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DescriptionOndrej Valousek
2011-10-14 07:21:27 UTC
Created attachment 528160[details]
/var/log/messages from a diskless system running RHEL-6
System hangs when (processes stuck in the D state) a diskless system booting from a NFS server uses NFSv4.
A SysRQ traces and the kernel log is attached.
The problem is easily reproducible.
Note that the "adclient" process that you see stuck in the D state is getting
user/group attributes (UIDs/GIDs) from Active Directory.
I guess there must be some dead loop here as well where rpc.idmapd is asking
for user's name and hence it uses (indirectly, via the NSS library) adclient to
complete the job.
I am looking for some ideas on how to avoid this situation.
Ondrej
Did some more investigation and it turned out that adclient uses /var/centrifydc directory which _was_ mounted via NFSv4.
The problem seems to vanish (I can not replicate) if I mount the directory via NFSv3 - which makes a sense actually.
Sorry for wasting your time here - please close this call.
Thanks,
Ondrej
(In reply to comment #4)
> Did some more investigation and it turned out that adclient uses
> /var/centrifydc directory which _was_ mounted via NFSv4.
> The problem seems to vanish (I can not replicate) if I mount the directory via
> NFSv3 - which makes a sense actually.
Yes, that's as expected; thanks for the confirmation.
Created attachment 528160 [details] /var/log/messages from a diskless system running RHEL-6 System hangs when (processes stuck in the D state) a diskless system booting from a NFS server uses NFSv4. A SysRQ traces and the kernel log is attached. The problem is easily reproducible.