Rockridge extension not enabled when / is cd9660, boot fails

Dario Freni saturnero at
Mon Aug 1 10:33:24 GMT 2005

Dario Freni wrote:
> Peter Grehan wrote:
>>Hi Dario,
>> I've come across this too: a hack is at:
>> ... though I think that's the wrong way to do it.
>> I guess you and I are the only ones to ever mount cd9660 as root :)
> I guess it too :) Thank you very much for the patch. Can't be it
> commited? Or can't this problem be fixed on the source tree in some way?
>  I think the cd9660 root "feature" is quite unusable this way.

The patched worked for me in a normal environment. I'm getting a LOR
under qemu:

acd0: CDROM <QEMU CD-ROM/0.7.0> at ata1-master PIO3
ATA PseudoRAID loaded
GEOM_LABEL: Label for provider acd0 is iso9660/FreeSBIE.
Trying to mount root from cd9660:/dev/iso9660/FreeSBIE
lock order reversal
 1st 0xc12ef6e8 ATA state lock (ATA state lock) @
 2nd 0xc10611c4 user map (user map) @ /usr/src/sys/vm/vm_map.c:2997
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c0985108,c0985cc0,c090d5ec) at kdb_backtrace+0x29
witness_checkorder(c10611c4,9,c08c1360,bb5) at witness_checkorder+0x564
_sx_xlock(c10611c4,c08c1360,bb5) at _sx_xlock+0x50
_vm_map_lock_read(c1061180,c08c1360,bb5,2009b2b,c) at _vm_map_lock_read+0x37
vm_map_lookup(c838bb7c,c708f000,2,c838bb80,c838bb70) at vm_map_lookup+0x28
vm_fault(c1061000,c708f000,2,0,c132b300) at vm_fault+0x66
trap_pfault(c838bc44,0,c708f800) at trap_pfault+0x137
trap(8,28,28,c708f800,c12ef600) at trap+0x341
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
cpuid = 0
KDB: enter: panic
[thread pid 26 tid 100026 ]
Stopped at      kdb_enter+0x2b: nop

Dario Freni (saturnero at
FreeSBIE developer (
GPG Public key at

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