diff --git a/justfile b/justfile
index 47f6878..54c9863 100644
--- a/justfile
+++ b/justfile
@@ -27,10 +27,10 @@ docker-push: docker-build
   docker push {{tag}}
 
 docker-measure what:
-  docker run --rm -ti --platform 'linux/amd64' -v "$PWD:{{mount}}" {{tag}} just measure {{what}}
+  docker run --privileged --rm -ti --platform 'linux/amd64' -v "$PWD:{{mount}}" {{tag}} just measure {{what}}
 
 docker-measure-all:
-  docker run --rm -ti --platform 'linux/amd64' -v "$PWD:{{mount}}" {{tag}} just measure-all
+  docker run --privileged --rm -ti --platform 'linux/amd64' -v "$PWD:{{mount}}" {{tag}} just measure-all
 
 _all:
   just -l | grep -v 'build-all' | grep 'build-' | cut -d'-' -f2- | xargs
@@ -58,7 +58,7 @@ run what:
 
 measure what:
   #!/usr/bin/env bash
-  set -euxo pipefail
+  set -euo pipefail
   just build {{what}}
   slow_langs=(
     cobol
@@ -81,6 +81,8 @@ measure what:
       fi
   done
 
+  set -x
+
   mkdir -p results
   out="results/{{what}}.json"
 
@@ -91,7 +93,7 @@ measure what:
     jq '. += {"size":"'"$(cat SIZE)"'"}' "$out" | sponge "$out"
   fi
 
-  gdb -return-child-result --command rss.gdb --args $(cat CMD) >/dev/null
+  gdb --command rss.gdb --args $(cat CMD) >/dev/null
   jq '. += {"rss":'$(( $(rg -oPr '$1' 'Rss:\s*(\d+)' ./rss.txt) * 1024 ))'}' "$out" | sponge "$out"
 
 measure-all:
@@ -200,7 +202,7 @@ build-scala: (_check "scalac scala") && (_size "count.class" "count$.class" "cou
   scalac -version > VERSION 2>&1
   scala -version >> VERSION 2>&1
   scalac count.scala
-  echo 'scala count {{i}}' > CMD
+  echo 'bash '$(which scala)' count {{i}}' > CMD
 
 build-kotlin: (_check "kotlinc java") && (_size "count.jar") (_sizet "bytecode")
   kotlinc -version > VERSION 2>&1
@@ -254,7 +256,7 @@ build-php: (_check "php")
 build-erlang: (_check "erlc erl") && (_size "count.beam") (_sizet "bytecode")
   erl -eval '{ok, Version} = file:read_file(filename:join([code:root_dir(), "releases", erlang:system_info(otp_release), "OTP_VERSION"])), io:fwrite(Version), halt().' -noshell > VERSION
   erlc count.erl
-  echo 'erl -noshell -s count start {{i}}' > CMD
+  echo 'sh '$(which erl)' -noshell -s count start {{i}}' > CMD
 
 build-crystal: (_check "crystal")
   crystal version | xargs > VERSION
@@ -277,7 +279,7 @@ build-julia: (_check "julia")
 
 build-coffeescript: (_check "coffee")
   coffee --version > VERSION
-  echo 'coffee ./count.coffee {{i}}' > CMD
+  echo 'node '$(which coffee)' ./count.coffee {{i}}' > CMD
 
 build-nim: (_check "nim") && (_size "count")
   nim --version | head -1 > VERSION
@@ -287,7 +289,7 @@ build-nim: (_check "nim") && (_size "count")
 build-prolog: (_check "swipl") && (_size "count")
   swipl --version > VERSION
   swipl -s count.pro -g "main" -t halt -- 1
-  echo './count {{i}}' > CMD
+  echo 'sh ./count {{i}}' > CMD
 
 build-smalltalk: (_check "gst")
   gst --version | head -1 > VERSION
diff --git a/rss.gdb b/rss.gdb
index 766c3e7..5d47c83 100644
--- a/rss.gdb
+++ b/rss.gdb
@@ -1,7 +1,8 @@
 # run this with:
 
 # catch program exit
-catch syscall exit
+catch syscall exit exit_group
+condition 1 $_thread == 1
 run
 
 # capture program pid
@@ -12,8 +13,9 @@ end
 # while it's still running, extract rss from /proc
 eval "shell cat /proc/%d/smaps_rollup > rss.txt", $pid
 
-# allow program to exit, and exit gdb
-# when gdb is run with the `-return-child-result` flag it will cause gdb to exit
-# with the same code the child did
-continue
-exit
+# TODO: rather than just terminating here it would be nice to let the program
+# continue and allow `-return-child-result` to set the exit code to catch any
+# unexpected errors. But weird things happen with multithreaded programs.
+# An alternative could be to check that the value in `$rdi` is `0`, since we're
+# catching the exit syscalls.
+quit