------- Comment From niklas.schne...@ibm.com 2020-05-20 08:55 EDT-------
Verified working with proposed kernel!

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https://bugs.launchpad.net/bugs/1874058

Title:
  [UBUNTU 20.04] mlx5: alloc_pages_nodemask stack trace

Status in Ubuntu on IBM z Systems:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Focal:
  In Progress

Bug description:
  Using the mlx5 device driver on Ubuntu 20.04 (beta), the
  alloc_pages_nodemask code generates a stack trace when initializing a
  device. The driver tries to allocate more contiguous memory than is
  allowed by the platform specific FORCE_MAX_ZONEORDER setting.

  FORCE_MAX_ZONEORDER on s390x: 9
  FORCE_MAX_ZONEORDER on other platforms: 11 or more

  This issue only occurs on ConnectX5 devices because the mlx5_fw_tracer
  code is only used for physical functions.

  A fix for this has recently been pulled into David Miller's net tree as part 
of a series of Mellanox fixes:
  https://lore.kernel.org/netdev/20200420213606.44292-1-sae...@mellanox.com/

  It hasn't landed in Linus' tree yet though

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