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kern/48028: Read from /dev/random hangs

>Number:         48028
>Category:       kern
>Synopsis:       Read from /dev/random hangs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 08 03:00:01 +0000 2013
>Originator:     Aran Clauson
>Release:        6.99.23
NetBSD sanders 6.99.23 NetBSD 6.99.23 (GENERIC) #7: Sun Jul  7 19:08:24 PDT 
2013  aran@sanders:/home/NetBSD/obj/sys/arch/amd64/compile/GENERIC amd64
At boot, cgdconfig hangs when configuring randomly keyed device.  The hang 
occurs when reading from /dev/random.  I've chased this into 
sys/kern/subr_cprng.c line 197 in the call to cv_wait_sig.  
Compiler source from July 2, 2013, boot, read from /dev/random while 
initializing the system.

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