[Bug 235489] llan driver causes fatal kernel trap: 0x300 (data storage interrupt) when system is low on memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235489

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: luporl
Date: Tue Feb  5 18:16:14 UTC 2019
New revision: 343791
URL: https://svnweb.freebsd.org/changeset/base/343791

Log:
  [ppc64] llan: fix fatal kernel trap when system is low on memory

  When running several builders in parallel, on QEMU, with 8GB of
  memory, a fatal kernel trap (0x300 (data storage interrupt))
  caused by llan driver is sometimes observed, when the system
  starts to run out of swap space.

  This happens because, at llan_intr(), a phyp call to add a
  logical LAN buffer is always made when llan_add_rxbuf() fails,
  even if it fails to allocate a new buffer.

  PR:   235489
  Reviewed by:  jhibbits
  Differential Revision:        https://reviews.freebsd.org/D19084

Changes:
  head/sys/powerpc/pseries/phyp_llan.c

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