utmp handing (Was: [RFC][PATCH] Add support for oom_score_adj)

[Petr Lautrbach]

On 03/18/2011 11:09 PM, Scott James Remnant wrote:
> Cc'ing Petr
>
> On Thu, Mar 17, 2011 at 3:27 PM, Marc - A. Dahlhaus<mad at wol.de>  wrote:
>> Am 17.03.2011 21:45, schrieb Scott James Remnant:
>>
>>> On Thu, Mar 17, 2011 at 11:58 AM, Marc - A. Dahlhaus<mad at wol.de>  wrote:
>>>
>>>> BTW is the override file stuff upstreamed into the 1.X branch already?
>>>>
>>> No. I wanted to release a stable 1.0 with no new features, James
>>> needed to get features in for Ubuntu natty - so for now Ubuntu is
>>> running a fork of Upstart (whichout all the bug fixes of 1.0 + 1.1,
>>> but with new features).
>>
>> while we are at it, i had some problems regarding utmp handling in 1.0 and
>> while running a gdb session and talking with plauterbach on irc he suggested
>> adding this patch: http://plautrba.fedorapeople.org/upstart-utmp.patch
>>
>> The patch fixed the utmp handling on my box which is running an LFS based
>> system with unpatched upstream versions of glibc-2.13, util-linux-2.19
>> (agetty) and shadow-4.1.4.3 (login).

login from shadow-4.1.4.3 is the only difference I can see here. We use /bin/login from
util-linux in Fedora and as I've skim through sources, login from shadow packages handles
non-existing utmp entries slightly different. That's probably why there is no
opened record after first login.

>>
>> The problem was that upstart couldn't find the first opened utmp record on
>> logout from local ttys for each tty after a clean boot. The behavior was the
>> same even on a empty utmp file after a boot. SSH ttys where handled correctly
>> so a buggy glibc was ruled out in our tests.
>>
>> I didn't debugged it further after i found out that the patch mentioned above
>> fixed the bug for me.
>>


-- 
Petr Lautrbach, Red Hat, Inc.