Re: kern/50167: recent dksubr.c locking changes broke Xen

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/50167; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/50167: recent dksubr.c locking changes broke Xen
Date: Fri, 28 Aug 2015 20:01:24 +0000 (UTC)

 bouyer%antioche.eu.org@localhost writes:
 
 >	recent changes to locking in dksubr.c broke Xen, because
 >	xbd(4) calls dk_start() from interrupt context:
 >(from http://www-soc.lip6.fr/~bouyer/NetBSD-tests/xen/HEAD/i386/201508230910Z_anita.txt)
 >mlock error: Mutex: mutex_vector_enter: locking against myself: lock 0xc129b09c cpu 0 lwp 0xc1505d40
 
 This is not interrupt context, but the start routine can call the done
 routine while locked. This should be fixed by now.
 
 Can you please verify?
 
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                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."