Hi,
We are trying to debug the kernel crash using kdump. But cant able to generate even crashdump for kernel crash.
We have configure below configuration in kernel and download kdump-tools, kexec related files from debian and installed on custom board.
CONFIG_KEXEC=y
CONFIG_CRASH_DUMP=y
CONFIG_DEBUG_INFO=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_PROC_VMCORE=y
We disabled watchdog also from reboot when trigger happened.
While passing kexec command we are getting kexec_file_load not avialable. Any configuration is missing?root@sd:/boot# kexec -d -l /boot/zImage --dtb=/boot/am574x-idk.dtb --command-line="console=ttyO2,115200n8 root=PARTUUID=dbf29694-02 rw rootfstype=ext4 rootwait crashkernel=64M"
syscall kexec_file_load not available.
kernel: 0xb6b3b008 kernel_size: 0x336200
MEMORY RANGES
0000000080000000-000000009fffffff (0)
00000000ac000000-00000000fecfffff (0)
zImage header: 0x016f2818 0x00000000 0x00336200
zImage size 0x336200, file size 0x336200
zImage requires 0x00347200 bytes
Kernel: address=0x80008000 size=0x01063a00
DT : address=0x8106d000 size=0x000184ed
kexec_load: entry = 0x80008000 flags = 0x280000
nr_segments = 2
segment[0].buf = 0xb6b3b008
segment[0].bufsz = 0x336204
segment[0].mem = 0x80008000
segment[0].memsz = 0x337000
segment[1].buf = 0x452008
segment[1].bufsz = 0x184ed
segment[1].mem = 0x8106d000
segment[1].memsz = 0x19000
and starting service also im getting this below log
root@AMxxxx~# systemctl start kdump-tools.service
[ 51.164896] kdump-tools[1158]: Starting kdump-tools: Creating symlink /var/lib/kdump/vmlinuz.
[ 51.178211] kdump-tools[1158]: Creating symlink /var/lib/kdump/initrd.img.
[ 51.185858] kdump-tools[1158]: /usr/sbin/kdump-config: line 201: file: command not found
[ 51.198261] kdump-tools[1158]: Invalid symlink : /var/lib/kdump/initrd.img ... failed!
[ 51.199251] kdump-tools[1158]: Creating symlink /var/lib/kdump/initrd.img.
[ 51.205708] kdump-tools[1158]: /usr/sbin/kdump-config: line 201: file: command not found
[ 51.217959] kdump-tools[1158]: Invalid symlink : /var/lib/kdump/vmlinuz ... failed!
[ 51.218940] kdump-tools[1158]: Creating symlink /var/lib/kdump/vmlinuz.
[ 51.251533] kdump-tools[1158]: /usr/sbin/kdump-config: line 516: file: command not found
[ 51.272736] kdump-tools[1158]: syscall kexec_file_load not available.
[ 51.273740] kdump-tools[1158]: No kernel specified
[ 51.274634] kdump-tools[1158]: kexec-tools 2.0.18
[ 51.275280] kdump-tools[1158]: Usage: kexec [OPTION]... [kernel]
[ 51.275926] kdump-tools[1158]: Directly reboot into a new kernel
[ 51.276565] kdump-tools[1158]: -h, --help Print this help.
[ 51.277192] kdump-tools[1158]: -v, --version Print the version of kexec.
[ 51.277852] kdump-tools[1158]: -f, --force Force an immediate kexec,
[ 51.278491] kdump-tools[1158]: don't call shutdown.
[ 51.279132] kdump-tools[1158]: -i, --no-checks Fast reboot, no memory integrity checks.
[ 51.279759] kdump-tools[1158]: -x, --no-ifdown Don't bring down network interfaces.
[ 51.281359] kdump-tools[1158]: -y, --no-sync Don't sync filesystems before kexec.
[ 51.282052] kdump-tools[1158]: -l, --load Load the new kernel into the
[ 51.282734] kdump-tools[1158]: current kernel.
[ 51.283417] kdump-tools[1158]: -p, --load-panic Load the new kernel for use on panic.
[ 51.284196] kdump-tools[1158]: -u, --unload Unload the current kexec target kernel.
[ 51.284893] kdump-tools[1158]: If capture kernel is being unloaded
[ 51.285666] kdump-tools[1158]: specify -p with -u.
[ 51.286367] kdump-tools[1158]: -e, --exec Execute a currently loaded kernel.
[ 51.287032] kdump-tools[1158]: -t, --type=TYPE Specify the new kernel is of this type.
[ 51.290331] kdump-tools[1158]: --mem-min=<addr> Specify the lowest memory address to
[ 51.291094] kdump-tools[1158]: load code into.
