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Tue, 29 Sep 2026 11:08:56 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 68TB8tYl38338828 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 29 Sep 2026 11:08:55 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EF2CA2004B; Tue, 29 Sep 2026 11:08:54 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1FD6F20040; Tue, 29 Sep 2026 11:08:54 +0000 (GMT) Received: from fedora (unknown [9.5.7.39]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTPS; Tue, 29 Sep 2026 11:08:53 +0000 (GMT) Date: Tue, 29 Sep 2026 16:39:05 +0530 From: Amit Machhiwal To: Michal =?utf-8?B?U3VjaMOhbmVr?= Cc: linuxppc-dev , kvm-ppc@vger.kernel.org Subject: Re: early boot crash in init_tracer_tracefs Message-ID: <20260929163751.4923b819-9f-amachhiw@linux.ibm.com> Mail-Followup-To: Michal =?utf-8?B?U3VjaMOhbmVr?= , linuxppc-dev , kvm-ppc@vger.kernel.org References: <20260928111234.faec09f7-8d-amachhiw@linux.ibm.com> <20260929093245.00008c9b-10-amachhiw@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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI5MDA0NCBTYWx0ZWRfXwaQHaRlZaBvM GwnpTl3vfDk3yWlr0RvP9BAa9GuDDlWgv+/jAECObjyo7KIwTygeq/J3Mki5XWLWwDuCS6nBtC5 8ZoXtV0uN+q+0YsYV3v+RMsEDofE71B1gSnnwDYdxr86XJa9TYSMT/2mrPndslnRKYMo08Di48K TfyI0BakfvKbwzxnp8AGxdQ9pOM5po4coqMZRxk2GbPxK5izm0Gz27uUWPPEVvypKZ/wufIbzIs JDaKlQ0z73+T2z8vbRGzn6FQucKQoSQjm9lB6JkFz/wvu0u/fgRVh7/TBcqlKqJERPp/xVmJT2X DIwG/7E/oYIdhu6dImlOBw1bYaaA9ERB3mNzqovfH1Ovf09wxv72XdGHgMZrjdS/FJxKyfJDqLV Ti1NkF+srA7keA67Hc5x4G4dvL5ky0qyXY4NMl+y96n9vgSvhnR3Z7G4/x0qxqSAUa7j4AGUaeK pk4C0HA46OzdFa6Toxg== X-Authority-Analysis: v=2.4 cv=SPbXx+vH c=1 sm=1 tr=0 ts=6abb9c4a cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=8nJEP1OIZ-IA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=NEAV23lmAAAA:8 a=VLc2VSdLAAAA:20 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=6VyZ6CMpfp4q-7wJFy8A:9 a=3ZKOabzyN94A:10 a=wPNLvfGTeEIA:10 a=bA3UWDv6hWIuX7UZL3qL:22 X-Proofpoint-ORIG-GUID: cLzbJ0OqIQsP8M4LRgIhdYuaqXzvvokZ X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI5MDA0NCBTYWx0ZWRfX+SlOvbeMAJcs QNdpCFCU436LzVpKlra2HTXuBhmFk1UpNpNbgRTRZ32ObwdYeqz03l/4A+zh3BahZVPXCgg2kHP Ts2xCCt6BYY5Ks33SU8aCoWRbEAilYM= X-Proofpoint-GUID: cLzbJ0OqIQsP8M4LRgIhdYuaqXzvvokZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-29_04,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1015 spamscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 bulkscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609290044 On 2026/09/29 01:04 PM, Michal Suchánek wrote: > On Tue, Sep 29, 2026 at 09:36:05AM +0530, Amit Machhiwal wrote: > > On 2026/09/28 11:43 AM, Amit Machhiwal wrote: > > > Hi Michal, > > > > > > Thanks for the report. We have been looking at the crash and have some findings > > > and follow-up questions. > > > > > > On 2026/09/25 10:10 AM, Michal Suchánek wrote: > > > > Hello, > > > > > > > > There appears to be a regression between > > > > < snip > > > > > > > > > > > Linux 7.0.12 > > > > https://github.com/openSUSE/kernel/tree/4c9922875554ec191166ba6c0145f12d8ff9d4fc > > > > https://github.com/openSUSE/kernel-source/blob/2ebf0bc/config/ppc64le/default > > > > I have been trying to recreate the issue with this kernel and config but I > > haven't been able to. The L2 KVM guest boots fine everytime. > > > > In addition to the requested information, could you please also share your qemu > > cmdline/guest xml you used? > > The XML of the VM is below. What other information do you require? Thanks for sharing the guest XML. I had requested some more info [1]. Could you please share that? [1] https://lore.kernel.org/all/20260928111234.faec09f7-8d-amachhiw@linux.ibm.com/ Thanks, Amit