We recently started noticing freezes that appear only on 32bit systems
(both linux and windows) with a relatively recent versions of R 3.2.0,
including the RC. It looks like the problem can be traced back to the use
of R_ObjectTables (see R_ext/Callbacks.h)
The problem is a bit difficult to reproduce because it does not appear on
x64 and because the official R interface to this functionality, the
RObjectTables package from OmegaHat, is no longer maintained. I created a
slightly updated version of RObjectTables package (added a NAMESPACE file)
to reproduce the problem:
devtools::install_github("jeroenooms/RObjectTables")
The problem can be triggered using the included example from the
DirectoryObjectTable manual.
library(RObjectTables)
db <- DirectoryObjectTable(tempdir())
dbwrite(db, "x", 1:10)
dbwrite(db, "y", letters[1:3])
dbobjects(db)
dbread(db, "x")
attach(newRFunctionTable(db), name = "myRData")
Things work as expected up till dbread(), but once the object-table is
attached, R freezes on 32bit whereas it works as expected on 64bit.
The same problem appears for other packages that are calling the object
tables C interfaces directly without using the RObjectTables R package.
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