I am trying to analyse the dump created by the kdump utility. This is what I did
I took 2.6.25.14 vanilla version of kernel and made two copies of the kernel named vmlinuz-2.6.25.14-main (Production kernel) and vmlinuz-2.6.25.14-kdump (Crash kernel) by following the procedure mentioned in the following website
http://www.dedoimedo.com/computers/kdump.html
When I run crash utility using the following command
crash /usr/src/linux-2.6.25.14-main/vmlinux /var/crash/2009-08-08-23:32/vmcore
I get the following error
crash /usr/src/linux-2.6.25.14-main/vmlinux /var/crash/2009-08-08-23:32/vmcore
crash 4.0-6.0.5
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crash: read error: kernel virtual address: c1399f10 type: "xtime"
I checked for the error and found this link which mentions few work-around/fixes for the issue with reading of /dev/mem
http://www.mail-archive.com/crash-utility@xxxxxxxxxx/msg01553.html
I tried adding CONFIG_STRICT_DEVMEM to the .config file (This parameter was not already present in the config file)
I got the following error while compiling the kernel
scripts/kconfig/mconf arch/x86/Kconfig
.config:3869:warning: trying to assign nonexistent symbol STRICT_DEVMEM
I tried to create the kretprobe module, it works fine for do_fork() but when I give devmem_is_allowed() as the functioin name I get the following error
[root@buzzsaw kprobes]# insmod kretprobe_devmem.ko
insmod: error inserting 'kretprobe_devmem.ko': -1 Operation not permitted
I am new to the area of kernel debugging. Please let me know how I can solve this issue. Thanks
--
Regards,
Mani
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