Messages in this thread | | | Date | Mon, 14 Jan 2019 15:26:32 -0500 (EST) | From | Dave Anderson <> | Subject | Re: [PATCH 1/2 v6] kdump: add the vmcoreinfo documentation |
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----- Original Message ----- > On Mon, Jan 14, 2019 at 03:07:33PM -0500, Dave Anderson wrote: > > That's what it *does* utilize -- it takes a standalone vmcore dumpfile, and > > pulls out the OSRELEASE string from it, so that a user can determine what > > vmlinux file should be used with that vmcore for normal crash analysis. > > And the vmcoreinfo is part of the vmcore, right?
Correct.
> > So it can just as well read out the address of init_uts_ns and get the > kernel version from there.
No. It needs *both* the vmlinux file and the vmcore file in order to read kernel virtual memory, so just having a kernel virtual address is insufficient.
So it's a chicken-and-egg situation. This particular --osrelease option is used to determine *what* vmlinux file would be required for an actual crash analysis session.
Dave
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