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Date:      Sat, 09 Feb 2002 01:26:20 GMT
From:      Tor.Egge@cvsup.no.freebsd.org
To:        julian@elischer.org
Cc:        gene@nttmcl.com, david@catwhisker.org, current@FreeBSD.ORG
Subject:   Re: Hang on flushing buffers w/today's -CURRENT, SMP system
Message-ID:  <20020209012620H.tegge@cvsup.no.freebsd.org>
In-Reply-To: <Pine.BSF.4.21.0202081707390.4147-100000@InterJet.elischer.org>
References:  <20020208170536.A265@alicia.nttmcl.com> <Pine.BSF.4.21.0202081707390.4147-100000@InterJet.elischer.org>

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> hmmmm  so what is the difference between your kernel and mine that works?
> 
> just out of curiosity, have you tried a very latest -current? 
> do you have your own config? how does GENERIC behave?
> (what kind of disks do you have?)

It looks like a call to setrunqueue() was incorrectly dropped in 
the latest version of kern_shutdown.c.

Index: kern_shutdown.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/kern_shutdown.c,v
retrieving revision 1.118
diff -u -r1.118 kern_shutdown.c
--- kern_shutdown.c	7 Feb 2002 20:58:44 -0000	1.118
+++ kern_shutdown.c	9 Feb 2002 01:11:18 -0000
@@ -272,6 +272,7 @@
 				DROP_GIANT();
    				for (subiter = 0; subiter < 50 * iter; subiter++) {
      					mtx_lock_spin(&sched_lock);
+     					setrunqueue(curthread);
 					curthread->td_proc->p_stats->p_ru.ru_nvcsw++;
      					mi_switch(); /* Allow interrupt threads to run */
      					mtx_unlock_spin(&sched_lock);


- Tor Egge

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