VMCORE and kdump.conf file not found LINUX 6.12 KERNEL

VMCORE and kdump.conf file not found LINUX 6.12 KERNEL

[Gokul Praveen]

Hi Team,

It would be really great,if you could help me with a couple of questions 
regarding kexec and kdump.

I tried kdump on my SOC and it is rebooting fine . However,the VMCORE 
file and /etc/kdump.conf file is not found.

VERSION:
kexec-tools 2.0.30.
kernel 6.12v

STEPS FOLLOWED:

1)git clone git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git

2)
    HOST PC:
	>cd $KEXEC_TOOLS_DIR
	>./bootstrap LDFLAGS=-static ./configure --prefix=/usr/local 
--host=aarch64-linux-gnu --target=aarch64-linux-gnu
	>make
	>cp $KEXEC_TOOLS_DIR/build/sbin/kexec /media/$USER/rootfs/usr/sbin (To 
copy the kexec binary to the rootfs filesystem of the target board)

    TARGET BOARD:
	>Booted upto linux
	>cmdline="crashkernel=128M console=ttyS2,115200n8 root=/dev/mmcblk0p2 
rw rootfste=ext4 rootwait" (/dev/mmcblk0p2 refers to EMMC)
	> /kexec -p /Image --command-line="$cmdline" 
--dtb=/k3-j721e-common-proc-board.dtb
	> echo c > /proc/sysrq-trigger


LOGS:

          Starting Reboot and dump vmcore via kexec...
[  OK  ] Listening on Docker Socket for the API.
[  OK  ] Listening on Weston socket.
[  OK  ] Started D-Bus System Message Bus.
[  OK  ] Reached target Socket Units.
[  OK  ] Reached target Basic System.
[  OK  ] Started Job spooling tools.
          Starting Avahi mDNS/DNS-SD Stack...
[  OK  ] Started Periodic Command Scheduler.
          Starting Print notice about GPLv3 packages...
          Starting IPv6 Packet Filtering Framework...
          Starting IPv4 Packet Filtering Framework...
[  OK  ] Started irqbalance daemon.
          Starting Telephony service...
          Starting Expand the rootfs partiti…to full size of the boot 
device....
[    5.992254] audit: type=1334 audit(1728487094.820:10): prog-id=14 op=LOAD

[    6.003634] audit: type=1334 audit(1728487094.832:11): prog-id=15 op=LOAD
[    6.010482] audit: type=1334 audit(1728487094.832:12): prog-id=16 op=LOAD
          Starting User Login Management...
          Starting Telnet Server...
[  OK  ] Finished IPv6 Packet Filtering Framework.
[  OK  ] Finished IPv4 Packet Filtering Framework.
[  OK  ] Finished Telnet Server.
[  OK  ] Started User Login Management.
[  OK  ] Finished Expand the rootfs partition to full size of the boot 
device..
[  OK  ] Started Telephony service.
[  OK  ] Started Avahi mDNS/DNS-SD Stack.
[  OK  ] Created slice Slice /system/systemd-fsck.
          Expecting device /dev/mmcblk0p1...
[  OK  ] Reached target Preparation for Network.
          Starting Load Kernel Module drm...
[    6.406000] audit: type=1334 audit(1728487095.236:13): prog-id=17 op=LOAD
          Starting Network Configuration...
          Starting Virtual Console Setup...
[  OK  ] Stopped target RPC Port Mapper.
[  OK  ] Stopped target Timer Units.
[  OK  ] Stopped Daily rotation of log files.
[  OK  ] Stopped Daily Cleanup of Temporary Directories.
[  OK  ] Stopped target System Time Set.
          Stopping Job spooling tools...
          Stopping Avahi mDNS/DNS-SD Stack...
          Stopping Periodic Command Scheduler...
          Stopping irqbalance daemon...
[  OK  ] Stopped target Host and Network Name Lookups.
          Stopping Telephony service...
[  OK  ] Stopped Expand the rootfs partition to full size of the boot 
device..
          Stopping strongSwan IPsec IKEv1/IKEv2 daemon using ipsec.conf...
[  OK  ] Removed slice Slice /system/getty.
[  OK  ] Removed slice Slice /system/serial-getty.
          Stopping User Login Management...
          Stopping Load/Save OS Random Seed...
          Starting Record Runlevel Change in UTMP...
          Stopping Telnet Server...
[  OK  ] Stopped target Remote File Systems.
[  OK  ] Stopped Reboot and dump vmcore via kexec.

Re: VMCORE and kdump.conf file not found LINUX 6.12 KERNEL

[Gokul Praveen]

Hi Team,

Just a reminder.
It would be really great if you could help me with the following.

