** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
** Changed in: linux (Ubuntu Xenial)
Assignee: Taco Screen team (taco-screen-team) => Tim Gardner (timg-tpi)
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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:
In Progress
Status in linux source package in Xenial:
In Progress
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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