Ubuntu
linux package

  1. Bug #453579
  2. Comment #177

Comment 177 for bug 453579

Revision history for this message
Jakob Unterwurzacher (jakobunt) wrote : Re: [Bug 453579] Re: in-place corruption of large files *without fsck or reboot* reported with linux 2.6.31-14.46 on ext4

Am 2009-12-24 01:17, schrieb Goffi:
> By the way, I made a cmp of the qtmoko files, I have 2 bytes which
> differ:

Excellent! Scott, could you also post a cmp -l of a corrupted vs a good
file?

Now, let's have some binary... (Note that cmp -l output is octal)

% cmp -l qtmoko-debian-v15.jffs2.clean qtmoko-debian-v15.jffs2.old
16070033 64 164
16070039 257 255

064 = 00110100
164 = 01110100

257 = 10101111
255 = 10101101

% cmp -l qtmoko-debian-v15.jffs2.clean qtmoko-debian-v15.jffs2.old2
12701898 0 100
12701904 47 45

000 = 00000000
100 = 01000000

047 = 00100111
045 = 00100101

You have single bit flips on the second and on the seventh bit.
This looks so much like broken memory it virtually has to be broken memory.

OTOH, if everybody sees the second and the seventh bit flip then
probably ext4 is doing something very stupid. Again, please post your
cmp -l results!