kern/52306: drvctl hangs the kernel on unloading aibs0 (8.0_BETA)

[dmb%yenn.ulegend.net@localhost]

>Number:         52306
>Category:       kern
>Synopsis:       drvctl hangs the kernel on unloading aibs0 (8.0_BETA)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 16 22:55:00 +0000 2017
>Originator:     Dominik Bialy
>Release:        NetBSD 8.0_BETA
>Organization:
Underlegend Networks
>Environment:
System: NetBSD yenn 8.0_BETA NetBSD 8.0_BETA (YENN) #2: Thu Jun 15 05:53:36 UTC 2017 builds@yenn:/var/obj/sys/arch/amd64/compile/YENN amd64
Architecture: x86_64
Machine: amd64
>Description:
	Trying to unload aibs0 using drvctl causes the kernel to sit in idle_loop
>How-To-Repeat:
	Try tu unload aibs0 on NetBSD 8.0_BETA from Jun 13 2017.
>Fix:
	No idea.  To mitigate just don't try to unload the driver.