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

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

[Guenter Roeck]

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

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

[Huacai Chen]

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@roeck-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
>

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

[Guenter Roeck]

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.

Thanks a lot!

Guenter

> On Sat, Feb 8, 2014 at 11:39 AM, Guenter Roeck <linux@roeck-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
>>
>
>

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@roeck-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
>>>
>>
>>
>

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

[Huacai Chen]

Hi, Ralf,

Could these two patches be merged in 3.14 (there is an updated
version: http://patchwork.linux-mips.org/patch/6550/ and
http://patchwork.linux-mips.org/patch/6551/)?

And by the way, is the V19 of Loongson-3's patchset good enough to be
merged in 3.15?

Huacai

On Tue, Feb 25, 2014 at 12:13 PM, Guenter Roeck <linux@roeck-us.net> wrote:
> 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@roeck-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
>>>>
>>>
>>>
>>
>