** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1790480
Title:
random oopses on s390 systems using NVMe devices
Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
== SRU Justification ==
IBM is requesting a fix for the following issue found with NVMe devices on
s390x:
The trigger is a PCI function whose driver requests more interrupts
than the architectural maximum. Currently this is only possible with a
machine that supports 64 CPUs (or more) with a NVMe function attached.
Note that the LPAR does not have to use >=64 CPUs since the NVMe
driver uses num_possible_cpus() which is resolved to the machine
maximum on s390 (since all CPUs are hot-pluggable). The oops happens
after the driver calls pci_alloc_irq_vectors during device probing -
so most likely the system will panic during boot.
The fix has been cc'ed to stable@, but hasn't been picked up for
Bionic yet.
== Fix ==
866f3576a72b s390/pci: fix out of bounds access during irq setup
== Regression Potential ==
Low. Affects only s390x systems with more than 64 cpus and NVMe function
enabled.
== Test case ==
Boot the kernel in an affected environment.
=== Original bug description ===
Random oopses on s390 systems using NVMe and running the Ubuntu 18.04.1
kernel have been reported.
Bisect of the upstream kernel points to:
16ccfff28976 nvme: pci: pass max vectors as num_possible_cpus() to
pci_alloc_irq_vectors
This commit is correct but reveals a bug in s390s IRQ setup routine. A
fix is available fixed via:
Commit-ID : 866f3576a72b2233a76dffb80290f8086dc49e17
Need also be applied for Ubuntu 18.10
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1790480/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
