Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758092AbYHVUy2 (ORCPT ); Fri, 22 Aug 2008 16:54:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756328AbYHVUyG (ORCPT ); Fri, 22 Aug 2008 16:54:06 -0400 Received: from py-out-1112.google.com ([64.233.166.180]:44768 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756168AbYHVUyE (ORCPT ); Fri, 22 Aug 2008 16:54:04 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=uCHuBeovo4zOt4rsHfYqVq1bwrYm9+LNCj37cdKQeIVH3iCZ3rwgpz+3ckC+xTrFw6 CXUeTLttlNp6j+v6uFHH9H43AEbPymSDICiPs4nBoYH46T0IGkcswTQITTpB9aTD/JJl jz0fZnrsVapE+HsTxdXUTSgWAWsK4LUzBsNCI= Message-ID: <6278d2220808221354s7b978e28q718a0654cb4b34eb@mail.gmail.com> Date: Fri, 22 Aug 2008 21:54:03 +0100 From: "Daniel J Blueman" To: "Linux Kernel" Subject: [2.6.27-rc4] MAX_LOCK_DEPTH too low... MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1199 Lines: 27 When running some kvm testing on 2.6.27-rc4 with various kernel debug options enabled, I hit the MAX_LOCK_DEPTH limit of 48: [ 30.670253] uhci_hcd 0000:00:1d.2: FGR not stopped yet! [ 30.701773] uhci_hcd 0000:00:1d.1: FGR not stopped yet! [ 30.733533] uhci_hcd 0000:00:1d.0: FGR not stopped yet! [ 30.765379] uhci_hcd 0000:00:1a.2: FGR not stopped yet! [ 30.797253] uhci_hcd 0000:00:1a.0: FGR not stopped yet! [ 115.469934] uhci_hcd 0000:00:1d.0: FGR not stopped yet! [ 184.507012] Hangcheck: hangcheck value past margin! [ 245.448004] BUG: MAX_LOCK_DEPTH too low! [ 245.448004] turning off the locking correctness validator. [ 260.937296] kvm: emulating exchange as write [ 364.507049] Hangcheck: hangcheck value past margin! [ 544.454998] Hangcheck: hangcheck value past margin! [ 724.507006] Hangcheck: hangcheck value past margin! Maybe the result of a particular path abusing a lock (ie a bug) even? Daniel -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/