diff --git a/tests/test-hup-parser.sh b/tests/test-hup-parser.sh
new file mode 100644
index 0000000..26b8f43
--- /dev/null
+++ b/tests/test-hup-parser.sh
@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# Inert parser controls only; no production code, network or real credentials.
+unset GH_TOKEN GITHUB_TOKEN SSH_PRIVATE_KEY_B64
+root=$(mktemp -d)
+cleanup() { rm -rf -- "$root"; }
+trap cleanup EXIT
+command -v timeout >/dev/null
+printf "DIAG: parser controls bash=%s\n" "$BASH_VERSION"
+cat > "$root/child.sh" <<\CHILD
+#!/usr/bin/env bash
+set -euo pipefail
+handler() { : > "$ready.handled"; exit 129; }
+mode=$1
+ready=$2
+trap handler HUP
+: > "$ready"
+end=$((SECONDS + 2))
+case "$mode" in
+    plain) while (( SECONDS < end )); do :; done ;;
+    command) while (( SECONDS < end )); do value=$(printf x); [[ $value == x ]]; done ;;
+    snapshot) while (( SECONDS < end )); do active_jobs=$(jobs -pr); while IFS= read -r value; do :; done <<< "$active_jobs"; done ;;
+    process) while (( SECONDS < end )); do while IFS= read -r value; do :; done < <(jobs -pr); done ;;
+    *) exit 90 ;;
+esac
+# Reaching this point means no HUP was handled; never count it as success.
+exit 91
+CHILD
+cat > "$root/controller.sh" <<\CONTROL
+#!/usr/bin/env bash
+set -euo pipefail
+root=$1 mode=$2 round=$3 delay=$4
+ready="$root/ready-$mode-$round"
+# Signal only the short-lived direct fixture child after its readiness marker.
+env --default-signal=HUP,INT,TERM bash "$root/child.sh" "$mode" "$ready" &
+child=$!
+end=$((SECONDS + 2))
+while [[ ! -f $ready ]] && (( SECONDS < end )); do sleep 0.001; done
+if [[ ! -f $ready ]]; then
+    wait "$child" || true
+    exit 92
+fi
+sleep "$delay"
+kill -HUP "$child"
+status=0
+wait "$child" || status=$?
+printf "DIAG: mode=%s round=%s delay=%s exit=%s\n" "$mode" "$round" "$delay" "$status"
+[[ $status == 129 && -f $ready.handled ]]
+CONTROL
+# 3 modes x 6 cases, at most 5 seconds per case (including forced teardown).
+# Do not retry failures. Delay varies delivery, not a claim of exact parser timing.
+# Legacy process mode already reproduced EOF in run 34226553908.
+# Keep it available explicitly; the default gate validates the replacement.
+modes="plain command snapshot"
+if [[ ${HUP_PARSER_INCLUDE_LEGACY:-false} == true ]]; then modes="$modes process"; fi
+for mode in $modes; do
+    round=0
+    for delay in 0 0.001 0.005 0.01 0.02 0.05; do
+        round=$((round + 1))
+        timeout --signal=TERM --kill-after=1s 4s bash "$root/controller.sh" "$root" "$mode" "$round" "$delay"
+    done
+done
+printf "PASS: all selected bounded HUP parser controls\n"
diff --git a/tests/test-push-worker-registration.sh b/tests/test-push-worker-registration.sh
index db007b5..ee5bb3b 100755
--- a/tests/test-push-worker-registration.sh
+++ b/tests/test-push-worker-registration.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 set -euo pipefail
+# Safe runtime identity only: no environment dump, credentials, or xtrace.
+printf "DIAG: bash=%s kernel=%s\n" "$BASH_VERSION" "$(uname -r)"
+dpkg-query -W bash libc6 2>/dev/null || true
 
 ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
 readonly ROOT_DIR
@@ -82,6 +85,19 @@ printf source-safe
 assert_eq source-safe "$source_result" "source keeps zero runtime side effects"
 # shellcheck source=../tools/push.sh
 source "$SCRIPT"
+(
+    # Inert direct-child job table: no SSH or production services.
+    sleep 10 & snapshot_child=$!
+    cleanup_snapshot_child() { kill -TERM "$snapshot_child" 2>/dev/null || true; wait "$snapshot_child" 2>/dev/null || true; }
+    trap cleanup_snapshot_child EXIT
+    job_is_active "$snapshot_child" || fail "snapshot misses active direct child"
+    if job_is_active 0; then fail "snapshot accepts absent PID"; fi
+    kill -TERM "$snapshot_child"
+    wait "$snapshot_child" 2>/dev/null || true
+    if job_is_active "$snapshot_child"; then fail "snapshot retains reaped child"; fi
+    trap - EXIT
+    pass "job snapshot preserves direct-child matching and reap semantics"
+)
 trap 'rm -rf "$TEST_DIR"' EXIT
 
 setup_fixture() {
@@ -1435,7 +1451,7 @@ run_state_publication_signal_case() (
     }
     trap cleanup_publication_fixture EXIT
     mode=active; [[ "$state" == cleanup_failed ]] && mode=cleanup
-    root="$TEST_DIR/state-publish-$state-$phase-$signal_name"; CURRENT_FIXTURE_ROOT=$root
+    root="$TEST_DIR/state-publish-$state-$phase-$signal_name${5:-}"; CURRENT_FIXTURE_ROOT=$root
     write_active_grace_fixture "$root"
     mkdir -m 0700 "$root/capture"
     marker="$root/capture/publish-marker"
@@ -1453,6 +1469,8 @@ run_state_publication_signal_case() (
     [[ "$worker_pid" =~ ^[1-9][0-9]*$ && "$worker_start" =~ ^[1-9][0-9]*$ && "$managed_sid" =~ ^[1-9][0-9]*$ ]] || fail "$state/$phase/$signal_name marker identity malformed"
     wait_test_process_identity_present "$worker_pid" "$worker_start" || { cat "$marker" >&2; fail "$state/$phase/$signal_name worker identity missing at hook"; }
     test_watchdog_process 30 "$root/watchdog-timeout" "$main_pid" & watchdog=$!; watchdog_start=$(wait_test_process_start "$watchdog")
+    printf "DIAG: publication state=%s phase=%s signal=%s main=%s/%s worker=%s/%s sid=%s\n" \
+        "$state" "$phase" "$signal_name" "$main_pid" "$main_start" "$worker_pid" "$worker_start" "$managed_sid"
     kill "-$signal_name" "$main_pid"; wait "$main_pid" || rc=$?
     kill -TERM "$watchdog" 2>/dev/null || true; wait "$watchdog" 2>/dev/null || true
     [[ ! -e "$root/watchdog-timeout" ]] || fail "$state/$phase/$signal_name watchdog fired"
@@ -1490,6 +1508,11 @@ for publication_state in $publication_states; do
 done
 
 (
+    # Three bounded extra probes; preserve original matrix and stop at first failure.
+    for diagnostic_round in 1 2 3; do
+        printf "DIAG: extra HUP probe=%s/3\n" "$diagnostic_round"
+        run_state_publication_signal_case cleanup_failed after-rename HUP 129 "-probe-$diagnostic_round"
+    done
     root="$TEST_DIR/normal-parallel"; setup_fixture "$root"
     : > "$root/capture/current"; : > "$root/capture/max"
     push_to_server() {
diff --git a/tools/push.sh b/tools/push.sh
index 3a4ac17..b578441 100755
--- a/tools/push.sh
+++ b/tools/push.sh
@@ -941,10 +941,13 @@ process_identity_matches() {
 }
 
 job_is_active() {
-    local expected="$1" pid
+    local expected="$1" pid active_jobs
+    # Bash 5.2 can report a trap parser EOF when HUP interrupts process substitution.
+    # Snapshot the inherited job table without process substitution or word splitting.
+    active_jobs=$(jobs -pr) || return 1
     while IFS= read -r pid; do
         [[ "$pid" == "$expected" ]] && return 0
-    done < <(jobs -pr)
+    done <<< "$active_jobs"
     return 1
 }