[Bug 2019069] Re: Log messages from dpdk library overflow and is written as multiple lines causing issues for testsuite

[Frode Nordahl]

I think this openvswitch commit [0] which cites a glibc discussion [1]
may also be relevant.

In questing the autopkgtest is now failing [2] with a strange permission
denied error, a hunch is that the workaround of running the test under a
short top level directory may be biting us.  Will try to remove the
workaround to see what happens.

0: https://github.com/openvswitch/ovs/commit/cb5aebd6dc77917d8e9a02a274367c4e6ba5f5ca
1: https://sourceware.org/bugzilla/show_bug.cgi?id=31137
2: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/amd64/o/openvswitch/20250803_125734_99cbc@/log.gz

** Bug watch added: Sourceware.org Bugzilla #31137
   https://sourceware.org/bugzilla/show_bug.cgi?id=31137

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https://bugs.launchpad.net/bugs/2019069

Title:
  Log messages from dpdk library overflow and is written as multiple
  lines causing issues for testsuite

Status in dpdk package in Ubuntu:
  New
Status in openvswitch package in Ubuntu:
  Incomplete

Bug description:
  The Open vSwitch system testsuites make assertions based on contents
  of the ovs-vswitchd.log file.

  While attempting to enable the DPDK system tests as part of the
  autopkgtests, we found that currently the log messages from DPDK
  overflow and are written out across multiple lines.

  I find nothing obvious in OVS that causes this, so I wonder if this is
  an issue in DPDK, how we build/relate it in Ubuntu or if OVS needs to
  initialize it differently.

  Example log excerpts:
  Log line:
  2023-05-09T14:48:05.958Z|00063|dpdk|INFO|VHOST_CONFIG: (/tmp/autopkgtest.FzfwzO/autopkgtest_tmp/o/src/_debian/tests/system-dpdk-testsuite.dir/07/dpdkvhostclient0) vhost-
  2023-05-09T14:48:05.958Z|00064|dpdk|INFO|user client: socket created, fd: 116

  Assertion:
  ../../tests/system-dpdk.at:335: grep "VHOST_CONFIG: ($OVS_RUNDIR/dpdkvhostclient0) vhost-user client: socket created" ovs-vswitchd.log
  stdout:
  ../../tests/system-dpdk.at:335: exit code was 1, expected 0

  Log line:
  2023-05-09T16:51:15.505Z|00066|dpdk|WARN|VHOST_CONFIG: (/tmp/nqQypV/_debian/tests/system-dpdk-testsuite.dir/03/dpdkvhostclient0) failed to connect: No such file or direc
  2023-05-09T16:51:15.505Z|00067|dpdk|WARN|tory

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