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Re: [Qemu-devel] qemu 2.12.0 crash during install windows 10 with vga.
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] qemu 2.12.0 crash during install windows 10 with vga. |
Date: |
Wed, 29 Aug 2018 11:55:11 +0100 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Changlimin (address@hidden) wrote:
> Hi,
> I have the same issue as https://www.qubes-os.org/doc/windows-vm/ , it's not
> easy to reproduce.
> cpu_physical_memory_snapshot_get_dirty: Assertion `start + length <=
> snap->end' failed
>
> Qemu version is 2.12.0.
> (gdb) bt
> #0 0x00007f504ed6fc37 in raise () from /lib/x86_64-linux-gnu/libc.so.6
> #1 0x00007f504ed73028 in abort () from /lib/x86_64-linux-gnu/libc.so.6
> #2 0x00007f504ed68bf6 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
> #3 0x00007f504ed68ca2 in __assert_fail () from
> /lib/x86_64-linux-gnu/libc.so.6
> #4 0x00005585bbdc9641 in cpu_physical_memory_snapshot_get_dirty
> (address@hidden, start=<optimized out>, length=<optimized out>)
> at /qemu-2.12/exec.c:1264
> #5 0x00005585bbe2b4de in memory_region_snapshot_get_dirty (address@hidden,
> address@hidden, addr=<optimized out>,
> size=<optimized out>) at /qemu-2.12/memory.c:1997
> #6 0x00005585bbe552a4 in vga_draw_graphic (full_update=0, s=0x5585c06e3d00)
> at /qemu-2.12/hw/display/vga.c:1671
> #7 vga_update_display (opaque=0x5585c06e3d00) at
> /qemu-2.12/hw/display/vga.c:1767
> #8 0x00005585bc0d9a8f in qemu_spice_display_refresh (ssd=0x5585c06e3930) at
> /qemu-2.12/ui/spice-display.c:478
> #9 0x00005585bc0ced72 in dpy_refresh (s=0x5585c081b2a0) at
> /qemu-2.12/ui/console.c:1629
> #10 gui_update (opaque=0x5585c081b2a0) at /qemu-2.12/ui/console.c:203
> #11 0x00005585bc1d333c in timerlist_run_timers (timer_list=0x5585bee1f950) at
> /qemu-2.12/util/qemu-timer.c:536
> #12 0x00005585bc1d35a3 in qemu_clock_run_timers (type=QEMU_CLOCK_REALTIME) at
> /qemu-2.12/util/qemu-timer.c:547
> #13 qemu_clock_run_all_timers () at /qemu-2.12/util/qemu-timer.c:674
> #14 0x00005585bc1d3aa4 in main_loop_wait (nonblocking=<optimized out>) at
> /qemu-2.12/util/main-loop.c:528
> #15 0x00005585bbdc2f8a in main_loop () at /qemu-2.12/vl.c:1973
> #16 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
> at /qemu-2.12/vl.c:4804
>
> (gdb) frame 5
> (gdb) p/x *snap
> $1 = {start = 0x1000c0000, end = 0x1000c0000, dirty = 0x5585bfdc3000}
>
> Here the snap->start is identical to snap->end , I think something is wrong.
> In function vga_draw_graphic, the snap is allocated from
> region_start/region_end.
> snap = memory_region_snapshot_and_clear_dirty(&s->vram, region_start,
> region_end -
> region_start,
> DIRTY_MEMORY_VGA);
>
> Is that possible for region_start== region_end ?
Could this be the same bug as
https://bugs.launchpad.net/qemu/+bug/1784900/ ?
I'm not sure if the bug existed in 2.12.0 though.
Dave
> BR,
> Chang Limin
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK