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a=ed25519-sha256; c=relaxed/relaxed; t=1789699200; s=strato-dkim-0003; d=xenosoft.de; h=In-Reply-To:Date:Message-ID:From:References:Cc:To:Subject:Cc:Date: From:Subject:Sender; bh=h7bgIghYy6rIQpeuTEPDhR0x4PHXDnfd0N0XviJQESk=; b=L1whxBc7v4TfxP1REiYartKLSNAuoxu2tpE8fD0tyIrLIjFQf1v48PLniKYf6N+x2q Of0Yi31hQ6GtkDMRmlAw== X-RZG-AUTH: ":L2QefEenb+UdBJSdRCXu93KJ1bmSGnhMdmOod1DhGN0rBVhd9dFr4thIFiqT9BURIy+m7R3g" Received: from void-ppc.a-eon.tld by smtp.strato.de (RZmta 55.6.2 DYNA|AUTH) with ESMTPSA id ee2bee28I2dwDK6 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Fri, 18 Sep 2026 04:39:58 +0200 (CEST) Subject: Re: [Linux PPC] Disable PREEMPT To: Shrikanth Hegde , =?UTF-8?Q?Michal_Such=c3=a1nek?= Cc: "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> From: Christian Zigotzky Organization: A-EON Open Source Message-ID: <7e06fb84-ca2e-dbb4-47bd-e95ee11113c9@xenosoft.de> Date: Fri, 18 Sep 2026 04:39:57 +0200 X-Mailer: BrassMonkey/34.3.2.1 Precedence: bulk X-Mailing-List: kvm-ppc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <7ad57b61-4567-42c8-a9f6-faaabe7766a7@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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. -- Christian -- 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)