Problems writing ELF dumps with makedumpfile 1.2.9

[Ken'ichi Ohmichi]

Hi Kevin,

Thank you for reporting.

I guess that the problem depends on kernel configuration, and I want
to reproduce it on my machine for investigating. Could you send me
your kernel .config file ? And please let me know the kernel version.


Thanks
Ken'ichi Ohmichi

Worth, Kevin wrote:
> Hello,
> 
> I have a couple errors that also happened on 1.2.6 and I wondered if anyone might have a suggestion why.
> 
> The one thing I know might be strange about my system is that my first kernel (the one that panics) is compiled with CONFIG_VMSPLIT_1G, meaning that it is set to have 3GB of kernel space and 1GB of user space. I believe this does things to CONFIG_PAGE_OFFSET, but the depth of my kernel knowledge is not so great.
> 
> 
> # makedumpfile -E -d 31 -i /boot/vmcoreinfo vmcore dumpoutput2
> check_release: /boot/vmcoreinfo and vmcore don't match.
> 
> makedumpfile Failed.
> 
> The release numbers of the vmcore and vmcoreinfo files should be identical. This happens if I specify anything greater than "-d 1".
> 
> I tried a quick addition to the printf to include the values that generate the above error. It looks like "system_utsname.release" is NULL coming into the strcmp on line 340 of makedumpfile.c . Unfortunately I don't know enough about the kernel to go further than this.
> 
> 
> Additionally (potentially a separate issue), on an identical piece of hardware, but with 4GB of memory instead of 2GB, using "-d 1", I get the following error:
> 
> Excluding zero pages               : [ 38 %] readmem: Can't seek the dump memory(/proc/vmcore). Invalid argument
> create_2nd_bitmap: Can't exclude pages filled with zerocreate_2nd_bitmap: for creating an ELF dumpfile.
> 
> makedumpfile Failed.
> 
> I can cp the file just fine and it loads up in crash, but I can't seem to use makedumpfile to trim the vmcore down at all on this system with more memory.
> 
> Any suggestions? Thanks!
> 
> 
> Kevin Worth
> Network Security
> Software Engineer
> kevin.worth at hp.com<mailto:kevin.worth at hp.com>
> ph 916.785.4528
> fx 916.785.1196
> 
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