From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id F11956B026C for ; Mon, 6 Nov 2017 05:39:47 -0500 (EST) Received: by mail-pg0-f72.google.com with SMTP id b192so12379882pga.14 for ; Mon, 06 Nov 2017 02:39:47 -0800 (PST) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id g59si10104077plb.260.2017.11.06.02.39.46 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 06 Nov 2017 02:39:47 -0800 (PST) Date: Mon, 06 Nov 2017 11:39:41 +0100 Message-ID: From: Takashi Iwai Subject: Re: [alsa-devel] BUG: soft lockup In-Reply-To: <20171102090951.drjf7wc2urcmtla5@node.shutemov.name> References: <94eb2c19df188b1926055cf13c21@google.com> <20171102090951.drjf7wc2urcmtla5@node.shutemov.name> MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Dmitry Vyukov , 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 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, Takashi -- 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