From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f71.google.com (mail-it0-f71.google.com [209.85.214.71]) by kanga.kvack.org (Postfix) with ESMTP id 52A3E6B026C for ; Mon, 6 Nov 2017 05:42:49 -0500 (EST) Received: by mail-it0-f71.google.com with SMTP id 143so5508819itf.1 for ; Mon, 06 Nov 2017 02:42:49 -0800 (PST) Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id a46sor4706513itj.102.2017.11.06.02.42.47 for (Google Transport Security); Mon, 06 Nov 2017 02:42:47 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <94eb2c19df188b1926055cf13c21@google.com> <20171102090951.drjf7wc2urcmtla5@node.shutemov.name> From: Dmitry Vyukov Date: Mon, 6 Nov 2017 11:42:26 +0100 Message-ID: Subject: Re: [alsa-devel] BUG: soft lockup Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-mm@kvack.org List-ID: To: Takashi Iwai Cc: "Kirill A. Shutemov" , syzbot , aaron.lu@intel.com, alsa-devel@alsa-project.org, Michal Hocko , Jan Kara , Minchan Kim , Peter Zijlstra , ying.huang@intel.com, syzkaller-bugs@googlegroups.com, LKML , linux-mm@kvack.org, "Aneesh Kumar K.V" , shli@fb.com, David Rientjes , Stephen Rothwell , Andrew Morton , zi.yan@cs.rutgers.edu, Matthew Wilcox , "Kirill A. Shutemov" On Mon, Nov 6, 2017 at 11:39 AM, Takashi Iwai wrote: > On Thu, 02 Nov 2017 10:09:51 +0100, > Kirill A. Shutemov wrote: >> >> On Thu, Nov 02, 2017 at 09:23:58AM +0100, Takashi Iwai wrote: >> > >> > Currently the least ALSA timer interrupt period is limited to 1ms. >> > Does it still too much? >> > >> > Can the reproducer triggers it reliably? If yes, could you forward >> > it, too (and config as well), so that I'll try to dig down more exact >> > code paths? >> >> All of that is part of original report: >> >> http://lkml.kernel.org/r/94eb2c19df188b1926055cf13c21@google.com >> >> marc.info hasn't stored repro.c for some reasone. Attached. >> >> I've just check it reproduces reliably for me in KVM. >> >> I also checked that it's not specific to THP -- still trigirable with huge >> pages disabled. > > I guess this is the same issue Jerome forwarded recently, and it was > fixed by limiting the amount of ALSA timer instances. I queued the > fix in sound git tree for-linus branch, commit > 9b7d869ee5a77ed4a462372bb89af622e705bfb8 > ALSA: timer: Limit max instances per timer > > It'll be likely included in 4.14 final. Thanks Let's also tell the bot what fixes this: #syz fix: ALSA: timer: Limit max instances per timer -- 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