From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2BF23C61DD3 for ; Thu, 3 Sep 2026 11:40:22 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4hbHhh3qLrz2y2M; Thu, 03 Sep 2026 21:40:20 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=195.135.223.130 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1788435620; cv=none; b=E65a3snWmxsasdp1SVYEAZagBuS8jimNESL5kxYikQ6Fb9LPHZf6npF/VPcNKXYHXMHlrsZy+ZjJbtQvjsmsYzkgT2Q/mSjMZLZDuj8eo+siGEwPNxMlabo6bJ8Y2k4VBHzg2CNXIcfkYNbD4sjFfweBTa7PxEKIpF4/sL+Ma2geAzpX0ywAqi+EFzeRumerjAbSbqDmF/9Ssdhwbq0a3wYQ1CUcuUq1Vd+yrpxLg19XXO2BacES1qOEqwDs3HbJWT/dUVAm4OFjHhFB8gkc5fYQ65h89e6vLXNf2aTlMSnzdnwx1Gaqhd7uwSQ+soL9WZoU1GW3Y6gJnZCEAjK3Gg== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1788435620; c=relaxed/relaxed; bh=kx+VQYkw50+lZ7qefIhUB7RL8P7U7SFh64042kGUciw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=La3Agkh5oTytrA83sm71ujW/fEksr/J8Z2BwbSmTEtvZ9/QuaRiKDHfaewF2x3uwTpwkoY+Fuhjyvnw9j7naMAdthitJptkc/Fl+bHw0tDzg5tvZYwPkY0T8rpbXHU8mP1IPADMX+7+l7pySX2vYbI4YMSY6ljgexEcMnYr8wq9pX9bNLlaYWdRebD88BzCpRWo4xSe3n9a4kAaWK9IntKP9fW8/YKKKFfXg+mRmkvvoCOWUwODQQ+VVI9oQw1r/rgIMtbv7RoTJ3sHVmIiy1pzZEZDg4c0RMiBRxAUicu5zPAHr45cbaFoXlmto1B8eUw1GuDGBzLADBjvphXCCYw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=suse.de; dkim=pass (1024-bit key; unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=XbR/bSzq; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=PyJpLHw7; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=Jfa8fVOU; dkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=kEvPCYq+; dkim-atps=neutral; spf=pass (client-ip=195.135.223.130; helo=smtp-out1.suse.de; envelope-from=msuchanek@suse.de; receiver=lists.ozlabs.org) smtp.mailfrom=suse.de Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=XbR/bSzq; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=PyJpLHw7; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=Jfa8fVOU; dkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=kEvPCYq+; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=suse.de (client-ip=195.135.223.130; helo=smtp-out1.suse.de; envelope-from=msuchanek@suse.de; receiver=lists.ozlabs.org) Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4hbHhg1m1Yz2xl6 for ; Thu, 03 Sep 2026 21:40:18 +1000 (AEST) Received: from kunlun.suse.cz (unknown [IPv6:2a07:de40:b306:2000::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 6119C21EA8; Thu, 3 Sep 2026 11:40:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1788435611; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=kx+VQYkw50+lZ7qefIhUB7RL8P7U7SFh64042kGUciw=; b=XbR/bSzqjESXfTFZ4Tp402s5nnFx5rpk+Du645yM+7/B0vu3hJG4M4SziD0KZPm76VU1Wi X0GelMnNqSI3a9FQbE9Esa6eHGu1fIG27+RZx3u/CIq4DMEnZPlCNTT52apLItBsrOpL6h IzqEKW0onq2pdNdhSNJdaNZhUPL4Rf4= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1788435611; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=kx+VQYkw50+lZ7qefIhUB7RL8P7U7SFh64042kGUciw=; b=PyJpLHw7cS96Llf2riq0iiE4V//xmg4kue5nVVTLYQhf2/ld5XK7CvkBV7vbZviA7LqFss