ci: remove ESP32 from QEMU smoke tests, add stack trace analysis

- Remove ESP32 original from smoke tests (QEMU doesn't emulate PHY correctly)
- Add automatic addr2line stack trace decoding on crash
- Remove examples/uart/espectre-esp32.yaml (not testable in QEMU)
- Update documentation with ESP32 exclusion note

Author: francescopace

.github/actions/qemu-smoke-test/action.yml

@@ -78,6 +78,39 @@ runs:
           echo ""
           echo "SMOKE TEST FAILED - CRASH DETECTED!"
           grep -iE "panic|abort|Guru Meditation|assert failed|stack smashing" qemu_output.log
+          
+          # Decode stack trace if backtrace is present
+          BACKTRACE=$(grep -oE "Backtrace: [0-9a-fx: ]+" qemu_output.log | head -1 | sed 's/Backtrace: //')
+          if [ -n "$BACKTRACE" ]; then
+            echo ""
+            echo "=== Stack Trace Analysis ==="
+            FIRMWARE_ELF=$(find examples -name "firmware.elf" -type f | head -1)
+            if [ -n "$FIRMWARE_ELF" ]; then
+              # Extract addresses and decode with addr2line
+              ADDRS=$(echo "$BACKTRACE" | grep -oE "0x[0-9a-f]+" | tr '\n' ' ')
+              
+              # Select addr2line based on architecture
+              if [ "${{ inputs.arch }}" = "xtensa" ]; then
+                ADDR2LINE=$(find ~/.platformio/tools -name "xtensa-*-elf-addr2line" 2>/dev/null | head -1)
+              else
+                ADDR2LINE=$(find ~/.platformio/tools -name "riscv32-*-elf-addr2line" 2>/dev/null | head -1)
+              fi
+              
+              if [ -n "$ADDR2LINE" ]; then
+                echo "Using: $ADDR2LINE"
+                echo "ELF: $FIRMWARE_ELF"
+                echo ""
+                $ADDR2LINE -pfiaC -e "$FIRMWARE_ELF" $ADDRS
+              else
+                echo "addr2line not found, showing raw addresses:"
+                echo "$BACKTRACE"
+              fi
+            else
+              echo "ELF file not found, showing raw backtrace:"
+              echo "$BACKTRACE"
+            fi
+          fi
+          
           exit 1
         fi
         

.github/workflows/ci.yml

@@ -150,12 +150,8 @@ jobs:
             config: examples/espectre-c5.yaml
           - chip: ESP32-C6
             config: examples/espectre-c6.yaml
-          # QEMU boot tests (examples/uart/)
-          - chip: ESP32
-            config: examples/uart/espectre-esp32.yaml
-            qemu_chip: esp32
-            qemu_arch: xtensa
-            qemu_machine: esp32
+          # QEMU smoke tests (examples/uart/)
+          # Note: ESP32 original excluded - QEMU doesn't emulate PHY registers correctly
           - chip: ESP32-S3
             config: examples/uart/espectre-s3.yaml
             qemu_chip: esp32s3

CHANGELOG.md

@@ -24,12 +24,15 @@ Useful for recalibrating after room layout changes (furniture, sensor position)
 
 Added automated smoke tests using QEMU emulation to catch firmware crashes early.
 
-- **Supported chips**: ESP32, ESP32-S3, ESP32-C3, ESP32-C6
+- **Supported chips**: ESP32-S3, ESP32-C3, ESP32-C6
 - **Detection**: Kernel panics, Guru Meditation errors, assertion failures, stack smashing
-- **Architecture coverage**: Both Xtensa (ESP32, S3) and RISC-V (C3, C6)
+- **Stack trace analysis**: Automatic `addr2line` decoding on crash for easier debugging
+- **Architecture coverage**: Both Xtensa (S3) and RISC-V (C3, C6)
 
 New UART configurations in `examples/uart/` for boards with USB-UART bridges (CH340, CP2102, CH343) and QEMU smoke tests.
 
+> Note: ESP32 original is excluded from QEMU testing as the emulator doesn't correctly emulate PHY/radio registers, causing false positive crashes.
+
 ---
 
 ## [2.3.0] - 2025-12-31 

examples/.gitignore

@@ -111,11 +111,12 @@ act -j build --matrix chip:"QEMU ESP32-C3" -P ubuntu-latest=catthehacker/ubuntu:
 
 | Chip | Architecture | QEMU Machine |
 |------|--------------|--------------|
-| ESP32 | Xtensa | esp32 |
 | ESP32-S3 | Xtensa | esp32s3 |
 | ESP32-C3 | RISC-V | esp32c3 |
 | ESP32-C6 | RISC-V | esp32c6 |
 
+> Note: ESP32 original is excluded - QEMU doesn't emulate PHY registers correctly, causing false crashes.
+
 > **Note**: Smoke tests appear as "Smoke Test ESP32-C3" etc. in CI.
 
 ---