[Bug 606523] [NEW] INFO: task nfsd:5047 blocked for more than 120 seconds.

[Thag]

Public bug reported:

This is triggered by high volume NFS traffic. This box has 3 fibre channel volumes that are exported over NFS.
I started with a 10.04 linux-server kernel, which died regularly at least once a day.
I started upgrading to try the ppa kernels and the frequency has decreased but all of the kernels below have this same problem:

ii  linux-headers-2.6.32-22-server       2.6.32-22.36                                    Linux kernel headers for version 2.6.32 on x
ii  linux-image-2.6.32-22-server         2.6.32-22.36                                    Linux kernel image for version 2.6.32 on x86
ii  linux-image-2.6.32-23-server         2.6.32-23.37                                    Linux kernel image for version 2.6.32 on x86
ii  linux-image-2.6.34-5-server          2.6.34-5.14~lucid1                              Linux kernel image for version 2.6.34 on x86
ii  linux-image-2.6.35-6-server          2.6.35-6.9~lucid1                               Linux kernel image for version 2.6.35 on x86
ii  linux-image-2.6.35-7-server          2.6.35-7.11~lucid1                              Linux kernel image for version 2.6.35 on x86
ii  linux-image-2.6.35-8-server          2.6.35-8.13~lucid1                              Linux kernel image for version 2.6.35 on x86
ii  linux-image-server                   2.6.32.23.24                                    Linux kernel image on Server Equipment.

The only thing that I can think of that's a bit funny in this config is
that in order to make all servers have consistent automounter paths, we
map all exported devices via NFS, which means that users are using an
automounted NFS path for a local drive. Yes, not optimal but it solves a
lot of other problems.

dmesg and lspci attached

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
INFO: task nfsd:5047 blocked for more than 120 seconds.
https://bugs.launchpad.net/bugs/606523
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to linux in ubuntu.