From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.zytor.com (terminus.zytor.com [198.137.202.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DEE162441B8 for ; Wed, 28 May 2025 07:27:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.136 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748417243; cv=none; b=jAtba15FRaz3Vji4sbUx2Id+rbb4Kaeo8eRl+CA9MkFqsgml4aOkawcenktiDfgS8xRpyOf/r1GbPzDgh0SV9cP0+vLi4N0CpdMyMkey/GA+pIdb7J4oSg5wXT9Z/vt5tHUEH7v1mfyFLYBpczqZkvIB33X8oste8owZzUC+fY4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748417243; c=relaxed/simple; bh=q3ipiG40ThaQgjCewnUf0HRdkGThNY0ak2qE3NeutnI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=hncbxjQMwSmaKCsjiwahAFv4/Us8rGUvjS/35xYRUgI+CiCWsiHijn+LL/uO774rQCBJWS0vmigOJ/ZNaJhdZeDCC5aZ78jXnbyHqKItzHl1HNMq67OOH53Lo8J5MwqfAb0W8U1BtwyC0zTJJflHeZ+o14u3eq25pXOPQUBANbY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com; spf=pass smtp.mailfrom=zytor.com; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b=uSGhOrO9; arc=none smtp.client-ip=198.137.202.136 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zytor.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="uSGhOrO9" Received: from [192.168.7.202] ([71.202.166.45]) (authenticated bits=0) by mail.zytor.com (8.18.1/8.17.1) with ESMTPSA id 54S7R7V41356702 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Wed, 28 May 2025 00:27:08 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 54S7R7V41356702 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2025052101; t=1748417229; bh=VPrzUtsVMMbLadQDJ1iIsSVR/fVdgSl/IiC7/EzNeZA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=uSGhOrO9u1YOYDMh/smcX1t1I31hu/A5qQPdnpc9uJ2rtJuQ7X23WLMRTFhP2WcGf +k4Ez6R4iLZ2DEoyKhyeZ6HecyVXWX7K2GSrD+wyhtQf00FyIWAeg+GWiPR2bqM7ZW etKHXGfBe60dH9s7azH1WpVJEiTrfhpedk1Ixpl6+zRHOKun81v+mZ6l8OuYpxE240 jyotTVIGw5ulE1+Blj3jHLOWiBO67zJCF7yZJQgUxdq6Y0oHEv9rLsurxhPyRO6WXl 1zS4eHKV97d/1PMpw3nhnr34i2/hJ3veWNyJrzkBUFPnXTr7NzIyHtlTb0V7iZv08x Yd1Df30/TlRJw== Message-ID: <1226c371-5d44-4206-973f-3c10152c4195@zytor.com> Date: Wed, 28 May 2025 00:27:06 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17 To: Juergen Gross Cc: Gupta Pawan , linux-kernel@vger.kernel.org, x86@kernel.org, Zijlstra Peter , Hansen Dave , alexandre.chartre@oracle.com, Andrew Cooper , Zhang Tao1 References: <607917bc-6788-425a-8051-181a078ddb49@suse.com> <081152ba-79b5-477e-8248-02bf289ff9ce@citrix.com> <227db775-f4ce-4dd3-ba14-30232ab3ab6f@suse.com> <1b8e565e-2ed6-4f1d-9138-fbf12662c404@suse.com> Content-Language: en-US From: Xin Li Autocrypt: addr=xin@zytor.com; keydata= xsDNBGUPz1cBDACS/9yOJGojBFPxFt0OfTWuMl0uSgpwk37uRrFPTTLw4BaxhlFL0bjs6q+0 2OfG34R+a0ZCuj5c9vggUMoOLdDyA7yPVAJU0OX6lqpg6z/kyQg3t4jvajG6aCgwSDx5Kzg5 Rj3AXl8k2wb0jdqRB4RvaOPFiHNGgXCs5Pkux/qr0laeFIpzMKMootGa4kfURgPhRzUaM1vy bsMsL8vpJtGUmitrSqe5dVNBH00whLtPFM7IbzKURPUOkRRiusFAsw0a1ztCgoFczq6VfAVu raTye0L/VXwZd+aGi401V2tLsAHxxckRi9p3mc0jExPc60joK+aZPy6amwSCy5kAJ/AboYtY VmKIGKx1yx8POy6m+1lZ8C0q9b8eJ8kWPAR78PgT37FQWKYS1uAroG2wLdK7FiIEpPhCD+zH wlslo2ETbdKjrLIPNehQCOWrT32k8vFNEMLP5G/mmjfNj5sEf3IOKgMTMVl9AFjsINLHcxEQ 6T8nGbX/n3msP6A36FDfdSEAEQEAAc0WWGluIExpIDx4aW5Aenl0b3IuY29tPsLBDQQTAQgA