Build/qemu test results for v4.18-rc4

Build/qemu test results for v4.18-rc4

[Guenter Roeck]

Build results:
	total: 134 pass: 130 fail: 4
Failed builds: 
	nds32:defconfig 
	nds32:allnoconfig 
	s390:allmodconfig 
	sparc32:allmodconfig
Qemu test results:
	total: 158 pass: 158 fail: 0

---
nds32:defconfig:

nds32le-linux-ld: kernel/time/timekeeping.o: in function `timekeeping_init':
timekeeping.c:(.init.text+0x1a8): undefined reference to `__ashldi3'
nds32le-linux-ld: timekeeping.c:(.init.text+0x1ac): undefined reference to `__ashldi3'
nds32le-linux-ld: timekeeping.c:(.init.text+0x1ec): undefined reference to `__lshrdi3'
nds32le-linux-ld: timekeeping.c:(.init.text+0x1f0): undefined reference to `__lshrdi3'

Fix is available in -next with commit 78945c357f5 ("nds32: Fix build error
caused by configuration flag rename").

---
s390:allmodconfig:

arch/s390/kernel/als.o: In function `verify_facilities':
als.c:(.init.text+0x24): undefined reference to `latent_entropy'
als.c:(.init.text+0xae): undefined reference to `latent_entropy'
make[3]: *** [arch/s390/boot/compressed/vmlinux] Error 1
make[2]: *** [arch/s390/boot/compressed/vmlinux] Error 2
make[1]: *** [bzImage] Error 2

This problem is only seen when using a compiler which has the relevant
plugins enabled. Bisect points to commit 1658dcee3d43ed ("gcc-plugins:
allow to enable GCC_PLUGINS for COMPILE_TEST") as the culprit. I don't
know if a fix for v4.18 has been submitted. The s390 boot code in -next
has been rearranged and the problem is no longer seen there.

---
sparc32:allmodconfig:

include/linux/highmem.h: In function 'clear_user_highpage':
include/linux/highmem.h:137:31: error:
	passing argument 1 of 'sparc_flush_page_to_ram' from incompatible pointer type

A possible fix is available at https://patchwork.kernel.org/patch/10497941/.

Guenter

Re: Build/qemu test results for v4.18-rc4

[Kees Cook]

On Mon, Jul 9, 2018 at 10:55 AM, Guenter Roeck <linux@roeck-us.net> wrote:
> s390:allmodconfig:
>
> arch/s390/kernel/als.o: In function `verify_facilities':
> als.c:(.init.text+0x24): undefined reference to `latent_entropy'
> als.c:(.init.text+0xae): undefined reference to `latent_entropy'
> make[3]: *** [arch/s390/boot/compressed/vmlinux] Error 1
> make[2]: *** [arch/s390/boot/compressed/vmlinux] Error 2
> make[1]: *** [bzImage] Error 2
>
> This problem is only seen when using a compiler which has the relevant
> plugins enabled. Bisect points to commit 1658dcee3d43ed ("gcc-plugins:
> allow to enable GCC_PLUGINS for COMPILE_TEST") as the culprit. I don't
> know if a fix for v4.18 has been submitted. The s390 boot code in -next
> has been rearranged and the problem is no longer seen there.

Hm, that would imply that mm/page_alloc.o wasn't visible during the
als.o linking? But ... if the problem is gone, I guess... good?

-Kees

-- 
Kees Cook
Pixel Security

Re: Build/qemu test results for v4.18-rc4

[Christian Borntraeger]

On 07/09/2018 08:06 PM, Kees Cook wrote:
> On Mon, Jul 9, 2018 at 10:55 AM, Guenter Roeck <linux@roeck-us.net> wrote:
>> s390:allmodconfig:
>>
>> arch/s390/kernel/als.o: In function `verify_facilities':
>> als.c:(.init.text+0x24): undefined reference to `latent_entropy'
>> als.c:(.init.text+0xae): undefined reference to `latent_entropy'
>> make[3]: *** [arch/s390/boot/compressed/vmlinux] Error 1
>> make[2]: *** [arch/s390/boot/compressed/vmlinux] Error 2
>> make[1]: *** [bzImage] Error 2
>>
>> This problem is only seen when using a compiler which has the relevant
>> plugins enabled. Bisect points to commit 1658dcee3d43ed ("gcc-plugins:
>> allow to enable GCC_PLUGINS for COMPILE_TEST") as the culprit. I don't
>> know if a fix for v4.18 has been submitted. The s390 boot code in -next
>> has been rearranged and the problem is no longer seen there.
> 
> Hm, that would imply that mm/page_alloc.o wasn't visible during the
> als.o linking? But ... if the problem is gone, I guess... good?

als.o is used to detect if the kernel was compiled for a newer generation
than the hardware that we are running on (very early). So it is compiled
without gcov, kcov,ubsan and with a different march -in other words special.
In linux-next we moved the als part to the decompressor which avoids all
these kind of special handling. As this is part of a bigger patch set it 
would be  non-trivial to backport that for 4.18.
So unless we want to have it fixed for 4.18 I think we are fine.

Re: Build/qemu test results for v4.18-rc4

[Kees Cook]

On Mon, Jul 9, 2018 at 11:16 AM, Christian Borntraeger
<borntraeger@de.ibm.com> wrote:
>
>
> On 07/09/2018 08:06 PM, Kees Cook wrote:
>> On Mon, Jul 9, 2018 at 10:55 AM, Guenter Roeck <linux@roeck-us.net> wrote:
>>> s390:allmodconfig:
>>>
>>> arch/s390/kernel/als.o: In function `verify_facilities':
>>> als.c:(.init.text+0x24): undefined reference to `latent_entropy'
>>> als.c:(.init.text+0xae): undefined reference to `latent_entropy'
>>> make[3]: *** [arch/s390/boot/compressed/vmlinux] Error 1
>>> make[2]: *** [arch/s390/boot/compressed/vmlinux] Error 2
>>> make[1]: *** [bzImage] Error 2
>>>
>>> This problem is only seen when using a compiler which has the relevant
>>> plugins enabled. Bisect points to commit 1658dcee3d43ed ("gcc-plugins:
>>> allow to enable GCC_PLUGINS for COMPILE_TEST") as the culprit. I don't
>>> know if a fix for v4.18 has been submitted. The s390 boot code in -next
>>> has been rearranged and the problem is no longer seen there.
>>
>> Hm, that would imply that mm/page_alloc.o wasn't visible during the
>> als.o linking? But ... if the problem is gone, I guess... good?
>
> als.o is used to detect if the kernel was compiled for a newer generation
> than the hardware that we are running on (very early). So it is compiled
> without gcov, kcov,ubsan and with a different march -in other words special.
> In linux-next we moved the als part to the decompressor which avoids all
> these kind of special handling. As this is part of a bigger patch set it
> would be  non-trivial to backport that for 4.18.
> So unless we want to have it fixed for 4.18 I think we are fine.

Okay, cool. If you want to fix it for 4.18, it should just be
something like this in the Makefile:

CFLAGS_als.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)

-Kees

-- 
Kees Cook
Pixel Security

Re: Build/qemu test results for v4.18-rc4

[Guenter Roeck]

On Mon, Jul 09, 2018 at 11:19:17AM -0700, Kees Cook wrote:
> On Mon, Jul 9, 2018 at 11:16 AM, Christian Borntraeger
> <borntraeger@de.ibm.com> wrote:
> >
> >
> > On 07/09/2018 08:06 PM, Kees Cook wrote:
> >> On Mon, Jul 9, 2018 at 10:55 AM, Guenter Roeck <linux@roeck-us.net> wrote:
> >>> s390:allmodconfig:
> >>>
> >>> arch/s390/kernel/als.o: In function `verify_facilities':
> >>> als.c:(.init.text+0x24): undefined reference to `latent_entropy'
> >>> als.c:(.init.text+0xae): undefined reference to `latent_entropy'
> >>> make[3]: *** [arch/s390/boot/compressed/vmlinux] Error 1
> >>> make[2]: *** [arch/s390/boot/compressed/vmlinux] Error 2
> >>> make[1]: *** [bzImage] Error 2
> >>>
> >>> This problem is only seen when using a compiler which has the relevant
> >>> plugins enabled. Bisect points to commit 1658dcee3d43ed ("gcc-plugins:
> >>> allow to enable GCC_PLUGINS for COMPILE_TEST") as the culprit. I don't
> >>> know if a fix for v4.18 has been submitted. The s390 boot code in -next
> >>> has been rearranged and the problem is no longer seen there.
> >>
> >> Hm, that would imply that mm/page_alloc.o wasn't visible during the
> >> als.o linking? But ... if the problem is gone, I guess... good?
> >
> > als.o is used to detect if the kernel was compiled for a newer generation
> > than the hardware that we are running on (very early). So it is compiled
> > without gcov, kcov,ubsan and with a different march -in other words special.
> > In linux-next we moved the als part to the decompressor which avoids all
> > these kind of special handling. As this is part of a bigger patch set it
> > would be  non-trivial to backport that for 4.18.
> > So unless we want to have it fixed for 4.18 I think we are fine.
> 
> Okay, cool. If you want to fix it for 4.18, it should just be
> something like this in the Makefile:
> 
> CFLAGS_als.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
> 

Yes, I confirmed that this fixes the problem.

Thanks,
Guenter

Re: Build/qemu test results for v4.18-rc4

[Guenter Roeck]

On Mon, Jul 09, 2018 at 08:16:04PM +0200, Christian Borntraeger wrote:
> 
> 
> On 07/09/2018 08:06 PM, Kees Cook wrote:
> > On Mon, Jul 9, 2018 at 10:55 AM, Guenter Roeck <linux@roeck-us.net> wrote:
> >> s390:allmodconfig:
> >>
> >> arch/s390/kernel/als.o: In function `verify_facilities':
> >> als.c:(.init.text+0x24): undefined reference to `latent_entropy'
> >> als.c:(.init.text+0xae): undefined reference to `latent_entropy'
> >> make[3]: *** [arch/s390/boot/compressed/vmlinux] Error 1
> >> make[2]: *** [arch/s390/boot/compressed/vmlinux] Error 2
> >> make[1]: *** [bzImage] Error 2
> >>
> >> This problem is only seen when using a compiler which has the relevant
> >> plugins enabled. Bisect points to commit 1658dcee3d43ed ("gcc-plugins:
> >> allow to enable GCC_PLUGINS for COMPILE_TEST") as the culprit. I don't
> >> know if a fix for v4.18 has been submitted. The s390 boot code in -next
> >> has been rearranged and the problem is no longer seen there.
> > 
> > Hm, that would imply that mm/page_alloc.o wasn't visible during the
> > als.o linking? But ... if the problem is gone, I guess... good?
> 
> als.o is used to detect if the kernel was compiled for a newer generation
> than the hardware that we are running on (very early). So it is compiled
> without gcov, kcov,ubsan and with a different march -in other words special.
> In linux-next we moved the als part to the decompressor which avoids all
> these kind of special handling. As this is part of a bigger patch set it 
> would be  non-trivial to backport that for 4.18.
> So unless we want to have it fixed for 4.18 I think we are fine.
> 

Fine with me. Please let me know if the problem won't be fixed, and I'll
disable allmodconfig test builds for s390 images in v4.18.

Thanks,
Guenter