-LEVEL: Spam detection results: 0 AWL 0.013 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment RCVD_IN_VALIDITY_CERTIFIED_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to Validity was blocked. See https://knowledge.validity.com/hc/en-us/articles/20961730681243 for more information. RCVD_IN_VALIDITY_RPBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to Validity was blocked. See https://knowledge.validity.com/hc/en-us/articles/20961730681243 for more information. RCVD_IN_VALIDITY_SAFE_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to Validity was blocked. See https://knowledge.validity.com/hc/en-us/articles/20961730681243 for more information. SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [proxmox.com] Subject: Re: [pve-devel] [PATCH kernel] cherry-pick fix for problematic CIFS/io_uring interaction X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Proxmox VE development discussion Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: pve-devel-bounces@lists.proxmox.com Sender: "pve-devel" On 06/10/2025 11:24, Fiona Ebner wrote: > When io_uring is used in the same task as CIFS, there might be > unnecessary reconnects, which QEMU will treat as an IO error. > > This has been a long-standing issue [0] and was partially mitigated by > qemu-server commit e31762f2 ("fix #4099: disable io_uring for virtual > disks on CIFS storages"). However, back then it was not clear that > it's enough to have IO via io_uring and IO via CIFS be present in the > same task, even if io_uring is not used for CIFS. The issue resurfaced > when QEMU blockdev mirroring was used with the source side using > io_uring and the target being CIFS. This was reported by Aaron > Lauterer and Friedrich Weber. It's also enough to have a VM with two > disks, one using io_uring and one using CIFS and doing IO on both, to > trigger the issue. > > Fix the issue by picking up the accepted fix from upstream, i.e. > kernel commit 00be6f26a2a7 ("smb: client: transport: avoid reconnects > triggered by pending task work"). > > [0]: https://bugzilla.proxmox.com/show_bug.cgi?id=4099 > > Signed-off-by: Fiona Ebner > --- I noticed the patch was backported to Ubuntu-6.17.0-14.14 as 0d83d11f144a, and is thus contained in our kernel >= 6.17.9-1. _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel