+++ This bug was initially created as a clone of Bug #1243372 +++

Description of problem:

iozone -a fails for pnfs mount throwing read: Bad file descriptor error.

#iozone -a

	Auto Mode
	Command line used: iozone -a
	Output is in Kbytes/sec
	Time Resolution = 0.000001 seconds.
	Processor cache size set to 1024 Kbytes.
	Processor cache line size set to 32 bytes.
	File stride size set to 17 * record size.
                                                            random  random    bkwd   record   stride                                   
              KB  reclen   write rewrite    read    reread    read   write    read  rewrite     read   fwrite frewrite   fread  freread
              64       4  576282 1392258
Error reading block 0 66700000
read: Bad file descriptor


Version-Release number of selected component (if applicable):
mainline

How reproducible:
almost (90%)

Steps to Reproduce:
1. Create a volume
2. Export via nfs-ganesha
3. Mount using pnfs(version = 4.1)
4. run iozone -a on the mount point

Actual results:
failed throwing bad file-descriptor error

Expected results:
should succeed

Additional info:
Only iozone -a (automated mode)fails

No crashes seen in bricks or nfs-ganesha

But when iozone run in individually (from test i = 0 to 8) all the test passes successfully.


It seems to be timing issue for performing the cache invalidation on the M.D.S