[Pvfs2-developers] RHEL4 and 2.7.1 mount problems

[Sam Lang]

Hi Bart,

After loading the pvfs2 kmod, can you do:

echo "1" > /proc/sys/pvfs2/debug

Then run the same test, and send the dmesg output to me?  This should  
show where the inode allocs/deallocs are going awry.

Thanks,
-sam

On May 2, 2008, at 4:00 PM, Bart Taylor wrote:

> Hey guys,
>
> I have been running some tests against the 271 release, and I am  
> having some trouble with multiple mounts on one client.  My setup  
> has 2 servers (both meta and io servers on local disk) and one  
> client all of which are running RHEL4 update 6. All that was done on  
> the test client is loading the kernel module and starting pvfs2- 
> client.  I can mount the file system once and use it without any  
> problem, but I have attached a test script - takes file system  
> information and a number of times to mount it - that keeps failing.   
> Here are the steps it executes:
>
> - For the number of mounts requested
>    - Create a new directory (defaults to /tmp/mount_limit.#)
>    - Mount the specified file system on the new dir
>
> - For the number of mounts requested
>    - Do a recursive ls comparison (keep a copy the first time  
> through and compare subsequent mounts to the first)
>    - Unmount the dir
>    - Delete the dir
>
> I have been able to consistently reproduce the problem running the  
> attached script like this:
> ./test-mount-limit.pl pvfs2-server1:3334/pvfs2-fs 100
> It stalls every time with either 36 or 37 mounts remaining.  The  
> script has been successfully run on previous versions of pvfs2 up to  
> several thousand mounts.
>
> The problem comes at the umount step.  Eventually the process just  
> hangs, strands a bunch of mounts, and umount doesn't work as  
> expected after that even from the command line.  When it stalls, I  
> start seeing messages like this one in dmesg and syslog:
> May  2 15:02:44 client-node kernel: pvfs2_kill_sb: (WARNING) number  
> of inode allocs (4100) != number of inode deallocs (2665)
>
> I am running this against an almost empty file system since the  
> recursive ls would take a while if it were large. Am I doing  
> something wrong/strange here, or is there a client/kernel problem?  
> The test seems pretty straight-forward, and I've never had an issue  
> with the script before. I'm not sure if it was run against the 2.7.0  
> release though.
>
> Bart.
> <test-mount-limit.pl>_______________________________________________
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