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([2001:6b0:1:1041:b4e6:135d:cfae:1d65]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5365f870b71sm1059500e87.95.2024.09.10.02.40.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Sep 2024 02:40:55 -0700 (PDT) Message-ID: Date: Tue, 10 Sep 2024 11:40:54 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [tip:locking/urgent] [jump_label] de752774f3: kernel_BUG_at_arch/x86/kernel/jump_label.c From: Klara Modin To: Peter Zijlstra , kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org, "Darrick J. Wong" , Thomas Gleixner References: <202409082005.393050e2-oliver.sang@intel.com> <20240909091531.GA4723@noisy.programming.kicks-ass.net> <20240909105623.GH4928@noisy.programming.kicks-ass.net> <4a554ab4-b53b-485f-beef-96001100511a@kasm.eu> Content-Language: en-US In-Reply-To: <4a554ab4-b53b-485f-beef-96001100511a@kasm.eu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 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 Sorry, this should now be from my usual email.