Bug 439668

Problem is unreproducible on F-8:
  kernel-2.6.23.1-42.fc8.x86_64
  kernel-2.6.24.3-50.fc8.x86_64
on:
        Dual Core AMD Opteron(tm) Processor 275
        cpu family      : 15
        model           : 33
        stepping        : 2

Therefore also due to the problem specifics expecting it is an Intel CPU errata
but I did not find it listed at:
  http://www.intel.com/design/mobile/specupdt/309222.htm
  February 2008 Revision 016

The test case passes for me on my machines:

cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU            5120  @ 1.86GHz
stepping        : 6

I tried 2.6.24.3-34.fc8 and upstreamish bleeding edge hacking kernel.

Verified as reproducibile on dell-pe2850-01.rhts.boston.redhat.com (still the
same host but the problem is really common in the RHTS farm) after loading
microcode-20080220.dat as found in microcode_ctl-1.17-1.44.fc9 being loaded on
F-8 kernel-2.6.23.1-42.fc8.x86_64 using F-8 microcode_ctl-1.17-1.38.fc8.x86_64.

I will try to get Intel to evaluate this.

The problem is most probably listed as N37 in the Intel Errata suggested by
Geoff G.:
  http://www.intel.com/design/intarch/specupdt/249199.htm
so it affects Intel processors having in /proc/cpuinfo:
  cpu family : 15

Unfortunately from the N37 description I do not see a simple kernel workaround
for it, fortunately the problem is no longer present on the recent Intel CPUs.

Still this is not a response from Intel, just my preliminary expectation.

I just had various people on #devel run it, and here was one box that returned 1
from the test:

RHEL4.? running 2.6.9-68.26.EL.nmiwatchdog

cpu family      : 15
model           : 104
model name      : AMD Turion(tm) 64 X2 Mobile Technology TL-58
stepping        : 2

It's a laptop, aris is testing on it and says it's benl's. So that would seem to
argue against CPU erratum...

The erratum N37 description mentions several specific cases with many details,
and those cases are definitely not coming up in this test case.

(In reply to comment #8)
> It's a laptop, aris is testing on it and says it's benl's. So that would seem
> to argue against CPU erratum...

Tried it there (on AMD) repeatedly and the problem is really reproducible there.

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Verified on: kernel-2.6.29-0.207.rc7.ptrace.fc11.x86_64
"ptrace" - just removed:
ApplyPatch linux-2.6-utrace.patch

This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.

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Bug has been verified by CAI Qian as existing in RHEL-6 Beta 1.

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