[R-pkg-devel] Debugging Clang ASAN errors

Martin R. Smith m@rt|n@@m|th @end|ng |rom durh@m@@c@uk
Fri Jul 3 12:17:55 CEST 2020

A package I recently had accepted to CRAN is throwing up a "memory not
mapped" segfault on CRAN's post-acceptance fedora-clang ASAN test.  This
error does not occur with debian-clang or gcc.
(Check results:

I found a similar issue in the r-packages archives (
https://stat.ethz.ch/pipermail/r-package-devel/2018q3/002907.html). The
suggestion in that case was that the issue may have been a false positive,
a possibility that is consistent with a "HINT" in the output log.

I optimistically suspect that this is the case here too: my package is an R
wrapper to a mature C library, and the segmentation fault arises during a
routine operation with simple input, not in some obscure corner case.  So
question one is: how might I confirm that this is indeed a false positive?

If it's not a false positive, then this raises the question of how I might
reproduce it, as a Windows user without access to a machine running Fedora.
rhub::check_with_sanitizers() uses debian, and returns 'success':
Rocker (https://github.com/rocker-org/rocker) only offers a debian (not
fedora) environment, so looks like it will not reproduce the error.

Any thoughts would be gratefully received!




*Dr. Martin R. Smith*
Assistant Professor in Palaeontology
Durham University
Department of Earth Sciences
Mountjoy Site, South Road, Durham, DH1 3LE United Kingdom

*T*: +44 (0)191 334 2320
*M*: +44 (0)774 353 7510
*E*: martin.smith using durham.ac.uk


The information in this e-mail and any attachments is co...{{dropped:13}}

More information about the R-package-devel mailing list