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

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Date:	Sat, 8 Feb 2014 11:57:52 +0800
From:	Huacai Chen <chenhuacai@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	Paul Burton <paul.burton@...tec.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Commit 597ce1723 (MIPS: Support for 64-bit FP with O32 binaries)
 causing qemu hang with mips64 kernels

Hi,

Maybe you can try this:
http://patchwork.linux-mips.org/patch/6506/
http://patchwork.linux-mips.org/patch/6507/

On Sat, Feb 8, 2014 at 11:39 AM, Guenter Roeck <linux@...ck-us.net> 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
>
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