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Tue, 17 Oct 2023 13:30:33 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D58B520040; Tue, 17 Oct 2023 13:30:32 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D10642004B; Tue, 17 Oct 2023 13:30:31 +0000 (GMT) Received: from smtpclient.apple (unknown [9.43.27.84]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 17 Oct 2023 13:30:31 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.100.2.1.4\)) Subject: Re: [powerpc] Kernel crash while running LTP (bisected) From: Sachin Sant In-Reply-To: <84a6c480-f29b-4a73-bbb0-4908145dc4db@lucifer.local> Date: Tue, 17 Oct 2023 19:00:20 +0530 Cc: linuxppc-dev , linux-mm@kvack.org, open list Content-Transfer-Encoding: quoted-printable Message-Id: <93251CB3-D144-44F5-A482-0051A398E643@linux.ibm.com> References: <81C9E2C1-DCC3-4DDD-8466-069893398B5B@linux.ibm.com> <84a6c480-f29b-4a73-bbb0-4908145dc4db@lucifer.local> To: Lorenzo Stoakes X-Mailer: Apple Mail (2.3774.100.2.1.4) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 5o2hsGZjg7EXtF2R7jEHpcKi99y3XOm6 X-Proofpoint-ORIG-GUID: SC_EZLQmn-G7AMdy4gRdi7ugTERNuBkh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-17_02,2023-10-17_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxscore=0 phishscore=0 clxscore=1015 priorityscore=1501 adultscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=786 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310170115 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: B303980004 X-Stat-Signature: iefaqw4b456zkp4xyhqmrzu4y8txo8qr X-HE-Tag: 1697549951-375020 X-HE-Meta: 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 q5lR5lDc 4Vg4nfsi/OKbz+vKy5EzZeaOCgI/8WLrKVCjiMhhAQqCKUFkbS/rNj+8mlK4VvcGGaBWzRY++j8+4s+FlTaeWjfT2K3xcmHV/ux3/GjbLUigvVslpfjCLMCPJpZ1sDJl9EGE74EKO6pXrWLwDHvr8WYuQmOdBV1bCn2NRtgiaHCYd0avrzQ1HnXzWsTvL3/U5oKt+WmgIJMorl5Kq2CYxvekRFBGMTVYutXUg3Hh2iEXvMsTuZrXdH6YUMfy6sYGnYjQAPobpytdzvTU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On 17-Oct-2023, at 4:35=E2=80=AFPM, Lorenzo Stoakes = wrote: >=20 > On Tue, Oct 17, 2023 at 02:46:07PM +0530, Sachin Sant wrote: >> While running LTP tests (getpid02) on a Power10 server booted with >> 6.6.0-rc6-next-20231016 following crash was seen: >>=20 >> [ 76.386628] Kernel attempted to read user page (d8) - exploit = attempt? (uid: 0) >> [ 76.386649] BUG: Kernel NULL pointer dereference on read at = 0x000000d8 >> [ 76.386653] Faulting instruction address: 0xc0000000004cda90 >> [ 76.386658] Oops: Kernel access of bad area, sig: 11 [#1] > [snip] >>=20 >> Git bisect points to following patch >>=20 >> commit 1db41d29b79ad271674081c752961edd064bbbac >> mm: perform the mapping_map_writable() check after call_mmap() >>=20 >> Reverting the patch allows the test to complete. >>=20 >> - Sachin >=20 > Hi Sachin, >=20 > Thanks for the report but this was triggered in another test = previously and > has been fixed already (apologies for the inconvenience!) see [0]. = Andrew > took the -fix patch and applied to mm-unstable, this should wend its = way to > -next in the meantime. Ah, thank you. Yes the fix works for me. - Sachin