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| Date: | Thu, 28 May 2015 20:14:04 +0200 |
| From: | Johannes Schindelin <johannes DOT schindelin AT gmx DOT de> |
| To: | cygwin AT cygwin DOT com, Johannes Schindelin <johannes DOT schindelin AT gmx DOT de>, |
| Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp> | |
| Cc: | Corinna Vinschen <corinna-cygwin AT cygwin DOT com> |
| Subject: | Re: Regression on XP with "Fix OPOST for non-Cygwin pty slaves" |
| In-Reply-To: | <20150527125011.GI16927@calimero.vinschen.de> |
| References: | <a36a28acdd2deef74569904ab0601c0f AT www DOT dscho DOT org> <20150527125011 DOT GI16927 AT calimero DOT vinschen DOT de> |
| Message-ID: | <614c10d95cd4b6ebae80744837770090@www.dscho.org> |
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Hi Corrinna, On 2015-05-27 14:50, Corinna Vinschen wrote: > On May 1 16:25, Johannes Schindelin wrote: >> Hi Yano & Corinna, >> >> I would like to ask you for help with fixing a regression I am >> experiencing >> on XP (and XP only, the problem does not occur with Windows 7 or 8). >> It may >> be a 32-bit issue, but I cannot currently test on 64-bit XP. >> >> Background: I am the maintainer of Git for Windows and we are hoping >> to >> release a new major release Real Soon Now, based on MSys2 (which in >> turn is >> based on Cygwin). To make the user experience a bit better, we want to >> allow >> users to double-click a "Git Bash" icon that simply launches a small, >> non-console MinGW executable which in turn basically sets up the PATH >> and >> MSYSTEM environment variables (as required for the MSys2 runtime) and >> then >> launches a mintty with a bash inside. Please note that this small >> executable >> is *not* a console program but a GUI one (-mwindows instead of >> -mconsole) so >> that no console window flashes before the mintty window is shown. >> >> Now, this strategy worked well so far, except that I recently found >> that Git >> Bash does not start in XP anymore, instead the mintty process just >> sits and >> waits for a while and after five to ten minutes, the mintty window >> appears >> with the message: >> >> Failed to fork child process: Resource temporarily unavailable. >> DLL rebasing may be required. See 'rebaseall --help'. >> >> (Needless to say, a 'rebaseall' does not fix it.) >> >> This problem does *not* occur if I call mintty from a `.bat` file or >> from >> `cmd` -- but as I said, I want to avoid flashing console windows -- >> and it >> also does not happen if I run a mintty from a freshly installed Cygwin >> (with >> cygwin package version 2.0.1-1) where the shortcut points directly to >> `mintty` which is a console application. >> >> This symptom makes me believe that the culprit might be that >> msys-2.0.dll >> somehow expected an attached Win32 Console, and spins in circles when >> there >> is none. >> >> Now, please note that I do *not* run a regular cygwin1.dll but rather >> an >> msys-2.0.dll that I had to patch even more to support users of the >> previous >> Git for Windows version (which was based on MSys1 and did things like >> allowing users to override their home directory using the HOME >> environment >> variable). >> >> Starting with the diff on top of cygwin1.dll's sources, I bisected the >> problem down to the commit "Fix OPOST for non-Cygwin pty slaves": >> >> https://cygwin.com/git/gitweb.cgi?p=newlib-cygwin.git;a=commit;h=063e7da36fda3f42619d7df606d9f3d4920605aa >> >> With this commit reverted, on top of the MSys2 and the Git for Windows >> patches, the mintty window appears correctly again when launched on >> 32-bit >> XP via said GUI executable. You can see my current state here: >> >> https://github.com/git-for-windows/msys2-runtime/tree/aae52e6d23e92cf71e6f7777ff9bb49588be8fdc >> >> I would like to ask you for advice how to debug this regression >> further >> because I really would like to revert the revert and have a proper >> fix. Or >> maybe you have an idea how I can fix it directly? > > Hmm, this seems to be another fallout from introducing different OPOST > processing (via spearate pipes) for native and Cygwin processes. > Does the patch from https://cygwin.com/ml/cygwin/2015-05/msg00282.html > help, by any chance? Sadly, my test program still hangs when running with an msys2-runtime with that patch applied. I cannot say where exactly it hangs, just that the mintty I call from a GUI program spawns a thread that seems to wait until something times out. I won't be able to investigate this during the next week, but I could put more effort into shedding more light into the problem in the second or third week of June. Ciao, Dscho -- 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
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