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Re: cygwin-1.7.10-1 fork - address space needed by ... already in use
On Fri, Mar 09, 2012 at 10:48:30AM -0500, Christopher Faylor wrote:
>On Thu, Mar 08, 2012 at 10:55:35AM +0100, Corinna Vinschen wrote:
>>On Mar 8 09:50, Denis Excoffier wrote:
>>> On Wed, Mar 07, 2012 at 06:47:49PM +0100, Corinna Vinschen wrote:
>>> >> Hi Denis,
>>> >>
>>> >> can you please test this again using the latest developer snapshot or
>>> >> the current from CVS if you build Cygwin by yourself? It provides a bit
>>> >> more information to find the reason for the permission denied error in
>>> >> _pinfo::dup_proc_pipe.
>>> Thank you cgf (the committer and snapshot maker at least).
>>> >>
>>> >> In theory, the user should have permissions to duplicate handles into
>>> >> every own process, if the handle has been opened with these permissions,
>>> >> so it's quite interesting to find the reason.
>>> >>
>>>
>>> After about 3 hours of exercising the new snapshot (and shaking it a
>>> little), i met the "something failed" instance only twice:
>>>
>>> 1 [main] tcsh 7648! _pinfo::dup_proc_pipe: (child_info_spawn::worker) process synchronization failed for pid 7648/0x754, wr_proc_pipe 0x0 vs. 0x764: DuplicateHandle winerr 5, WFSO returned 258, Win32 error 5
>>> 503 [main] tcsh 6148! _pinfo::dup_proc_pipe: (child_info_spawn::worker) process synchronization failed for pid 6148/0x758, wr_proc_pipe 0x0 vs. 0x768: DuplicateHandle winerr 5, WFSO returned 258, Win32 error 5
>>>
>>> I continue, of course.
>>
>>Thanks, I don't think it's necessary to try further. What this shows is
>>that the process handle returned by the call to CreateProcess sometimes,
>>for some reason, does not allow handle duplication. That's weird.
>
>I have a vague idea about why this is happening. I'll look into it within
>the next 48 hours.
My vague idea about this proved to be incorrect. I did manage to make a
royal mess of the exec synchronization code before I figured that out
though so at least that's something.
Denis, did you see this while running the STC in
http://cygwin.com/ml/cygwin/2012-02/msg00187.html
?
Also, I checked back through the archives but didn't see any cygcheck
output from you. Maybe I just missed it but would you mind sending it
here?
To see if I could duplicate this, I created a STC which rapidly forked a
bunch of processes which also execed themselves. I could never get this
error to show up though.
cgf
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