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    Subject[BUG] copy file result with zero
    From
    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/

    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

    Below is a strace log of install, kernel version is 3.1.0-rc6+
    geteuid() = 0
    umask(0) = 022
    stat("/tmp/vpnc", 0x7fff85363710) = -1 ENOENT (No such file or directory)
    stat("vpnc", {st_mode=S_IFREG|0755, st_size=368662, ...}) = 0
    lstat("/tmp/vpnc", 0x7fff85363250) = -1 ENOENT (No such file or directory)
    open("vpnc", O_RDONLY) = 3
    fstat(3, {st_mode=S_IFREG|0755, st_size=368662, ...}) = 0
    open("/tmp/vpnc", O_WRONLY|O_CREAT|O_EXCL, 0755) = 4
    fstat(4, {st_mode=S_IFREG|0755, st_size=0, ...}) = 0
    uname({sys="Linux", node="darkstar", ...}) = 0
    ioctl(3, FS_IOC_FIEMAP, 0x7fff85361f60) = 0
    ftruncate(4, 368662) = 0
    fsetxattr(4, "system.posix_acl_access",
    "\x02\x00\x00\x00\x01\x00\x06\x00\xff\xff\xff\xff\x04\x00\x00\x00\xff\xff\xff\xff
    \x00\x00\x00\xff\xff\xff\xff", 28, 0) = 0
    close(4) = 0
    close(3) = 0
    chmod("/tmp/vpnc", 0755) = 0
    close(0) = 0
    close(1) = 0
    close(2) = 0
    exit_group(0) = ?
    --
    Regards
    Dave


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