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Mon, 17 Jan 2022 08:49:02 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:52584) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1n9SNZ-0004ym-Mk for bug-guix@gnu.org; Mon, 17 Jan 2022 08:49:01 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1n9SNZ-0005sO-MV for bug-guix@gnu.org; Mon, 17 Jan 2022 08:49:01 -0500 X-Loop: help-debbugs@gnu.org Subject: bug#53225: shepherd freezes if wireguard is started with dns config enabled Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Mon, 17 Jan 2022 13:49:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 53225 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: Nathan Dehnel Received: via spool by 53225-submit@debbugs.gnu.org id=B53225.164242733222570 (code B ref 53225); Mon, 17 Jan 2022 13:49:01 +0000 Received: (at 53225) by debbugs.gnu.org; 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dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: A2BB24B684 X-Spam-Score: -4.12 X-Migadu-Scanner: scn0.migadu.com X-TUID: cYQZg/NN5VUB Hi, Nathan Dehnel skribis: >>What do you mean by =E2=80=9Cfreezing=E2=80=9D? Does =E2=80=98herd statu= s=E2=80=99 and similar commands > block forever? > Yes > >>Requests in the Shepherd are currently handled sequentially. So if you > issue several =E2=80=98herd restart=E2=80=99 commands, they=E2=80=99ll be= processed one at a > time. This is usually okay because =E2=80=98start=E2=80=99 commands are = expected to be > quick (just wait for the daemon to write its PID file or similar). > What is the nature of this serialization? Does wireguard need to > finish before resolvconf can start? Because that's probably the issue. One command sent to shepherd by =E2=80=98herd =E2=80=A6=E2=80=99 must have = completed before the next one is processed. You can experience it like this: sudo herd eval root '(sleep 3)' & echo status && sudo herd status Here the first =E2=80=98herd=E2=80=99 command has shepherd block for 3 seco= nds, so the second =E2=80=98herd=E2=80=99 command won=E2=80=99t print anything until 3 = seconds have passed. HTH, Ludo=E2=80=99.