linux-kernel - Re: [PROBLEM linux-next] Segfault while building headers with dpkg-deb

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Message-ID: <70b32083-34fb-42a5-b9bd-6f4fd21f70fd@gmail.com>
Date: Fri, 5 Jul 2024 22:57:11 +0200
From: Mirsad Todorovac <mtodorovac69@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Linux Kernel Build System <linux-kbuild@...r.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PROBLEM linux-next] Segfault while building headers with
 dpkg-deb

On 7/2/24 10:18, Masahiro Yamada wrote:
> On Sat, Jun 29, 2024 at 3:59 AM Mirsad Todorovac <mtodorovac69@...il.com> wrote:
>>
>> Hi all,
>>
>> On the vanilla linux-next tree, branch next-20240627, there happens to be a bug while building
>> with the randconfig seed KCONFIG_SEED=0x90E8E591:
>>
>>   .
>>   .
>>   .
>>   XZ      debian/linux-image-6.10.0-rc5-next-20240627-dirty/lib/modules/6.10.0-rc5-next-20240627-dirty/kernel/samples/trace_events/trace-events-sample.ko.xz
>>   XZ      debian/linux-image-6.10.0-rc5-next-20240627-dirty/lib/modules/6.10.0-rc5-next-20240627-dirty/kernel/samples/trace_events/trace_custom_sched.ko.xz
>>   XZ      debian/linux-image-6.10.0-rc5-next-20240627-dirty/lib/modules/6.10.0-rc5-next-20240627-dirty/kernel/samples/ftrace/sample-trace-array.ko.xz
>>   XZ      debian/linux-image-6.10.0-rc5-next-20240627-dirty/lib/modules/6.10.0-rc5-next-20240627-dirty/kernel/samples/fprobe/fprobe_example.ko.xz
>> dpkg-deb: building package 'linux-libc-dev' in '../linux-libc-dev_6.10.0-rc5-45_i386.deb'.
>>   DEPMOD  debian/linux-image-6.10.0-rc5-next-20240627-dirty/lib/modules/6.10.0-rc5-next-20240627-dirty
>> dpkg-deb: building package 'linux-headers-6.10.0-rc5-next-20240627-dirty' in '../linux-headers-6.10.0-rc5-next-20240627-dirty_6.10.0-rc5-45_i386.deb'.
>> Segmentation fault (core dumped)
>> make[6]: *** [scripts/Makefile.modinst:128: depmod] Error 139
>> make[5]: *** [Makefile:1842: modules_install] Error 2
>> make[4]: *** [Makefile:2058: run-command] Error 2
>> make[3]: *** [debian/rules:61: binary-image] Error 2
>> make[3]: *** Waiting for unfinished jobs....
>> dpkg-deb: building package 'linux-image-6.10.0-rc5-next-20240627-dirty-dbg' in '../linux-image-6.10.0-rc5-next-20240627-dirty-dbg_6.10.0-rc5-45_i386.deb'.
>> dpkg-buildpackage: error: make -f debian/rules binary subprocess returned exit status 2
>> make[2]: *** [scripts/Makefile.package:121: bindeb-pkg] Error 2
>> make[1]: *** [/home/marvin/linux/kernel/linux-next/Makefile:1555: bindeb-pkg] Error 2
>> make: *** [Makefile:240: __sub-make] Error 2
>>
>> Build log and .config are attached at your convenience.
> 
> 
> 
> 
> 
> If you used an old kmod version, this is a known issue.
> 
> https://lore.kernel.org/linux-kbuild/E1rNVlL-000qDm-Pg@rmk-PC.armlinux.org.uk/
> 
> A quick solution is to upgrade your kmod version.

I see. Sorry then for the noise and duplicated work.

It might be inevitable that I will do something dumb more often than not when testing
randconfig errors from such a vast number of lines of code ... :-/

My kmod is as follows:

ii  kmod           29-1ubuntu1  amd64        tools for managing Linux kernel modules

I thought of upgrading to 24.04 LTS, but when upgrading kmod I've lost the capacity to boot
the older kernels in bisect process?

Probably, it would be for the best if I had several versions of Ubuntu in multiple boot
options? However, I have not yet done that ...

Best regards,
Mirsad Todorovac

> --
> Best Regards
> Masahiro Yamada