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

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Date:	Fri, 01 Feb 2013 20:43:02 +0400
From:	Mike Lykov <combr@...dex.ru>
To:	Don Zickus <dzickus@...hat.com>
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

01.02.2013 19:59, Don Zickus пишет:
 > Hmm, that seems to make sense.  I was expecting that problem to pop up on
 > my end but didn't see.  I just asusmed the boot code didn't use that
 > decompressor.

Can you accumulate all our discussion and create one right-coded, 
kernelcode-styled patch?

 > Though I am not sure why that is leading to your other PATA problems
 > below.  Did you have similar problems when you used other decompression
 > levels?

In past - no. But I not test this last  kernel variant with other level.

 > I am not sure how to explain the differences.

I think this is similar as decompress:
Kernel stop and wait next try in "default_idle()" for 20-30 sec, and in 
this moment softlockup detector panics ;)

But without patch for touch_softlockup_watchdog in 
decompress_unlzma+misc.c it works (try, fail, pause, try, fail, go on).

-- 
Mike
Sapienti sat.
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