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kern/56533: fs/ffs/t_miscquota:default_deny_user_big fails randomly

>Number:         56533
>Category:       kern
>Synopsis:       fs/ffs/t_miscquota:default_deny_user_big fails randomly
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 03 10:00:01 +0000 2021
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2021.
System: NetBSD
Architecture: i386
Machine: i386

On multiple i386 testbeds, the fs/ffs/t_miscquota:default_deny_user_big
test case fails in about half the runs.  For example, in this recent
run on the TNF testbed, it was the sole unexpected failure:

It's failing not only under qemu, but also on real i386 hardware:

Bisection indicates that the problem started with this commit (which
is strange, as there is no obvious connection between the change and
the failing test case):

  2021. yamaguchi src/sys/net/if.c 1.492
  2021. yamaguchi src/sys/net/if.h 1.294


Install emulators/qemu and misc/py-anita from pkgsrc and run:

$ anita --memory-size 128M interact
login: root
# cd /usr/tests/fs/ffs
# while atf-run t_miscquota:default_deny_user_big; do true; done


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