From owner-cvs-all Sat Mar 9 8:24:32 2002 Delivered-To: cvs-all@freebsd.org Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21]) by hub.freebsd.org (Postfix) with ESMTP id 1710C37B400; Sat, 9 Mar 2002 08:24:29 -0800 (PST) Received: (from tegge@localhost) by freefall.freebsd.org (8.11.6/8.11.6) id g29GOTZ84788; Sat, 9 Mar 2002 08:24:29 -0800 (PST) (envelope-from tegge) Message-Id: <200203091624.g29GOTZ84788@freefall.freebsd.org> From: Tor Egge Date: Sat, 9 Mar 2002 08:24:29 -0800 (PST) To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/vm vm_kern.c X-FreeBSD-CVS-Branch: HEAD Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG tegge 2002/03/09 08:24:28 PST Modified files: sys/vm vm_kern.c Log: Revert change in revision 1.53 and add a small comment to protect the revived code. vm pages newly allocated are marked busy (PG_BUSY), thus calling vm_page_delete before the pages has been freed or unbusied will cause a deadlock since vm_page_object_page_remove will wait for the busy flag to be cleared. This can be triggered by calling malloc with size > PAGE_SIZE and the M_NOWAIT flag on systems low on physical free memory. A kernel module that reproduces the problem, written by Logan Gabriel , can be found in the freebsd-hackers mail archive (12 Apr 2001). The problem was recently noticed again by Archie Cobbs . Reviewed by: dillon Revision Changes Path 1.75 +12 -0 src/sys/vm/vm_kern.c To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message