nis + dnslookup => glibc crash

[Jon Ciesla]

> Jon Ciesla wrote:
>>> I haven't dug very deep but I am getting crashes in all applications
>>> that
>>> do dns
>>> lookups while ypbind is running. The backtraces point the crash
>>> somewhere
>>> in glibc.
>>> This happens when hosts in nsswitch is set to look at nis before
>>> looking
>>> up dns
>>> "hosts:      files nis dns".
>>>
>>> If I reorder the line to look up dns before nis them it works fine as
>>> nis
>>> is
>>> never accessed. Also shutting down ypbind also makes the crashes stop.
>>>
>>> I can get more info tomorrow morning (GMT). (Unfortunately I can't log
>>> into that
>>> machine from home now as I screwed something up)
>>
>> Is your machine that's running ypserv set to provide host information?
>
> That is an interesting point which I can answer tomorrow. All I know is
> the nis
> hosts are some very old sun servers. But even if it didn't then it should
> just
> drop though to dns and certainly not cause a crash in a user level app. It
> wasn't an issue in previous versions.

You'd think, but it could be either a glibc issue or something in how the
NIS server responds.  I use NIS, but not for host info and I'll be curious
to see what happens when I upgrade to F-10 in the near future.

> Btw the apps which crashed were yum, pidgin, firefox and thunderbird. I
> can try
> some more out but I think it is pretty generic.

It likely is.

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