kernel hang on reading /proc/<pid>/stat

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I am running kernel 2.4.18 + SGI xfs 1.1 + Trond NFS patch +
ext2_get_block_blk_removal on bi-PIII SMP kernel (Compaq DL360) with 4Gb
memory

the ps -ef hang in reading /proc/<pid>/stat after displaying some of the
process.

top & vmstat hang too !

the rest of process continue to run OK !

the machine was up for 1 week before this ! and now it's 2 time in 4 hour
which it does this !

NB : look like "ps -ax hang with Mozilla in 2.4.9" but I am on a 2.4.18 !!
but don't find how it have been corrected to check !

any help would be appreciated !
valery
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