Re: [uml-devel] UML: Please help with __module_text_address crashing

[Boaz Harrosh <bharrosh@panasas.com>]

On 03/13/2012 05:22 PM, Richard Weinberger wrote:
> Am 14.03.2012 01:15, schrieb Boaz Harrosh:
>> I guess if you don't have it then you don't. The most reliable way for me to get
>> it is a simple "halt". I'm not able to ever shut down properly it reliably crashes
>> like:
>>
>> Kernel panic - not syncing: Kernel mode fault at addr 0x54, ip 0x6015c233
> 
> What is at addr 0x6015c233?
> "addr2line -e vmlinux 0x6015c233" shows it.
> 

linux-open-osd/arch/um/drivers/line.c:46


> Does it also happen with a vanilla kernel?
> 

Yes, you mean git checkout v3.2 Yes it's the same all the way back to 2.6.39 or so

I just did that I get the same as above: addr2line -e .build_um/vmlinux 0x600179b8
linux-open-osd/arch/um/drivers/line.c:46

>>
>> OK then I have a problem because I get the "access not permitted" on attaching to any of these
>> forks but the top most parent. (as sudo)
> 
> You cannot attach to them because they are already being ptrace()'ed by 
> the UML main thread.

right that what I thought.
so if I make a break point that happened in another fork will it trigger still? I guess
yes. But if anything goes wrong in any of the other forks, is there a way for me to break
that fork into the debugger and see what happened like a bt? 

My current theory is that Fedora became UML unfriendly is there some random-exec-mem thingy
I need to turn off?

> 
> Thanks,
> //richard

Thanks richard for your help
Boaz

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