Re: Commit 597ce1723 (MIPS: Support for 64-bit FP with O32 binaries) causing qemu hang with mips64 kernels

[Guenter Roeck]

On 02/07/2014 08:55 PM, Guenter Roeck wrote:
> On 02/07/2014 07:57 PM, Huacai Chen wrote:
> > Hi,
> >
> > Maybe you can try this:
> > http://patchwork.linux-mips.org/patch/6506/
> > http://patchwork.linux-mips.org/patch/6507/
> With those two patches applied the problem is gone.

Any idea if and when those patches may find their way upstream ?
3.14-rc4 still has the problem.

Thanks,
Guenter

> Thanks a lot!
>
> Guenter
>
> > On Sat, Feb 8, 2014 at 11:39 AM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > > Hi all,
> > >
> > > in 3.14-rc1, my mips64 qemu test fails. The image boots and then hangs.
> > > Bisect points to commit 597ce1723 (MIPS: Support for 64-bit FP with O32
> > > binaries).
> > > Reverting this commit fixes the problem. Disabling MIPS_O32_FP64_SUPPORT
> > > in my test image does _not_ solve the problem. The qemu version does not
> > > seem
> > > to make a difference; I tested with qemu 1.6.0 and 1.7.0.
> > >
> > > Console log output is available in
> > > http://server.roeck-us.net:8010/builders/qemu-mips64-master/builds/34/steps/buildcommand/logs/stdio
> > >
> > > When the problem is seen, the emulation hangs as can be seen in the log,
> > > and the qemu process consumes 100% CPU until it is killed.
> > >
> > > qemu command line is
> > >
> > > qemu-system-mips64 -kernel vmlinux -M malta -hda
> > > core-image-minimal-qemumips64.ext3 \
> > > -vga cirrus -usb -usbdevice wacom-tablet -no-reboot -m 128 --append
> > > "root=/dev/hda \
> > > rw mem=128M console=ttyS0 console=tty" -nographic
> > >
> > > The same configuration works fine with earlier kernels. I'll be happy to
> > > provide
> > > the detailed configuration as well as the root file system for testing if
> > > needed.
> > >
> > > Obviously I have no idea if this is a problem with the patch or with qemu.
> > > If there is anything I can do to help tracking down the problem further,
> > > please let me know.
> > >
> > > Thanks,
> > > Guenter

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/