On Mon, Aug 20, 2007 at 03:24:05PM +0200, Holger Weiss wrote:
> I should've mentioned that PPPOEGETSESSION evaluates to 3223349616 on
> _both_ sides.  That is, replacing the PPPOEGETSESSION macro with the
> hardcoded value 3223349616UL within both the ioctl(2) call and
> pppoe_ioctl()'s switch case doesn't change anything.

What does ktrace say?

  4883      1 pppoectl CALL  ioctl(3,PPPOEGETSESSION,0xffffffffffffc694)
  4883      1 pppoectl GIO   fd 3 wrote 32 bytes
       "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
  4883      1 pppoectl GIO   fd 3 read 32 bytes
       "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\^C\0\0\v\M-W\0\0\0\^U\0\0\0\0"
  4883      1 pppoectl RET   ioctl 0, 3223349616/0xc0206970

is what I get. Corresponding kdump -n:

  4883      1 pppoectl CALL  ioctl(3,0xc0206970,0xffffffffffffc694)
  4883      1 pppoectl GIO   fd 3 wrote 32 bytes
       "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
  4883      1 pppoectl GIO   fd 3 read 32 bytes
       "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\^C\0\0\v\M-W\0\0\0\^U\0\0\0\0"
  4883      1 pppoectl RET   ioctl 0, 0xc0206970


Martin