kern/53865: udf_renamerace_dirs test fails on real hardware

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

>Number:         53865
>Category:       kern
>Synopsis:       udf_renamerace_dirs test fails on real hardware
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 13 11:30:00 +0000 2019
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

>Environment:
System: NetBSD guava.gson.org 7.2 NetBSD 7.2 (GENERIC.201808291900Z) amd64
Architecture: x86_64
Machine: amd64
>Description:

Running the ATF tests on real multi-core hardware, the
udf_renamerace_dirs test case of the fs/vfs/t_renamerace test fails
every time, with "mkdir: No space left on device".  For example:

  http://www.gson.org/netbsd/bugs/build/amd64-baremetal/2019/2019.01.10.23.10.23/test.html#fs_vfs_t_renamerace_udf_renamerace_dirs

Running under qemu on the TNF testbed, it passes every time.

See also 49046, "udf_renamerace test randomly fails".

>How-To-Repeat:

>Fix: