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Date: Fri, 23 Dec 2011 00:07:56 +1100
From: Shaddy Baddah <lithium-cygwin AT shaddybaddah DOT name>
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Subject: Re: [ANNOUNCEMENT] CALL FOR TESTING: Cygwin 1.7.10
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Hi Corinna,

On 22/12/11 22:19, Corinna Vinschen wrote:
> On Dec 22 22:11, Shaddy Baddah wrote:
>> On 22/12/11 21:44, Corinna Vinschen wrote:
>>> Does it really work if you replace the DLL with 1.7.9 again?  If so,
>>> you could try to find out which snapshot introduced the problem for you.
>>>
>>> Also, you could start the whole thing from strace to see what happens:
>>>
>>>   CMD> strace -o my.trace sh -c "/bin/id -a"
>>
>> I've done this with 1.7.10 still in place, once with portapps user
>> (the failure case), and with my own regular (domain) user. Comparing
>> the two outputs, there is an obvious ERROR_ACCESS_DENIED error in the
>> failure case:
>>
>>    69  126706 [main] sh 3824 build_env: envp 0x61266AB4, envc 47
>>    37  126743 [main] sh 3824 child_info::child_info: subproc_ready 0x234
>>   589  127332 [main] sh 3824 seterrno_from_win_error:
>> /netrel/src/cygwin-snapshot-20111219-1/winsup/cygwin/spawn.cc:692
>> windows error 5
>>    59  127391 [main] sh 3824 geterrno_from_win_error: windows error 5 ==
>> errno 13
>>    74  127465 [main] sh 3824 child_info_spawn::worker: CreateProcess
>> failed, Win32 error 5
>>   196  127661 [main] sh 3824 stat64: entering
>>
>> Any further hints?
>
> Well, CreateProcess fails with "access denied".  There must be a reason
> for that, but I don't know what it is and I don't know what to look for.
> Try bisecting the snapshots.
>
Sorry, it was always my intention to try the snapshots. I have got the
domestic duties out of the way now, and managed to determine the last
known good snapshot as the one listed as 2011-12-07 03:13:28 UTC. The
next one, the first known bad one is listed as 2011-12-08 06:55:55
UTC.

In between these there was a check-in of spawn.cc, if that is indeed
the culprit:

Revision 1.317, Wed Dec 7 10:48:17 2011 UTC (2 weeks, 1 day ago) by corinna
Branch: MAIN
CVS Tags: HEAD
Changes since 1.316: +11 -1 lines

    * spawn.cc (child_info_spawn::worker): Add CREATE_BREAKAWAY_FROM_JOB
    to all spawned processes.  Explain why.

http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/cygwin/spawn.cc.diff?r1=1.316&r2=1.317&cvsroot=src

Looks rather innocuous, so don't understand why it is causing me
problems.

Thanks,
Shaddy


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