linux-kernel - RE: BUG: soft lockup detected on Phenom with Debian 2.6.24-4

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Date:	Thu, 3 Apr 2008 02:04:23 +0100
From:	"Schmielau, Tim" <T.Schmielau@....ac.uk>
To:	"Peter Oruba" <peter.oruba@....com>,
	"Laurent GUERBY" <laurent@...rby.net>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: BUG: soft lockup detected on Phenom with Debian 2.6.24-4

On Thu 3/20/2008 1:45 PM, Peter Oruba wrote:
 
> you may have triggered the L2 eviction bug (E298).
> 
> Please try
> 
> hexdump -s 0xc0010015 -n 8 -C /dev/cpu/0/msr
> 
> Output is little-endian, so the left-most byte must have bit 3 enabled meaning 
> TLB caching is disabled.

While this question was not directed at me, I indeed find that bit 3 of the
leftmost byte is set with 2.6.24:

  # hexdump -s 0xc0010015 -n 8 -C /dev/cpu/0/msr
  c0010015  18 00 00 01 00 00 00 00                           |........|
  c001001d
  # uname -a
  Linux quad 2.6.24.4-default #1 SMP Mon Mar 31 18:51:48 BST 2008 x86_64 x86_64 x86_64 GNU/Linux

while (as expected) it was zero running 2.6.23.17 patched with the erratum 298
workaround. Yet I saw the lockups with both kernels.

Thanks,
Tim
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