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From: John Baldwin <jhb@freebsd.org>
To: freebsd-stable@freebsd.org
Subject: Re: Fwd: KASSERT in vm_map.c
Date: Thu, 6 Mar 2014 16:24:52 -0500
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 (bigwig.baldwin.cx); Thu, 06 Mar 2014 16:27:39 -0500 (EST)
Cc: Hans Petter Selasky <hps@bitfrost.no>
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On Thursday, March 06, 2014 2:07:45 am Hans Petter Selasky wrote:
> FYI
> 
> -------- Original Message --------
> Subject: KASSERT in vm_map.c
> Date: Thu, 27 Feb 2014 09:51:02 +0100
> From: Hans Petter Selasky <hps@bitfrost.no>
> To: Konstantin Belousov <kib@FreeBSD.org>
> 
> Hi,
> 
> Using 9-stable I hit a KASSERT when EHCI is loading:
> 
> --- a/sys/vm/vm_map.c
> +++ b/sys/vm/vm_map.c
> @@ -2301,9 +2301,11 @@ vm_map_unwire(vm_map_t map, vm_offset_t start,
> vm_offset_t end,
>                   * Mark the entry in case the map lock is released.  (See
>                   * above.)
>                   */
> +#if 0
>                  KASSERT((entry->eflags & MAP_ENTRY_IN_TRANSITION) == 0 &&
>                      entry->wiring_thread == NULL,
>                      ("owned map entry %p", entry));
> +#endif
>                  entry->eflags |= MAP_ENTRY_IN_TRANSITION;
>                  entry->wiring_thread = curthread;
>                  /*
> 
> 
> Is the KASSERT() wrong or is my USB code wrong.

The KASSERT is correct.  Can you provide more details from your panic?  (Do you have
a crash dump?)  It sounds like two threads are mucking with the same vm_map_entry at
the same time.

-- 
John Baldwin