* rxvt loses output connection with non cygwin console processes @ 2012-05-15 16:59 Pawel Jasinski 2012-05-15 17:26 ` James Johnston 2012-05-16 1:59 ` Christopher Faylor 0 siblings, 2 replies; 7+ messages in thread From: Pawel Jasinski @ 2012-05-15 16:59 UTC (permalink / raw) To: cygwin hi, i have discovered something peculiar. I run my rxvt with the usual: C:\cygwin\bin\rxvt.exe -bg wheat -fg black -sl 5000 -e /bin/bash -ls now I try inside to run some *non* cygwin console program rxvt shows nothing, and reports 30% cpu consumption The actual program is executed, completes and control comes back to bash, but the output is not there. I can issue blindly other commands and see them in process list (e.g. ls -lR /) I can also terminate the session with Ctrl-D or exit As long as rxvt is running procexplorer reports 30% cpu usage. This started to happen today after I did update (setup.exe) The cygwin.dll version is 1.7.15-1 Now if I roll back cygwin.dll to 1.7.14-2 problem is gone. The programs which triggers the problem are .net console applications (2.0 or 4.0). All cygwin binaries + java.exe work ok. The trigger program runs ok in cmd.exe with bash. And as a bonus, mintty has also similar problem. Cpu doesn't go as high and input channel with bash is lost. --pawel -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: rxvt loses output connection with non cygwin console processes 2012-05-15 16:59 rxvt loses output connection with non cygwin console processes Pawel Jasinski @ 2012-05-15 17:26 ` James Johnston 2012-05-15 17:30 ` James Johnston 2012-05-16 1:59 ` Christopher Faylor 1 sibling, 1 reply; 7+ messages in thread From: James Johnston @ 2012-05-15 17:26 UTC (permalink / raw) To: cygwin I can reproduce this, although I did not try rolling back my Cygwin version. The issue seems specific to .NET programs because they always do null writes. However the following straight Win32 program written in C will also reproduce the problem (basically the same program I've sent earlier on this mailing list). So it is not specific to .NET. #include <windows.h> int main() { char * test = "Hello world!\n"; DWORD written; HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE); Sleep(1000); WriteFile(h, test, 0, &written, NULL); /* causes problems */ Sleep(1000); WriteFile(h, test, lstrlenA(test), &written, NULL); return 0; } As the OP notes, I also only have this problem when running the test program from a "GUI" terminal. It seems that any program doing a null write to standard output (and probably standard error?) will trigger the problem. From Windows command prompt / standard Windows console window: Running Cygwin.bat to start Cygwin and then running ./Test.exe works fine. From mintty.exe: Running ./Test.exe causes bash to hang. Test.exe runs to completion and terminates, but bash doesn't get the hint. CPU usage is at 0%. If I use Windows Task Manager to kill bash.exe, then mintty.exe correctly terminates. From rxvt.exe: Running ./Test.exe causes bash to hang like with mintty. Test.exe runs to completion and terminates but bash is hung. For some reason, a thread in rxvt spins in an infinite loop, sucking 100% of a single CPU core. The hung bash.exe doesn't use any CPU. If I use Windows Task Manager to kill bash.exe, then rxvt.exe correctly exits its loop and terminates. > i have discovered something peculiar. > I run my rxvt with the usual: > > C:\cygwin\bin\rxvt.exe -bg wheat -fg black -sl 5000 -e /bin/bash -ls > > now I try inside to run some *non* cygwin console program rxvt shows > nothing, and reports 30% cpu consumption > > The actual program is executed, completes and control comes back to bash, > but the output is not there. > I can issue blindly other commands and see them in process list (e.g. ls -lR /) I > can also terminate the session with Ctrl-D or exit As long as rxvt is running > procexplorer reports 30% cpu usage. > > This started to happen today after I did update (setup.exe) The cygwin.dll > version is 1.7.15-1 Now if I roll back cygwin.dll to 1.7.14-2 problem is gone. > > The programs which triggers the problem are .net console applications > (2.0 or 4.0). > All cygwin binaries + java.exe work ok. > > The trigger program runs ok in cmd.exe with bash. > And as a bonus, mintty has also similar problem. Cpu doesn't go as high and > input channel with bash is lost. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: rxvt loses output connection with non cygwin console processes 2012-05-15 17:26 ` James Johnston @ 2012-05-15 17:30 ` James Johnston 0 siblings, 0 replies; 7+ messages in thread From: James Johnston @ 2012-05-15 17:30 UTC (permalink / raw) To: cygwin I apologize, I forgot to mention that I tried both with and without the new "pipe_byte" CYGWIN option. It made no difference. To OP: you'll definitely want to look into using the new "pipe_byte" option since you are working with non-Cygwin processes. See the thread I started late last month titled "Cygwin passes through null writes to other software when redirecting standard input/output". If you redirect standard input for a non-Cygwin program, you'll be affected. > As the OP notes, I also only have this problem when running the test > program from a "GUI" terminal. It seems that any program doing a null write > to standard output (and probably standard error?) will trigger the problem. > > From Windows command prompt / standard Windows console window: > Running Cygwin.bat to start Cygwin and then running ./Test.exe works fine. > > From mintty.exe: Running ./Test.exe causes bash to hang. Test.exe runs to > completion and terminates, but bash doesn't get the hint. CPU usage is at > 0%. If I use Windows Task Manager to kill bash.exe, then mintty.exe > correctly terminates. > > From rxvt.exe: Running ./Test.exe causes bash to hang like with mintty. > Test.exe runs to completion and terminates but bash is hung. For some > reason, a thread in rxvt spins in an infinite loop, sucking 100% of a single CPU > core. The hung bash.exe doesn't use any CPU. If I use Windows Task > Manager to kill bash.exe, then rxvt.exe correctly exits its loop and > terminates. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: rxvt loses output connection with non cygwin console processes 2012-05-15 16:59 rxvt loses output connection with non cygwin console processes Pawel Jasinski 2012-05-15 17:26 ` James Johnston @ 2012-05-16 1:59 ` Christopher Faylor 2012-05-16 10:58 ` Ken Brown 2012-05-16 16:15 ` James Johnston 1 sibling, 2 replies; 7+ messages in thread From: Christopher Faylor @ 2012-05-16 1:59 UTC (permalink / raw) To: cygwin On Tue, May 15, 2012 at 06:59:14PM +0200, Pawel Jasinski wrote: >i have discovered something peculiar. >I run my rxvt with the usual: > >C:\cygwin\bin\rxvt.exe -bg wheat -fg black -sl 5000 -e /bin/bash -ls > >now I try inside to run some *non* cygwin console program >rxvt shows nothing, and reports 30% cpu consumption This problem should be fixed in the next snapshot. Ken Brown, if you're reading this, would you mind confirming that the problem with emacs and gdb -mi that I recently fixed is has not been resurrected? (If you're not reading this then I'd still appreciate confirmation) cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: rxvt loses output connection with non cygwin console processes 2012-05-16 1:59 ` Christopher Faylor @ 2012-05-16 10:58 ` Ken Brown 2012-05-16 14:10 ` Christopher Faylor 2012-05-16 16:15 ` James Johnston 1 sibling, 1 reply; 7+ messages in thread From: Ken Brown @ 2012-05-16 10:58 UTC (permalink / raw) To: cygwin On 5/15/2012 9:59 PM, Christopher Faylor wrote: > On Tue, May 15, 2012 at 06:59:14PM +0200, Pawel Jasinski wrote: >> i have discovered something peculiar. >> I run my rxvt with the usual: >> >> C:\cygwin\bin\rxvt.exe -bg wheat -fg black -sl 5000 -e /bin/bash -ls >> >> now I try inside to run some *non* cygwin console program >> rxvt shows nothing, and reports 30% cpu consumption > > This problem should be fixed in the next snapshot. > > Ken Brown, if you're reading this, would you mind confirming that the > problem with emacs and gdb -mi that I recently fixed is has not been > resurrected? It's still fixed. Ken -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: rxvt loses output connection with non cygwin console processes 2012-05-16 10:58 ` Ken Brown @ 2012-05-16 14:10 ` Christopher Faylor 0 siblings, 0 replies; 7+ messages in thread From: Christopher Faylor @ 2012-05-16 14:10 UTC (permalink / raw) To: cygwin On Wed, May 16, 2012 at 06:57:55AM -0400, Ken Brown wrote: >On 5/15/2012 9:59 PM, Christopher Faylor wrote: >> On Tue, May 15, 2012 at 06:59:14PM +0200, Pawel Jasinski wrote: >>> i have discovered something peculiar. >>> I run my rxvt with the usual: >>> >>> C:\cygwin\bin\rxvt.exe -bg wheat -fg black -sl 5000 -e /bin/bash -ls >>> >>> now I try inside to run some *non* cygwin console program >>> rxvt shows nothing, and reports 30% cpu consumption >> >> This problem should be fixed in the next snapshot. >> >> Ken Brown, if you're reading this, would you mind confirming that the >> problem with emacs and gdb -mi that I recently fixed has not been >> resurrected? > >It's still fixed. Thank you for confirming. cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: rxvt loses output connection with non cygwin console processes 2012-05-16 1:59 ` Christopher Faylor 2012-05-16 10:58 ` Ken Brown @ 2012-05-16 16:15 ` James Johnston 1 sibling, 0 replies; 7+ messages in thread From: James Johnston @ 2012-05-16 16:15 UTC (permalink / raw) To: cygwin > On Tue, May 15, 2012 at 06:59:14PM +0200, Pawel Jasinski wrote: > >i have discovered something peculiar. > >I run my rxvt with the usual: > > > >C:\cygwin\bin\rxvt.exe -bg wheat -fg black -sl 5000 -e /bin/bash -ls > > > >now I try inside to run some *non* cygwin console program rxvt shows > >nothing, and reports 30% cpu consumption > > This problem should be fixed in the next snapshot. Confirmed fixed with both my C test program and a .NET program too. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-05-16 16:15 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-05-15 16:59 rxvt loses output connection with non cygwin console processes Pawel Jasinski 2012-05-15 17:26 ` James Johnston 2012-05-15 17:30 ` James Johnston 2012-05-16 1:59 ` Christopher Faylor 2012-05-16 10:58 ` Ken Brown 2012-05-16 14:10 ` Christopher Faylor 2012-05-16 16:15 ` James Johnston
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