kern/55945: rump/rumpkern/t_vm:busypage fails since early December

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         55945
>Category:       kern
>Synopsis:       rump/rumpkern/t_vm:busypage fails since early December
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 22 14:50:00 +0000 2021
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

On December 8, 2020, the TNF testbed sent the following report to
current-users.  The failure is still happening as of source date
2021.01.21.21.45.42.

  This is an automatically generated notice of a new failure of the
  NetBSD test suite.

  The newly failing test case is:

      rump/rumpkern/t_vm:busypage

  The above test failed in each of the last 4 test runs, and passed in
  at least 26 consecutive runs before that.

  Between the last successful test and the failed test, a total of 434
  revisions were committed, by the following developers:

      christos
      chs
      dholland
      jdc
      jmcneill
      mrg
      nia
      rillig
      rin
      sjg
      skrll
      thorpej
      tsutsui

  The first of these commits was made on CVS date 2020.12.05.18.17.01,
  and the last on 2020.12.07.10.02.51.

  Logs can be found at:

      http://releng.NetBSD.org/b5reports/i386/commits-2020.12.html#2020.12.07.10.02.51

>How-To-Repeat:

>Fix: