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

[arshad hussain]

Hi Coiby Xu,

I have not yet resolved this so far. I could get it working once and
thereafter I could not reproduce it. So I do not have a deterministic
step to reproduce this. Still WIP from my end. I have already posted
the question to kxec folkes:
http://lists.infradead.org/pipermail/kexec/2022-May/024919.html. Will
also post the bug to redhat.

Thanks
Arshad

On Tue, Jun 7, 2022 at 8:05 AM Coiby Xu <coxu at redhat.com> wrote:
>
> 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]
> >
> >_______________________________________________
> >kexec mailing list
> >kexec at lists.infradead.org
> >http://lists.infradead.org/mailman/listinfo/kexec
>
> --
> Best regards,
> Coiby
>