[linux-cifs-client] recent regression in mainline CIFS code

[Shirish Pargaonkar]

On Wed, Apr 29, 2009 at 9:20 AM, Jeff Layton <jlayton at redhat.com> wrote:
> I've just started seeing a recent regression in the mainline cifs code
> when doing the general cthon04 tests. The small compile test does this:
>
> $ gcc -w -o stat stat.c -lm
> /usr/bin/ld: final link failed: Bad file descriptor
> collect2: ld returned 1 exit status
>
> Unix extensions are enabled here. I've not tested this w/o them yet.
> stracing shows this:
>
> 4866  open("stat", O_RDWR)              = 13
> 4866  fcntl(13, F_GETFD)                = 0
> 4866  fcntl(13, F_SETFD, FD_CLOEXEC)    = 0
> 4866  fstat(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> 4866  mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd4e7075000
> 4866  lseek(13, 0, SEEK_SET)            = 0
> 4866  read(13, 0x7fd4e7075000, 64)      = -1 EBADF (Bad file descriptor)
> 4866  lseek(13, 64, SEEK_CUR)           = 64
> 4866  write(13, "\6\0\0\0\5\0\0\0@\0\0\0\0\0\0\0@\0@\0\0\0\0\0@\0@\0\0\0\0\0\300"..., 448) = -1 EBADF (Bad file descriptor)
>
> I ran these tests a month or two ago and didn't see this, so I think
> it's a recent regression.
>
> --
> Jeff Layton <jlayton at redhat.com>
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>

Jeff,

A command like
 gcc -w -o /tmp/stat stat.c -lm
will work.

Just a suggestion during the effort of debugging this problem.  This
has something to do with the (default) mode
that is being used when a file is created (stat in this case).