Re: nfs_refresh_inode: inode number mismatch

[Chuck Lever <chuck.lever@oracle.com>]

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Hi Chris-

Chris Carlson wrote:
> We are running MontaVista Embedded Linux 2.4 with NetApps NFS servers as 
> the root filesystem and Linux 2.6 mounted filesystems.  A simple test 
> runs to copy files from one mount point to another (both are different 
> directories on the same NFS server mounted at differet points).
> 
> After 30 copies of a hundred files are made, the system is rebooted and 
> the test repeats.
> 
> After 2 reboots, an NFS file is created, and we get the following error 
> from the kernel:
> 
> nfs_refresh_inode: inode number mismatch
> expected (0x11/0xdacea3), got (0x11/0xb8d5e3)
> 
> We're just trying to figure out what to do to figure out what the 
> problem is.  Is there a good place to place printks or breakpoints?

This may be due to an RPC XID collision.  Which 2.4 kernel are you 
using?  The Linux NFS client may be sending the same XID sequence on the 
same port number after each reboot, in which case the server will 
respond with a cached reply rather than doing real work.  The cached 
reply may contain old file ID information, which triggers the "inode 
number mismatch" message you see in your log.

One way to detect if this is happening is to use "pktt" on the filer. 
You can capture a packet trace across client reboots to determine if

A) the transport socket's port number is the same across reboots, and

B) the RPC XID sequence is the same

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