Re: [Qemu-devel] 'tcg fatal error' with qemu v2.6.0-rc3 (bisected)

[Guenter Roeck <linux@roeck-us.net>]

On Wed, Apr 27, 2016 at 08:57:24AM +0200, Aurelien Jarno wrote:
> On 2016-04-26 20:12, Guenter Roeck wrote:
> > Hi,
> > 
> > when running qemu version 2.6.0-rc3, I get the following error message.
> > 
> > /opt/buildbot/qemu/qemu/tcg/tcg.c:1769: tcg fatal error
> > 
> > qemu command line is as follows.
> > 
> > qemu-system-ppc64 -M mpc8544ds \
> > 	-cpu e5500 \
> > 	-m 1024 -kernel arch/powerpc/boot/uImage -initrd busybox-ppc.cpio \
> > 	-nographic -vga none -monitor null -no-reboot \
> > 	--append "rdinit=/sbin/init console=tty console=ttyS0" \
> > 	-machine "dt_compatible=fsl,,P5020DS"
> > 
> > Files are from my test suite at https://github.com/groeck/linux-build-test.
> 
> I have try to reproduce the issue with a kernel build with my toolchain
> and your defconfig, but it worked for me. Could you please share the
> binaries so that it is easier to reproduce the issue?
> 
I forgot to mention - it happens during reboot.

Assuming you are using my root file system, try adding "doreboot" to the command
line.

Thanks,
Guenter

> > Bisect points to commit 40ae5c62ebaaf7d9d3b93b88c2d32bf6342f7889 ("tcg:
> > Introduce temp_load"). Bisect log is attached.
> 
> I look at this patch again quickly, and I don't think the bug is
> actually introduced by this commit, it is just that it does more strict
> tests on the value. I guess it was working before by chance by loading
> a random value into the register. That said to look deeper into it, it
> would be better to be able to reproduce the issue.
> 
> Aurelien
> 
> -- 
> Aurelien Jarno                          GPG: 4096R/1DDD8C9B
> aurelien@aurel32.net                 http://www.aurel32.net