This bug was fixed in the package linux - 5.4.0-42.46
---
linux (5.4.0-42.46) focal; urgency=medium
* focal/linux: 5.4.0-42.46 -proposed tracker (LP: #1887069)
* linux 4.15.0-109-generic network DoS regression vs -108 (LP: #1886668)
- SAUCE: Revert "netprio_cgroup: Fix
** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1874055
Title:
[UBUNTU 20.04] s390x/pci: s390_pci_mmio_write/read fail
This bug was fixed in the package linux - 5.4.0-40.44
---
linux (5.4.0-40.44) focal; urgency=medium
* linux-oem-5.6-tools-common and -tools-host should be dropped (LP: #1881120)
- [Packaging] Add Conflicts/Replaces to remove linux-oem-5.6-tools-common
and
-tools-host
Thanks Niklas! Adjusting tags accordingly.
** Tags removed: verification-needed-focal
** Tags added: verification-done-focal
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Title:
[UBUNTU
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
the tag
** Changed in: ubuntu-z-systems
Status: In Progress => Fix Committed
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Title:
[UBUNTU 20.04] s390x/pci: s390_pci_mmio_write/read fail when
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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Title:
[UBUNTU 20.04] s390x/pci: s390_pci_mmio_write/read fail
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
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Kernel SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2020-May/thread.html#110497
Updating status to 'In Progress'.
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
** Changed in: ubuntu-z-systems
Status: Triaged => In Progress
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You received
** Description changed:
SRU Justification:
==
[Impact]
* Code that is using s390_pci_mmio_write/read system calls on a z15
(that comes with enhanced PCI load/store instructions), fails with
"Unable to handle kernel pointer dereference in virtual kernel address
** Description changed:
SRU Justification:
==
[Impact]
* Code that is using s390_pci_mmio_write/read system calls on a z15
(that comes with enhanced PCI load/store instructions), fails with
"Unable to handle kernel pointer dereference in virtual kernel address
Hi Niklas, thanks - I'll adjust the justification slightly and will
reference your comment - especially regarding the test and the now
upstream acceptance.
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** Description changed:
SRU Justification:
==
[Impact]
* Code that is using s390_pci_mmio_write/read system calls on a z15
(that comes with enhanced PCI load/store instructions), fails with
"Unable to handle kernel pointer dereference in virtual kernel address
Hi Niklas, please can you have a look at the SRU Justification that I've now
added to the bug description, with special focus on Test Case and Regression
Potential.
Please let me know if is inaccurate or missing or in case additional
information should be added (this is mandatory information
It's now also in linux-next, tagged with 'next-20200515'.
Pretty big patch for an SRU, but can cherry-picked cleanly from focal
master-next.
I'll start to prepare the SRU soon - changing status to Triaged ...
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Changed in:
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Canonical Kernel
Team
That should be okay to SRU, but was this fix already brought upstream?
And if so would you please share the commit (or backport) that does apply
cleanly to the focal master-next tree?
** Changed in: ubuntu-z-systems
Status: New => Incomplete
** Changed in: ubuntu-z-systems
Importance:
** Description changed:
- Description will follow
+ One of the PCI enhancements on Z15 are the enhanced PCI load/store
+ instructions which can be executed directly from user space code. When
+ these instructions are available and preexisting user space code still
+ uses the old
** Summary changed:
- s390x/pci: s390_pci_mmio_write/read fail when MIO instructions are available
+ [UBUNTU 20.04] s390x/pci: s390_pci_mmio_write/read fail when MIO instructions
are available
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