[ 51.291714] kdump-tools[1158]: --mem-max=<addr> Specify the highest memory address to
[ 51.292347] kdump-tools[1158]: load code into.
[ 51.292963] kdump-tools[1158]: --reuseinitrd Reuse initrd from first boot.
[ 51.293515] kdump-tools[1158]: --print-ckr-size Print crash kernel region size.
[ 51.294168] kdump-tools[1158]: --load-preserve-context Load the new kernel and preserve
[ 51.294824] kdump-tools[1158]: context of current kernel during kexec.
[ 51.295398] kdump-tools[1158]: --load-jump-back-helper Load a helper image to jump back
[ 51.295964] kdump-tools[1158]: to original kernel.
[ 51.296573] kdump-tools[1158]: --entry=<addr> Specify jump back address.
[ 51.297355] kdump-tools[1158]: (0 means it's not jump back or
[ 51.298029] kdump-tools[1158]: preserve context)
[ 51.298429] kdump-tools[1158]: to original kernel.
[ 51.298947] kdump-tools[1158]: -s, --kexec-file-syscall Use file based syscall for kexec operation
[ 51.299465] kdump-tools[1158]: -c, --kexec-syscall Use the kexec_load syscall for for compatibility
[ 51.299859] kdump-tools[1158]: with systems that don't support -s (default)
[ 51.300331] kdump-tools[1158]: -a, --kexec-syscall-auto Use file based syscall for kexec and fall
[ 51.300717] kdump-tools[1158]: back to the compatibility syscall when file based
[ 51.301113] kdump-tools[1158]: syscall is not supported or the kernel did not
[ 51.302620] kdump-tools[1158]: understand the image
[ 51.303016] kdump-tools[1158]: -d, --debug Enable debugging to help spot a failure.
[ 51.303391] kdump-tools[1158]: -S, --status Return 0 if the type (by default crash) is loaded.
[ 51.303770] kdump-tools[1158]: Supported kernel file types and options:
[ 51.304154] kdump-tools[1158]: uImage
[ 51.304524] kdump-tools[1158]: --command-line=STRING Set the kernel command line to STRING.
[ 51.304897] kdump-tools[1158]: --append=STRING Set the kernel command line to STRING.
[ 51.305277] kdump-tools[1158]: --initrd=FILE Use FILE as the kernel's initial ramdisk.
[ 51.305650] kdump-tools[1158]: --ramdisk=FILE Use FILE as the kernel's initial ramdisk.
[ 51.306019] kdump-tools[1158]: --dtb=FILE Use FILE as the fdt blob.
[ 51.306385] kdump-tools[1158]: --atags Use ATAGs instead of device-tree.
[ 51.306756] kdump-tools[1158]: --page-offset=PAGE_OFFSET
[ 51.637830] kdump-tools[1158]: Set PAGE_OFFSET of crash dump vmcore
[ 51.638249] kdump-tools[1158]: zImage
[ 51.638624] kdump-tools[1158]: --command-line=STRING Set the kernel command line to STRING.
[ 51.638993] kdump-tools[1158]: --append=STRING Set the kernel command line to STRING.
[ 51.639361] kdump-tools[1158]: --initrd=FILE Use FILE as the kernel's initial ramdisk.
[ 51.639731] kdump-tools[1158]: --ramdisk=FILE Use FILE as the kernel's initial ramdisk.
[ 51.640216] kdump-tools[1158]: --dtb=FILE Use FILE as the fdt blob.
[ 51.640590] kdump-tools[1158]: --atags Use ATAGs instead of device-tree.
[ 51.640956] kdump-tools[1158]: --page-offset=PAGE_OFFSET
[ 51.641326] kdump-tools[1158]: Set PAGE_OFFSET of crash dump vmcore
[ 51.641691] kdump-tools[1158]: Architecture options:
[ 51.642060] kdump-tools[1158]: --image-size=<size>
[ 51.642429] kdump-tools[1158]: Specify the assumed total image size of
[ 51.642797] kdump-tools[1158]: the kernel that is about to be loaded,
[ 51.643188] kdump-tools[1158]: including the .bss section, as reported
[ 51.643561] kdump-tools[1158]: by 'arm-linux-size vmlinux'. If not
[ 51.643931] kdump-tools[1158]: specified, this value is implicitly set
[ 51.644301] kdump-tools[1158]: to the compressed images size * 4.
[ 51.644682] kdump-tools[1158]: --dt-no-old-root
[ 51.645054] kdump-tools[1158]: do not reuse old kernel root= param.
[ 51.645424] kdump-tools[1158]: while creating flatten device tree.
[ 51.645894] kdump-tools[1158]: failed to load kdump kernel ... failed!
Can you explain the steps to enable the kdump for while crash happened?
Thanks
Uthayakumar RH
