linux-kernel - Re: [tip:locking/urgent] [jump_label] de752774f3: kernel_BUG_at_arch/x86/kernel/jump

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Message-ID: <a0d77ee7-ff3c-4c63-903c-e7c9e2fb70c7@gmail.com>
Date: Tue, 10 Sep 2024 11:40:54 +0200
From: Klara Modin <klarasmodin@...il.com>
To: Peter Zijlstra <peterz@...radead.org>,
 kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
 x86@...nel.org, "Darrick J. Wong" <djwong@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [tip:locking/urgent] [jump_label] de752774f3:
 kernel_BUG_at_arch/x86/kernel/jump_label.c

On 2024-09-10 11:39, Klara Modin wrote:
> Hi,
> 
> On 2024-09-09 12:56, Peter Zijlstra wrote:
>> On Mon, Sep 09, 2024 at 11:15:31AM +0200, Peter Zijlstra wrote:
>>> On Sun, Sep 08, 2024 at 09:06:55PM +0800, kernel test robot wrote:
>>>>
>>>>
>>>> Hello,
>>>>
>>>> kernel test robot noticed 
>>>> "kernel_BUG_at_arch/x86/kernel/jump_label.c" on:
>>>>
>>>> commit: de752774f38bb766941ed1bf910ba5a9f6cc6bf7 ("jump_label: Fix 
>>>> static_key_slow_dec() yet again")
>>>> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git locking/urgent
>>>>
>>>> in testcase: boot
>>>>
>>>> compiler: clang-18
>>>> test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 
>>>> -m 16G
>>>>
>>>
>>>> The kernel config and materials to reproduce are available at:
>>>> https://download.01.org/0day-ci/archive/20240908/202409082005.393050e2-oliver.sang@intel.com
>>>
>>> So the whole thing actually boots and works on my real machine, so I had
>>> to resort to using this qemu nonsense, as such I did as instructed in
>>> the reproduce file.
>>>
>>> I build the thing using clang-17 (for some reason debian is shitting
>>> itself trying to install clang-18 on this machine and I don't want to
>>> spend the day fighting that).
>>>
>>> Except, once I do:
>>>
>>>    bin/lkp qemu -k /usr/src/linux-2.6/tmp-build/arch/x86/boot/bzImage 
>>> -m /usr/src/linux-2.6/tmp-build/mod/modules.cgz job-script
>>>
>>> The whole thing grinds to a halt like so:
>>
>> Since I'm not able to reproduce, could you please run the thing against:
>>
>>    git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git 
>> locking/urgent
>>
>> and see what that does?
>>
> 
> I hit this bug on today's next. Reverting 
> de752774f38bb766941ed1bf910ba5a9f6cc6bf7 and applying the updated 
> version (6b01e5a8c11611a3dbd3d9efd915427cbce9352a) fixed it for me.
> 
> Thanks,
> Tested-by: Klara Modin <klarasmodin@...il.com>

Sorry, this should now be from my usual email.