GboD+UfZK1jXJGAw== Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=Jfa8fVOU; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=kEvPCYq+ DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1788435607; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=kx+VQYkw50+lZ7qefIhUB7RL8P7U7SFh64042kGUciw=; b=Jfa8fVOUDuU3ITVp2i9dUGisekJ57u9xtAxGG65WxKC7RyuyZfhaeq8e4X1o+Q50HMt2uH BPHJevsJ7qxAoWJCK+yLaTHLr9AlrlMbFhouWz2YG+38H1Pj9CpohtW4DlbbO/NKKTW7rx 0Xn0ZiKBP/noTtc8B2kzD6PRem+sO2M= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1788435607; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=kx+VQYkw50+lZ7qefIhUB7RL8P7U7SFh64042kGUciw=; b=kEvPCYq+1HPLm8Gn3WTca2/XjidcB6CruFpbnfIJvqZnOa99XUMFt1qWJe39YOjvjDVX21 uVFi5HOBIhujKgAA== Date: Thu, 3 Sep 2026 13:40:06 +0200 From: Michal =?iso-8859-1?Q?Such=E1nek?= To: Shrikanth Hegde Cc: "Christophe Leroy (CS GROUP)" , Christian Zigotzky , 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: <2a27e6fc-7eb4-41a5-ba88-58f6a22625b5@xenosoft.de> <1d79ec6f-ce7f-4432-80e0-a54fa1668642@linux.ibm.com> <1c9b879a-7907-4849-a416-5df3db5617d6@kernel.org> <34112e67-85a5-a380-a42b-24c6562d65be@xenosoft.de> <8c6f2510-1dc5-4c45-9288-6b9c8f9b6b24@kernel.org> <9a58d944-405c-4519-852e-8fa04c22c2db@linux.ibm.com> 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=us-ascii Content-Disposition: inline In-Reply-To: X-Spamd-Bar: ++++++++++++ X-Rspamd-Queue-Id: 6119C21EA8 X-Rspamd-Action: add header X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [12.67 / 50.00]; SPAM_FLAG(5.00)[]; NEURAL_SPAM_LONG(3.50)[1.000]; BAYES_HAM(-3.00)[100.00%]; HFILTER_HOSTNAME_UNKNOWN(2.50)[]; RDNS_NONE(2.00)[]; ONCE_RECEIVED(1.20)[]; 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(-0.14)[-0.718]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_TRACE(0.00)[0:+]; TO_DN_EQ_ADDR_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[xtra.co.nz,yahoo.com.au,gmail.com]; FREEMAIL_CC(0.00)[kernel.org,xenosoft.de,lists.ozlabs.org,vger.kernel.org,linux.ibm.com,infradead.org,xtra.co.nz,yahoo.com.au,gmail.com]; 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] X-Spam: Yes On Thu, Sep 03, 2026 at 05:01:13PM +0530, Shrikanth Hegde wrote: > > > > > > > > This is not the latest kernel so it might have been fixed in the > > > > meantime for the platform in question. Will need to check that. > > > > > > > > > > If possible run against current upstream and share the results. > > > > https://github.com/openSUSE/kernel-source/blob/6824496d1801f73def615dca8794202eeb7b0d86/config/ppc64le/default > > > > [ 472.091531][ T6181] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: kvmhv_run_single_vcpu+0x19d4/0x1b50 [kvm_hv] > > [ 472.091598][ T6181] CPU: 29 UID: 107 PID: 6181 Comm: CPU 112/KVM Not tainted 7.2.2-5.g6824496-default #1 PREEMPT(full) openSUSE Tumbleweed (unreleased) 61871a5f06863b4006f5ef27cd9f18e8a7a2edad > > [ 472.091612][ T6181] Hardware name: IBM,9824-42A Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.20 (OB1110_130) hv:phyp pSeries > > [ 472.091624][ T6181] Call Trace: > > [ 472.091630][ T6181] [c00000000fdfb680] [c00000000134ce90] dump_stack_lvl+0x84/0xc0 (unreliable) > > [ 472.091653][ T6181] [c00000000fdfb6b0] [c00000000022e7c8] vpanic+0x324/0x5e4 > > [ 472.091666][ T6181] [c00000000fdfb760] [c00000000022eac4] do_panic_on_target_cpu+0x0/0x2c > > [ 472.091677][ T6181] [c00000000fdfb780] [c0000000013c1ff8] __stack_chk_fail+0x48/0x60 > > [ 472.091689][ T6181] [c00000000fdfb7f0] [c00800001aae219c] kvmhv_run_single_vcpu+0x19d4/0x1b50 [kvm_hv] > > [ 472.091712][ T6181] [c00000000fdfb940] [c00800001aae24b4] kvmppc_vcpu_run_hv+0x19c/0x12f0 [kvm_hv] > > [ 472.091732][ T6181] [c00000000fdfba10] [c00800001aeeed18] kvmppc_vcpu_run+0x30/0x48 [kvm] > > [ 472.091779][ T6181] [c00000000fdfba30] [c00800001aee9ef4] kvm_arch_vcpu_ioctl_run+0x35c/0x4a0 [kvm] > > [ 472.091813][ T6181] [c00000000fdfbac0] [c00800001aedaac4] kvm_vcpu_ioctl+0x1ac/0xad8 [kvm] > > [ 472.091844][ T6181] [c00000000fdfbca0] [c0000000007f1244] sys_ioctl+0x374/0x1060 > > [ 472.091857][ T6181] [c00000000fdfbdb0] [c00000000002f7f8] system_call_exception+0x188/0x430 > > [ 472.091871][ T6181] [c00000000fdfbe50] [c00000000000cfdc] system_call_vectored_common+0x15c/0x2ec > > [ 472.091886][ T6181] ---- interrupt: 3000 at 0x7fffb5565fac > > [ 472.091896][ T6181] NIP: 00007fffb5565fac LR: 00007fffb5565fac CTR: 0000000000000000 > > [ 472.091904][ T6181] REGS: c00000000fdfbe80 TRAP: 3000 Not tainted (7.2.2-5.g6824496-default) > > [ 472.091911][ T6181] MSR: 800000000280f033 CR: 42044402 XER: 00000000 > > [ 472.091938][ T6181] IRQMASK: 0 > > [ 472.091938][ T6181] GPR00: 0000000000000036 00007fbfa77ed7a0 00007fffb5677100 00000000000000fa > > [ 472.091938][ T6181] GPR04: 000000002000ae80 0000000000000000 0000000000000000 0000000000000000 > > [ 472.091938][ T6181] GPR08: 00000000000000fa 0000000000000000 0000000000000000 0000000000000000 > > [ 472.091938][ T6181] GPR12: 0000000000000000 00007fbfa77f5ec0 000000014676f000 00007fbfa77ee7c0 > > [ 472.091938][ T6181] GPR16: 000000014674e8d0 00007fbfa77eeec0 00007fbfa77eeec0 fffffffffffffff7 > > [ 472.091938][ T6181] GPR20: 00007fffb71210d0 0000000000000001 00007fbfa77eeec0 0000000000000000 > > [ 472.091938][ T6181] GPR24: 00007fbfa77ed8e8 0000000105971428 000000002000ae80 0000000105f77a70 > > [ 472.091938][ T6181] GPR28: 0000000000000000 0000000000000000 000000002000ae80 000000014674f000 > > [ 472.092020][ T6181] NIP [00007fffb5565fac] 0x7fffb5565fac > > [ 472.092027][ T6181] LR [00007fffb5565fac] 0x7fffb5565fac > > [ 472.092033][ T6181] ---- interrupt: 3000 > > [ 472.098256][ T6181] pstore: backend (nvram) writing error (-1) > > > > This is the host, cannot run the kernel as guest because it fails to boot most > > of the time inside KVM. > > > > Will look into. btw the patch shared i.e below patch fixes the boot hanf issue? > > https://lore.kernel.org/all/1d79ec6f-ce7f-4432-80e0-a54fa1668642@linux.ibm.com/ I would not bet on that. It looks like host side patch, and the problem is with booting 7.2.2 as guest. Some 6.12 frankenkernel can be booted on the same host, and used to produce the crash above by running a kernel build inside the guest. Thanks Michal