Regards
Gokul

On 05/02/25 17:50, Gokul Praveen wrote:
> Hi Team,
> 
> It would be really great,if you could help me with a couple of questions 
> regarding kexec and kdump.
> 
> I tried kdump on my SOC and it is rebooting fine . However,the VMCORE 
> file and /etc/kdump.conf file is not found.
> 
> VERSION:
> kexec-tools 2.0.30.
> kernel 6.12v
> 
> STEPS FOLLOWED:
> 
> 1)git clone git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
> 
> 2)
>     HOST PC:
>      >cd $KEXEC_TOOLS_DIR
>      >./bootstrap LDFLAGS=-static ./configure --prefix=/usr/local 
> --host=aarch64-linux-gnu --target=aarch64-linux-gnu
>      >make
>      >cp $KEXEC_TOOLS_DIR/build/sbin/kexec /media/$USER/rootfs/usr/sbin 
> (To copy the kexec binary to the rootfs filesystem of the target board)
> 
>     TARGET BOARD:
>      >Booted upto linux
>      >cmdline="crashkernel=128M console=ttyS2,115200n8 
> root=/dev/mmcblk0p2 rw rootfste=ext4 rootwait" (/dev/mmcblk0p2 refers to 
> EMMC)
>      > /kexec -p /Image --command-line="$cmdline" 
> --dtb=/k3-j721e-common-proc-board.dtb
>      > echo c > /proc/sysrq-trigger
> 
> 
> LOGS:
> 
>           Starting Reboot and dump vmcore via kexec...
> [  OK  ] Listening on Docker Socket for the API.
> [  OK  ] Listening on Weston socket.
> [  OK  ] Started D-Bus System Message Bus.
> [  OK  ] Reached target Socket Units.
> [  OK  ] Reached target Basic System.
> [  OK  ] Started Job spooling tools.
>           Starting Avahi mDNS/DNS-SD Stack...
> [  OK  ] Started Periodic Command Scheduler.
>           Starting Print notice about GPLv3 packages...
>           Starting IPv6 Packet Filtering Framework...
>           Starting IPv4 Packet Filtering Framework...
> [  OK  ] Started irqbalance daemon.
>           Starting Telephony service...
>           Starting Expand the rootfs partiti…to full size of the boot 
> device....
> [    5.992254] audit: type=1334 audit(1728487094.820:10): prog-id=14 
> op=LOAD
> 
> [    6.003634] audit: type=1334 audit(1728487094.832:11): prog-id=15 
> op=LOAD
> [    6.010482] audit: type=1334 audit(1728487094.832:12): prog-id=16 
> op=LOAD
>           Starting User Login Management...
>           Starting Telnet Server...
> [  OK  ] Finished IPv6 Packet Filtering Framework.
> [  OK  ] Finished IPv4 Packet Filtering Framework.
> [  OK  ] Finished Telnet Server.
> [  OK  ] Started User Login Management.
> [  OK  ] Finished Expand the rootfs partition to full size of the boot 
> device..
> [  OK  ] Started Telephony service.
> [  OK  ] Started Avahi mDNS/DNS-SD Stack.
> [  OK  ] Created slice Slice /system/systemd-fsck.
>           Expecting device /dev/mmcblk0p1...
> [  OK  ] Reached target Preparation for Network.
>           Starting Load Kernel Module drm...
> [    6.406000] audit: type=1334 audit(1728487095.236:13): prog-id=17 
> op=LOAD
>           Starting Network Configuration...
>           Starting Virtual Console Setup...
> [  OK  ] Stopped target RPC Port Mapper.
> [  OK  ] Stopped target Timer Units.
> [  OK  ] Stopped Daily rotation of log files.
> [  OK  ] Stopped Daily Cleanup of Temporary Directories.
> [  OK  ] Stopped target System Time Set.
>           Stopping Job spooling tools...
>           Stopping Avahi mDNS/DNS-SD Stack...
>           Stopping Periodic Command Scheduler...
>           Stopping irqbalance daemon...
> [  OK  ] Stopped target Host and Network Name Lookups.
>           Stopping Telephony service...
> [  OK  ] Stopped Expand the rootfs partition to full size of the boot 
> device..
>           Stopping strongSwan IPsec IKEv1/IKEv2 daemon using ipsec.conf...
> [  OK  ] Removed slice Slice /system/getty.
> [  OK  ] Removed slice Slice /system/serial-getty.
>           Stopping User Login Management...
>           Stopping Load/Save OS Random Seed...
>           Starting Record Runlevel Change in UTMP...
>           Stopping Telnet Server...
> [  OK  ] Stopped target Remote File Systems.
> [  OK  ] Stopped Reboot and dump vmcore via kexec.

