diff options
Diffstat (limited to 'results/classifier/accel-gemma3:12b/kvm/2244')
| -rw-r--r-- | results/classifier/accel-gemma3:12b/kvm/2244 | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/results/classifier/accel-gemma3:12b/kvm/2244 b/results/classifier/accel-gemma3:12b/kvm/2244 new file mode 100644 index 000000000..cedde6a0d --- /dev/null +++ b/results/classifier/accel-gemma3:12b/kvm/2244 @@ -0,0 +1,47 @@ + +Regression in 8.2.90: cpu_physical_memory_snapshot_get_dirty: assertion failed +Description of problem: +On executing the image from QEMU advent calendar 2014, door 12 the following error is shown and QEMU exists. + +On Debian (built on git-repo) +``` +$ qemu-system-i386 oberon/oberon.qcow2 +qemu-system-i386: ../system/physmem.c:948: cpu_physical_memory_snapshot_get_dirty: Zusicherung »start + length <= snap->end« nicht erfüllt. +Abgebrochen +``` +On Windows (built on qemu-9.0.0-rc0.tar.xz) +``` +$ qemu-system-i386 oberon/oberon.qcow2 +ERROR:../qemu-9.0.0-rc0/system/physmem.c:946:cpu_physical_memory_snapshot_get_dirty: assertion failed: (start + length <= snap->end) +Bail out! ERROR:../qemu-9.0.0-rc0/system/physmem.c:946:cpu_physical_memory_snapshot_get_dirty: assertion failed: (start + length <= snap->end) +``` +Steps to reproduce: +1. Retrieve oberon.tar.xz with `wget http://qemu-advent-calendar.org/2014/download/oberon.tar.xz` +2. Extract with `tar -xf oberon.tar.xz` +3. Execute with `qemu-system-i386 oberon/oberon.qcow2` +Additional information: +The same error is shown for QEMU advent calendar 2014, door 15 (Plan 9 from Bell Labs) soon after switch to graphical mode. + +git bisect result: +``` +973a724eb006f674301a0c45f34b3c08dee0fe49 is the first bad commit +commit 973a724eb006f674301a0c45f34b3c08dee0fe49 +Author: Paolo Bonzini <pbonzini@redhat.com> +Date: Mon Dec 29 14:48:14 2014 +0100 + + vga: implement horizontal pel panning in graphics modes + + This implements smooth scrolling, as used for example by Commander Keen + and Second Reality. + + Unfortunately, this is not enough to avoid tearing in Commander Keen, + because sometimes the wrong start address is used for a frame. + On real EGA, the panning register is sampled on every line, while + the display start is latched for the next frame at the start of the + vertical retrace. On real VGA, the panning register is also latched, + but at the end of the vertical retrace. It looks like Keen exploits + this by only waiting for horizontal retrace when setting the display + start, but implementing it breaks the 256-color Keen games... + + Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> +``` |