Bug 157908 - Oops in ACPI code when booting with hyperthreading on
Oops in ACPI code when booting with hyperthreading on
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Dave Jones
Brian Brock
Depends On:
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Reported: 2005-05-16 18:27 EDT by Manish Singh
Modified: 2015-01-04 17:19 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2005-05-18 20:33:33 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Manish Singh 2005-05-16 18:27:51 EDT
With 2.6.9-9.EL, the kernel crashes on boot with hyperthreading turned on. With
HT off, it boots fine. This happens on both x86_64 and ia32 (on the same
hardware, a dual 3.4 GHz Xeon). The same machine boots with 5.0.5.EL perfectly.

On x86_64, it gives the following errors:

ACPI-0292: *** Error: Looking up [_PCT] in namespace, AE_ALREADY_EXISTS

and then oopses with a NULL pointer dereference in acpi_ps_parse_aml.
Comment 1 Venkatesh Pallipadi 2005-05-18 00:00:28 EDT
This is a known BIOS issue. Same as this one..

I have seen this fixed in BIOS in various platforms. Can you make sure you are
running the latest BIOS.

What platform is this? 

Comment 2 Manish Singh 2005-05-18 18:41:23 EDT
These boxes are EM64T capable, but the problem happens in both 64 and 32-bit modes.

These are prerelease systems on loan from Intel, so an old BIOS wouldn't be
surprising. I'll try to a find out an update through partner channels and let
you know the results.
Comment 3 Manish Singh 2005-05-18 20:33:33 EDT
BIOS update the did trick. Resolving accordingly.

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