Fix possible live-lock under heavy load where we can't allocate more memory for request. I was sure graid3 should handle such situations well, but green@ reported it is not and we want to fix it before 6.0.
Fix possible live-lock under heavy load where we can't allocate more
memory for request.
I was sure graid3 should handle such situations well, but green@ reported
it is not and we want to fix it before 6.0.

Submitted by:	green

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