>> ----8<----
>> #define RZ_SZB (128)
>> char *sp = /* stack pointer value */;
>> char vbits[RZ_SZB] = {0};
>> VALGRIND_GET_VBITS(sp-RZ_SZB, vbits, RZ_SZB);
>> VALGRIND_MAKE_MEM_DEFINED(sp-RZ_SZB, RZ_SZB);
>> /* ... scan the red zone here ... */
>> VALGRIND_SET_VBITS(sp-RZ_SZB, vbits, RZ_SZB);
>> ----8<----
>
>I can try that, but really the problem isn't reading
>uninitialised values.
>
>My theory is gc is deleting reachable store: the actual bug is NOT
>reading some thing it should not be :)
...
>That would be nice but it is unclear. Consider: the only way**
>a GC could cause
>the problem of an over-write would be to delete a reachable object.
>
>** unless there were some stupid bug in the GC, I did have one: chasing
>pointers down with recursion .. blows the stack on a long enough list.
...
I understood that this GC is directly calling malloc/free for each
object
(so there is "GC pool management").
Then valgrind memcheck is (supposed to be) able to detect that GC is
freeing
a piece of memory, which is then dereferenced.
You might need to increase the
"list of freed objects but kept in a corner to detect such bugs"
by using the option
--freelist-vol=....
If GC is maintaining its own mempool, then valgrind mempool requests
needs to be used.
If the application is multi-threaded, it might also be a race condition.
You could try helgrind or drd.
Philippe
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