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Date: Tue, 02 Aug 2005 00:09:13 +1000
From: Peter Grehan <grehan@freebsd.org>
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To: Dario Freni <saturnero@freesbie.org>
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Cc: current@freebsd.org, fs@freebsd.org
Subject: Re: Rockridge extension not enabled when / is cd9660, boot fails
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> calltrap() at calltrap+0x5
> --- trap 0xc, eip = 0xc04fc828, esp = 0xc838bc84, ebp = 0xc838bca4 ---
> ata_pio_read(c1452578,800,129,c13e4200,c13f1c00) at ata_pio_read+0x78
> ata_end_transaction(c1452578) at ata_end_transaction+0x8b8
> ata_interrupt(c12ef600) at ata_interrupt+0xdf
> ithread_loop(c12fa800,c838bd38,c12fa800,c065ad88,0) at ithread_loop+0x11c
> fork_exit(c065ad88,c12fa800,c838bd38) at fork_exit+0xa0
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xc838bd6c, ebp = 0 ---
> panic: vm_fault: fault on nofault entry, addr: c708f000

  I suspect this is a bug somewhere in qemu - the ATA driver is getting 
a page fault in kernel mode while it is holding a lock, and the VM code 
then gets a LOR as it tries to determine if the fault is expected or not.

later,

Peter.