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Message-ID: <18841.54304.460011.351580@harpo.it.uu.se>
Date:	Mon, 16 Feb 2009 22:01:20 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Andreas Mohr <andi@...as.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org,
	Tejun Heo <htejun@...il.com>
Subject: Re: [BUG] 2.6.29-rc2-git1 to -rc5: libata lockup on boot, LED solid,
	100% CPU

Andreas Mohr writes:
 > Hello all,
 > 
 > My Inspiron 8000 ICH2 (i810) P3/700 UP has a hard time booting 2.6.29 things:
 > 
 > [loaded init, shell stuff]
 > ...
 > ata1.00: configured for UDMA/100
 > ata1.01: configured for UDMA/33
 > ata1: EH complete
 > ...
 > Uniform CD-ROM driver Revision: 3.20
 > [LAST LINE, FULL STOP]
 > ---> hangs with IDE LED solidly on! <---
 > 
 > NOTE: kernel did NOT hang when accidentally running rc2-git1 w/o any modules loaded!
 > (IOW, probably a module-related hang)
 > disabling sr_mod.ko will make a boot proceed a tiny bit, then hang anyway
 > 
 > Could be mutex deadlock (CPU hot, 100%?)
 > no log errors whatsoever
 > latest known working: .28-rc6 (admittedly somewhat old; DOES work currently)
 > earliest known buggy: -rc2-git1, -rc4 also, -rc5 also
 > no SysRq available (notebook keys: no workey, /proc/sysrq obviously
 > not available either)
 > 
 > Should I test 2.6.28.5? Every build will take two hours though...
 > Not ATA-SFF 32bit bug problem, right? (already committed?)
 > http://marc.info/?l=linux-kernel&m=123254501314058&w=2

To me it looks like the 32-bit PIO bug. The patch you cited above was
just the first to identify the issue. This is still unfixed in 29-rc5.
Please test Sergei's latest proposed patch posted yesterday to linux-ide.
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