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Mon, 28 Apr 2025 05:09:18 GMT Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9268B58064; Mon, 28 Apr 2025 05:09:17 +0000 (GMT) Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 224875805E; Mon, 28 Apr 2025 05:09:17 +0000 (GMT) Received: from ltc.linux.ibm.com (unknown [9.5.196.140]) by smtpav04.dal12v.mail.ibm.com (Postfix) with ESMTP; Mon, 28 Apr 2025 05:09:17 +0000 (GMT) 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; 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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