kernel-packages team mailing list archive

[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

After discussions the below was the recommendation:

"Below are the list of upstream commits that rewrites the machine check:

a68c33f powerpc: Fix endian issues in power7/8 machine check handler
30c8263 Move precessing of MCE queued event out from syscall exit path.
4e243b7 powerpc: Fix "attempt to move .org backwards" error
b63a0ff powerpc/powernv: Machine check exception handling.
28446de powerpc/powernv: Remove machine check handling in OPAL.
b5ff421 powerpc/book3s: Queue up and process delayed MCE events.
36df96f powerpc/book3s: Decode and save machine check event.
ae744f3 powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on
e22a227 powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on
0440705 powerpc/book3s: Add flush_tlb operation in cpu_spec.
4c70341 powerpc/book3s: Introduce a early machine check hook in cpu_spec.
1c51089 powerpc/book3s: Return from interrupt if coming from evil context.
1e9b450 powerpc/book3s: handle machine check in Linux host.
729b0f7 powerpc/book3s: Introduce exclusive emergency stack for machine check ex
b14a7253 powerpc/book3s: Split the common exception prolog logic into two sectio

Additional commits that are in linux-next:

ece980f powerpc/book3s: Fix CFAR clobbering issue in machine check handler.
55672ec powerpc/book3s: Recover from MC in sapphire on SCOM read via MMIO.

Beloe is the link to a critical fix that I posted to ppc-devel
yesterday:

https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-March/116447.html

There is one more critical fix in machine handling path on its way, which
I will post soon to ppc-devel after the tests. Will send you the link as
soon as I post that to the ppc-devel and the commit ids once available
upstream."

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https://bugs.launchpad.net/bugs/1301424

Title:
  powerpc: opal machine checks lead to kernel oops and application
  SIGSEGV

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Trusty:
  Fix Committed

Bug description:
  We're suffering kernel Oopses on multiple Power machines running
  Ubuntu 14.04 beta levels, with kernels ranging from (at least) 3.13.0-16
  through 3.13.0-19. We are running Ubuntu directly on top of OPAL,
  without KVM.

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