[Valgrind-users] Memcheck: the `impossible' happened

[<sa...@lu...>]

Hi,

What does this error mean?

Memcheck: the `impossible' happened:
   add_MAC_chunk: shadow area is accessible
Basic block ctr is approximately 111850000

Is it clear indication that something is wrong in my application or is it i=
ndication that I=92m doing something that is not fully supported by Valgrin=
d tool? My application seems to be stable and I have not noticed any leakag=
e using other tools. The application is using commercial in memory database=
, which is using shared memory to store the data. When I comment out the pa=
rts that are using the IMDB from the application I don=92t get the error.=
=20

Has anyone else run into this kind of problem? I can submit more details if=
 some one wants to study the issue.

As a temporary solution I simply commented out "paranoid" check generating =
the error message (lines 146 - 148 from memcheck/mac_malloc_wrappers.c file=
), at least I can now get leak summary when application exits.

BR, Sami


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