[Qemu-devel] [Bug 1552549] [NEW] qemu-system-i386 verison 2.5.50 fails at lmsw instruction

[liutgnu]

Public bug reported:

I cloned qemu source code from github.com, and compiled it on my Kubuntu
15.10 laptop to run my little OS. When booting my little OS, the virtual
machine's screen keep blinking, I guess it's the virtual machine
rebooting on and on automatically for some unknown reason, but there is
no further information shown on Kubuntu's terminal. I'm pretty sure this
problem is not caused by my little OS, because it works just fine in
qemu-system-i386 version 2.5.0.

I debugged my OS and find this problem happens when executing
instruction "lmsw ax". Is this a bug, can anyone help me out?

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1552549

Title:
  qemu-system-i386 verison 2.5.50 fails at lmsw instruction

Status in QEMU:
  New

Bug description:
  I cloned qemu source code from github.com, and compiled it on my
  Kubuntu 15.10 laptop to run my little OS. When booting my little OS,
  the virtual machine's screen keep blinking, I guess it's the virtual
  machine rebooting on and on automatically for some unknown reason, but
  there is no further information shown on Kubuntu's terminal. I'm
  pretty sure this problem is not caused by my little OS, because it
  works just fine in qemu-system-i386 version 2.5.0.

  I debugged my OS and find this problem happens when executing
  instruction "lmsw ax". Is this a bug, can anyone help me out?

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