[I've reordered the quoted text.] On Fri, 2015-01-09 at 11:58 -0500, Kevin O'Connor wrote: > Does the crash occur around the time one of the debug messages is > produced, or is the crash seemingly uncorrelated? I don't see > anything suspicious in the log.
Sorry, I forgot to note this in my email. All of the messages are from bootup. There are no logs from when I start the 16-bit application. > Do other 16bit programs in your environment also crash? This suite of programs are the only 16-bit applications we run. > Does the app or some part of its 16bit code run for some time before > the crash, or does the crash occur immiediately (ie, is it NTVDM > crashing or is something in the app causing NTVDM to crash)? It crashes immediately on startup. > I'm a bit surprised that NTVDM would be directly accessing the video > bios, or would allow the 16bit programs it runs to direclty access the > bios. Can you provide some more info on the app itself - is it a dos > program, a windows 3.0 program, does it run full screen or in a > window? If it runs full screen, is it possible to run it in a window, > and does that still crash? I'm fairly confident they're Windows programs, as opposed to DOS programs. They are not fullscreen, they run in a window. > Getting a test case that we could run to reproduce on our side would > really help. Paolo Bonzini suggested I try the 16-bit SkiFree. It works on vgabios. It crashes on seabios, immediately on start. To be specific, 16-bit Skifree crashes with Ubuntu-packaged seabios1.7.4-4 on 32-bit Windows Server 2008 running on Ubuntu Trusty. It also crashes with a build from seabios git I did just now. > Also, can you check if the emulated cirrus vga card has the same issue > (qemu command line of "-vga cirrus" and make sure there is no "-vga > std" - not sure how one does that from libvirt). Skifree still crashes with seabios git and cirrus. I verified there is no -vga std in the command line in the cirrus test. The only "vga" on the command line is: -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 > There are a couple of things you could try to see if it makes any > difference - entirely disable debugging in seavgabios > (CONFIG_DEBUG_LEVEL=0) in the unlikley case that the debug port writes > themselves are causing confusion, and try disabling > CONFIG_VGA_ALLOCATE_EXTRA_STACK. Turning off CONFIG_VGA_ALLOCATE_EXTRA_STACK makes Skifree work on cirrus and vga. I don't know how this all works, but as a guess, I further tried with "vga" (not cirrus) using VGA_EXTRA_STACK_SIZE=256 and VGA_EXTRA_STACK_SIZE=16. The crash recurs with both. -- Richard
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