NetBSD Problem Report #38271

From yamt@mwd.biglobe.ne.jp  Fri Mar 21 06:10:44 2008
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Date: Fri, 21 Mar 2008 15:10:41 +0900 (JST)
From: yamt@mwd.biglobe.ne.jp
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To: gnats-bugs@gnats.NetBSD.org
Subject: uvm_reclaimable is not mp-safe
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>Number:         38271
>Category:       kern
>Synopsis:       uvm_reclaimable is not mp-safe
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 21 06:15:00 +0000 2008
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 4.99.55
>Organization:

>Environment:
>Description:
	uvm_reclaimable() is used as the following.
	if another thread reclaims all reclaimable memory immediately after
	our alloc() is failed, we will goto fail possibly unnecessarily.

	p = alloc();
	if (p == NULL) {
		if (uvm_reclaimable()) {
			uvm_wait();
			goto retry;
		}
		goto fail;
	}
>How-To-Repeat:
	code inspection.
>Fix:

>Unformatted:

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