iPod 4th gen ramdisk crashes

[GoogleCodeExporter]

What steps will reproduce the problem?
1. A 16 GB iPod 4th gen device running iOS 6.1.3, model ME179LL/A
2. A 5.1.1 iOS image, patched and booted using redsn0w/DFU
3. Device boots, and a split second after the OK ASCII, I see what appears to 
be a stack trace, the device goes white, and then reboots.

What is the expected output? What do you see instead?
The expected output would be the device awaiting an SSH connection.  The actual 
output is a stack trace and a reboot.

What version of the product are you using? On what operating system?
OS X version : 10.8.3
XCode version : 4.6.2
Tools revision : d67884c68fec+ tip

Please provide any additional information below.
I've had no problems with 4th generation iPod Touch 8 GB devices.  For some 
reason, this 16 GB device panics shortly after booting the ramdisk.  I have 
tried to patch 5.0, 5.0.1, and 5.1.1 IPSW images.  I've tried using 4.2, 5.0 
and 5.1 SDKs.  I'm getting the same result in most cases.

Any ideas or anything I can do to help troubleshoot this?  The stack trace 
scrolls by so quickly that I can't really read what it says.

Original issue reported on code.google.com by murdo...@gmail.com on 27 May 2013 at 6:02

[GoogleCodeExporter]

try updating to the latest revision (hg pull -u, then rebuild the ramdisk), 
there is one commit ahead of your version that could resolve the issue.
if the panic still occurs, remove this line in build_ramdisk.sh
cp ramdisk_tools/ioflashstoragekit /Volumes/ramdisk/var/root
then rebuild the ramdisk and see if it still crashes (if it doesnt crash then 
ios_examiner wont work, but ssh should work).
thanks.

Original comment by jean.sig...@gmail.com on 27 May 2013 at 4:05

• Changed state: Accepted

[GoogleCodeExporter]

Jean,

Thank you for your quick response.  The newest source did not seem to solve my 
problem, but removing ioflashstoragekit did.  My goal is to get an image of the 
NAND storage, so I believe my goal can still be reached without that.

If there's anything else you'd like me to try now or in the future just let me 
know.  I can test any updates on this device and let you know the results.

One thing that I thought was a little strange - I expected there to be an 
encrypted backup password (set through iTunes) in the iPhone keychain, but it 
was not revealed by keychain_tool.py.  Maybe my assumption that it was set was 
incorrect.

Original comment by murdo...@gmail.com on 27 May 2013 at 5:10

[GoogleCodeExporter]

you need ioflashstoragekit to dump the NAND.
can you try the attached patch to see if the crash still occurs ? you'll have 
to undo the previous modification in build_ramdisk.sh and then rebuild the 
ramdisk.
for the backup password maybe it was once set but then removed ?
thanks.

Original comment by jean.sig...@gmail.com on 28 May 2013 at 5:14

Attachments:

• ipt4_nand_debug.patch

[GoogleCodeExporter]

That did seem to work.  I uncommented:

cp ramdisk_tools/ioflashstoragekit /Volumes/ramdisk/var/root

I applied the patch ("patch -p1 < ipt4_nand_debug.patch" from the 
iphone-dataprotection directory).

I then ran a "make clean" in the ramdisk_tools directory and went back through 
the sequence with the kernel_patcher.py and "sh ./make_ramdisk_n81ap.sh"

The iPod 16GB now boots and does not crash after the OK ASCII display.

Original comment by murdo...@gmail.com on 30 May 2013 at 1:51

[GoogleCodeExporter]

closing old issues

Original comment by jean.sig...@gmail.com on 11 Feb 2014 at 10:38

• Changed state: Done