linux-kernel - Re: [alsa-devel] BUG: soft lockup

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Message-ID: <20171102090951.drjf7wc2urcmtla5@node.shutemov.name>
Date:   Thu, 2 Nov 2017 12:09:51 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot 
        <bot+63583aefef5457348dcfa06b87d4fd1378b26b09@...kaller.appspotmail.com>,
        aaron.lu@...el.com, alsa-devel@...a-project.org,
        Michal Hocko <mhocko@...e.com>, Jan Kara <jack@...e.cz>,
        Minchan Kim <minchan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, ying.huang@...el.com,
        syzkaller-bugs@...glegroups.com,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Takashi Iwai <tiwai@...e.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>, shli@...com,
        David Rientjes <rientjes@...gle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        zi.yan@...rutgers.edu, Matthew Wilcox <willy@...ux.intel.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [alsa-devel] BUG: soft lockup

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.

-- 
 Kirill A. Shutemov

View attachment "repro.c" of type "text/x-c" (4157 bytes)