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Date: Mon, 21 Feb 2005 18:50:40 +1000
From: Peter Grehan <grehan@freebsd.org>
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To: Garance A Drosihn <drosih@rpi.edu>
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Subject: Re: panic: mutex vm object not owned ...
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> panic: mutex vm object not owned at /usr/src/sys/vm/vm_page.c:608
  ...
> Tracing pid 7 tid 100026 td 0xf634960
> 0xd7cc1ac8: at panic+0x134
> 0xd7cc1b68: at _mtx_assert+0x74
> 0xd7cc1b88: at vm_page_remove+0x5c
> 0xd7cc1ba8: at vm_page_free_toq+0xcc
> 0xd7cc1bc8: at vm_page_free+0x28
> 0xd7cc1be8: at uma_small_free+0x60
> 0xd7cc1c18: at zone_drain+0x2e8
> 0xd7cc1c58: at zone_foreach+0x64
> 0xd7cc1c78: at uma_reclaim+0x20
> 0xd7cc1c98: at vm_pageout_scan+0x200
> 0xd7cc1d58: at vm_pageout+0x39c
> 0xd7cc1d98: at fork_exit+0x118
> 0xd7cc1dc8: at fork_trampoline+0xc

  Just saw on -current that this panic+bakctrace occurs on AMD64 as well 
so I'd say it's an MI problem.

     http://docs.freebsd.org/cgi/mid.cgi?1108935797.944.8.camel

later,

Peter.