From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f69.google.com (mail-it0-f69.google.com [209.85.214.69]) by kanga.kvack.org (Postfix) with ESMTP id 8421A828EA for ; Thu, 9 Jun 2016 14:14:08 -0400 (EDT) Received: by mail-it0-f69.google.com with SMTP id z189so80194177itg.2 for ; Thu, 09 Jun 2016 11:14:08 -0700 (PDT) Received: from iolanthe.rowland.org (iolanthe.rowland.org. [192.131.102.54]) by mx.google.com with SMTP id b74si5020553ioj.3.2016.06.09.11.14.07 for ; Thu, 09 Jun 2016 11:14:07 -0700 (PDT) Date: Thu, 9 Jun 2016 14:14:06 -0400 (EDT) From: Alan Stern Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code] In-Reply-To: <20160609172444.GB6277@invalid> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: M G Berberich Cc: USB list , linux-mm@kvack.org On Thu, 9 Jun 2016, M G Berberich wrote: > Hello, > > With 4.7-rc2, after detecting a USB Mass Storage device > > [ 11.589843] usb-storage 4-2:1.0: USB Mass Storage device detected > > a constant flow of kernel-BUGS is reported (several per second). > > [ 11.599215] BUG: using smp_processor_id() in preemptible [00000000] code: > systemd-udevd/389 > [ 11.599218] caller is debug_smp_processor_id+0x17/0x20 > [ 11.599220] CPU: 4 PID: 389 Comm: systemd-udevd Not tainted 4.7.0-rc2 #6 > [ 11.599220] Hardware name: Gigabyte Technology Co., Ltd. H87-HD3/H87-HD3, > BIOS F10 08/18/2015 > [ 11.599223] 0000000000000000 ffff88080466b6c8 ffffffff813fc42d > 0000000000000004 > [ 11.599224] ffffffff81cc1da3 ffff88080466b6f8 ffffffff8141a0f6 > 0000000000000000 > [ 11.599226] ffff880809fe8d98 0000000000000001 00000000000fffff > ffff88080466b708 > [ 11.599226] Call Trace: > [ 11.599229] [] dump_stack+0x4f/0x72 > [ 11.599231] [] check_preemption_disabled+0xd6/0xe0 > [ 11.599233] [] debug_smp_processor_id+0x17/0x20 > [ 11.599235] [] alloc_iova_fast+0xb6/0x210 > [ 11.599238] [] ? __wait_on_bit+0x6f/0x90 > [ 11.599240] [] intel_alloc_iova+0x9d/0xd0 > [ 11.599241] [] __intel_map_single+0x93/0x190 > [ 11.599242] [] intel_map_page+0x34/0x40 > > Please see https://bugzilla.kernel.org/show_bug.cgi?id=119801 for a > more complete kernel-log This looks like a bug in the memory management subsystem. It should be reported on the linux-mm mailing list (CC'ed). Alan Stern -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org