From owner-freebsd-bugs  Thu Mar 12 18:27:22 1998
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id SAA26800
          for freebsd-bugs-outgoing; Thu, 12 Mar 1998 18:27:22 -0800 (PST)
          (envelope-from owner-freebsd-bugs@FreeBSD.ORG)
Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id SAA26791;
          Thu, 12 Mar 1998 18:27:16 -0800 (PST)
          (envelope-from bde@godzilla.zeta.org.au)
Received: (from bde@localhost)
	by godzilla.zeta.org.au (8.8.7/8.8.7) id NAA32629;
	Fri, 13 Mar 1998 13:22:16 +1100
Date: Fri, 13 Mar 1998 13:22:16 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199803130222.NAA32629@godzilla.zeta.org.au>
To: bugs@FreeBSD.ORG
Subject: sleep holding a simple lock
Cc: dyson@FreeBSD.ORG
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

	/*
	 * Destroy the copy in the VM cache, too.
	 */
	simple_lock(&vp->v_interlock);
	object = vp->v_object;
	if (object != NULL) {
		if (flags & V_SAVEMETA)
			vm_object_page_remove(object, 0, object->size,
				(flags & V_SAVE) ? TRUE : FALSE);
		else
			vm_object_page_remove(object, 0, 0,
				(flags & V_SAVE) ? TRUE : FALSE);
	}
	simple_unlock(&vp->v_interlock);

The above code in vfs_subr.c sleeps holding a simple lock if
vm_object_page_remove() sleeps.  There is obviously no way for
vm_object_page_remove() to release the lock.

Bruce

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message