Bug 157424
Summary: | U1 kernel 2.6.9-6.37.EL ptrace panics | ||||||||||
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Product: | Red Hat Enterprise Linux 4 | Reporter: | Andrew Haley <aph> | ||||||||
Component: | kernel | Assignee: | David Woodhouse <dwmw2> | ||||||||
Status: | CLOSED CURRENTRELEASE | QA Contact: | Brian Brock <bbrock> | ||||||||
Severity: | medium | Docs Contact: | |||||||||
Priority: | medium | ||||||||||
Version: | 4.0 | CC: | bjohnson, davej, jlaska | ||||||||
Target Milestone: | --- | ||||||||||
Target Release: | --- | ||||||||||
Hardware: | powerpc | ||||||||||
OS: | Linux | ||||||||||
Whiteboard: | |||||||||||
Fixed In Version: | RHEL 4 U2 | Doc Type: | Bug Fix | ||||||||
Doc Text: | Story Points: | --- | |||||||||
Clone Of: | Environment: | ||||||||||
Last Closed: | 2006-08-21 15:06:51 UTC | Type: | --- | ||||||||
Regression: | --- | Mount Type: | --- | ||||||||
Documentation: | --- | CRM: | |||||||||
Verified Versions: | Category: | --- | |||||||||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||
Cloudforms Team: | --- | Target Upstream Version: | |||||||||
Embargoed: | |||||||||||
Attachments: |
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Description
Andrew Haley
2005-05-11 15:23:30 UTC
Created attachment 114247 [details]
kernel dump
Created attachment 114248 [details]
Proposed fix.
Yeah, looks obvious. We don't do the lazy fpu saving on SMP machines, and we
object violently to being asked to save the FPU for a non-current task.
Hm. Actually I'm unconvinced the above is anything more than a workaround. The BUG() will only trigger if MSR_FP is enabled for the child, and that really shouldn't be happening. *** Bug 157433 has been marked as a duplicate of this bug. *** *** Bug 157433 has been marked as a duplicate of this bug. *** Fixing kernel version and assigning. Created attachment 114293 [details]
Upstream fix.
This is the real fix. The problem we weren't correctly waiting for the inferior
to be taken off its CPU. Its register set really was in some other CPU, not in
the place we were looking for it, and that's why the FPU was still marked as
enabled.
*** Bug 157831 has been marked as a duplicate of this bug. *** |