Re: cygwin-1.7.10-1 fork - address space needed by ... already in use

[Denis Excoffier <cygwin at Denis-Excoffier dot org>]

On Tue, Feb 07, 2012 at 07:00:25AM -0800, Scott M. Ballew wrote:
>> 
>> I've got a Windows XP SP3 (32-bit) system that I just upgraded from Cygwin
>> 1.5 to Cygwin 1.7 as a clean install (deinstalled all old Cygwin, scrubbed
>> the registry, cleared environment variables, etc.) Mostly, it seems to work,
>> but I've got a shell script that runs several rsync's for me that does not
>> work right. Some of the rsync's run correctly, and others give me:
>> 
>> hostname1: updating host hostname1
>>       3 [main] rsync 3112 child_info_fork::abort: address space needed by
>> 'cygiconv-2.dll' (0x674C0000) is already occupied
>>       3 [main] rsync 3112 child_info_fork::abort: address space needed by
>> 'cygiconv-2.dll' (0x674C0000) is already occupied
>> rsync: fork: Resource temporarily unavailable (11)
>> rsync error: error in IPC code (code 14) at
>> /home/lapo/package/rsync-3.0.9-1/src/rsync-3.0.9/pipe.c(63) [sender=3.0.9]
>> hostname1: updating of hostname1 finished
I've the same system same problem. I usually do a fresh install every 4 or 6
months. I cannot tell that cygiconv-2.dll is the only one that triggers this, but
recently (15 days) yes (in older times, cyggcc_s-1.dll was also often in the message).
But the process in cause varies: sh, tcsh, gcc-4 etc. rsync i don't think so.
>> 
>> I've tried "rebaseall", and that only moved the address reported for
>> cygiconv-2.dll. Even tried "rebaseall -b 0x68000000" and "rebaseall -b
>> 0x78000000". Again, the only effect was to change the address where
>> cygiconv-2.dll wants to load.
Me too. Exactly the same.

I've also instrumented cygwin1.dll as suggested recently to Heiko Elger
in http://cygwin.com/ml/cygwin/2012-02/msg00092.html
(note that he was also talking cygiconv-2.dll) and i installed Sleep(3600000L)
(1 hour) to have plenty of time. Observations are:
- now that i expect fork failures, they seem to appear less often...
- the launching of my X session (xinit) is blocked by a 2nd XWin.exe that presumably
  now waits 1hour to die, if i kill it directly from TaskManager, all is fine,
  but this is another subject...
- the /proc/<pid>/maps of the processes involved in the fork failure look normal:
...
61262000-61470000 rw-p 00262000 C095:C492 13792273859134500   /usr/bin/cygwin1.dll
674C0000-674C1000 r--p 00000000 C095:C492 2251799814315820    /usr/bin/cygiconv-2.dll
674C1000-674D8000 r-xp 00001000 C095:C492 2251799814315820    /usr/bin/cygiconv-2.dll
674D8000-675B8000 rw-p 00018000 C095:C492 2251799814315820    /usr/bin/cygiconv-2.dll
675B8000-675B9000 r--p 000F8000 C095:C492 2251799814315820    /usr/bin/cygiconv-2.dll
675B9000-675BB000 rw-p 000F9000 C095:C492 2251799814315820    /usr/bin/cygiconv-2.dll
675BB000-675BC000 r--p 000FB000 C095:C492 2251799814315820    /usr/bin/cygiconv-2.dll
6AFC0000-6AFC1000 r--p 00000000 C095:C492 1407374884189126    /usr/bin/cygreadline7.dll
...

Now looking into dll_init.cc, i'm probably going to try the following: if
VirtualAlloc (line 429, just before 'already occupied') fails, try it
once more after waiting, say 100ms. Any comments?

Regards,

Denis Excoffier.

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