Hi everyone,

I have an issue with NFS client when the NFS client loose connection with the NFS server. In certain conditions the NFS client freeze and the result is kernel panic. It seems that kernel panic occurs when the NFS client try to unmount the unreachable remote NFS partition.

This case occurs about one time each two days.

CentOS version: CentOS Linux release 7.1.1503 (Core)
Kernel version: Linux foo.bar 3.10.0-229.4.2.el7.x86_64 #1 SMP Wed May 13 10:06:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux NFS packages: nfs-utils-1.3.0-0.8.el7.x86_64, libnfsidmap-0.25-11.el7.x86_64

This issue is present only on CentOS7 NFS client (not present with CentOS6).

Any ideas? Is it known problem with CentOS7 NFS client?

Logs and stack trace here after:

nfs: server foo.bar not responding, timed out nfs: server foo.bar not responding, timed out nfs: server foo.bar not responding, timed out nfs: server foo.bar not responding, timed out nfs: server foo.bar not responding, timed out BUG: Dentry ffff8800ca82f380{i8c0,n=foo.png} still in use (2) [unmount of nfs4 0:41]
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