NetBSD Problem Report #38270

From yamt@mwd.biglobe.ne.jp  Fri Mar 21 05:58:51 2008
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Date: Fri, 21 Mar 2008 14:58:47 +0900 (JST)
From: yamt@mwd.biglobe.ne.jp
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To: gnats-bugs@gnats.NetBSD.org
Subject: spurious OOM due to trylock
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>Number:         38270
>Category:       kern
>Synopsis:       spurious OOM due to trylock
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 21 06:00:01 +0000 2008
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 4.99.55
>Organization:

>Environment:
Architecture: i386
Machine: i386
>Description:
	consider that we have enough free pages but little swap.
	1. uvm_analloc fails due to vm_map trylock failure.
	2. uvm_reclaimable returns false.  while we have plenty of
	   free pages, it doesn't mean we have reclaimable pages.
	3. now the faulting process dies saying out of swap.
>How-To-Repeat:

>Fix:
	kill trylock.
	or don't assume that uvm_analloc failure is always due to
	memory shortage.

>Unformatted:

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