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Bug 157908 - Oops in ACPI code when booting with hyperthreading on
Summary: Oops in ACPI code when booting with hyperthreading on
Alias: None
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel
Version: 4.0
Hardware: All
OS: Linux
Target Milestone: ---
: ---
Assignee: Dave Jones
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2005-05-16 22:27 UTC by Manish Singh
Modified: 2015-01-04 22:19 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2005-05-19 00:33:33 UTC
Target Upstream Version:

Attachments (Terms of Use)

Description Manish Singh 2005-05-16 22:27:51 UTC
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 04:00:28 UTC
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 22:41:23 UTC
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 2005-05-19 00:33:33 UTC
BIOS update the did trick. Resolving accordingly.

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