On Tue, 2013-03-26 at 14:30 +0100, Jonatan Wallmander wrote:
> Feature-request:
> Add backtrace to output for these warnings:
> "Warning: set address range perms: large range
> [0x4c339040, 0x206094130) (undefined)"
Probably not difficult to implement, however, see below ...
>
>
> Explanation:
>
> This was a large allocation which ate up all my memory when debugging
> with valgrind making it hard for me to find where it happened.
>
> The reason was an undefined integer in a class (uninitialized memory).
However, the root cause is that Valgrind should report an error when
malloc is called with a undefined size argument.
>
> Valgrind only gives this one line warning (which is good), but
> it would also be nice if it would give a backtrace for this...
>
> Might have helped me to track down this bug sooner :)
The 'large range' message was produced thanks to some luck.
The best would be to file a bug in bugzilla, for the false negative
caused by code such as:
{
size_t undef;
char *p = malloc (undef);
}
Thanks
Philippe
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