Problems writing ELF dumps with makedumpfile 1.2.9

[Worth, Kevin]

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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