Date: Fri, 1 Dec 2017 13:41:24 +1100 From: Jason Tubnor <jason@tubnor.net> To: Kai Gallasch <k@free.de> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: Linux lockups inside bhyve VM on FreeBSD 11.1 Message-ID: <CACLnyCKsLuGyEy_2ozXjNJ7CEG=wRopACDe4vnfxV-Tya4dVHg@mail.gmail.com> In-Reply-To: <5b1166b2-0b8c-248c-9a3b-b5c9685e4f37@free.de> References: <5b1166b2-0b8c-248c-9a3b-b5c9685e4f37@free.de>
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On 1 December 2017 at 08:29, Kai Gallasch <k@free.de> wrote: > Hello. > > Last day an apache 2.4 running inside a Debian9 linux bhyve VM locked up > on one of my servers (FreeBSD 11.1-RELENG, GENERIC kernel) overloading > the VM. > > The VM uses a ZFS zvol blockdevice on top of a zpool, consisting of two > mirrored SSDs. > > I was able to enter the VM through the bhyve console, kill and restart > the stuck apache process and regain stability inside the VM. > > I found below output in the Linux dmesg and suspect the ext4 journaling > to be the culprit. > > Has anyone experienced similar lockups running Linux inside a bhyve VM? > At the time when this happened there was no high I/O on the VM zpool. Have you set vfs.zfs.arc_max to a lower value to allow for bhyve head room? How was the host system swap, did the host start to eat into it? I run a few guests with Ubuntu 16.04 but mainly use XFS for areas that aren't system related and haven't come across this issue. Cheers, Jason.
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