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[Bug 1545037] Re: Surelock-GA2:kernel panic/ exception @ pcibios_set_pcie_reset_state+0x118/0x280 + cxl_reset+0x5c/0xc0

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Date: Fri, 12 Feb 2016 15:37:54 -0000
Reply-to: Bug 1545037 <1545037@xxxxxxxxxxxxxxxxxx>
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** Tags removed: targetmilestone-inin---
** Tags added: targetmilestone-inin1604

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https://bugs.launchpad.net/bugs/1545037

Title:
  Surelock-GA2:kernel panic/ exception @
  pcibios_set_pcie_reset_state+0x118/0x280 + cxl_reset+0x5c/0xc0

Status in linux package in Ubuntu:
  New

Bug description:
  Requesting Canonical kernel team apply
  5b8255dd55f61ff1f65774a2084823415ec09a90 from upstream for 16.04

  Recent bug activity recap:

  == Comment: #17 - Guo Wen Shan  - 2016-02-08 22:40:35 ==
  Tentative patch sent to Andrew for verification. I'm putting a note here about the root cause: Each PE (struct eeh_pe) instance is tracking the primary bus by "pbus". When we have full hotplug as EEH recovery, the PE instance won't be refreshed. So the "pbus" is still dereferencing the stale PCI bus. Access to that at later pointer will cause kernel crash.

  The fix, as the patch sent to Andrew for verification, introduces
  another EEH PE flag (EEH_PE_PRI_BUS). That flag represents the
  validity of eeh_pe::pbus. Before unplugging in full hotplug case, the
  flag is cleared so that the eeh_pe::pbus can be updated at plugging
  time. I will send the patch to linux-ppc-dev for review after Andrew
  verified it helps.

  == Comment: #18 - Guo Wen Shan - 2016-02-08 23:55:00 ==
  The patch was sent to linux-ppc-dev for review/pickup: https://patchwork.ozlabs.org/patch/580626/ which reads "[v2,1/4] powerpc/eeh: Fix stale cached primary bus".

  == Comment: #19 - Andrew Donnellan - 2016-02-09 00:19:33 ==
  Patch has been submitted as per Gavin's comment. Please test!

  == Comment: #22 - Andrew Donnellan - 2016-02-11 01:41:06 ==
  Requesting Canonical kernel team apply 5b8255dd55f61ff1f65774a2084823415ec09a90 from upstream for 16.04

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