Date: Tue, 19 Sep 2017 12:54:47 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Andreas Longwitz <longwitz@incore.de> Cc: freebsd-fs@freebsd.org Subject: Re: nullfs with double mount is broken in FreeBSD 10 Stable Message-ID: <20170919095447.GZ78693@kib.kiev.ua> In-Reply-To: <59C0E45E.3070603@incore.de> References: <59C0E45E.3070603@incore.de>
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On Tue, Sep 19, 2017 at 11:33:18AM +0200, Andreas Longwitz wrote: > The described problem does not exist in V8, but in V10 Stable r317936. > > I use a device /dev/md2 defined in /etc/rc.conf: > > mdconfig_md2="-t swap -s 384m" > mdconfig_md2_newfs="-n" > mdconfig_md2_owner="root:wheel" > mdconfig_md2_perms="750" > > In /etc/fstab I have: > > /dev/md2 /tmp1 ufs rw,async,noatime,noauto 0 0 > /tmp1 /home/tmp1 nullfs rw,noauto 0 0 > /tmp1 /var/tmp1 nullfs rw,noauto 0 0 > > Now I run: > > mount /home/tmp1 > mount /var/tmp1 > while true; do > rm -f /home/tmp1/* > cpdup /boot/kernel /home/tmp1 > cp /var/tmp1/kernel /dev/null > df -h /tmp1 > done > > The output is > > Filesystem Size Used Avail Capacity Mounted on > /dev/md2 372M 88M 254M 26% /tmp1 > Filesystem Size Used Avail Capacity Mounted on > /dev/md2 372M 100M 242M 29% /tmp1 > Filesystem Size Used Avail Capacity Mounted on > /dev/md2 372M 112M 229M 33% /tmp1 > Filesystem Size Used Avail Capacity Mounted on > /dev/md2 372M 125M 217M 36% /tmp1 > ..... > > The "Used" space grows quickly until "No space available". > After umount /var/tmp1 the space is back again. > > I see the same behaviour when md is replaced by tmpfs. > > I have tried the patch from commit 317936 (V11) without success. > The problem exists on i386 and amd64. In production (V8) I use this > double mount construction for jail communication without any problems. Can you try the _latest_ stable/11 ? It is enough to only install the kernel, keep the userspace. If it does not help, perhaps you will need the -o nocache mount option.
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