[Pkg-openmpi-maintainers] Bug#584699: Bug#584699: programs freeze on first MPI op. when run on multihomed IPv6 hosts

[Ivan Shmakov]

>>>>> Manuel Prinz <manuel at debian.org> writes:

 > thanks for the report! I also took this upstream, but unfortunately
 > neither upstream nor I can reproduce the bug since we do not have
 > multi-homed IPv6 hosts available for testing. If you could help us
 > testing and/or provide us with further information this would be
 > really great! I CC'ed Jeff (upstream) since I'm not exactly sure what
 > he needs.

	When working with the package recently, I've stumbled upon what
	may be another manifestation of the same bug.  Now, I suspect
	that it's not IPv6 addresses by itself that trigger the problem,
	but rather the length of their respective string
	representations.  Actually, I guess that there's some static
	buffer involved, which is long enough to hold something like
	tcp://192.168.144.120:54321 (and tcp6://2002:bc87::1:54321), but
	truncates tcp6://2002:bc87:e7e5:2444:272:eff:fe0f:e02f:43210 at
	the 48'th character or so.

	Unfortunately, I was unable to find the relevant part of the
	code to check it myself.

	(Hopefully, I'd be able to gather some debugging output
	tomorrow.)

[…]

-- 
FSF associate member #7257
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