Re: [uml-devel] difference of a shell script versus command line WRT "winch_thread : TIOCSCTTY failed on fd 1 err = 1"

[Richard Weinberger <richard@nod.at>]

Am 22.09.2013 11:20, schrieb Toralf Förster:
> On 09/22/2013 10:27 AM, Toralf Förster wrote:
>> On 09/22/2013 08:52 AM, richard -rw- weinberger wrote:
>>> On Mon, Sep 16, 2013 at 10:04 PM, Toralf Förster <toralf.foerster@gmx.de> wrote:
>>>> If I run the following script
>>>>
>>>> $> cat l.sh
>>>> #!/bin/sh
>>>> #
>>>>
>>>> /usr/local/bin/linux-v3.11-8718-g0fb5ca1 earlyprintk ubda=/home/tfoerste/virtual/uml/n22unst4 ubdb=/mnt/ramdisk/n22unst4_swap eth0=tuntap,tap2,72:ef:3d:5d:d3:db mem=1025M con0=fd:0,fd:1 con=pts umid=uml_n22unst4 rootfstype=ext4
>>>>
>>>>
>>>> then during start of the UML I get
>>>>
>>>> ...
>>>> Netdevice 0 (72:ef:3d:5d:d3:db) :
>>>> TUN/TAP backend -
>>>> winch_thread : TIOCSCTTY failed on fd 1 err = 1
>>>
>>> Hmm, that's a regression introduced by:
>>> commit 250127216dd6635f5730752d7444bdec992aecb0
>>> Author: Richard Weinberger <richard@nod.at>
>>> Date:   Sun Aug 18 13:30:09 2013 +0200
>>>
>>>     um: Run UML in it's own session.
>>>
>>>     If UML is not run by a shell it can happen that UML
>>>     will kill unrelated proceses upon a fatal exit because
>>>     it issues a kill(0, ...).
>>>     To prevent such oddities we create a new session in main().
>>>
>>>     Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com>
>>>     Signed-off-by: Richard Weinberger <richard@nod.at>
>>>
>>>
>>> The winch-thread also has it's own session, this seems to be to an issue.
>>>
>>
>> sure - I can reproduce it with linux-v3.11-8718-g0fb5ca1 , which doesn't contain that commit, or ?
>>
> I'd like to bisect iit,k but as soon as I run something like
> $> ./l.sh | tee >logfile>
> then the issue vanishes - so I can see it on the command line.
> Furthermore I know, that it is not in 3.10.0-08763-g7d3107d, but in
> v3.12-rc1-42-gf42bcf1 - but without automation bisecting is not funny.

Why bisect? Commit 2501272 is the evildoer.
Now I have to find a sane way to fix the kill(0,...) issue without breaking the winch-thread.

Thanks,
//richard

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