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bh=z8zQ3DV6kVdH1EBgGF8C9Gj7Mc7Ct1Jy360SzFGTF10=; b=C12SEQPp3M4biYn0gnAjftxkvRaBX+31fRu5n2bfwuKs6xRXIwuS7PkEsXz9BzBOWXN6J2 P6EXbUaDCEUAH3AhwC2EwXcRCNvCaP8gXY9znHU7ADxEUUx1vbUsAfGaTZVagxcnurneRx UWfscsipRwU2rbiuk6yw2wVYJCL9Oj4= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1789039892; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=z8zQ3DV6kVdH1EBgGF8C9Gj7Mc7Ct1Jy360SzFGTF10=; b=i8+bC40hRj+KcYL9q977/CeHCyafG6ZlRxynqEdts7Y1yVTqlg1kQdHAXqHQG1MFtvXehI dMdigYx5BoEg0+CQ== Date: Thu, 10 Sep 2026 13:31:31 +0200 From: Michal =?iso-8859-1?Q?Such=E1nek?= To: Christian Zigotzky Cc: Shrikanth Hegde , Christophe Leroy , linuxppc-dev , kvm-ppc@vger.kernel.org, Madhavan Srinivasan , Peter Zijlstra , "R.T.Dickinson" , hypexed@yahoo.com.au, mad skateman , Christian Zigotzky Subject: Re: [Linux PPC] Disable PREEMPT Message-ID: References: <1D6F66F5-E181-4814-A7E5-E52A678D37A2@xenosoft.de> 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 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Rspamd-Queue-Id: 2806021B58 X-Spamd-Result: default: False [11.71 / 50.00]; SPAM_FLAG(5.00)[]; NEURAL_SPAM_LONG(3.50)[1.000]; BAYES_HAM(-3.00)[99.99%]; HFILTER_HOSTNAME_UNKNOWN(2.50)[]; RDNS_NONE(2.00)[]; ONCE_RECEIVED(1.20)[]; DWL_DNSWL_LOW(-1.00)[suse.de:dkim]; HFILTER_HELO_IP_A(1.00)[kunlun.suse.cz]; R_MIXED_CHARSET(0.63)[subject]; HFILTER_HELO_NORES_A_OR_MX(0.30)[kunlun.suse.cz]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.11)[-0.543]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b306:2000::2:from]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; FREEMAIL_ENVRCPT(0.00)[xtra.co.nz,yahoo.com.au,gmail.com]; FREEMAIL_CC(0.00)[linux.ibm.com,kernel.org,lists.ozlabs.org,vger.kernel.org,infradead.org,xtra.co.nz,yahoo.com.au,gmail.com,xenosoft.de]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCPT_COUNT_SEVEN(0.00)[11]; MISSING_XM_UA(0.00)[]; RCVD_COUNT_ZERO(0.00)[0]; DKIM_TRACE(0.00)[suse.de:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:email,kunlun.suse.cz:mid,kunlun.suse.cz:helo] X-Spamd-Bar: +++++++++++ On Thu, Sep 10, 2026 at 12:31:09PM +0200, Michal Suchánek wrote: > On Thu, Sep 10, 2026 at 10:54:07AM +0200, Michal Suchánek wrote: > > On Mon, Sep 07, 2026 at 01:32:18PM +0200, Christian Zigotzky wrote: > > > On 07 September 2026 at 10:51 am, Michal Suchánek wrote: > > > > > > There is the obvious question which I did not notice answered in this > > > thread: Did you set up sysrq and/or kdump and find out where the kernel > > > is stuck? > > > > > > Thanks > > > > > > Michal > > > > > > - - - > > > > > > I think I need kexec for kdump due to the system freezing after activating of KVM HV. Unfortunately kexec doesn’t work on my machines. > > > > > > Further information: https://github.com/chzigotzky/kernels/releases/tag/Kexec > > > > So there is some bug with kexec initialization on your platform. > > Right, you are missing this part: > https://github.com/torvalds/linux/blob/50d05c7c76c96b90462f24debacca971d2e86713/arch/powerpc/kexec/core.c#L205 > > Maybe it needs to be called from your platform code or something. Lookig at the code it likely runs always but if your device tree does not have a /chosen node it does not add the property that kexec needs to load the kernel. Can you try adding a /chosen node to your device tree? Thanks Michal > > Thanks > > Michal > > > > > Sysrg for dumping stacks to console might still work. > > > > Thanks > > > > Michal > > >