For item 1:
* Confirm that makedumpfile works as expected by triggering a kdump.
I can confirm that makedumpfile 1:1.6.7-1ubuntu2.5 from focal-
proposed/main worked well when I triggered a dump in a system:
ubuntu@fabio-small-makedumpfile:~$ sudo hostnamectl
Static hostname: fabio-small-makedumpfile
Icon name: computer-vm
Chassis: vm
Machine ID: dee0adfb9aa54246b4d1e2fc62dd50f7
Boot ID: adba6ba3977f4c758a7008013a7a6d1e
Virtualization: oracle
Operating System: Ubuntu 20.04.6 LTS
Kernel: Linux 5.15.0-1049-oracle
Architecture: x86-64
ubuntu@fabio-small-makedumpfile:~$ sudo kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr: 0x2c000000
0xfd7f000000
/boot/vmlinuz-5.15.0-1049-oracle
kdump initrd:
/boot/initrd.img-5.15.0-1049-oracle
current state: ready to kdump
kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-5.15.0-1049-oracle
root=UUID=7d8611b4-d3e7-4f1a-a8f9-e1a7e5a2d2f9 ro console=tty1 console=ttyS0
nvme.shutdown_timeout=10 libiscsi.debug_libiscsi_eh=1
crash_kexec_post_notifiers reset_devices systemd.unit=kdump-tools-dump.service
nr_cpus=1 irqpoll nousb" --initrd=/boot/initrd.img-5.15.0-1049-oracle
/boot/vmlinuz-5.15.0-1049-oracle
ubuntu@fabio-small-makedumpfile:~$ sudo dpkg -l makedumpfile
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-==================-============-=================================
ii makedumpfile 1:1.6.7-1ubuntu2.5 amd64 VMcore extraction tool
ubuntu@fabio-small-makedumpfile:~$ sudo apt-cache policy makedumpfile
makedumpfile:
Installed: 1:1.6.7-1ubuntu2.5
Candidate: 1:1.6.7-1ubuntu2.5
Version table:
*** 1:1.6.7-1ubuntu2.5 500
500 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
100 /var/lib/dpkg/status
1:1.6.7-1ubuntu2.4 500
500 http://phx-ad-3.clouds.archive.ubuntu.com/ubuntu focal-updates/main
amd64 Packages
1:1.6.7-1ubuntu2 500
500 http://phx-ad-3.clouds.archive.ubuntu.com/ubuntu focal/main amd64
Packages
Output showing that it completed well:
[ 54.490112] kdump-tools[676]: Starting kdump-tools:
[ 54.876357] kdump-tools[686]: * running makedumpfile -c -d 31 /proc/vmcore
/var/crash/202312151524/dump-incomplete
Checking for memory holes : [100.0 %] \ [
204.391465] reboot: Restarting system
And when I look at the crash, it's properly compressed (system had 1TB of RAM):
ubuntu@fabio-small-makedumpfile:~$ ls -lh /var/crash/202312151524
total 2.3G
-rw------- 1 root root 126K Dec 15 15:26 dmesg.202312151524
-rw------- 1 root root 2.3G Dec 15 15:26 dump.202312151524
Regards,
Fabio Martins
--
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/1970672
Title:
makedumpfile falls back to cp with "__vtop4_x86_64: Can't get a valid
pmd_pte."
Status in makedumpfile package in Ubuntu:
Fix Released
Status in makedumpfile source package in Focal:
Fix Committed
Bug description:
[Impact]
* On Focal with an HWE (>=5.12) kernel, makedumpfile can sometimes fail with
"__vtop4_x86_64: Can't get a valid pmd_pte."
* makedumpfile falls back to cp for the dump, resulting in extremely
large vmcores. This can impact both collection and analysis due to
lack of space for the resulting vmcore.
* This is fixed in upstream commit present in versions 1.7.0 and 1.7.1:
https://github.com/makedumpfile/makedumpfile/commit/646456862df8926ba10dd7330abf3bf0f887e1b6
commit 646456862df8926ba10dd7330abf3bf0f887e1b6
Author: Kazuhito Hagio <[email protected]>
Date: Wed May 26 14:31:26 2021 +0900
[PATCH] Increase SECTION_MAP_LAST_BIT to 5
* Required for kernel 5.12
Kernel commit 1f90a3477df3 ("mm: teach pfn_to_online_page() about
ZONE_DEVICE section collisions") added a section flag
(SECTION_TAINT_ZONE_DEVICE) and causes makedumpfile an error on
some machines like this:
__vtop4_x86_64: Can't get a valid pmd_pte.
readmem: Can't convert a virtual address(ffffe2bdc2000000) to physical
address.
readmem: type_addr: 0, addr:ffffe2bdc2000000, size:32768
__exclude_unnecessary_pages: Can't read the buffer of struct page.
create_2nd_bitmap: Can't exclude unnecessary pages.
Increase SECTION_MAP_LAST_BIT to 5 to fix this. The bit had not
been used until the change, so we can just increase the value.
Signed-off-by: Kazuhito Hagio <[email protected]>
[Test Plan]
* Confirm that makedumpfile works as expected by triggering a kdump.
* Confirm that the patched makedumpfile works as expected on a system
known to experience the issue.
* Confirm that the patched makedumpfile is able to work with a cp-
generated known affected vmcore to compress it. The unpatched version
fails.
[Where problems could occur]
* This change could adversely affect the collection/compression of
vmcores during a kdump situation resulting in fallback to cp.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1970672/+subscriptions
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