linux-kernel - Re: [BUG?] false positive in soft lockup detector while unlzma initramfs on slow cpu

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Date:	Thu, 31 Jan 2013 09:46:27 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Mike Lykov <combr@...dex.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
	kirill@...temov.name
Subject: Re: [BUG?] false positive in soft lockup detector while unlzma
 initramfs on slow cpu

On Thu, Jan 31, 2013 at 03:21:02PM +0400, Mike Lykov wrote:
> 
> 30.01.2013 19:40, Don Zickus пишет:
> > I have never seen usage like 'kernel.watchdog_thresh=30'.  Could you try
> > 'watchdog_thresh=30' instead?
> 
> Ok. "kernel.watchdog_thresh=30" is a sysctl presentation, i mixed
> them wrongly.
> 
> Your patch about cmd support for 'watchdog_thresh=30' working. I
> tested it: parameter applies and lzma -9 initramfs loading
> successfully.
> If I delete parameter from cmdline - same kernel not boot.

Good to know.

> 
> > I also attached another patch as suggested by Andrew to add a
> > touch_softlockup_watchdog in the unlzma routine.  Probably makes things
> > run a little slower.  Compiled tested only.
> 
> In my case (3.2.32) it cannot compile:
> 
>   LD      arch/x86/boot/compressed/vmlinux
> arch/x86/boot/compressed/misc.o: In function `decompress_kernel':
> misc.c:(.text+0x993): undefined reference to `touch_softlockup_watchdog'

I think Andrew's suggestion is a better approach which is add the
touch_softlockup_watchdog.  So I would have to see you .config file to
understand the compile warning.

Cheers,
Don
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