8.0-RC2 on Rackmac3,1 - fatal kernel trap

[Nathan Whitehorn]

This is the middle of reading out the current MMU translations from Open 
Firmware (the OF_getprop() call at line 902 of mmu_oea64.c). It's 
possible the size of the translations buffer has been exceeded, and 
memory has been trashed, which would also explain why there is a 
difference between CD and netbooting. Peter, any ideas?
-Nathan

Jacob Lambert wrote:
> Here's a transcript with 'show registers' and 'bt' after trying to
> boot your 9.0-20091106-SNAP-powerpc-bootonly.iso.
>
> ---
> 0 > boot cd:,\boot\loader cd:0 load-size=3994c adler32=a40c7b0c
>
> Loading ELF
> Consoles: Open Firmware console
>
> FreeBSD/powerpc Open Firmware loader, Revision 0.1
> (root at elpis.tachypleus.net, Fri Nov  6 04:12:54 UTC 2009)
> Memory: 2097152KB
> Booted from: /ht/pci at 5/ata-6/disk at 0
>
> Loading /boot/defaults/loader.conf
> /boot/kernel/kernel data=0x72f8b0+0x199f98 syms=[0x4+0x5fad0+0x4+0x83f05]
> \
> Hit [Enter] to boot immediately, or any other key for command prompt.
> Booting [/boot/kernel/kernel] in 9 seconds...
>
> Type '?' for a list of commands, 'help' for more detailed help.
> OK boot
> Kernel entry at 0x100100 ...
> KDB: debugger backends: ddb
> KDB: current backend: ddb
>
> fatal kernel trap:
>
>    exception       = 0x7 (program)
>    srr0            = 0x0
>    srr1            = 0x83030
>    lr              = 0x582038
>    curthread       = 0
>
> [thread pid -1 tid 0 ]
> Stopped at      0:      illegal instruction 0
> db> show registers
> r0                   0
> r1            0x7e9e20  tmpstk+0x1e20
> r2                   0
> r3            0x829998  args.5817
> r4          0xff88ed18
> r5            0x829998  args.5817
> r6            0x9b60ac  translations
> r7               0x960  dsisize+0x8bc
> r8                 0x1
> r9                   0
> r10          0x1c32ce4
> r11                  0
> r12         0x24000028
> r13                  0
> r14                  0
> r15                  0
> r16                  0
> r17                  0
> r18                  0
> r19           0x100100  __start
> r20           0xeaf000
> r21                0x4
> r22          0x1c2e330
> r23           0x9c9848  end
> r24           0x100100  __start
> r25           0x9c5f54  mmu_kernel_obj
> r26              0x960  dsisize+0x8bc
> r27           0x9b60ac  translations
> r28           0x7e00d4
> r29         0xff88ed18
> r30             0x3030  dsisize+0x2f8c
> r31           0x7e9e20  tmpstk+0x1e20
> srr0                 0
> srr1           0x83030
> lr            0x582038  openfirmware+0x120
> ctr                  0
> cr          0x24000022
> xer                  0
> dar                  0
> dsisr                0
> 0:      illegal instruction 0
> db> bt
> Tracing pid -1 tid 0 td 0
> 0x007e9e80: at ofw_std_getprop+0x3c
> 0x007e9ea0: at OF_getprop+0x8c
> 0x007e9ed0: at moea64_bridge_bootstrap+0x5c8
> 0x007e9f90: at kernbase+0xfc
> db>
> ---
>
> On Fri, Nov 6, 2009 at 11:57 AM, Nathan Whitehorn
> <nwhitehorn at freebsd.org> wrote:
>   
>> Jacob Lambert wrote:
>>     
>>> All-righty, I've got three boot transcripts for you're viewing pleasure.
>>>
>>> First, I snagged a copy of 8.0-CURRENT-200906-powerpc-disc1.iso and
>>> burned it. I've removed the ATI video card so this is all done from
>>> the serial console with Open Firmware. Here's the transcript:
>>>
>>>       
>> [snip]
>>     
>>> Next, being a bored and curious sysadmin, I managed to find that you
>>> had just uploaded 9.0-20091106-SNAP-powerpc-bootonly.iso to your home
>>> folder on people.freebsd.org. I suppose it's premature for me to be
>>> fiddling with it but like I said, I'm bored. :) Here's the transcript:
>>>
>>>       
>> That is remarkably bored and curious: you beat my email to tell you about
>> it! I'd be very interested in the output of 'show registers' and also 'bt',
>> if the kernel is on the real stack yet.
>> -Nathan
>>
>>     
>
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