On Sat, Oct 01, 2011 at 10:01:35PM +0800, Dave Young wrote: > Hi, > > Weird problem, when I build app from source, > make; make install > run the command, but got "cannot execute binary file" > > hexdump shows the installed binary is full of zero > > Is it related to ext4 fiemap problem described below? > http://lwn.net/Articles/429349/ There is general agreement that /bin/cp should not have been relying on FIEMAP, and I believe the more recent versions of /bin/cp have removed that code by default pending implementation of SEEK_HOLE/SEEK_DATA. That being said, ext4 had a workaround to its FIEMAP implementation that landed in 2.6.39, and you're using 3.1.0-rc6. > I finally managed to find the way to reproduce this: > just cp a elf binary A to file B, then cp B to file C, then you will get: > A == B != C > > ie. > cp /bin/ls ls1 > cp ls1 ls2 > > ls2 will be filled with zero If you add a "sync" between the two copies, does that work around the problem? I bet it will... My suggestion is to upgrade to a newer version of coreutils that doesn't try to use FIEMAP. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
