rcache/grdma: try to prevent erroneous free error messages #4576
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It is possible to have parts of an in-use registered region be passed to munmap or madvise. This does not necessarily mean the user has made an error but does mean the entire region should be invalidated. This commit checks that the munmap or madvise base matches the beginning of the cached region. If it does and the region is in-use then we print an error. There will certainly be false-negatives where a user unmaps something that really is in-use but that is preferrable to a false-positive. References open-mpi#4509 Signed-off-by: Nathan Hjelm <[email protected]>
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It is possible to have parts of an in-use registered region be passed
to munmap or madvise. This does not necessarily mean the user has made
an error but does mean the entire region should be invalidated. This
commit checks that the munmap or madvise base matches the beginning of
the cached region. If it does and the region is in-use then we print
an error. There will certainly be false-negatives where a user
unmaps something that really is in-use but that is preferrable to a
false-positive.
References #4509
Signed-off-by: Nathan Hjelm [email protected]