tests: adjust recent changes to virtual memory limits

* tests/dd/no-allocate.sh: Account for timeout(1) when
determining the required mem, as timeout has additional shared libs.
This avoids the need for the hardcoded 4M addition to the limit.
* tests/misc/head-c.sh: Increase the base limit, to account for
the fact that head(1) will allocate some additional mem in this case.
* tests/misc/cut-huge-range.sh: Remove mention of specific limits.
* tests/misc/printf-surprise.sh: Likewise.
Reported by Dmitry V. Levin

3 files changed, 3 insertions, 4 deletions

diff --git a/tests/misc/cut-huge-range.sh b/tests/misc/cut-huge-range.sh
index 4df2fc066..633ca8572 100755
--- a/tests/misc/cut-huge-range.sh
+++ b/tests/misc/cut-huge-range.sh
@@ -50,7 +50,7 @@ subtract_one='
 CUT_MAX=$(echo $SIZE_MAX | sed "$subtract_one")
 
 # From coreutils-8.10 through 8.20, this would make cut try to allocate
-# a 256MiB bit vector.  With a 20MB limit on VM, the following would fail.
+# a 256MiB bit vector.
 (ulimit -v $vm && : | cut -b$CUT_MAX- > err 2>&1) || fail=1
 
 # Up to and including coreutils-8.21, cut would allocate possibly needed
diff --git a/tests/misc/head-c.sh b/tests/misc/head-c.sh
index ab821ac61..0c63e3a90 100755
--- a/tests/misc/head-c.sh
+++ b/tests/misc/head-c.sh
@@ -42,7 +42,7 @@ esac
 # Only allocate memory as needed.
 # Coreutils <= 8.21 would allocate memory up front
 # based on the value passed to -c
-(ulimit -v $vm && head --bytes=-$SSIZE_MAX < /dev/null) || fail=1
+(ulimit -v $(($vm+1000)) && head --bytes=-$SSIZE_MAX < /dev/null) || fail=1
 
 # Make sure it works on funny files in /proc and /sys.
 
diff --git a/tests/misc/printf-surprise.sh b/tests/misc/printf-surprise.sh
index 8480693fc..f098bc13d 100755
--- a/tests/misc/printf-surprise.sh
+++ b/tests/misc/printf-surprise.sh
@@ -59,8 +59,7 @@ cleanup_() { kill $pid 2>/dev/null && wait $pid; }
 
 head -c 10 fifo > out & pid=$!
 
-# Choosing the virtual memory limit, 11000 is enough, but 10000 is too
-# little and provokes a "memory exhausted" diagnostic on FreeBSD 9.0-p3.
+# Trigger large mem allocation failure
 ( ulimit -v $vm && env $prog %20000000f 0 2>err-msg > fifo )
 exit=$?