[Crash-utility] The problems when running SuSE 12 on VirtualBox

[Dave Anderson]

----- Original Message -----
> On 11/19/2015 08:37 AM, David Mair wrote:
> > On 11/19/2015 07:45 AM, Dave Anderson wrote:
> > 
> > Hi Dave,
> > 
> >> ----- Original Message -----
> > <snip>
> >>
> >>> (2) Execute "crash -d8" on physical machine will cause crash utility core
> >>> dump.
> >>
> >> I can reproduce this, so I'll look into it.  It's related to the /dev/mem
> >> "test"
> >> to determine whether the kernel was configured with CONFIG_STRICT_DEVMEM,
> >> where
> >> it tries to read from pfn 257 (just above the CONFIG_STRICT_DEVMEM limit),
> >> but
> >> gets into an infinite loop when used in conjunction with -d.
> >>
> >> Anyway, just continue to use /proc/kcore and you should be fine.
> > 
> > This is the cause in readmem():
> > 
> > switch(READMEM(...))
> > {
> > 	.
> > 	.
> > 	.
> > case READ_ERROR:
> > 	if (PRINT_ERROR_MESSAGE) ********** THIS ***********
> > 	{
> > 		causes a nested readmem() call before the goto gives it
> > 		to the caller to deal with
> > 	}
> > 	goto readmem_error
> > }
> > 	.
> > 	.
> > 	.
> > switch(error_handle)
> > {
> > 	case (RETURN_ON_ERROR):
> > }
> > 
> > The PRINT_ERROR_MESSAGE I assume is an escalation from -d 8 in this case.
> > 
> 
> The whole switch_to_proc_kcore() probably shouldn't be conditional on
> the presence of PRINT_ERROR_MESSAGE, only the actual error message
> should be.
> 
> Patch shortly.

Exactly -- I was just about to send out a long-winded explanation but saw
this response. 

Thanks for debugging this!

Dave