NetBSD Problem Report #56357

From gson@gson.org  Wed Aug 11 07:50:28 2021
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Date: Wed, 11 Aug 2021 10:50:18 +0300 (EEST)
From: gson@gson.org (Andreas Gustafsson)
Reply-To: gson@gson.org (Andreas Gustafsson)
To: gnats-bugs@NetBSD.org
Subject: net/if_vlan/t_vlan:vlan_promisc test case randomly fails
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>Number:         56357
>Category:       kern
>Synopsis:       net/if_vlan/t_vlan:vlan_promisc test case randomly fails
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 11 07:55:00 +0000 2021
>Last-Modified:  Thu Aug 19 03:30:02 +0000 2021
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

The vlan_promisc test case of the net/if_vlan/t_vlan test randomly
fails on some testbeds, including a physical Dell Latitude D400 laptop
running NetBSD/i386:

  https://www.gson.org/netbsd/bugs/build/i386-laptop/2021/2021.08.10.10.43.42/test.html#net_if_vlan_t_vlan_vlan_promisc

and the qemu-based TNF sparc testbed:

  http://releng.netbsd.org/b5reports/sparc/2021/2021.08.04.13.50.47/test.html#net_if_vlan_t_vlan_vlan_promisc

In each case, the error message is

  Fail: regexp PROMISC not in stdout

>How-To-Repeat:

On an affected system, run

  cd /usr/tests/net/if_vlan
  while atf-run t_vlan:vlan_promisc; do true; done

>Fix:

>Audit-Trail:
From: "Shoichi YAMAGUCHI" <yamaguchi@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/56357 CVS commit: src/tests/net/if_vlan
Date: Thu, 19 Aug 2021 03:27:06 +0000

 Module Name:	src
 Committed By:	yamaguchi
 Date:		Thu Aug 19 03:27:05 UTC 2021

 Modified Files:
 	src/tests/net/if_vlan: Makefile bpfopen.c t_vlan.sh

 Log Message:
 Make the test program run in background after doing BIOCPROMISC

 t_vlan has rarely failed by checking IFF_PROMISC before the
 test program do BIOCPROMISC. To solve this, BIOCPROMISC is
 done in the foreground.

 fixes PR/56357


 To generate a diff of this commit:
 cvs rdiff -u -r1.3 -r1.4 src/tests/net/if_vlan/Makefile
 cvs rdiff -u -r1.1 -r1.2 src/tests/net/if_vlan/bpfopen.c
 cvs rdiff -u -r1.23 -r1.24 src/tests/net/if_vlan/t_vlan.sh

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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