[Crash-utility] [PATCH v3 0/9] teach crash to work with "live" ramdump

[Dave Anderson]

----- Original Message -----
> n 05/04, Dave Anderson wrote:
> >
> > Hi Oleg,
> >
> > The v3 patchset has been queued for crash-7.1.6:
> >
> >   https://github.com/crash-utility/crash/commit/89ed9d0a7f7da4578294a492c1ad857244ce7352
> >
> > I added some documentation in help.c for "crash -h", and in the crash.8 man
> > page.
> > Also, I changed ACTIVE() to LOCAL_ACTIVE() in the x86_64_calc_phys_base()
> > function,
> > so phys_base will default to 0 instead of being based upon the host
> > kernel's.
> 
> Great, thanks!
> 
> > So the next stage should be support for creation of a permanent ELF vmcore
> > from
> > one of these QEMU ramdumps with "crash -o".  AFAICT, it should simply be a
> > matter
> > of adding this to ramdump_to_elf():
> >
> > --- crash-7.1.5/ramdump.c.orig
> > +++ crash-7.1.5/ramdump.c
> > @@ -186,6 +186,8 @@ char *ramdump_to_elf(void)
> >  		e_machine = EM_AARCH64;
> >  	else if (machine_type("MIPS"))
> >  		e_machine = EM_MIPS;
> > +	else if (machine_type("X86_64"))
> > +		e_machine = EM_X86_64;
> >  	else
> >  		error(FATAL, "ramdump: unsupported machine type: %s\n",
> >  			MACHINE_TYPE);
> 
> Works for me ;)
> 
> Tested with and without the "-o" option.
> 
> 	$ ./crash ../VMLINUX /tmp/MEM at 0
> 	...
> 	$ ./crash ../VMLINUX /tmp/MEM at 0 -o /tmp/dump
> 	...
> 	$ ./crash ../VMLINUX /tmp/dump
> 
> everything seems to work.
> 
> 
> > It would be best if it were with a crashed guest
> > image.
> 
> yes, search-for-panicked-task works too.
> 
> > but I will need a pointer to a ramdump image that
> > I can work with.
> 
> so everything seems to work, but if you want to play with my ramdump too you
> can find the following files in http://people.redhat.com/onestero/for_dave/
> 
> 	VMLINUX				# well, vmlinux ;)
> 	MEM				# RAM dump before panic
> 	MEM_AFTER_CRASH			# RAM dump after init (bash with pid==1) exits
> 
> Oleg.

Thanks Oleg -- I've got them...

And that patch is also queued for crash-7.1.6:

  https://github.com/crash-utility/crash/commit/67a815b8749fbd5c99c29d24b4e699b1d618ddbf

Dave