Hi Jon, glad to view an answer ! Just for your information, since I posted, I did some others tests, and I can reproduce it with k3b (which use qt4) but NOT with kcalc (which use qt5). Then I tried some little python tests from Envisage for qt5 and wasn't able to reproduce this crash.
So I guess there's something wrong with qt4. Tomorrow I'll try your snapshot to confirm or not your fix ! Thanks for your time. On Sun, Jun 23, 2019 at 7:57 PM Jon Turney <[email protected]> wrote: > On 18/06/2019 17:07, Philippe wrote: > > I'm using Cygwin/X and identified a critical bug using some piece of > > software. > > I don't really know where to begin, but I'm able to crash some > applications > > via the application's menu, only with Cygwin/X (no crash with Xming, and > no > > crash under any Linux distributions). > > > > For information, It goes through VirtualGL. I'll give the example on how > to > > reproduce it with a free software : Paraview (under linux). > > > > So you open Paraview, then clic on "View" > show the "Toolbars" submenu, > > then you move your mouse directly on the "Sources" or "Edit" menu, then > it > > crashes immediately. The only error message in the linux shell (from > where > > it was launched) is "paraview: Fatal IO error: client killed". > > > > I got those lines in the XWin.0.log file : > > SetupSysMenu: GetSystemMenu() failed for HWND 0x130746 > > winTopLevelWindowProc - WM_DESTROY - WM_WM_KILL > > Thanks for reporting this problem, and the clear reproduction steps. > > This is an interesting bug in the Cygwin X server's multiwindow mode. It > seems that under some circumstances, when removing a WM_TRANSIENT_FOR > window which in turn had a child WM_TRANSIENT_FOR window (e.g. a menu > which has a sub-menu), the X server's integrated WM would get confused > and think that the main window had been closed (so terminating the > application). > > I've has a go at fixing this and uploaded a snapshot at [1]. Perhaps > you could try that and see if it improves things for you? > > (I guessed you are using 64-bit Cygwin. If you need a 32-bit build > instead, please let me know and I'll generate one) > > [1] > > ftp://cygwin.com/pub/cygwinx/x86_64/XWin.20190623-git-210c90b328cf8f18.exe.bz2 > > -- > Jon Turney > Volunteer Cygwin/X X Server maintainer > -- 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
