https://bugzilla.novell.com/show_bug.cgi?id=623254
https://bugzilla.novell.com/show_bug.cgi?id=623254#c23
--- Comment #23 from Reinhard Max 2010-08-31 13:02:29 CEST ---
Indeed, this is a bug in gdm and separate from the XDMCP fix I put into the X
server code.
Sorry for the confusion.
I just tried it with a newly installed 11.3 plus all current updates.
* The X server (Xvnc or Xnest) correctly sends XDMCP query packets
to port 177.
* strace shows that gdm receives these packets seemingly comming
from a bogus IPv6 address (::ecb1:6ab7:2f5f:67b7) in my case.
* It then shows some activity including attempts to open /etc/gdm/Xwilling
which doesn't exist.
* It then tries to respond to the bogus address and of course gets
back error that the address it is unreachable.
As the other display managers can receive these packets, I think it is a
problem in gdm's XDMCP handling. The fact that I see the same bogus address
regardless whether the X server runs on the same or on a different machine
seems to indicate some memory corruption in the address handling of the receive
routine.
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