kern/102654: panic: sleeping thread

[Robert Watson]

The following reply was made to PR kern/102654; it has been noted by GNATS.

From: Robert Watson <rwatson at FreeBSD.org>
To: Eric van Gyzen <eric at vangyzen.net>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/102654: panic: sleeping thread
Date: Thu, 21 Dec 2006 20:00:39 +0000 (GMT)

 On Thu, 14 Dec 2006, Eric van Gyzen wrote:
 
 > I just realized I forgot to submit a backtrace:
 >
 > (kgdb) bt
 > #0  doadump () at pcpu.h:165
 > #1  0xc0523d45 in boot (howto=260) at /freebsd/src/sys/kern/kern_shutdown.c:402
 > #2  0xc052400c in panic (fmt=0xc06a8c28 "sleeping thread")
 >    at /freebsd/src/sys/kern/kern_shutdown.c:558
 > #3  0xc0543e7c in propagate_priority (td=0xc3989000)
 >    at /freebsd/src/sys/kern/subr_turnstile.c:196
 > #4  0xc054465e in turnstile_wait (lock=0xc070db20, owner=0xc3989000)
 >    at /freebsd/src/sys/kern/subr_turnstile.c:634
 > #5  0xc051b2f4 in _mtx_lock_sleep (m=0xc070db20, tid=3256848768, opts=0,
 >    file=0x0, line=0) at /freebsd/src/sys/kern/kern_mutex.c:565
 > #6  0xc06154ba in vm_pagezero (arg=0x0)
 >    at /freebsd/src/sys/vm/vm_zeroidle.c:159
 > #7  0xc050daa8 in fork_exit (callout=0xc0615464 <vm_pagezero>, arg=0x0,
 >    frame=0xcc9b4d38) at /freebsd/src/sys/kern/kern_fork.c:805
 > #8  0xc06598bc in fork_trampoline ()
 >    at /freebsd/src/sys/i386/i386/exception.s:208
 
 The attached patch, appropriately munged for the version of FreeBSD you're 
 running, may help.  Or not, I suppose. :-)
 
 Robert N M Watson
 Computer Laboratory
 University of Cambridge
 
 Index: vm_zeroidle.c
 ===================================================================
 RCS file: /home/ncvs/src/sys/vm/vm_zeroidle.c,v
 retrieving revision 1.41
 diff -u -r1.41 vm_zeroidle.c
 --- vm_zeroidle.c	6 Dec 2006 06:34:57 -0000	1.41
 +++ vm_zeroidle.c	21 Dec 2006 19:55:53 -0000
 @@ -155,6 +155,7 @@
   			wakeup_needed = TRUE;
   			msleep(&zero_state, &vm_page_queue_mtx,
   			    PDROP, "pgzero", hz * 300);
 +			vm_page_unlock_queues();
   		}
   	}
   }