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Date: Sat, 29 Aug 2009 23:45:22 +0200
From: Andreas Tobler <andreast-list@fgznet.ch>
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To: Kostik Belousov <kostikbel@gmail.com>
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Cc: freebsd-current <freebsd-current@freebsd.org>
Subject: Re: Boot panic -CURRENT #196643
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Kostik Belousov wrote:

> Please, try this.
> 
> diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c
> index 234cde9..b0e8d3c 100644
> --- a/sys/vm/vm_glue.c
> +++ b/sys/vm/vm_glue.c
> @@ -447,6 +447,8 @@ vm_thread_dispose(struct thread *td)
>  	pages = td->td_kstack_pages;
>  	ksobj = td->td_kstack_obj;
>  	ks = td->td_kstack;
> +	td->td_kstack = 0;
> +	td->td_kstack_pages = 0;
>  	if (pages == KSTACK_PAGES && kstacks <= kstack_cache_size) {
>  		ks_ce = (struct kstack_cache_entry *)ks;
>  		ks_ce->ksobj = ksobj;
> @@ -457,8 +459,6 @@ vm_thread_dispose(struct thread *td)
>  		return;
>  	}
>  	vm_thread_stack_dispose(ksobj, ks, pages);
> -	td->td_kstack = 0;
> -	td->td_kstack_pages = 0;
>  }
>  
>  static void

panic: Assertion td->td_lock == TDQ_LOCKPTR(tdq) failed ... sched_ule.c:1878
cpuid = 1
KDB: enter: panic
[thread pid 0 tid 100073 ]
Stopped at 	kdb_enter+0x3a: movl	$0,kdb_why

As you see I managed to reboot my zfs root ;)

Thanks,
Andreas