nc-pv
n00b
Joined: 01 Oct 2012
Posts: 45
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 Posted: Wed Apr 23, 2014 4:34 pm Post subject: [SOLVED] aufs memory leak |
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I have a Gentoo Linux running on diskless station.
I am using SquashFS image as root filesystem.
Following folders are mounted with AUFS to make them writable: /etc, /home/user, /var/lib, /var/log
I noticed mysterious free space disappearance on /var/lib mount point. Investigation has lead to discovering of the following fact:
Performing | Code: | | touch /var/lib/test-file |
decreases free space on 4096 bytes. Space is not being freed after | Code: | | rm /var/lib/test-file |
But doing touch again (with same filename) does not decrease free space.
Same thing would occur on | Code: | | echo "" > /var/lib/test-file |
wich narrows issue down to:
It takes 4096 bytes to create new file on aufs mount point and this space will not be freed after file deletion. It is also true that space would be subtracted only once per file. Consequent file creations (using same path and name) will not decrease the space.
Could anyone with knowledge on the matter give me advice on what to do to fix it? Should I file a bug report?
Here are some command outputs for reference:
| Code: |
computer ~ # uname -a
Linux computer 3.13.5-aufs #2 SMP Wed Mar 19 09:52:37 EDT 2014 x86_64 Intel(R) Atom(TM) CPU D2550 @ 1.86GHz GenuineIntel GNU/Linux
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| Code: |
computer ~ # zcat /proc/config.gz | grep "AUFS"
CONFIG_AUFS_FS=y
CONFIG_AUFS_BRANCH_MAX_127=y
# CONFIG_AUFS_BRANCH_MAX_511 is not set
# CONFIG_AUFS_BRANCH_MAX_1023 is not set
# CONFIG_AUFS_BRANCH_MAX_32767 is not set
CONFIG_AUFS_SBILIST=y
# CONFIG_AUFS_HNOTIFY is not set
CONFIG_AUFS_RDU=y
# CONFIG_AUFS_SP_IATTR is not set
# CONFIG_AUFS_SHWH is not set
CONFIG_AUFS_BR_RAMFS=y
# CONFIG_AUFS_BR_FUSE is not set
CONFIG_AUFS_BDEV_LOOP=y
# CONFIG_AUFS_DEBUG is not set
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| Code: |
computer ~ # df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/loop0 298240 298240 0 100% /
etc-tmpfs 298240 298240 0 100% /aufs/etc
var-tmpfs 298240 298240 0 100% /aufs/var/log
varlib-tmpfs 298240 298240 0 100% /aufs/var/lib
varspool-tmpfs 298240 298240 0 100% /aufs/var/spool
home-tmpfs 298240 298240 0 100% /aufs/home/user
etc-aufs 32768 128 32640 1% /etc
var-aufs 32768 408 32360 2% /var/log
varlib-aufs 16384 864 15520 6% /var/lib
varspool-aufs 16384 1792 14592 11% /var/spool
home-aufs 2560000 120868 2439132 5% /home/user
tmpfs 404800 568 404232 1% /run
udev 10240 0 10240 0% /dev
shm 2023988 0 2023988 0% /dev/shm
cgroup_root 10240 0 10240 0% /sys/fs/cgroup
tmpfs 10240 4 10236 1% /var/lib/misc
tmpfs 1048576 4 1048572 1% /tmp
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| Code: |
computer ~ # mount
/dev/loop0 on / type squashfs (ro,relatime)
etc-aufs on /etc type aufs (rw,relatime,si=ad25961ecb76ef6b)
var-aufs on /var/log type aufs (rw,relatime,si=ad25961ecb76bf6b)
varlib-aufs on /var/lib type aufs (rw,relatime,si=ad25961ecb769f6b)
varspool-aufs on /var/spool type aufs (rw,relatime,si=ad25961f5defff6b)
home-aufs on /home/user type aufs (rw,relatime,si=ad25961f5defcf6b)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,size=404800k,mode=755)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=10240k,nr_inodes=505344,mode=755)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
cgroup_root on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
openrc on /sys/fs/cgroup/openrc type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/lib64/rc/sh/cgroup-release-agent.sh,name=openrc)
cpuset on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cpu on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cpuacct on /sys/fs/cgroup/cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct)
freezer on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
tmpfs on /var/lib/misc type tmpfs (rw,relatime,size=10240k)
tmpfs on /tmp type tmpfs (rw,relatime,size=1048576k)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
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Last edited by nc-pv on Thu Apr 24, 2014 2:04 pm; edited 1 time in total |
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