[Bug 1874057] Autopkgtest regression report (linux-oracle-5.4/5.4.0-1019.19~18.04.1)

All autopkgtests for the newly accepted linux-oracle-5.4 (5.4.0-1019.19~18.04.1) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

zfs-linux/unknown (armhf)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#linux-oracle-5.4

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1874057

Title:
[UBUNTU 20.04] s390x/pci: do not allow to create more pci functions
than configured via CONFIG_PCI_NR_FUNCTIONS

Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Focal:
Fix Released
Status in linux source package in Groovy:
In Progress

Bug description:
SRU Justification:
==================

[Impact]

* PCI Functions with UIDs >128 are currently not accounted correctly
in the s390x/pci (zPCI) code.

* Furthermore, the code allows that more than CONFIG_PCI_NR_FUNCTIONS
are created.

* This can lead to issues with data structures which were only
allocated for CONFIG_PCI_NR_FUNCTIONS.

[Fix]

* https://launchpadlibrarian.net/478235080/0001-s390-pci-Fix-
zpci_alloc_domain-over-allocation.patch

[Test Case]

* Set the kernel parameter CONFIG_PCI_NR_FUNCTIONS to a specific
(reasonablly low) number.

* And check if more PCI functions can be created than specified by
CONFIG_PCI_NR_FUNCTIONS (e.g. using a RoCE adapter) and watch for
kernel message 'Adding PCI function ... failed'

[Regression Potential]

* There is regression potential can be considered as low, since:

* the zPCI cards are less wide spread than for example ccw adapters on
s390x

* the fix got already upstream accepted in 5.7, hence upstream
reviewed, too

* the modifications span just two files and both are s390x arch
specific

[Other Info]

* the above patch-file is based on commit
969ae01bab2fe938b4c8324836038b5ac1c78fac ("s390/pci: Fix
zpci_alloc_domain() over allocation"), but this backport was needed
for getting this applied to focal master-next

* and this patch got upstream accepted with kernel v5.7-rc1, hence on
the long term it should be in 'gorilla'

__________

PCI Functions with UIDs >128 are currently not accounted correctly in
the s390x/pci code. Furthermore, the code allows that more than
CONFIG_PCI_NR_FUNCTIONS are created. This can lead to issues with data
structures which were only allocated for CONFIG_PCI_NR_FUNCTIONS.

This has been fixed in the following upstream commit:

969ae01bab2fe938b4c8324836038b5ac1c78fac
("s390/pci: Fix zpci_alloc_domain() over allocation")

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