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Mon, 28 Apr 2025 05:09:17 +0000 (GMT) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 28 Apr 2025 10:39:16 +0530 From: Misbah Anjum N To: Ritesh Harjani Cc: christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, mpe@ellerman.id.au, naveen@kernel.org, npiggin@gmail.com Subject: Re: [BUG][powerpc] OOPs: Kernel access of bad area during zram swap write - kswapd0 crash In-Reply-To: <87ldrujhr5.fsf@gmail.com> References: <89bfdedb74416156423d36d28c5b92e9@linux.ibm.com> <87ldrujhr5.fsf@gmail.com> Message-ID: X-Sender: misanjum@linux.ibm.com Organization: IBM Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: wsIDt46e0tVfdjVz3Zr7Uo-7ay9M-Yen X-Authority-Analysis: v=2.4 cv=C4/pyRP+ c=1 sm=1 tr=0 ts=680f0d81 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=kj9zAlcOel0A:10 a=XR8D0OoHHMoA:10 a=NEAV23lmAAAA:8 a=09Uxs5wTwXsWUI50y4oA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-ORIG-GUID: o_Ee4r_eH4VpeaGAGKu0gvRZHrPdlGhU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNDI4MDA0MSBTYWx0ZWRfXyPTdSNEfU8ST hup4A1NYpNG0OsEtWzTLFajrs+swh095bfGS6z/uvvzEkq9jKClNEgDQqoAkBCFf7Erfe4nNIiA ca/BXl4A3ww7M4yUPkoBT45re6CnD7IjRPnW6IMXX3ysvZCiG5ukZqSyi4+c9cnjcfXuYfycEt4 sNLV7qp77Jkwilzq4VCSjypW4EDJXFww6LBPf6tlg2yisWUwUfOWnfhMGrdeEaLYlZPCQ2copr+ M1hg/0uD8/8ypDlxfXiopz2xjWZ+3+COnOpHinAMD9JmKUJpe7PAFHwqh494VBkh0GtcJOiS6Ja QvTxMFtKhe056C3hjLwU5VsaRw4hTJ9ZJuVJiFIUrahTA6pSzpYmuswByhQWzejAExG4aBgQGC+ ucJIYpj9BoAH4FmluPq8VzDAJdzNP5yJH8HNWZkkuCw0un1vfrh/nuXlnwP/6MIw6Q7lgICm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-04-28_01,2025-04-24_02,2025-02-21_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 impostorscore=0 malwarescore=0 adultscore=0 phishscore=0 clxscore=1011 priorityscore=1501 mlxscore=0 suspectscore=0 bulkscore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2504070000 definitions=main-2504280041 On 2025-04-21 09:19, Ritesh Harjani wrote: > Looks like the issue is happening on 6.15-rc2. Did git bisect revealed > a > faulty commit? > > Looks like zsmalloc new object mapping API being called, which was > merged in rc1? But let's first confirm from git bisect, unless someone > from linux-mm who knows zsmalloc subsystem better and can point on what > could be going wrong here. > > -ritesh Hi, Regarding the issue, I am currently running tests by removing the suspected faulty commit. Unfortunately, git bisect is not feasible in this case because recreating the bug requires running the avocado bucket for approximately two days. Hence, I am resetting the kernel to the commit prior to: 44f76413496ec343da0d8292ceecdcabe3e6ec16 and manually running the bucket to come to conclusions. The commit in question: 44f76413496ec343da0d8292ceecdcabe3e6ec16 introduces zsmalloc - new object mapping API More information: https://github.com/torvalds/linux/commit/44f76413496ec343da0d8292ceecdcabe3e6ec16 I will update the upstream bug report with this information after performing the tests. Thank you, Misbah Anjum N