Thanks Marc.
There are a lot of things that we do inside of Dyninst that sometimes
seem pretty hard ... and that work pretty well. And sometimes they
don't ...
For this issue, we definitely have code that evolved with incremental
changes and no clear overview. So, we're going to back up a
I am not sure whether we should jump from v1 to v2 at all. If you got
any kind of state, moving from v1 to v2 is just asking for trouble.
The more I think about it, the more I believe that it is at least very
very hard to do right. (But I would be more than happy to be put right)
Actually, si
Nice find, Marc. I admire the bug.
The problem here, I think, is that going relocated->original->relocated
is a lossy transformation; what we want to be able to do is go from
relocated v1 to relocated v2 directly so that we don't wind up getting
rewound to the beginning of instrumentation. (Al
I found the problem, but I do not really know how to solve it:
1. A springboard overwrites 3 instructions.
2. The PC of the thread is at the second instruction.
3. The PC of the thread is not changed, because the TrackerElement was
merged in CodeTracker::addTracker
4. The thread continues and c
Hi all,
if I deleteSnippet, does the relocation code get deleted as well? Or do the
relocated code regions get reused?
If yes, where? I was unable to find anything.
I insert and delete snippets quite a lot. Sometimes I will end up with threads
pointing into broken relocation regions. And I don’
of Marc Brünink
Sent: Tuesday, November 17, 2015 9:08 PM
To: dyninst-api@cs.wisc.edu
Subject: Re: [DynInst_API:] Deleting snippets
Hi,
I think I never got an answer to this one, did I?
-> Is it safe to delete snippets while a thread is executing them?
I suppose not. BPatchAddressSp
with memory, you can wrap
your snippets in conditionals that enable/disable them as needed.
From: Dyninst-api on behalf of Marc Brünink
Sent: Tuesday, November 17, 2015 9:08 PM
To: dyninst-api@cs.wisc.edu
Subject: Re: [DynInst_API:] Deleting snippets
Hi
Hi,
I think I never got an answer to this one, did I?
-> Is it safe to delete snippets while a thread is executing them?
I suppose not. BPatchAddressSpace::deleteSnippet also seems to support the “no,
not safe” assumption.
So what is the best practice to delete a snippet?
Currently I just disab
Dear all,
is it safe to delete a snippet while a thread is actually executing the
snippet?
If not, what is the current best practice to delete a snippet?
Kind regards,
Marc
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