From: "Ludovic Courtès" <ludo@gnu.org>
To: Jan Nieuwenhuizen <janneke@gnu.org>
Cc: 43650@debbugs.gnu.org
Subject: [bug#43650] [PATCH 4/8] services: hurd-vm: Check whether /dev/kvm exists at run time.
Date: Tue, 29 Sep 2020 12:10:50 +0200 [thread overview]
Message-ID: <87r1qk7v11.fsf@gnu.org> (raw)
In-Reply-To: <87h7rh4yyd.fsf@gnu.org> (Jan Nieuwenhuizen's message of "Mon, 28 Sep 2020 19:02:02 +0200")
Hi!
I’ve pushed ‘wip-childhurd’ with a few additional commits.
The flaky startup issue appears to be fixed by:
88946005d7 * services: secret-service: Add initial client/server handshake.
Before that, what would happen is that:
1. The host would connect(2) to QEMU as soon as QEMU is running;
connect(2) would succeed immediately and so the host would send its
secrets right away, disconnect, and move on.
However, at that point, the guest is still booting and its secret
service server is not even accept(2)ing yet. Looks like QEMU’s
SLIRP would more or less buffer the packets the host sent, “more or
less” being the important point.
2. The guest would eventually accept(2), which would succeed. Then it
would sometimes receive stuff, sometimes not, depending on what
happened with the SLIRP buffering I suppose.
The fix is to have the server in the guest send a “hello” message. The
client in the host waits for that message before sending its secrets.
Consequently, it can take ~20s for the ‘start’ method of the childhurd
to succeed. Eventually, when shepherd runs on Fibers or similar, it
won’t be a problem, but for now it means that PID 1 remains stuck in
select(2) for this many seconds.
Ludo’.
next prev parent reply other threads:[~2020-09-29 10:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-27 15:29 [bug#43650] [PATCH 0/8] Assorted childhurd improvements Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 1/8] services: hurd-vm: Run QEMU as an unprivileged user Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 2/8] services: childhurd: Tweak description Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 3/8] secret-service: Clarify the origin of messages Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 4/8] services: hurd-vm: Check whether /dev/kvm exists at run time Ludovic Courtès
2020-09-28 17:02 ` Jan Nieuwenhuizen
2020-09-29 10:10 ` Ludovic Courtès [this message]
2020-09-29 14:22 ` Jan Nieuwenhuizen
2020-09-29 20:13 ` bug#43650: " Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 5/8] services: guix: Generate key pair if needed during activation Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 6/8] services: hurd-vm: Initialize the guest's SSH/Guix keys at activation time Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 7/8] services: hurd-vm: Pass "-no-reboot" when spawning the Hurd VM Ludovic Courtès
2020-09-27 15:32 ` [bug#43650] [PATCH 8/8] secret-service: Add a timeout when waiting for a client Ludovic Courtès
2020-09-28 16:57 ` [bug#43650] [PATCH 1/8] services: hurd-vm: Run QEMU as an unprivileged user Jan Nieuwenhuizen
2020-09-28 22:19 ` Ludovic Courtès
2020-09-29 7:06 ` Efraim Flashner
2020-09-29 10:23 ` Ludovic Courtès
2020-09-28 17:10 ` [bug#43650] [PATCH 0/8] Assorted childhurd improvements Jan Nieuwenhuizen
2020-09-28 20:47 ` Ludovic Courtès
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