NxYhBIUq/WFSDTiOvUIqv2u9DlcdrjdRBQJlD89XBQkFo5qAAhsDBAsJCAcFFQgJCgsFFgID AQAACgkQa70OVx2uN1HUpgv/cM2fsFCQodLArMTX5nt9yqAWgA5t1srri6EgS8W3F+3Kitge tYTBKu6j5BXuXaX3vyfCm+zajDJN77JHuYnpcKKr13VcZi1Swv6Jx1u0II8DOmoDYLb1Q2ZW v83W55fOWJ2g72x/UjVJBQ0sVjAngazU3ckc0TeNQlkcpSVGa/qBIHLfZraWtdrNAQT4A1fa sWGuJrChBFhtKbYXbUCu9AoYmmbQnsx2EWoJy3h7OjtfFapJbPZql+no5AJ3Mk9eE5oWyLH+ QWqtOeJM7kKvn/dBudokFSNhDUw06e7EoVPSJyUIMbYtUO7g2+Atu44G/EPP0yV0J4lRO6EA wYRXff7+I1jIWEHpj5EFVYO6SmBg7zF2illHEW31JAPtdDLDHYcZDfS41caEKOQIPsdzQkaQ oW2hchcjcMPAfyhhRzUpVHLPxLCetP8vrVhTvnaZUo0xaVYb3+wjP+D5j/3+hwblu2agPsaE vgVbZ8Fx3TUxUPCAdr/p73DGg57oHjgezsDNBGUPz1gBDAD4Mg7hMFRQqlzotcNSxatlAQNL MadLfUTFz8wUUa21LPLrHBkUwm8RujehJrzcVbPYwPXIO0uyL/F///CogMNx7Iwo6by43KOy g89wVFhyy237EY76j1lVfLzcMYmjBoTH95fJC/lVb5Whxil6KjSN/R/y3jfG1dPXfwAuZ/4N cMoOslWkfZKJeEut5aZTRepKKF54T5r49H9F7OFLyxrC/uI9UDttWqMxcWyCkHh0v1Di8176 jjYRNTrGEfYfGxSp+3jYL3PoNceIMkqM9haXjjGl0W1B4BidK1LVYBNov0rTEzyr0a1riUrp Qk+6z/LHxCM9lFFXnqH7KWeToTOPQebD2B/Ah5CZlft41i8L6LOF/LCuDBuYlu/fI2nuCc8d m4wwtkou1Y/kIwbEsE/6RQwRXUZhzO6llfoN96Fczr/RwvPIK5SVMixqWq4QGFAyK0m/1ap4 bhIRrdCLVQcgU4glo17vqfEaRcTW5SgX+pGs4KIPPBE5J/ABD6pBnUUAEQEAAcLA/AQYAQgA JhYhBIUq/WFSDTiOvUIqv2u9DlcdrjdRBQJlD89ZBQkFo5qAAhsMAAoJEGu9DlcdrjdR4C0L /RcjolEjoZW8VsyxWtXazQPnaRvzZ4vhmGOsCPr2BPtMlSwDzTlri8BBG1/3t/DNK4JLuwEj OAIE3fkkm+UG4Kjud6aNeraDI52DRVCSx6xff3bjmJsJJMb12mWglN6LjdF6K+PE+OTJUh2F dOhslN5C2kgl0dvUuevwMgQF3IljLmi/6APKYJHjkJpu1E6luZec/lRbetHuNFtbh3xgFIJx 2RpgVDP4xB3f8r0I+y6ua+p7fgOjDLyoFjubRGed0Be45JJQEn7A3CSb6Xu7NYobnxfkwAGZ Q81a2XtvNS7Aj6NWVoOQB5KbM4yosO5+Me1V1SkX2jlnn26JPEvbV3KRFcwV5RnDxm4OQTSk PYbAkjBbm+tuJ/Sm+5Yp5T/BnKz21FoCS8uvTiziHj2H7Cuekn6F8EYhegONm+RVg3vikOpn gao85i4HwQTK9/D1wgJIQkdwWXVMZ6q/OALaBp82vQ2U9sjTyFXgDjglgh00VRAHP7u1Rcu4 l75w1xInsg== In-Reply-To: <1b8e565e-2ed6-4f1d-9138-fbf12662c404@suse.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 5/27/2025 11:49 PM, Juergen Gross wrote: > On 28.05.25 07:11, Jürgen Groß wrote: >> On 27.05.25 21:29, Andrew Cooper wrote: >>> On 27/05/2025 8:21 pm, Xin Li wrote: >>>>> On May 27, 2025, at 11:36 AM, Jürgen Groß wrote: >>>>> >>>>> On 27.05.25 19:54, Xin Li wrote: >>>>>> On 5/27/2025 10:46 AM, Pawan Gupta wrote: >>>>>>>> Attached is the serial console log and my kernel config. >>>>>>> Serial logs aren't telling much. I do not have a Xen setup to >>>>>>> test, without >>>>>>> Xen the config that you provided is booting a KVM guest just fine. >>>>>> Yeah, as I replied to Juergen, the same kernel binary boots fine as >>>>>> "native". >>>>>> Unfortunately when booting as dom0 on Xen, it keeps rebooting w/o >>>>>> helpful log. >>>>> What about booting Xen on bare metal, i.e. no KVM being involved? >>>> The same exact problem happens on Intel Simics.  And I got to see >>>> it’s a NX page fault in dom0 kernel during apply alternatives. >>> >>> In which case it's likely that there's an opencoded PTE update, rather >>> than using the hooks (which are suitably paravirt'd). >> >> I'd suspect a bug when NOT using 2M pages for execmem. >> >> I'll have a look. > > Could you have a try using "nohugevmalloc" dom0 kernel boot parameter? > Tried in a KVM guest, still the same problem, and nothing new in the serial log. Thanks! Xin