This commit has fixed it.
https://git.qemu.org/?p=qemu.git;a=commit;h=a89fe6c3297
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1785197
Title:
1. Add breakpoint at vga.c:790 s->vbe_regs[VBE_DISPI_INDEX_ENABLE] =
val;
(gdb) b vga.c:790
Breakpoint 2 at 0x56100ad10521: file /qemu-2.12/hw/display/vga.c, line 790.
(gdb) c
Continuing.
2. When breakpoint is hited , val is 0
Thread 5 "CPU 1/KVM" hit Breakpoint 2, vbe_ioport_write_data
(opaque
I have tried many times to reproduce the issue.
1. Add a breakpoint
(gdb) b memory_region_snapshot_and_clear_dirty if size==0
Breakpoint 1 at 0x55ef37b7d450: file /qemu-2.12/memory.c, line 1986.
2. Occasionally the breakpoint hited, size is 0
(gdb) c
Continuing.
Thread 1 "kvm" hit Breakpoint 1, m
