Re: Build error with kernel from 2026-08-21

["Jürgen Groß" <jgross@suse.com>]

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On 21.08.26 11:35, Jiri Kosina wrote:
> On Fri, 21 Aug 2026, Jiri Kosina wrote:
> 
>>>>>> make[3]: *** [/home/gross/linux/head/scripts/Makefile.build:550: drivers]
>>>>>> Error 2
>>>>>> make[1]: Leaving directory '/home/gross/linux/head/jg/build/x86_32-yes'
>>>>>> make[2]: *** [/home/gross/linux/head/Makefile:2193: .] Error 2
>>>>>> make[1]: *** [/home/gross/linux/head/Makefile:248: __sub-make] Error 2
>>>>>> make: *** [Makefile:248: __sub-make] Error 2
>>>>>> [msr]~/linux/head> mk x86_32-yes
>>>>>> make O=jg/build/x86_32-yes CC=gcc-13 PYTHON3=python3.11
>>>>>> make[1]: Entering directory '/home/gross/linux/head/jg/build/x86_32-yes'
>>>>>>    CC      drivers/hid/hid-hyperv.o
>>>>>> In file included from /home/gross/linux/head/include/linux/string.h:383,
>>>>>>                     from
>>>>>>    /home/gross/linux/head/arch/x86/include/asm/page_32.h:18,
>>>>>>                     from
>>>>>>    /home/gross/linux/head/arch/x86/include/asm/page.h:14,
>>>>>>                     from
>>>>>>    /home/gross/linux/head/arch/x86/include/asm/processor.h:20,
>>>>>>                     from
>>>>>>    /home/gross/linux/head/arch/x86/include/asm/timex.h:5,
>>>>>>                     from /home/gross/linux/head/include/linux/timex.h:67,
>>>>>>                     from /home/gross/linux/head/include/linux/time32.h:13,
>>>>>>                     from /home/gross/linux/head/include/linux/time.h:60,
>>>>>>                     from /home/gross/linux/head/include/linux/stat.h:19,
>>>>>>                     from /home/gross/linux/head/include/linux/module.h:13,
>>>>>>                     from /home/gross/linux/head/drivers/hid/hid-hyperv.c:8:
>>>>>> In function ‘fortify_memset_chk’,
>>>>>>      inlined from ‘mousevsc_device_info_valid_descriptor’ at
>>>>>> /home/gross/linux/ head/drivers/hid/hid-hyperv.c:691:2:
>>>>>> /home/gross/linux/head/include/linux/fortify-string.h:430:25: error: call
>>>>>> to
>>>>>> ‘__write_overflow_field’ declared with attribute warning: detected write
>>>>>> beyond size of field (1st parameter); maybe use struct_group()?
>>>>>> [-Werror=attribute- warning]
>>>>>>      430 |                         __write_overflow_field(p_size_field,
>>>>>>    size);
>>>>>>          |
>>>>>>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>> In function ‘fortify_memset_chk’,
>>>>>>      inlined from ‘mousevsc_device_info_report_desc_oob’ at
>>>>>> /home/gross/linux/ head/drivers/hid/hid-hyperv.c:717:2:
>>>>>> /home/gross/linux/head/include/linux/fortify-string.h:430:25: error: call
>>>>>> to
>>>>>> ‘__write_overflow_field’ declared with attribute warning: detected write
>>>>>> beyond size of field (1st parameter); maybe use struct_group()?
>>>>>> [-Werror=attribute- warning]
>>>>>>      430 |                         __write_overflow_field(p_size_field,
>>>>>>    size);
>>>>>>          |
>>>>>>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>> cc1: all warnings being treated as errors
>>>>>> make[5]: *** [/home/gross/linux/head/scripts/Makefile.build:290:
>>>>>> drivers/hid/ hid-hyperv.o] Error 1
>>>>>> make[4]: *** [/home/gross/linux/head/scripts/Makefile.build:550:
>>>>>> drivers/hid] Error 2
>>>>>> make[3]: *** [/home/gross/linux/head/scripts/Makefile.build:550: drivers]
>>>>>> Error 2
>>>>>> make[2]: *** [/home/gross/linux/head/Makefile:2193: .] Error 2
>>>>>> make[1]: Leaving directory '/home/gross/linux/head/jg/build/x86_32-yes'
>>>>>> make[1]: *** [/home/gross/linux/head/Makefile:248: __sub-make] Error 2
>>>>>> make: *** [Makefile:248: __sub-make] Error 2
>>>>>
>>>>> A git bisect flagged commit 83df7b5fa6735b5084ecd296a0f67208650ba497 to be
>>>>> the
>>>>> problematic patch.
>>>>
>>>> Hi,
>>>>
>>>> this was reported by syzbot two days ago. I asked it to test a candidate
>>>> fix [1], but it never responded back. Can you give it a quick shot in your
>>>> 32bit build environment, please?
>>>>
>>>> Thanks.
>>>>
>>>> [1]
>>>> https://lore.kernel.org/all/s6r47sn1-pr1p-8s7r-o164-q27s2o40p9r1@fhfr.pbz/
>>>>
>>>
>>> BTW, I'm seeing the build failure in 64-bit environment, too.
>>
>> Ah, that's actually a different issue than the syzbot-reported one. I'll
>> look into this one after I am done with the other build failure introduced
>> by the same commit.
> 
> Can you please test the one below? Thanks.
> 
> diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
> index 6579bd19da13..4a10b24da9fa 100644
> --- a/drivers/hid/hid-hyperv.c
> +++ b/drivers/hid/hid-hyperv.c
> @@ -687,7 +687,7 @@ static void mousevsc_device_info_valid_descriptor(struct kunit *test)
>   
>   	info->hid_descriptor.bLength = sizeof(struct hid_descriptor);
>   	info->hid_descriptor.rpt_desc.wDescriptorLength = cpu_to_le16(4);
> -	report = ((u8 *)&info->hid_descriptor) + info->hid_descriptor.bLength;
> +	report = (u8 *)info + offsetof(struct synthhid_device_info, hid_descriptor) + info->hid_descriptor.bLength;
>   	memset(report, 0x42, 4);
>   
>   	mousevsc_on_receive_device_info(input_dev, info, sizeof(*info) + 4);
> @@ -713,7 +713,7 @@ static void mousevsc_device_info_report_desc_oob(struct kunit *test)
>   
>   	info->hid_descriptor.bLength = sizeof(struct hid_descriptor);
>   	info->hid_descriptor.rpt_desc.wDescriptorLength = cpu_to_le16(64);
> -	report = ((u8 *)&info->hid_descriptor) + info->hid_descriptor.bLength;
> +	report = (u8 *)info + offsetof(struct synthhid_device_info, hid_descriptor) + info->hid_descriptor.bLength;
>   	memset(report, 0x42, 8);
>   
>   	mousevsc_on_receive_device_info(input_dev, info, sizeof(*info) + 8);
> 

Yes, this is fixing the issue I'm seeing.


Juergen

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