Re: VMCORE and kdump.conf file not found LINUX 6.12 KERNEL

[Dave Young]

On Tue, 18 Feb 2025 at 14:07, Gokul Praveen <g-praveen@ti.com> wrote:
>
> Hi Team,
>
> Just a reminder.
> It would be really great if you could help me with the following.
>
> Regards
> Gokul
>
> On 05/02/25 17:50, Gokul Praveen wrote:
> > Hi Team,
> >
> > It would be really great,if you could help me with a couple of questions
> > regarding kexec and kdump.
> >
> > I tried kdump on my SOC and it is rebooting fine . However,the VMCORE
> > file and /etc/kdump.conf file is not found.
> >
> > VERSION:
> > kexec-tools 2.0.30.
> > kernel 6.12v
> >
> > STEPS FOLLOWED:
> >
> > 1)git clone git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
> >
> > 2)
> >     HOST PC:
> >      >cd $KEXEC_TOOLS_DIR
> >      >./bootstrap LDFLAGS=-static ./configure --prefix=/usr/local
> > --host=aarch64-linux-gnu --target=aarch64-linux-gnu
> >      >make
> >      >cp $KEXEC_TOOLS_DIR/build/sbin/kexec /media/$USER/rootfs/usr/sbin
> > (To copy the kexec binary to the rootfs filesystem of the target board)
> >
> >     TARGET BOARD:
> >      >Booted upto linux
> >      >cmdline="crashkernel=128M console=ttyS2,115200n8
> > root=/dev/mmcblk0p2 rw rootfste=ext4 rootwait" (/dev/mmcblk0p2 refers to
> > EMMC)
> >      > /kexec -p /Image --command-line="$cmdline"
> > --dtb=/k3-j721e-common-proc-board.dtb
> >      > echo c > /proc/sysrq-trigger

Hi,

This looks more like a distribution related issue, I suggest you ask
distribution developers to help.

Thanks
Dave

Re: VMCORE and kdump.conf file not found LINUX 6.12 KERNEL

[Philipp Rudo]

Hi,

On Tue, 18 Feb 2025 16:48:26 +0800
Dave Young <dyoung@redhat.com> wrote:

> On Tue, 18 Feb 2025 at 14:07, Gokul Praveen <g-praveen@ti.com> wrote:
> >
> > Hi Team,
> >
> > Just a reminder.
> > It would be really great if you could help me with the following.
> >
> > Regards
> > Gokul
> >
> > On 05/02/25 17:50, Gokul Praveen wrote:  
> > > Hi Team,
> > >
> > > It would be really great,if you could help me with a couple of questions
> > > regarding kexec and kdump.
> > >
> > > I tried kdump on my SOC and it is rebooting fine . However,the VMCORE
> > > file and /etc/kdump.conf file is not found.
> > >
> > > VERSION:
> > > kexec-tools 2.0.30.
> > > kernel 6.12v
> > >
> > > STEPS FOLLOWED:
> > >
> > > 1)git clone git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
> > >
> > > 2)
> > >     HOST PC:  
> > >      >cd $KEXEC_TOOLS_DIR
> > >      >./bootstrap LDFLAGS=-static ./configure --prefix=/usr/local  
> > > --host=aarch64-linux-gnu --target=aarch64-linux-gnu  
> > >      >make
> > >      >cp $KEXEC_TOOLS_DIR/build/sbin/kexec /media/$USER/rootfs/usr/sbin  
> > > (To copy the kexec binary to the rootfs filesystem of the target board)
> > >
> > >     TARGET BOARD:  
> > >      >Booted upto linux
> > >      >cmdline="crashkernel=128M console=ttyS2,115200n8  
> > > root=/dev/mmcblk0p2 rw rootfste=ext4 rootwait" (/dev/mmcblk0p2 refers to
> > > EMMC)  
> > >      > /kexec -p /Image --command-line="$cmdline"  
> > > --dtb=/k3-j721e-common-proc-board.dtb

The kdump kernel only presents the dump via /proc/vmcore but doesn't
write it to disk. That is done by user space contained in the initrd.
So for it to work you also have to provide an initrd that mounts the
target disk and writes the dump to it. But, as Dave already pointed
out, the creation of initrds is highly distro specific.

Thanks
Philipp

> > >      > echo c > /proc/sysrq-trigger  
> 
> Hi,
> 
> This looks more like a distribution related issue, I suggest you ask
> distribution developers to help.
> 
> Thanks
> Dave
> 
>