[Bug 204209] New: kernel 5.2.1: "floating point exception" in qemu with kvm enabled

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=204209

            Bug ID: 204209
           Summary: kernel 5.2.1: "floating point exception" in qemu with
                    kvm enabled
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.2.1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: antdev66@gmail.com
        Regression: No

After updating the kernel from 5.1.17 to 5.2.1, when I use the g++ compiler in
qemu with kvm enabled, often the compiler launched in the guest for compile my
sources ends with this error: "exception in floating point".

Moreever it is not possible to update the bsd system because the process (that
use g++ compiler) exits with the same error.

Same thing for some system utilities, like "pkg update".

But if I boot the system with the previous 5.1.17 kernel and launch qemu, as
indicated above, everything works fine and I don't detect errors.

Command line is:

/usr/bin/qemu-system-x86_64 -k it -machine accel=kvm -m 4096 -no-fd-bootchk
-show-cursor -drive file="vmdragon.img",if=ide,media=disk -boot once=c,menu=off
-net none -rtc base=localtime -name "vmdragon" -smp 8 -vga std -device
qemu-xhci,id=xhci

I can't test without kvm because the process is very slow, but I think the
problem could be in some changes made to the kvm module.

Thanks,
Antonio

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