Date: Fri, 3 Feb 2017 09:09:29 +0100 From: Giulio Ferro <auryn@zirakzigil.org> To: freebsd-hackers@freebsd.org Subject: Re: Leak in file backed swap Message-ID: <bdbac761-99c9-58d4-2ee7-0dca4ad6b21c@zirakzigil.org> In-Reply-To: <20170203053051.GA90481@server.rulingia.com> References: <2ba8c327-56c9-e0ff-e449-a583b6106540@zirakzigil.org> <20170203053051.GA90481@server.rulingia.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 03/02/2017 06:30, Peter Jeremy wrote: > On 2017-Feb-02 15:59:36 +0100, Giulio Ferro <auryn@zirakzigil.org> wrote: >> FreeBSD 11-Stable recent build. >> >> I've set up a FreeBSD instance in AWS with 1GB RAM. >> >> and I created a 1GB file under /usr on the instance FS and proceeded to >> mount it as swap. >> >> Even if the machine isn't doing anything, after one day or less the >> machine becomes unresponsive > I've used swap to UFS and swap to NFS on a number of hosts without > problem. If your /usr was on ZFS then this is a known issue (ZFS > is CoW and there are known problems dealing with RAM shortage). If > not, can you please give more precise details of your configuration. > Nope, it's standard UFS: /etc/fstab # Custom /etc/fstab for FreeBSD VM images /dev/gpt/rootfs / ufs rw 1 1 I suspect it may be something related to AWS images... Anyway I actually think that it should be quite easy to replicate: you just need to create an AWS instance from the images in the community section of AWS (FreeBSD 11-stable something), create a 1GB file /usr/swap0 on the file system and mount it /etc/fstab ... md99 none swap sw,file=/usr/swap0,late 0 0 After one day or less the instance will become unresponsive... Giulio
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bdbac761-99c9-58d4-2ee7-0dca4ad6b21c>