From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [IPv6:2a01:7e0:0:424::9]) by lore.proxmox.com (Postfix) with ESMTPS id 60A281FF13E for ; Fri, 20 Feb 2026 10:36:23 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id C2B7C32A1; Fri, 20 Feb 2026 10:37:23 +0100 (CET) Message-ID: <7bbce03b-d8d6-4459-876c-2a71257959a4@proxmox.com> Date: Fri, 20 Feb 2026 10:36:49 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH qemu-server v2] fix #7119: qm cleanup: wait for process exiting for up to 30 seconds To: Fiona Ebner , =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= , pve-devel@lists.proxmox.com References: <20260210111612.2017883-1-d.csapak@proxmox.com> <7ee8d206-36fd-4ade-893b-c7c2222a8883@proxmox.com> <1770985110.nme4v4xomn.astroid@yuna.none> <9d501c98-a85c-44d4-af0e-0301b203d691@proxmox.com> <1771231158.rte62d97r5.astroid@yuna.none> <38236a30-a249-4ebe-bf89-788d67f36bd1@proxmox.com> Content-Language: en-US From: Dominik Csapak In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Bm-Milter-Handled: 55990f41-d878-4baa-be0a-ee34c49e34d2 X-Bm-Transport-Timestamp: 1771580199079 X-SPAM-LEVEL: Spam detection results: 0 AWL 0.031 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. 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SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Message-ID-Hash: 2XFQK4EJ4Q2CON36BMBJIQM7TXDCT6KL X-Message-ID-Hash: 2XFQK4EJ4Q2CON36BMBJIQM7TXDCT6KL X-MailFrom: d.csapak@proxmox.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list List-Id: Proxmox VE development discussion List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On 2/19/26 2:27 PM, Fiona Ebner wrote: > Am 19.02.26 um 11:15 AM schrieb Dominik Csapak: >> On 2/16/26 10:15 AM, Fiona Ebner wrote: >>> Am 16.02.26 um 9:42 AM schrieb Fabian Grünbichler: >>>> On February 13, 2026 2:16 pm, Fiona Ebner wrote: >>>>> Am 13.02.26 um 1:20 PM schrieb Fabian Grünbichler: >>>>>> On February 13, 2026 1:14 pm, Fiona Ebner wrote: >>>>>>> Am 10.02.26 um 12:14 PM schrieb Dominik Csapak: [snip] >>> >>> I guess the actual need is to have more consistent behavior. >>> >> >> ok so i think we'd need to >> * create a cleanup flag for each vm when qmevent detects a vm shutting >> down (in /var/run/qemu-server/VMID.cleanup, possibly with timestamp) >> * removing that cleanup flag after cleanup (obviously) >> * on start, check for that flag and block for some timeout before >> starting (e.g. check the timestamp in the flag if it's longer than some >> time, start it regardless?) > > Sounds good to me. > > Unfortunately, something else: turns out that we kinda rely on qmeventd > not doing the cleanup for the optimization with keeping the volumes > active (i.e. $keepActive). And actually, the optimization applies > randomly depending on who wins the race. > > Output below with added log line > "doing cleanup for $vmid with keepActive=$keepActive" > in vm_stop_cleanup() to be able to see what happens. > > We try to use the optimization but qmeventd interferes: > >> Feb 19 14:09:43 pve9a1 vzdump[168878]: starting task UPID:pve9a1:000293AF:0017CFF8:69970B97:vzdump:102:root@pam: >> Feb 19 14:09:43 pve9a1 vzdump[168879]: INFO: starting new backup job: vzdump 102 --storage pbs --mode stop >> Feb 19 14:09:43 pve9a1 vzdump[168879]: INFO: Starting Backup of VM 102 (qemu) >> Feb 19 14:09:44 pve9a1 qm[168960]: shutdown VM 102: UPID:pve9a1:00029400:0017D035:69970B98:qmshutdown:102:root@pam: >> Feb 19 14:09:44 pve9a1 qm[168959]: starting task UPID:pve9a1:00029400:0017D035:69970B98:qmshutdown:102:root@pam: >> Feb 19 14:09:47 pve9a1 qm[168960]: VM 102 qga command failed - VM 102 qga command 'guest-ping' failed - got timeout >> Feb 19 14:09:50 pve9a1 qmeventd[166736]: read: Connection reset by peer >> Feb 19 14:09:50 pve9a1 pvedaemon[166884]: end task UPID:pve9a1:000290CD:0017B515:69970B52:vncproxy:102:root@pam: OK >> Feb 19 14:09:50 pve9a1 systemd[1]: 102.scope: Deactivated successfully. >> Feb 19 14:09:50 pve9a1 systemd[1]: 102.scope: Consumed 41.780s CPU time, 1.9G memory peak. >> Feb 19 14:09:51 pve9a1 qm[168960]: doing cleanup for 102 with keepActive=1 >> Feb 19 14:09:51 pve9a1 qm[168959]: end task UPID:pve9a1:00029400:0017D035:69970B98:qmshutdown:102:root@pam: OK >> Feb 19 14:09:51 pve9a1 qmeventd[168986]: Starting cleanup for 102 >> Feb 19 14:09:51 pve9a1 qm[168986]: doing cleanup for 102 with keepActive=0 >> Feb 19 14:09:51 pve9a1 qmeventd[168986]: Finished cleanup for 102 >> Feb 19 14:09:51 pve9a1 systemd[1]: Started 102.scope. >> Feb 19 14:09:51 pve9a1 vzdump[168879]: VM 102 started with PID 169021. > > We manage to get the optimization: > >> Feb 19 14:16:01 pve9a1 qm[174585]: shutdown VM 102: UPID:pve9a1:0002A9F9:0018636B:69970D11:qmshutdown:102:root@pam: >> Feb 19 14:16:04 pve9a1 qm[174585]: VM 102 qga command failed - VM 102 qga command 'guest-ping' failed - got timeout >> Feb 19 14:16:07 pve9a1 qmeventd[166736]: read: Connection reset by peer >> Feb 19 14:16:07 pve9a1 systemd[1]: 102.scope: Deactivated successfully. >> Feb 19 14:16:07 pve9a1 systemd[1]: 102.scope: Consumed 46.363s CPU time, 2G memory peak. >> Feb 19 14:16:08 pve9a1 qm[174585]: doing cleanup for 102 with keepActive=1 >> Feb 19 14:16:08 pve9a1 qm[174582]: end task UPID:pve9a1:0002A9F9:0018636B:69970D11:qmshutdown:102:root@pam: OK >> Feb 19 14:16:08 pve9a1 systemd[1]: Started 102.scope. >> Feb 19 14:16:08 pve9a1 qmeventd[174685]: Starting cleanup for 102 >> Feb 19 14:16:08 pve9a1 qmeventd[174685]: trying to acquire lock... >> Feb 19 14:16:08 pve9a1 vzdump[174326]: VM 102 started with PID 174718. >> Feb 19 14:16:08 pve9a1 qmeventd[174685]: OK >> Feb 19 14:16:08 pve9a1 qmeventd[174685]: vm still running > > For regular shutdown, we'll also do the cleanup twice. > > Maybe we also need a way to tell qmeventd that we already did the cleanup? ok well then i'd try to do something like this: in 'vm_stop' we'll create a cleanup flag with timestamp + state (e.g. 'queued') in vm_stop_cleanup we change/create the flag with 'started' and clear the flag after cleanup (if it's here already in 'started' state within a timelimit, ignore it) in vm_start we block until the cleanup flag is gone or until some timeout in 'qm cleanup' we only start it if the flag does not exist I think this should make the behavior consistent?