Bug 846042 - No soundcard detected and general slow responsiveness with gnome shell when home on NFS
No soundcard detected and general slow responsiveness with gnome shell when h...
Product: Fedora
Classification: Fedora
Component: pulseaudio (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Lennart Poettering
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-08-06 11:57 EDT by oll
Modified: 2013-07-31 23:10 EDT (History)
5 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-07-31 23:10:23 EDT
Type: Bug
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Description oll 2012-08-06 11:57:54 EDT
If want to migrate my users from F14 to F17 but I encounter this blocking problem.
All users have their home exported by a NFS server.(NFSv4/krb5)

Homes are correctly automounted with the right rights (gssd and idmapd work well)
But gnome (gnome shell-no fallback) doesn't recognize the soundcard
Furthermore, when you browse the menus of applications, it's really slow (for instance, each opening of one firefox menu - file, edit, view, etc... - take 1 second)

It doesn't happen with the same remote users using Fedora 14. (gnome reacts fast and soundcard is recognized)

It doesn't happen neither with a local account on a Fedora 17 (ie when the home directory is on the hard drive) : soundcard is recognized (speakers icon appears) and gnome is responsive.

After investigation, it happears that pulseaudio didn't succeed in creating the ~/.pulse directory when ~ is a NFS share. Here is a piece of the trace of the pulseaudio -k command :

mkdir("/home/olelain/.pulse", 0700)     = 0
umask(02)                               = 077
open("/home/olelain/.pulse", O_RDONLY|O_NOCTTY|O_NOFOLLOW|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
getuid()                                = 781
getgid()                                = 119
fchown(3, 781, 119)                     = -1 EINVAL (Invalid argument)
rmdir("/home/olelain/.pulse")           = 0

Furthermore, running wireshark, it appears that this generates around 50 nfs packets (trying to create the ~/.pulse directory and adding an entry in ~/.xsession-error : )  each time I open a menu (I wonder why gnome wants to play a sound each time ? .. anyway). 
This is what causes the 1 second latency and makes gnome not responsive.

I tried to google "fchown+nfs" whithout success (I'm far from being a kernel expert).
Comment 1 oll 2012-08-06 12:31:14 EDT
Hmm..actually, it looks more like a NFS issue than a pulseaudio one:

On a F14 station :

-bash-4.2$ mount |grep olelain
nfs-server:/olelain on /home/olelain type nfs4 (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=krb5,clientaddr=***,local_lock=none,addr=***)
-bash-4.2$ chown olelain zz
chown: changing ownership of `zz': Invalid argument

On a F14 station : 

-bash-4.1$ mount|grep olelain
nfs-server:/olelain on /home/olelain type nfs4 (rw,file,sec=krb5,hard,tcp,sloppy,addr=***,clientaddr=***)
-bash-4.1$ chown olelain zz

So no error on F14. F14 and F17 have the same autofs settings. I wonder where the local_lock=none comes from and if it's the cause of the error.
Comment 2 oll 2012-08-07 03:58:26 EDT
Definitively a NFS4 problem. Maybe I should open another bug since the souncard problem is a far consequence.

idmapd dies :

# systemctl status nfs-idmap.service
nfs-idmap.service - NFSv4 ID-name mapping daemon
	  Loaded: loaded (/usr/lib/systemd/system/nfs-idmap.service; enabled)
	  Active: inactive (dead)
	  CGroup: name=systemd:/system/nfs-idmap.service

/proc/net/rpc/nfs4.nametoid/channel is missing : 

]# rpc.idmapd -f -vvvv
rpc.idmapd: libnfsidmap: using domain: ***
rpc.idmapd: libnfsidmap: Realms list: '***' 
rpc.idmapd: libnfsidmap: processing 'Method' list
rpc.idmapd: libnfsidmap: loaded plugin /lib64/libnfsidmap/nsswitch.so for method nsswitch

rpc.idmapd: Expiration time is 600 seconds.
rpc.idmapd: nfsdopenone: Opening /proc/net/rpc/nfs4.nametoid/channel failed: errno 2 (No such file or directory)

# rpm -q kernel nfs-utils
Comment 3 oll 2012-08-07 05:58:58 EDT
Just read this :

Sorry so for the confusion.

Anyway, the chown bug remains.
What I dont understand is that nfsidmap seems to work since I see the right attributes (owner and groups).
But it seems to work only for name to uid, not for uid to name
Indeed, sniffing nfs packets with wireshark, I see olelain@nfsdomain for each getattr but the nfs client sends olelain@dnsdomain for each settr, instead of olelain@nfsdomain (my nfsdomain, in idmapd.conf is different of the dnsname of my stations)

In abstract, it looks like nfsidmap works for name to id , but not for id to name.
Comment 4 Fedora End Of Life 2013-07-03 19:59:00 EDT
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Comment 5 Fedora End Of Life 2013-07-31 23:10:28 EDT
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