On Sun, Feb 6, 2011 at 10:14 PM, Bart Van Assche <[email protected]> wrote:
> On Sat, Feb 5, 2011 at 5:54 PM, Konstantin Serebryany <
> [email protected]> wrote:
>
>>
>> On Sat, Feb 5, 2011 at 7:36 PM, Bart Van Assche <[email protected]>wrote:
>>
>>> On Sat, Feb 5, 2011 at 2:22 PM, Konstantin Serebryany <
>>> [email protected]> wrote:
>>>
>>>> FYI
>>>> ThreadSanitizer will not report anything on this test, even with
>>>> --free-is-write (which is on by default) because this tool assumes the
>>>> malloc implementation to be correct and ignores every access inside malloc
>>>> and friends.
>>>> I haven't seen any false positives due to --free-is-write (in
>>>> ThreadSanitizer) over last ~6 months, but we found tons of real races with
>>>> this flag. Just a fresh example:
>>>> http://code.google.com/p/chromium/issues/detail?id=72042
>>>>
>>>
>>> Hello Konstantin,
>>>
>>> Has that --free-is-write feature already been tested in combination with
>>> custom memory allocators ?
>>>
>> What kind of custom memory allocators?
>> We regularly run it with programs linked against tcmalloc.
>>
>
> Hello Konstantin,
>
> With "custom memory allocators" I was referring to those using the
> VG_USERREQ__MALLOCLIKE_BLOCK and VG_USERREQ__FREELIKE_BLOCK client requests
> and not to those that replace malloc() like e.g. tcmalloc.
>
ThreadSanitizer does not support VG_USERREQ__FREELIKE_BLOCK -- never found
a use for it yet.
However if a program uses a lot of custom free lists it could be useful (and
it will be trivial to implement).
--kcc
> Bart.
>
>
>
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