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From: Sean Bruno <seanbru@yahoo-inc.com>
To: John Baldwin <jhb@freebsd.org>
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Date: Wed, 01 Aug 2012 15:48:48 -0700
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Cc: "attilio@freebsd.org" <attilio@freebsd.org>,
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Subject: Re: [stable 9] panic on reboot: ipmi_wd_event()
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On Wed, 2012-08-01 at 05:53 -0700, John Baldwin wrote:
> Index: vfs_subr.c
> ===================================================================
> --- vfs_subr.c  (revision 238969)
> +++ vfs_subr.c  (working copy)
> @@ -1868,8 +1868,11 @@ sched_sync(void)
>                                 continue;
>                         }
>  
> -                       if (first_printf == 0)
> +                       if (first_printf == 0) {
> +                               mtx_unlock(&sync_mtx);
>                                 wdog_kern_pat(WD_LASTVAL);
> +                               mtx_lock(&sync_mtx);
> +                       }
>  
>                 }
>                 if (!LIST_EMPTY(gslp)) {
> 
> 
> -- 
> John Baldwin 

This definitely makes the panic go away on reboot.

Sean