From a1af81049be12531bf08412edccd83e921414743 Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Wed, 30 Sep 2026 02:34:16 -0400
Subject: guest-diag: run_cycle - verify live gdb before declaring arm failure

---
 tools/guest-diag/run_cycle.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/guest-diag/run_cycle.sh b/tools/guest-diag/run_cycle.sh
index 6786aa1..71db054 100755
--- a/tools/guest-diag/run_cycle.sh
+++ b/tools/guest-diag/run_cycle.sh
@@ -78,6 +78,13 @@ elif [ "$TRACE" = "gdb" ]; then
             ARMED=1
             break
         fi
+        # The launch exec can time out even though nohup gdb started; verify
+        # from the guest side before declaring the arm failed.
+        if timeout 20 "$VMEXEC" exec "pgrep -f 'gdb -p' >/dev/null && echo GDBOK" 2>/dev/null | grep -q GDBOK; then
+            echo "    arm attempt $a: exec timed out but gdb is running; continuing"
+            ARMED=1
+            break
+        fi
         echo "    arm attempt $a failed; retrying"
         sleep 8
     done
-- 
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