diff --git a/com.oracle.truffle.r.native/gnur/tests/src/Examples/base-Ex.R b/com.oracle.truffle.r.native/gnur/tests/src/Examples/base-Ex.R
index c23dd0c01448592e36d1328b5d4894923dc13d09..0617ad605aae94bb2fe937fc911ddc30da5a9ca5 100644
--- a/com.oracle.truffle.r.native/gnur/tests/src/Examples/base-Ex.R
+++ b/com.oracle.truffle.r.native/gnur/tests/src/Examples/base-Ex.R
@@ -3881,6 +3881,7 @@ env$logic <- c(TRUE, FALSE, FALSE, TRUE)
 # what have we there?
 utils::ls.str(env)
 
+if(FALSE) { # [FastR] BEGIN Test snippet disabled since it causes fastr_errors.log increase by 500MB
 # compute the mean for each list element
        eapply(env, mean)
 unlist(eapply(env, mean, USE.NAMES = FALSE))
@@ -3888,6 +3889,7 @@ unlist(eapply(env, mean, USE.NAMES = FALSE))
 # median and quartiles for each element (making use of "..." passing):
 eapply(env, quantile, probs = 1:3/4)
 eapply(env, quantile)
+} # [FastR] END Test snippet disabled since it causes fastr_errors.log increase by 500MB
 
 
 
@@ -4121,11 +4123,13 @@ x <- seq(0, 10, length.out = 100)
 y <- seq(-1, 1, length.out = 20)
 d1 <- expand.grid(x = x, y = y)
 d2 <- expand.grid(x = x, y = y, KEEP.OUT.ATTRS = FALSE)
+if(FALSE) { # [FastR] BEGIN Test snippet disabled since it causes fastr_errors.log increase by 500MB
 object.size(d1) - object.size(d2)
 ##-> 5992 or 8832 (on 32- / 64-bit platform)
 ## Don't show: 
 stopifnot(object.size(d1) > object.size(d2))
 ## End(Don't show)
+} # [FastR] BEGIN Test snippet disabled since it causes due to fastr_errors.log increase by 500MB
 
 
 
diff --git a/com.oracle.truffle.r.native/gnur/tests/src/Examples/utils-Ex.R b/com.oracle.truffle.r.native/gnur/tests/src/Examples/utils-Ex.R
index 32e43e71c79a807b1617f21720a7ba043d948e5c..e5051cac661e376ae63d7d2a16df552578ed8650 100644
--- a/com.oracle.truffle.r.native/gnur/tests/src/Examples/utils-Ex.R
+++ b/com.oracle.truffle.r.native/gnur/tests/src/Examples/utils-Ex.R
@@ -1870,8 +1870,10 @@ stopifnot(identical( ## assert that all three are the same :
              format(round(as.vector(sl)/1024, 1))))
 
 ## find the 10 largest objects in the base package
+if(FALSE) { # [FastR] BEGIN Test snippet disabled since it causes fastr_errors.log increase by 200MB
 z <- sapply(ls("package:base"), function(x)
             object.size(get(x, envir = baseenv())))
+} # [FastR] BEGIN Test snippet disabled since it causes fastr_errors.log increase by 200MB
 if(interactive()) {
 as.matrix(rev(sort(z))[1:10])
 } else # (more constant over time):
diff --git a/mx.fastr/mx_fastr.py b/mx.fastr/mx_fastr.py
index 4697dc4692c31be457944eb40835db13a5385c61..08bbcb01fad46c583799c81fd838566e2ff61749 100644
--- a/mx.fastr/mx_fastr.py
+++ b/mx.fastr/mx_fastr.py
@@ -465,6 +465,8 @@ def gnu_rtests(args, env=None):
     os.chdir(_fastr_suite.dir) # Packages install fails otherwise
  #   mx_fastr_pkgs.installpkgs(['--pkg-pattern', '^MASS$']) # required by tests/Examples/base-Ex.R
     np = mx.project('com.oracle.truffle.r.native')
+    ferrs = join(_fastr_suite.dir, 'fastr_errors.log')
+    ferrs_size = os.stat(ferrs).st_size if os.access(ferrs, os.R_OK) else 0
     tst = join(np.dir, 'gnur', 'tests')
     tstsrc = join(tst, 'src')
     tstlog = join(tst, 'log')
@@ -488,6 +490,12 @@ def gnu_rtests(args, env=None):
                     os.rename(outf, outff)
                     print 'Running {} explicitly by GnuR CMD BATCH ...'.format(f)
                     mx.run([join(_gnur_path(), 'R'), '--vanilla', 'CMD', 'BATCH', join(srcd, f)] + args, nonZeroIsFatal=False, env=env, timeout=90)
+                    ferrs_new_size = os.stat(ferrs).st_size if os.access(ferrs, os.R_OK) else 0
+                    if ferrs_new_size - ferrs_size > 0:
+                        with open(ferrs) as f:
+                            nlines = sum(1 for _ in f)
+                        print '  Size of {} increased to {:,} bytes ({:,} lines).\n'.format(ferrs, ferrs_new_size, nlines)
+                        ferrs_size = ferrs_new_size
                     if os.path.isfile(outf):
                         outfg = outf + '.gnur'
                         os.rename(outf, outfg)