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Wed, 2 Aug 2023 10:27:50 +0000 (GMT) Message-ID: <1f26411c-34b9-14e8-66eb-4854d5b1fbbb@linux.ibm.com> Date: Wed, 2 Aug 2023 15:57:49 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [next-20230731] Kdump fails to capture vmcore (powerpc) To: Sachin Sant , linuxppc-dev , linux-mm@kvack.org Cc: "Aneesh Kumar K.V" , Mahesh J Salgaonkar , Sourabh Jain , open list References: Content-Language: en-US From: Hari Bathini In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: R3CV6zB-xe7IR6XXK__oDj9g4eFKtygh X-Proofpoint-GUID: R3CV6zB-xe7IR6XXK__oDj9g4eFKtygh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-08-02_05,2023-08-01_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=999 clxscore=1011 impostorscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 mlxscore=0 spamscore=0 phishscore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308020089 X-Rspamd-Queue-Id: A6C1520012 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: kghb8pfycd4barbroq6ett9w4szze6xi X-HE-Tag: 1690972078-313392 X-HE-Meta: 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 I2dUx2Er TDB5O0xOLjj8syL5HI/a0250gTGsGBrX0QOU69tA2pSeqHFFy1vRgT8XougYEHS7+lK+juZK+BH5XP0lgKEbJ9EO60z58NLUBqrYjvvJHqd6f6/FNAB83tj9O3BgfBKKOFMycZV6280lAmWd00O3U7GpbT9ex+TFzKMX9Gx8jXs4WoVpK84a3Hmid6FyxWi3LHd1ljC6PlxSNSXPjj5Mkyjho0FUMKOvWzrxa 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 31/07/23 7:39 pm, Sachin Sant wrote: > Kernel Crash dump(kdump) and firmware assisted dump on powerpc > fails to capture vmcore on recent linux-next builds. > > Starting Kdump Vmcore Save Service... > systemd[1]: Starting Kdump Vmcore Save Service... > kdump[599]: Kdump is using the default log level(3). > kdump[635]: saving to /sysroot/var/crash/127.0.0.1-2023-07-31-09:01:28/ > kdump[639]: Remounting the dump target in rw mode. > kdump[643]: saving vmcore-dmesg.txt to /sysroot/var/crash/127.0.0.1-2023-07-31-09:01:28/ > kdump[649]: saving vmcore-dmesg.txt complete > kdump[651]: saving vmcore > kdump.sh[652]: readpage_elf: Attempt to read non-existent page at 0x4000000000000000. > kdump.sh[652]: readmem: type_addr: 0, addr:0, size:8 > kdump.sh[652]: get_vmemmap_list_info: Can't get vmemmap region addresses > kdump.sh[652]: get_machdep_info_ppc64: Can't get vmemmap list info. > kdump.sh[652]: makedumpfile Failed. > kdump[654]: saving vmcore failed, exitcode:1 > kdump[656]: saving the /run/initramfs/kexec-dmesg.log to /sysroot/var/crash/127.0.0.1-2023-07-31-09:01:28// > kdump[663]: saving vmcore failed > systemd[1]: kdump-capture.service: Main process exited, code=exited, status=1/FAILURE > systemd[1]: kdump-capture.service: Failed with result 'exit-code'. > systemd[1]: Failed to start Kdump Vmcore Save Service. > [FAILED] Failed to start Kdump Vmcore Save Service. > > Git bisect points to following patch: > > 8dc9a0ad0c3e7f43e4e091e4e24634e21ce17a54 is the first bad commit > commit 8dc9a0ad0c3e7f43e4e091e4e24634e21ce17a54 > powerpc/book3s64/vmemmap: switch radix to use a different vmemmap handling function > Earlier, makedumpfile made use of vmemmap_list to populate all the vmemmap regions but that changed for radix. It uses the init_mm pgtable for vmemmap regions. A fix is needed in makedumpfile to catch up with the above change. Thanks Hari