Re: [Linux-ia64] Panic in linuxrc (2.4.7)

[richard offer <offer@sgi.com>]

* frm davidm@hpl.hp.com "08/01/01 18:13:14 -0700" | sed '1,$s/^/* /'
*
*>>>>> On Wed, 1 Aug 2001 16:15:43 -0700, David Mosberger
*>>>>> <davidm@hpl.hp.com> said:
* 
*   David> Do you have CONFIG_PERFMON enabled?  If not, try turning it
*   David> on.  We are investigating the problem.  It looks to be a
*   David> Heisenbug: the problem gets triggered depending on what the
*   David> exact code layout is.  Adding or removing a single bundle in
*   David> the right place seems to make the difference...
* 
* OK, this turns out to be due to an assembler bug: the assembler fails
* to put a stop bit in front of an "alloc" instruction if the "alloc" is
* preceded by a .align directive and the directive inserts one or more
* "nop" bundles. ;-(
* 
* This bug was difficult to track down because it got triggered while
* psr.ic was cleared, which means that the IP reported in the tombstone
* is all wrong and there is no easy way to find out at which address the
* real fault occurred.  Well, at least the workaround is easy:
* 

[snip]

* Please try again with this patch applied.

That seems to have done the trick, although I enabled PERFMON at the same
time.

Thanks.

* 
* 	--david

richard.

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Richard Offer                     Technical Lead, Trust Technology, SGI
"Specialization is for insects"
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