Please read the src/extra/zlib/deflate.c from line 1078: this is deliberate use of lookahead and explained there. Valgrind is making a correct comment but the report is not of an error.
On Tue, 25 Jul 2006, [EMAIL PROTECTED] wrote: > valgrind complains about the save command in R 2.3.1 as shown by the > script included below. Of course, I don't know whether this "Conditional > jump or move depends on uninitialised value(s)" is really a bug. > Experience with similar issues in my own code says it may be, but it > is also hard to tell. Having no familiarity with the code cited > in deflate.c, I leave the issue to experts. Just thought someone > should know. Note that despite the printout in foo.Rout being a bit > unclear about exactly where the purported bug occurs, there is no error > reported in bar.Rout which does not have the save command. > > Irrelevant to the bug, but this was originally spotted when package > checking the aster package, which happened to have a save in tests/predict.R. > > Script started on Tue 25 Jul 2006 09:59:59 AM CDT > oak$ cat /etc/SuSE-release > SUSE LINUX 10.1 (X86-64) > VERSION = 10.1 > oak$ export VALGRIND_OPTS="--tool=memcheck" > oak$ R CMD BATCH --vanilla --debugger=valgrind foo.R > oak$ R CMD BATCH --vanilla --debugger=valgrind bar.R > oak$ cat foo.R > > foo <- 2 > save(foo, file = "foo.Rdata") > > oak$ cat foo.Rout > ==13521== Memcheck, a memory error detector. > ==13521== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al. > ==13521== Using LibVEX rev 1575, a library for dynamic binary translation. > ==13521== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP. > ==13521== Using valgrind-3.1.1, a dynamic binary instrumentation framework. > ==13521== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al. > ==13521== For more details, rerun with: -v > ==13521== > > R : Copyright 2006, The R Foundation for Statistical Computing > Version 2.3.1 (2006-06-01) > ISBN 3-900051-07-0 > > R is free software and comes with ABSOLUTELY NO WARRANTY. > You are welcome to redistribute it under certain conditions. > Type 'license()' or 'licence()' for distribution details. > > Natural language support but running in an English locale > > R is a collaborative project with many contributors. > Type 'contributors()' for more information and > 'citation()' on how to cite R or R packages in publications. > > Type 'demo()' for some demos, 'help()' for on-line help, or > 'help.start()' for an HTML browser interface to help. > Type 'q()' to quit R. > > ==13521== Conditional jump or move depends on uninitialised value(s) > ==13521== at 0x5D2740: longest_match (deflate.c:1121) > ==13521== by 0x5D3BB6: deflate_slow (deflate.c:1595) > ==13521== by 0x5D30EB: deflate (deflate.c:790) > ==13521== by 0x5D4D21: do_flush (gzio.c:757) > ==13521== by 0x5D4F39: gzclose (gzio.c:991) > ==13521== by 0x44AC22: gzfile_close (connections.c:1035) > ==13521== by 0x44A703: con_close1 (connections.c:2256) > ==13521== by 0x44A742: con_close (connections.c:2283) > ==13521== by 0x44D3A3: do_close (connections.c:2303) > ==13521== by 0x4C43BB: do_internal (names.c:1089) > ==13521== by 0x4978F5: Rf_eval (eval.c:398) > ==13521== by 0x497F0D: Rf_evalList (eval.c:1400) > > invisible(options(echo = TRUE)) > > > > foo <- 2 > > save(foo, file = "foo.Rdata") > > > > > > proc.time() > [1] 22.509 0.216 21.774 0.004 0.004 > > > ==13521== > ==13521== ERROR SUMMARY: 9 errors from 1 contexts (suppressed: 12 from 1) > ==13521== malloc/free: in use at exit: 22,019,365 bytes in 10,911 blocks. > ==13521== malloc/free: 37,822 allocs, 26,911 frees, 55,922,125 bytes > allocated. > ==13521== For counts of detected errors, rerun with: -v > ==13521== searching for pointers to 10,911 not-freed blocks. > ==13521== checked 18,666,336 bytes. > ==13521== > ==13521== LEAK SUMMARY: > ==13521== definitely lost: 667 bytes in 35 blocks. > ==13521== possibly lost: 0 bytes in 0 blocks. > ==13521== still reachable: 22,018,698 bytes in 10,876 blocks. > ==13521== suppressed: 0 bytes in 0 blocks. > ==13521== Use --leak-check=full to see details of leaked memory. > oak$ cat bar.R > > foo <- 2 > > oak$ cat bar.Rout > ==13534== Memcheck, a memory error detector. > ==13534== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al. > ==13534== Using LibVEX rev 1575, a library for dynamic binary translation. > ==13534== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP. > ==13534== Using valgrind-3.1.1, a dynamic binary instrumentation framework. > ==13534== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al. > ==13534== For more details, rerun with: -v > ==13534== > > R : Copyright 2006, The R Foundation for Statistical Computing > Version 2.3.1 (2006-06-01) > ISBN 3-900051-07-0 > > R is free software and comes with ABSOLUTELY NO WARRANTY. > You are welcome to redistribute it under certain conditions. > Type 'license()' or 'licence()' for distribution details. > > Natural language support but running in an English locale > > R is a collaborative project with many contributors. > Type 'contributors()' for more information and > 'citation()' on how to cite R or R packages in publications. > > Type 'demo()' for some demos, 'help()' for on-line help, or > 'help.start()' for an HTML browser interface to help. > Type 'q()' to quit R. > > > invisible(options(echo = TRUE)) > > > > foo <- 2 > > > > > > proc.time() > [1] 22.169 0.204 21.422 0.004 0.004 > > > ==13534== > ==13534== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 12 from 1) > ==13534== malloc/free: in use at exit: 21,998,613 bytes in 10,896 blocks. > ==13534== malloc/free: 37,788 allocs, 26,892 frees, 55,576,442 bytes > allocated. > ==13534== For counts of detected errors, rerun with: -v > ==13534== searching for pointers to 10,896 not-freed blocks. > ==13534== checked 18,645,696 bytes. > ==13534== > ==13534== LEAK SUMMARY: > ==13534== definitely lost: 667 bytes in 35 blocks. > ==13534== possibly lost: 0 bytes in 0 blocks. > ==13534== still reachable: 21,997,946 bytes in 10,861 blocks. > ==13534== suppressed: 0 bytes in 0 blocks. > ==13534== Use --leak-check=full to see details of leaked memory. > oak$ exit > > Script done on Tue 25 Jul 2006 10:03:20 AM CDT > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
