[U-Boot] ext4: crash when writing a file

[Stefan Bruens <stefan.bruens@rwth-aachen.de>]

On Dienstag, 29. November 2016 16:23:28 CET S?bastien Szymanski wrote:
> On 11/29/2016 03:38 PM, Br?ns, Stefan wrote:
> > On Dienstag, 29. November 2016 14:10:54 CET S?bastien Szymanski wrote:
> >>> Btw, which u-boot version are you using?
> >> 
> >> I first noticed the issue on U-Boot 2016.05 so I rebase on master from
> >> http://git.denx.de/u-boot.git
> >> 
> >> Regards,
> > 
> > That still doesn't make clear on which version you see this issue.
> > 2016.05?
> > Master? Which date/tag/hash?
> > 
> > U-Boot 2016.11 has received a huge number of fixes, and current master has
> > some more.
> 
> Sorry for being unclear.
> 
> I was working with U-Boot 2016.05 (commit
> aeaec0e682f45b9e0c62c522fafea353931f73ed) when I saw this issue. Then, I
> rebased on current master (commit
> e94793c844a40606252f2e3f6428063e057b3fd2) and I still see this issue.
> 
> I hope it's clearer now.
> 
> Regards,
> 
> > Regards,
> > 
> > Stefan
> 
> S?bastien Szymanski

So to restate what you are doing:

1. You have a partitioned MMC, where the 2nd partition starts at block 
264192/0x40800
2. You load a 93958144 byte (~90 MB) file via TFTP to ${loadaddr}
3. You write this partition image to 0x40800 using "mmc write"
4. You load another 5345128 byte (5 MB) file via TFTP to $loadaddr
5. You try to write this file to the 2nd partition, which now is ext4 
formatted, and already contains a file of the same name, i.e. boot/opos6ul-
linux.bin


Actually, I can't reproduce the crash. Maybe you have corrupted part of the 
memory when loading the image, e.g. overwritten part of u-boot or its heap.

Things you can try:
a) reboot the system after loading/writing the partion image.
b) checking the fs contents after the reboot, e.g "ls mmc 0:2 /boot" 
c) overwriting opos6ul-linux.bin with just a single byte, e.g "ext4write mmc 
0:2 0x0 /boot/opos6ul-linux.bin 1"
d) transferring back the partition image to your host and running fschk on it

You may also able to reproduce this using the u-boot sandbox.

Kind regards,

Stefan



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