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To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
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From: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Subject: [pve-devel] applied: [PATCH qemu-server] mediated devices: fix race
condition in vm reboot
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Am 07/03/2024 um 10:33 schrieb Dominik Csapak:
> when triggering a vm reboot from the host (via cli/api), the reboot code
> is called under a guest lock, which creates a reboot request, shuts down
> the vm and calls the regular cleanup code (which includes the mdev
> cleanup).
>
> in parallel the qmeventd sees the vanished vm, and starts 'qm cleanup'
> which is (among other tasks) used to restart a vm with a pending reboot
> request. It does this also under a guest lock, with a default timeout of
> 10 seconds.
>
> Since we currently wait 10 seconds for the nvidia driver to clean the
> mdev, this creates a race condition for the cleanup lock. Iow. when the
> call to `qm cleanup` starts before we started to sleep for 10 seconds,
> it will not be able to acquire its lock and not start the vm again.
>
> To fix it, do two things:
> * increase the timeout in `qm cleanup` to 60 seconds
> (technically this still might run into a timeout, as we can configure
> up to 16 mediated devices with up to 10 seconds sleep each, but
> realistically most users won't configure more than two or three of
> them, if even that)
>
> * change the `sleep 10` to a loop sleeping for 1 second each before
> checking the state again. This shortens the timeout when the driver
> can clean it up in the meantime.
>
> Further, add a bit of logging, so we can properly see in the (task) log
> what is happening when.
>
> Fixes: 49c51a60 (pci: workaround nvidia driver issue on mdev cleanup)
> Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
> ---
> PVE/CLI/qm.pm | 3 ++-
> PVE/QemuServer.pm | 16 ++++++++++++----
> 2 files changed, 14 insertions(+), 5 deletions(-)
>
>
applied with Mira's R-b, thanks!
Albeit I amended the commit to reword the message slightly and to switch
from using warn to print for such informational messages.
As both stdout and stderr shows up in task log that should not matter,
some code might wire up $SIG{__WARN__} though, causing potentially
confusing syslog noise or even failures.