NFS rpc.mountd - memory leak?

Oxydius · n00b Joined: 18 Jan 2007 Posts: 8

I have an NFS server with 512MB of RAM.
When it boots, the memory usage is around 100MB and the rest is used for caching and buffering.
However, after a few days the NFS rpc.mountd process increases its memory consumption to the point where the RAM doesn't cache anything anymore. rpc.mountd consumes over 50% of the RAM and causes memory to be swapped. After a week, I had over 1GB of swap and rpc.mountd's virtual memory usage keeps growing. Restarting the nfs daemon once in a while fixes it before the kernel runs out of memory and the whole box crashes, but this really looks like a leak. My memory usage for the last month looks like a toothsaw with weekly peaks over 1.5GB.

Here are the options I use :
(/etc/export) /usr/portage 192.168.0.0/16(rw,sync,no_root_squash,no_subtree_check)
(/etc/fstab) server:/usr/portage /usr/portage nfs async,soft,intr,rw,lock,rsize=8192,wsize=8192 0 0

Did anyone else experience that?
I tried both nfs-utils-1.0.10 and nfs-utils-1.0.12-r3. Apparently, a leak was fixed between nfs-utils-1.0.12 and nfs-utils-1.0.12-r3 but it might be a different one.

RiBBiT · Apprentice Joined: 18 May 2005 Posts: 215 Location: Sweden

I haven't noticed anything out of the ordinary, although my NFS server rarely is on for more than 24 hours in a row. Current RAM usage for rpc.mountd is about 3 MB after an uptime of 8 hours. I have nfs-utils 1.0.12.
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Oxydius · n00b Joined: 18 Jan 2007 Posts: 8

I guess I'll submit a bug.

Last month
Last day

jjlawren · n00b Joined: 06 Feb 2006 Posts: 36

I've seen the same thing, running 2.6.19-r7 and nfs-utils-1.0.12-r3.

RAPHEAD · Posted: Tue May 01, 2007 9:43 am Post subject:

I Successfully using NFS4 with uptimes for days and several clients and it
odes not show such behaviour. Kernel 2.6.20

dspgen · Tux's lil' helper Joined: 17 Aug 2005 Posts: 103

system was very sluggish, and /usr/sbin/rpc.mountd was using 3G of virtual on system with 2G ram.
did /etc/init.d/nfs restart and all is well.
uname -a
Linux blue 2.6.21-gentoo #1 Mon Apr 30 06:20:30 EDT 2007 i686 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux

RAPHEAD · Posted: Sun May 06, 2007 4:27 pm Post subject:

Very strange, I suggest you report bugs regarding NFS4 to these people:

http://bugzilla.linux-nfs.org/

Here you can see some stats of my server:

dbserver1 ~ # uptime
18:21:19 up 8 days, 14:18, 5 users, load average: 2.91, 2.15, 1.69

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 5649 0.0 0.0 0 0 ? S< Apr28 0:00 [nfsd4]
root 5650 0.0 0.0 0 0 ? S Apr28 7:22 [nfsd]
root 5651 0.0 0.0 0 0 ? S Apr28 8:49 [nfsd]
root 5652 0.0 0.0 0 0 ? S Apr28 8:21 [nfsd]
root 5653 0.0 0.0 0 0 ? S Apr28 9:33 [nfsd]
root 5654 0.0 0.0 0 0 ? S Apr28 9:39 [nfsd]
root 5655 0.0 0.0 0 0 ? S Apr28 9:00 [nfsd]
root 5656 0.0 0.0 0 0 ? S Apr28 8:09 [nfsd]
root 5657 0.0 0.0 0 0 ? S Apr28 7:28 [nfsd]
root 23301 0.0 0.0 1696 620 pts/8 S+ 18:24 0:00 grep --colour=auto nfs
root 24585 0.0 0.0 0 0 ? S Apr28 0:00 [nfsv4-svc]

as you can see, it has almost no CPU and memory consumption

veal · n00b Joined: 08 May 2003 Posts: 47

same here, i had several out_of_memory reports in dmesg running 2.6.18-gentoo-r3 and nfs-utils-1.0.12 (used 37% of memory and swap was full, restart fixed it)

i upgraded nfs-utils at the following dates:
Wed Apr 6 13:01:29 2005 >>> net-fs/nfs-utils-1.0.6-r6
Mon Feb 26 16:49:12 2007 >>> net-fs/nfs-utils-1.0.10
Wed Mar 28 14:51:59 2007 >>> net-fs/nfs-utils-1.0.12

my uptime was 11days till yesterday when the out_of_memory exception occurred.
so 1.0.12 run previously for ~30days w/o any noticeable problems (i use nfs quite intensively having mp3/movies on my server)

will update now to nfs-utils-0.1.12-r3

in the nfs-utils-1.0.12-r1 changelog there seems to be a memleak fixed but seems there is still a problem? guess i will upgrade the kernel aswell if the problem persists

dspgen · Tux's lil' helper Joined: 17 Aug 2005 Posts: 103

I just upgraded from net-fs/nfs-utils-1.0.12 to net-fs/nfs-utils-1.1.0 (on both server and client), and it looks like it is fixed.

previously, rpc.mountd rss was 165312 after client had mounted 12 shares, then it jumped to 291680 when I shutdown the client - and it was slowly going up.

with the new version, it started at 708, then 740 after mounting 12 shares, then 748 after rebooting and remounting client. Maybe still leaking, but much slower. Anyway, I am now logging it every minute, and will post anything useful I find.