linux-kernel - Re: [tip:x86/percpu] [x86/percpu] ca42563486: BUG:kernel_failed_in_early-boot_stage,last_printk:Booting_the_kernel(entry

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Date:   Sat, 7 Oct 2023 11:36:26 +0200
From:   Uros Bizjak <ubizjak@...il.com>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>, Nadav Amit <namit@...are.com>,
        Andy Lutomirski <luto@...nel.org>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, linux-mm@...ck.org
Subject: Re: [tip:x86/percpu] [x86/percpu] ca42563486: BUG:kernel_failed_in_early-boot_stage,last_printk:Booting_the_kernel(entry_offset:#)

On Sat, Oct 7, 2023 at 8:16 AM kernel test robot <oliver.sang@...el.com> wrote:
>
>
>
> Hello,
>
> kernel test robot noticed "BUG:kernel_failed_in_early-boot_stage,last_printk:Booting_the_kernel(entry_offset:#)" on:
>
> commit: ca4256348660cb2162668ec3d13d1f921d05374a ("x86/percpu: Use C for percpu read/write accessors")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/percpu
>
> [test failed on linux-next/master 0f0fe5040de5e5fd9b040672e37725b046e312f0]
>
> in testcase: boot
>
> compiler: gcc-12
> test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
> +--------------------------------------------------------------------------------------+------------+------------+
> |                                                                                      | 9a462b9eaf | ca42563486 |
> +--------------------------------------------------------------------------------------+------------+------------+
> | boot_successes                                                                       | 13         | 0          |
> | boot_failures                                                                        | 0          | 13         |
> | BUG:kernel_failed_in_early-boot_stage,last_printk:Booting_the_kernel(entry_offset:#) | 0          | 13         |
> +--------------------------------------------------------------------------------------+------------+------------+

Since this is a randconfig (x86_64-randconfig-006-20231006), does it
mean that all other configs worked OK:

i386                             allmodconfig   gcc
i386                              allnoconfig   gcc
i386                             allyesconfig   gcc
i386         buildonly-randconfig-001-20231005   gcc
i386         buildonly-randconfig-002-20231005   gcc
i386         buildonly-randconfig-003-20231005   gcc
i386         buildonly-randconfig-004-20231005   gcc
i386         buildonly-randconfig-005-20231005   gcc
i386         buildonly-randconfig-006-20231005   gcc
i386                              debian-10.3   gcc
i386                                defconfig   gcc
i386                  randconfig-001-20231005   gcc
i386                  randconfig-002-20231005   gcc
i386                  randconfig-003-20231005   gcc
i386                  randconfig-004-20231005   gcc
i386                  randconfig-005-20231005   gcc
i386                  randconfig-006-20231005   gcc

and

x86_64                            allnoconfig   gcc
x86_64                           allyesconfig   gcc
x86_64                              defconfig   gcc
x86_64                randconfig-001-20231005   gcc
x86_64                randconfig-002-20231005   gcc
x86_64                randconfig-003-20231005   gcc
x86_64                randconfig-004-20231005   gcc
x86_64                randconfig-005-20231005   gcc
x86_64                randconfig-006-20231005   gcc
x86_64                          rhel-8.3-rust   clang
x86_64                               rhel-8.3   gcc

are of interest to me. Assuming they are built with gcc-12, I wouldn't
immediately blame the compiler for the failure. Due to the nature of
the change, perhaps a weakness in the kernel has been found with some
obscure config setting. As said, my default Fedora 39 kernel (6.5.5),
built with gcc-13 works without any problems.

Also, does a successful report from yesterday [1] mean everything was OK?

[1] https://lore.kernel.org/lkml/202310060322.yeZgaj6Q-lkp@intel.com/

Uros.