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a=ed25519-sha256; c=relaxed/relaxed; t=1793869599; s=strato-dkim-0003; d=xenosoft.de; h=To:In-Reply-To:Cc:References:Message-Id:Date:Subject:From:Cc:Date: From:Subject:Sender; bh=vdDDMtXuZcI5ST0g2B/YWhJgrol3S1EgLV5st/yxsdo=; b=en/3zAniDl/LRIYdJeFvnBVq9POSUfDTctQmwnz3zQuR6FUVZFgGH6l0EwGAS1Nuj8 VxlbZITG9NIuwm3RdpCw== X-RZG-AUTH: ":L2QefEenb+UdBJSdRCXu93KJ1bmSGnhMdmOod1DhGN0rBVhd9dFr6KxrfO5Oh7V7X5i1s3mVDnvabcnE8Xz5iRUIWLwPs9mBpLTTaXc=" Received: from smtpclient.apple by smtp.strato.de (RZmta 55.6.3 AUTH) with ESMTPSA id e825d92A596cO07 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Thu, 5 Nov 2026 10:06:38 +0100 (CET) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Christian Zigotzky X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 (1.0) Subject: Re: [PATCH 1/2] KVM: PPC: BookE: Disable preemption before loading guest FP and Altivec Date: Thu, 5 Nov 2026 10:06:27 +0100 Message-Id: <4FED0F6E-890F-4482-99F3-39D7520C48FE@xenosoft.de> References: Cc: Ritesh Harjani , Narayana Murty N , maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, msuchanek@suse.de, harshpb@linux.ibm.com, gautam@linux.ibm.com, amachhiw@linux.ibm.com, venkat88@linux.ibm.com, "R.T.Dickinson" , mad skateman , Damien Stewart , Christian Zigotzky In-Reply-To: To: Shrikanth Hegde X-Mailer: iPhone Mail (24B119) On 02 November 2026 at 2:07 pm, Shrikanth Hegde wrot= e: =EF=BB=BFHi. On 11/1/26 1:58 PM, Christian Zigotzky wrote: Yes, I can help with testing. - - - Thanks Christian. - - - Hi all, Ever since we enabled PREEMPT on our Nemo boards [1], we have been experienc= ing occasional problems with the kernel stack. Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: s= rcu_gp_start_if_needed+0x534/0x538 Rebooting in 180 seconds.. We are using the following patches: [2] [3] We have disabled PREEMPT with a patch [4] again, and since then our Nemo boa= rds have been running perfectly once more. As the problem with the kernel stack only occurs sporadically, bisection is i= mpossible. I hope you can fix the kernel stack issue. Thanks, Christian [1] https://en.wikipedia.org/wiki/AmigaOne_X1000 [2] https://raw.githubusercontent.com/chzigotzky/kernels/refs/heads/main/pat= ches/X1000/preempt_v1.patch [3] https://raw.githubusercontent.com/chzigotzky/kernels/refs/heads/main/pat= ches/X1000/kvm_powerpc.patch [4] https://raw.githubusercontent.com/chzigotzky/kernels/refs/heads/main/pat= ches/X1000/Kconfig.preempt.patch [5] Kernel config: https://raw.githubusercontent.com/chzigotzky/kernels/31c0= 64092e3aab0875c47d44838443c9515b2970/configs/x1000_defconfig