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Sun, 20 Sep 2026 13:49:48 +0200 (CEST) Subject: Re: [Linux PPC] Disable PREEMPT To: =?UTF-8?Q?Michal_Such=c3=a1nek?= Cc: Shrikanth Hegde , "Christophe Leroy (CS GROUP)" , Michael Ellerman , harshpb@linux.ibm.com, Gautam Menghani , amachhiw@linux.ibm.com, linuxppc-dev , "kvm-ppc@vger.kernel.org" , Madhavan Srinivasan , Peter Zijlstra , "R.T.Dickinson" , hypexed@yahoo.com.au, mad skateman , Christian Zigotzky , Samir M , Venkat Rao Bagalkote , Narayana Murty N , Hari Bathini References: <25cf64ab-2a32-4d4c-a0c7-2e9007c276d4@linux.ibm.com> <9b58bd58-d0e4-463e-bff9-e33b153b2987@linux.ibm.com> <7ad57b61-4567-42c8-a9f6-faaabe7766a7@linux.ibm.com> <7e06fb84-ca2e-dbb4-47bd-e95ee11113c9@xenosoft.de> From: Christian Zigotzky Organization: A-EON Open Source Message-ID: <79f9d4e3-ce55-d238-e4a9-b11e9ce27c5f@xenosoft.de> Date: Sun, 20 Sep 2026 13:49:47 +0200 X-Mailer: BrassMonkey/34.3.2.1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 09/18/2026 09:10 AM, Michal Suchánek wrote: > On Fri, Sep 18, 2026 at 04:39:57AM +0200, Christian Zigotzky wrote: >> On 17/09/26 16:15, Shrikanth Hegde wrote: >>> Hi Michal, >>> >>>>> Give it a try. >>>>> >>>>> I am suspecting both lockup, stack corruptions are secondary >>>>> symptoms here. >>>>> While recreate, I have different type of traces. >>>> Yes, it does work for the crash I see. >>> Thanks. Give me sometime to see further on that. Didn't get any time >>> today. >>> >>>> However, we hijacked the report >>>> of KVM locking up on FSL Cyrus+, and that is likely a different problem >>>> still not addressed. >>>> >>> Ah, that's what you meant. Yes, i still don't know where FSL Cyrus+ is >>> stuck. >>> >>> I would need help from FSL Cyrus+ to get some logs or is there a way we >>> can spin of >>> a QEMU guest of it? We should have the log to start somewhere. >>> >>> >> It's difficult to get a log because it freezes and can't write any error >> messages to the log files. This bug is very old. We had this issue some >> years ago but we was able to disable PREEMPT because we don't need it. > I would expect serial console and sysrq could give something, depending > on how much of the kernel is frozen. > > Thanks > > Michal Here is a serial log: https://github.com/user-attachments/files/32433586/e5500_preempt_putty.log -- Sent with BrassMonkey 34.3.2.1 (https://github.com/chzigotzky/Web-Browsers-and-Suites-for-Linux-PPC/releases/tag/BrassMonkey_34.3.2.1)