/etc/kdump/pre.d/* Not getting Executed

[Coiby Xu]

Hi,

Have you resolved this issue? If not, feel free to open a bug on
https://bugzilla.redhat.com since /etc/kdump/pre.d/ is a feature
provided by Fedora/RHEL's kexec-tools.


On Wed, May 11, 2022 at 01:42:40PM +0530, arshad hussain wrote:
>Hello,
>
>I am trying to run a custom script before the dump (ie
>/etc/kdump/pre.d/* ) which I am unable to do.
>I can say this, as the script is supposed to create a folder under
>/var/crash and a file which it is not. It also does not generate the
>vmcore file.
>
>I am failing to understand what obvious step I am missing. Can someone
>please help out.
>
>While the "echo c > /proc/sysrq-trigger" successfully reboots the
>output is not what is expected.
>
>Here is my setup for kdump/kexec.
>
>Thanks!
>
>-------Expected output-------
>01. Under /var/crash we should be having a folder as "DBGMSG-<date>".
>02. Under /var/crash we should be having a file as "test512".
>03. vmcore file
>04. dmesg file
>
>-------current output-------
>Nothing under /var/crash
>
>-------Below are the info and conf script details-------
># uname -a (Kernel version)
>Linux rocky8 4.18.0-240.1.1.el8.x86_64 #1 SMP Fri Feb 19 20:41:01 UTC
>2021 x86_64 x86_64 x86_64 GNU/Linux
>
># rpm -qa | grep -i kexec (kexec-tool version)
>kexec-tools-2.0.20-46.el8.x86_64
>
># cat /proc/cmdline
>BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-4.18.0-240.1.1.el8.x86_64
>root=UUID=<UUID...> ro crashkernel=128M resume=UUID=<UUID...>
>
>
>------/etc/kdump.conf-------
>path /var/crash
>core_collector makedumpfile -l --message-level 7 -d 31
>extra_bins /var/crash/kdumppre.sh /bin/bash /usr/bin/cat /usr/bin/date
>kdump_pre /var/crash/kdumppre.sh
>force_rebuild 1
>
># tree /etc/kdump/
>/etc/kdump/
>├── post.d
>└── pre.d
>    └── 50-collect.sh
>
>-------/etc/kdump/pre.d/50-collect.sh-------
>#!/bin/bash
>
># base location
>LOC=/sysroot/var/crash
># dbgmsg identifier string
>DBGMSG="DBGMSG"
># log file
>LFILE=log.out
># Granularity in seconds
>LOCFOLDER=${LOC}/$DBGMSG-$(date +%Y-%m-%d:%H:%M:%S)
>
># Create folder.
>mkdir -p $LOCFOLDER
>
>if [ -f "/proc/spl/kstat/zfs/dbgmsg" ]; then
>    echo "/proc/spl/kstat/zfs/dbgmsg found" >> $LOCFOLDER/$LFILE
>    cat /proc/spl/kstat/zfs/dbgmsg >> $LOCFOLDER/$LFILE
>else
>    echo "/proc/spl/kstat/zfs/dbgmsg not found" >> $LOCFOLDER/$LFILE
>fi
>
>exit 0
>
>-------/var/crash/kdumppre.sh-------
>#!/bin/bash
>echo "Test512.......$(date)" >> /sysroot/var/carsh/test512
>exit 0
>
>
>(Lines starting with [Debug] is the debug statement put for debugging
>to verify if we are picking up correct key=value pairs)
># kdumpctl restart
>kdump: DEFAULT_DUMP_MODE=kdump
>kdump: kexec: unloaded kdump kernel
>kdump: Stopping kdump: [OK]
>[DEBUG]found config... path : /var/crash
>[DEBUG]found config... core_collector : makedumpfile -l --message-level 7 -d 31
>[DEBUG]found config... extra_bins : /var/crash/kdumppre.sh /bin/bash
>/usr/bin/cat /usr/bin/date
>[DEBUG]found config... kdump_pre : /var/crash/kdumppre.sh
>[DEBUG]found config... force_rebuild : 1
>kdump: restore default initrd:
>/boot/initramfs-4.18.0-240.1.1.el8_lustre.x86_64.img
>[DEBUG]files=/etc/kdump.conf
>/boot/vmlinuz-4.18.0-240.1.1.el8_lustre.x86_64  /var/crash/kdumppre.sh
>/var/crash/kdumppre.sh /bin/bash /usr/bin/cat /usr/bin/date
>/usr/sbin/makedumpfile
>[DEBUG]hook files=/etc/kdump.conf
>/boot/vmlinuz-4.18.0-240.1.1.el8_lustre.x86_64  /var/crash/kdumppre.sh
>/var/crash/kdumppre.sh /bin/bash /usr/bin/cat /usr/bin/date
>/usr/sbin/makedumpfile /etc/fstab /etc/kdump/post.d/ /etc/kdump/pre.d/
>  /etc/kdump/pre.d/50-collect.sh :: /etc/kdump/post.d/
>/etc/kdump/pre.d/   /etc/kdump/pre.d/50-collect.sh
>kdump: Detected change(s) in the following file(s):  /etc/kdump/pre.d/
>kdump: Force rebuild /boot/initramfs-4.18.0-240.1.1.el8_lustre.x86_64kdump.img
>kdump: Rebuilding /boot/initramfs-4.18.0-240.1.1.el8_lustre.x86_64kdump.img
>kdump: rebuild kdump initrd: /sbin/mkdumprd -f
>/boot/initramfs-4.18.0-240.1.1.el8_lustre.x86_64kdump.img
>4.18.0-240.1.1.el8_lustre.x86_64
>kdump: /sbin/kexec -s -d -p
>--command-line=BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-4.18.0-240.1.1.el8_lustre.x86_64
>ro resume=UUID=d5fad714-147f-419c-a8ea-9e7984b0ef2f irqpoll nr_cpus=1
>reset_devices cgroup_disable=memory mce=off numa=off
>udev.children-max=2 panic=10 rootflags=nofail acpi_no_memhotplug
>transparent_hugepage=never nokaslr novmcoredd hest_disable
>disable_cpu_apicid=0
>--initrd=/boot/initramfs-4.18.0-240.1.1.el8_lustre.x86_64kdump.img
>/boot/vmlinuz-4.18.0-240.1.1.el8_lustre.x86_64
>kdump: kexec: loaded kdump kernel
>kdump: Starting kdump: [OK]
>
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-- 
Best regards,
Coiby