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[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.] ** Tags added: patch -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to makedumpfile in Ubuntu. https://bugs.launchpad.net/bugs/2038248 Title: Slab page exclusion issue on Linux 6.2-rc1 Status in makedumpfile package in Ubuntu: New Status in makedumpfile source package in Lunar: In Progress Bug description: [Impact] The Kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to allow larger rcu_head"), included in Linux 6.2-rc1 and later versions, introduced a change that aligns the offset of slab.slabs with that of page.mapping. However, this modification unintentionally causes the makedumpfile command with the -d 8 option, meant to exclude user data, to incorrectly exclude certain slab pages. Consequently, when utilizing dumpfiles generated in this manner, the "crash" utility may encounter an error when attempting to initiate a session: crash: page excluded: kernel virtual address: ffff0000e269d428 type: "xa_node shift" [Fix] An upstream fix is available. ========== commit 5f17bdd2128998a3eeeb4521d136a192222fadb6 Author: Kazuhito Hagio <k-hagio...@nec.com> Date: Wed Dec 21 11:06:39 2022 +0900 [PATCH] Fix wrong exclusion of slab pages on Linux 6.2-rc1 ========== [Test Plan] 1. Install the required packages and then proceed to reboot the machine. # sudo apt install crash linux-crashdump -y # reboot 2. To check the status of kdump, use the `kdump-config show` command. # kdump-config show DUMP_MODE: kdump USE_KDUMP: 1 KDUMP_COREDIR: /var/crash crashkernel addr: 0x64000000 /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-33-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-6.2.0-33-generic current state: ready to kdump kexec command: /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-6.2.0-33-generic root=UUID=3e72f5d5-870b-4b8e-9a0d-8ba920391379 ro console=tty1 console=ttyS0 reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll usbcore.nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz 3. To trigger a crash dump forcefully, execute the `echo c | sudo tee /proc/sysrq-trigger` command. 4. Download the kernel .ddeb file, which will be used for analyzing the dump file. # sudo -i # cd /var/crash # pull-lp-ddebs linux-image-unsigned-$(uname -r) # dpkg-deb -x linux-image-unsigned-$(uname -r)-*.ddeb dbgsym-$(uname -r) 5. Utilize the "crash" utility to parse and analyze the dump file. # crash dbgsym-$(uname -r)/usr/lib/debug/boot/vmlinux-$(uname -r) XXXX/dump.XXXX crash 8.0.3++ Copyright (C) 2002-2022 Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005, 2011, 2020-2022 NEC Corporation Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. Copyright (C) 2015, 2021 VMware, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. GNU gdb (GDB) 10.2 Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "aarch64-unknown-linux-gnu". Type "show configuration" for configuration details. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... please wait... (gathering task table data) crash: page excluded: kernel virtual address: ffff0000e269d428 type: "xa_node shift" [Where problems could occur] The patch has altered the method for excluding slab pages, aligning with the structural changes introduced in Linux 6.2-rc1. This modification is essential for Linux kernel 6.2. However, it's crucial to note that this change may impact the content of the dump file, potentially leading to a situation where the "crash" utility is unable to parse it in the worst-case scenario. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/2038248/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
