From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FB12C10F05 for ; Mon, 1 Apr 2019 21:13:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 51A2D2133D for ; Mon, 1 Apr 2019 21:13:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554153238; bh=Lgdt0twy1g6qL1tYqpgMpCFN6e0QKzGNoBPyYjZknQM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=X2L6Sd+3Osuyqcu6KLOg7Du6AD2NsQ7U9iKWPpD1+LvHRMdW0Nl1doeHr7hKPLPmw gME3hmJSprXxI9Q29xYTzhsansEEUXY2klAr7obA/s0OBcYryT2XWdsX+HMGEyrFt4 g9ubTSZtCHodWORIl41JMcLI3zhFCymCEnrcYHkE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728642AbfDAVN5 (ORCPT ); Mon, 1 Apr 2019 17:13:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:40732 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726501AbfDAVN4 (ORCPT ); Mon, 1 Apr 2019 17:13:56 -0400 Received: from localhost (unknown [69.71.4.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 566CA20880; Mon, 1 Apr 2019 21:13:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554153235; bh=Lgdt0twy1g6qL1tYqpgMpCFN6e0QKzGNoBPyYjZknQM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NWrCTEmnN/wgWiDVSzXoWa0p0mBy43IyCJFbjJSgEfGhRsSLtrUmDnqkuuFqmUZw8 +GcNScO5mB51EukXQ4X9cXeEH5zeoVtelLtMIFhKJn7vvpPnzT1xQjq2Y2jrEApKwj XAPhWQXGdwtp3pRrHkgYh/7DVdlb6F/vYFIAHMy4= Date: Mon, 1 Apr 2019 16:13:53 -0500 From: Bjorn Helgaas To: Jesse Hathaway Cc: Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Mathias Nyman , Greg Kroah-Hartman , Alan Stern , linux-usb@vger.kernel.org Subject: Re: Regression causes a hang on boot with a Comtrol PCI card Message-ID: <20190401211353.GA7263@google.com> References: <20190313232112.GC210027@google.com> <20190321232310.GL251185@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [+cc Mathias, Greg, Alan, linux-usb] Beginning of thread: https://lore.kernel.org/linux-pci/CANSNSoWiKd98Dt1N2sSjP9Af8zk1NPV-=3P4VLtFs_cSQG4RUg@mail.gmail.com Synopsis: v5.0 hangs at boot unless the following commits are reverted: 1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones") 1c3c5eab1715 ("sched/core: Enable might_sleep() and smp_processor_id() checks early") The hang appears to be in quirk_usb_early_handoff(). With "initcall_debug", we see the call but not the completion: On Fri, Mar 22, 2019 at 03:02:11PM -0500, Jesse Hathaway wrote: > > So apparently the hang happens while we're running the "final" PCI > > fixups. This happens after all the rest of PCI is initialized. > > > > Can you boot v5.0 vanilla with "initcall_debug"? Maybe we can narrow > > it down to a specific quirk. > > yup, added the "initcall_debug" output to the ticket: > https://bugzilla.kernel.org/show_bug.cgi?id=202927, here is the tail end > > [ 14.896337] NET: Registered protocol family 1 > [ 14.901314] initcall af_unix_init+0x0/0x4e returned 0 after 4866 usecs > [ 14.908694] calling ipv6_offload_init+0x0/0x7f @ 1 > [ 14.914238] initcall ipv6_offload_init+0x0/0x7f returned 0 after 1 usecs > [ 14.921821] calling vlan_offload_init+0x0/0x20 @ 1 > [ 14.927365] initcall vlan_offload_init+0x0/0x20 returned 0 after 0 usecs > [ 14.934948] calling pci_apply_final_quirks+0x0/0x126 @ 1 > [ 14.941106] pci 0000:00:1a.0: calling quirk_usb_early_handoff+0x0/0x6a0 @ 1 > > thanks, Jesse Hathaway