From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id A6C0593623 for ; Mon, 20 Feb 2023 11:33:48 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 88A1625914 for ; Mon, 20 Feb 2023 11:33:48 +0100 (CET) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS for ; Mon, 20 Feb 2023 11:33:44 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 3218047CB9 for ; Mon, 20 Feb 2023 11:33:44 +0100 (CET) Date: Mon, 20 Feb 2023 11:33:43 +0100 From: Wolfgang Bumiller To: Dominik Csapak Cc: pve-devel@lists.proxmox.com Message-ID: <20230220103343.h3qxh6xtj3etsao6@casey.proxmox.com> References: <20230220100828.3416873-1-d.csapak@proxmox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230220100828.3416873-1-d.csapak@proxmox.com> X-SPAM-LEVEL: Spam detection results: 0 AWL 0.185 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Subject: Re: [pve-devel] [RFC PATCH common] RESTEnvironment: better SIGCHLD handling in AnyEvent event loop 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: , X-List-Received-Date: Mon, 20 Feb 2023 10:33:48 -0000 On Mon, Feb 20, 2023 at 11:08:28AM +0100, Dominik Csapak wrote: > when we're in an API server that uses AnyEvent, we must postpone > the worker_reaper, since it calls 'active_workers' which might already > be called and then we're inside the lock twice (flocks are per process > for us, see PVE::Tools::lock_file) > > This resulted in an error like this: > close (rename) atomic file '/var/log/pve/tasks/active' failed: No such file or directory > > We use the fact that only 'pub' and 'priv' RESTEnvironment types are an > api server with anyevent. For other types we call it like before. > > Signed-off-by: Dominik Csapak > --- > Not super happy about the coupling between the RESTEnvironment and AnyEvent. > We could try to just save the worker_reaper in 'self' and let the users > of the env decide when to call it, but that would be more involved. > > OTOH, we already do some anyevent specific things in PVE::Daemon > (without depending on the AnyEvent package though)... > > Also i did not find a way to dynamically find out if we're in an > AnyEvent loop... The current SIGCHLD handling is a no-go either way, and I don't think an AnyEvent dependency is an issue. I mean, we may not be using it on the CLI, but I wouldn't be surprised if we needed to at some point either... I'm actually surprised it's not even used in the 'ha' environment types? > > debian/control | 1 + > src/PVE/RESTEnvironment.pm | 13 ++++++++++++- > 2 files changed, 13 insertions(+), 1 deletion(-) > > diff --git a/debian/control b/debian/control > index 232a0e4..1c75985 100644 > --- a/debian/control > +++ b/debian/control > @@ -3,6 +3,7 @@ Section: perl > Priority: optional > Maintainer: Proxmox Support Team > Build-Depends: debhelper (>= 12~), > + libanyevent-perl, > libclone-perl, > libdevel-cycle-perl, > libfilesys-df-perl, > diff --git a/src/PVE/RESTEnvironment.pm b/src/PVE/RESTEnvironment.pm > index bf89c12..c258b1e 100644 > --- a/src/PVE/RESTEnvironment.pm > +++ b/src/PVE/RESTEnvironment.pm > @@ -14,6 +14,7 @@ use IO::File; > use IO::Handle; > use IO::Select; > use POSIX qw(:sys_wait_h EINTR); > +use AnyEvent; > > use PVE::Exception qw(raise raise_perm_exc); > use PVE::INotify; > @@ -111,7 +112,17 @@ sub init { > die "unknown environment type" > if !$type || $type !~ m/^(cli|pub|priv|ha)$/; > > - $SIG{CHLD} = $worker_reaper; > + my $has_anyevent = $type eq 'pub' || $type eq 'priv'; > + > + $SIG{CHLD} = sub { > + # when we're in an api server, we have to postpone the call to worker_reaper, otherwise it > + # might interfere with running api calls > + if ($has_anyevent) { > + AnyEvent::postpone { $worker_reaper->() }; > + } else { > + $worker_reaper->(); > + } > + }; > > # environment types > # cli ... command started fron command line > -- > 2.30.2