kern/47661: t_swsensor tests are flaky

[jmmv%netbsd.org@localhost]

>Number:         47661
>Category:       kern
>Synopsis:       t_swsensor tests are flaky
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 17 06:25:01 +0000 2013
>Originator:     Julio Merino
>Release:        NetBSD 6.99.17
>Organization:
        
>Environment:
        
        
System: NetBSD nbair.virtual.network 6.99.17 NetBSD 6.99.17 (GENERIC) #13: Sat 
Mar 16 11:23:16 JST 2013 
jmmv@nbair.virtual.network:/home/jmmv/os/netbsd/amd64/obj/home/jmmv/os/netbsd/src/sys/arch/amd64/compile/GENERIC
 amd64
Architecture: x86_64
Machine: amd64
>Description:
        The entropy_polled_sensor and entropy_interrupt_sensor tests in
        dev/sysmon/t_swsensor are flaky: they fail in various steps,
        sometimes.

        I've seen failures in 15a and 15b for sure, and I seem to recall
        failures in 14* as well.

        This is on amd64 and not inside qemu.
>How-To-Repeat:
        Run t_swsensor in a loop and wait for it to fail.  Usually will fail
        on the first try.
>Fix:
        Dunno.  Fix the tests or fix the code.

>Unformatted: