Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755264Ab2JVPSC (ORCPT ); Mon, 22 Oct 2012 11:18:02 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:53318 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751554Ab2JVPR7 (ORCPT ); Mon, 22 Oct 2012 11:17:59 -0400 Date: Mon, 22 Oct 2012 11:17:58 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: "Artem S. Tashkinov" cc: bp@alien8.de, , , , , , , , Subject: Re: Re: Re: Re: Re: Re: A reliable kernel panic (3.6.2) and system crash when visiting a particular website In-Reply-To: <1906833625.122006.1350848941352.JavaMail.mail@webmail16> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2438 Lines: 80 On Sun, 21 Oct 2012, Artem S. Tashkinov wrote: > dmesg messages up to a crash can be seen here: https://bugzilla.kernel.org/attachment.cgi?id=84221 The first problem in the log is endpoint list corruption. Here's a debugging patch which should provide a little more information. Alan Stern drivers/usb/core/hcd.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) Index: usb-3.6/drivers/usb/core/hcd.c =================================================================== --- usb-3.6.orig/drivers/usb/core/hcd.c +++ usb-3.6/drivers/usb/core/hcd.c @@ -1083,6 +1083,8 @@ EXPORT_SYMBOL_GPL(usb_calc_bus_time); /*-------------------------------------------------------------------------*/ +static bool list_error; + /** * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue * @hcd: host controller to which @urb was submitted @@ -1126,6 +1128,20 @@ int usb_hcd_link_urb_to_ep(struct usb_hc */ if (HCD_RH_RUNNING(hcd)) { urb->unlinked = 0; + + { + struct list_head *cur = &urb->ep->urb_list; + struct list_head *prev = cur->prev; + + if (prev->next != cur && !list_error) { + list_error = true; + dev_err(&urb->dev->dev, + "ep %x list add corruption: %p %p %p\n", + urb->ep->desc.bEndpointAddress, + cur, prev, prev->next); + } + } + list_add_tail(&urb->urb_list, &urb->ep->urb_list); } else { rc = -ESHUTDOWN; @@ -1193,6 +1209,26 @@ void usb_hcd_unlink_urb_from_ep(struct u { /* clear all state linking urb to this dev (and hcd) */ spin_lock(&hcd_urb_list_lock); + { + struct list_head *cur = &urb->urb_list; + struct list_head *prev = cur->prev; + struct list_head *next = cur->next; + + if (prev->next != cur && !list_error) { + list_error = true; + dev_err(&urb->dev->dev, + "ep %x list del corruption prev: %p %p %p\n", + urb->ep->desc.bEndpointAddress, + cur, prev, prev->next); + } + if (next->prev != cur && !list_error) { + list_error = true; + dev_err(&urb->dev->dev, + "ep %x list del corruption next: %p %p %p\n", + urb->ep->desc.bEndpointAddress, + cur, next, next->prev); + } + } list_del_init(&urb->urb_list); spin_unlock(&hcd_urb_list_lock); } -- 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/