Re: Xfs Access to block zero exception and system crash

[Dave Chinner <david@fromorbit.com>]

On Fri, Jul 04, 2008 at 10:51:47AM -0700, Sagar Borikar wrote:
> 
> Copy is of the same file to 30 different directories and it is basically
> overwrite.

Not an overwrite - cp truncates the destination file first:

# cp t.t fred
# strace cp -f t.t fred
.....
stat("fred", {st_mode=S_IFREG|0644, st_size=5, ...}) = 0
stat("t.t", {st_mode=S_IFREG|0644, st_size=5, ...}) = 0
stat("fred", {st_mode=S_IFREG|0644, st_size=5, ...}) = 0
open("t.t", O_RDONLY)                   = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=5, ...}) = 0
open("fred", O_WRONLY|O_TRUNC)          = 4
             ^^^^^^^^^^^^^^^^
fstat(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
read(3, "fred\n", 4096)                 = 5
write(4, "fred\n", 5)                   = 5
close(4)                                = 0
close(3)                                = 0
.....


That being said, I can't reproduce it on a 2.6.24 (debian)
kernel, either.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com