test(coredump): collect all expected uart data first, then process lazily

Author: erhankur

tools/test_apps/system/panic/pytest_panic.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: CC0-1.0
 import re
 from typing import Any
@@ -120,14 +120,37 @@ def expect_coredump_flash_write_logs(dut: PanicTestDut, config: str) -> None:
         dut.expect_exact('Backing up stack @')
         dut.expect_exact('Restoring stack')
     dut.expect_exact('Core dump has been saved to flash.')
-    dut.expect('Rebooting...')
+    dut.expect(dut.REBOOT)
+
+
+def expect_coredump_uart_write_logs(dut: PanicTestDut, check_cpu_reset: Optional[bool] = True) -> Any:
+    # ================= CORE DUMP START =================
+    # B8AAAMAEgAGAAAAXAEAAAAAAABkAAAA
+    # ...
+    # ================= CORE DUMP END =================
+    # Coredump checksum='9730d7ff'
+    # Rebooting...
+    # ..
+    # rst:0xc (SW_CPU_RESET),boot:
+
+    # Read all uart logs until the end of the reset reason
+    uart_str = dut.expect(',boot:', return_what_before_match=True).decode('utf-8', errors='ignore')
+    coredump_base64 = uart_str.split(dut.COREDUMP_UART_START)[1].split(dut.COREDUMP_UART_END)[0].strip()
+    uart_str = uart_str.split(dut.COREDUMP_UART_END)[1]
+    assert re.search(dut.COREDUMP_CHECKSUM, uart_str)
+    assert re.search(dut.REBOOT, uart_str)
+    if check_cpu_reset:
+        assert re.search(dut.CPU_RESET, uart_str)
+    return coredump_base64
 
 
 def common_test(dut: PanicTestDut, config: str, expected_backtrace: Optional[List[str]] = None, check_cpu_reset: Optional[bool] = True,
                 expected_coredump: Optional[Sequence[Union[str, Pattern[Any]]]] = None) -> None:
     if 'gdbstub' in config:
         if 'coredump' in config:
-            dut.process_coredump_uart(expected_coredump, False)
+            uart_str = dut.expect(dut.COREDUMP_CHECKSUM, return_what_before_match=True).decode('utf-8')
+            coredump_base64 = uart_str.split(dut.COREDUMP_UART_START)[1].split(dut.COREDUMP_UART_END)[0].strip()
+            dut.process_coredump_uart(coredump_base64, expected_coredump)
         dut.expect_exact('Entering gdb stub now.')
         dut.start_gdb_for_gdbstub()
         frames = dut.gdb_backtrace()
@@ -141,12 +164,14 @@ def common_test(dut: PanicTestDut, config: str, expected_backtrace: Optional[Lis
         expected_coredump = None
 
     if 'uart' in config:
-        dut.process_coredump_uart(expected_coredump)
+        coredump_base64 = expect_coredump_uart_write_logs(dut, check_cpu_reset)
+        dut.process_coredump_uart(coredump_base64, expected_coredump)
+        check_cpu_reset = False  # CPU reset is already checked in expect_coredump_uart_write_logs
     elif 'flash' in config:
         expect_coredump_flash_write_logs(dut, config)
         dut.process_coredump_flash(expected_coredump)
     elif 'panic' in config:
-        dut.expect('Rebooting...', timeout=60)
+        dut.expect(dut.REBOOT, timeout=60)
 
     if check_cpu_reset:
         dut.expect_cpu_reset()

tools/test_apps/system/panic/test_panic_util/panic_dut.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Unlicense OR CC0-1.0
 import logging
 import os
@@ -28,8 +28,11 @@ class PanicTestDut(IdfDut):
     BOOT_CMD_ADDR = 0x9000
     BOOT_CMD_SIZE = 0x1000
     DEFAULT_EXPECT_TIMEOUT = 10
-    COREDUMP_UART_START = '================= CORE DUMP START ================='
-    COREDUMP_UART_END = '================= CORE DUMP END ================='
+    COREDUMP_UART_START = r'================= CORE DUMP START ================='
+    COREDUMP_UART_END = r'================= CORE DUMP END ================='
+    COREDUMP_CHECKSUM = r"Coredump checksum='([a-fA-F0-9]+)'"
+    REBOOT = r'.*Rebooting\.\.\.'
+    CPU_RESET = r'.*rst:.*(RTC_SW_CPU_RST|SW_CPU_RESET|SW_CPU)\b'
 
     app: IdfApp
     serial: IdfSerial
@@ -106,7 +109,7 @@ def expect_reg_dump(self, core: Optional[int] = None) -> None:
 
     def expect_cpu_reset(self) -> None:
         # no digital system reset for panic handling restarts (see IDF-7255)
-        self.expect(r'.*rst:.*(RTC_SW_CPU_RST|SW_CPU_RESET|SW_CPU)')
+        self.expect(self.CPU_RESET)
 
     def expect_elf_sha256(self, caption: str = 'ELF file SHA256: ') -> None:
         """Expect method for ELF SHA256 line"""
@@ -162,15 +165,8 @@ def _call_espcoredump(
             self.coredump_output.seek(0)
 
     def process_coredump_uart(
-        self, expected: Optional[List[Union[str, re.Pattern]]] = None, wait_reboot: bool = True
+        self, coredump_base64: Any, expected: Optional[List[Union[str, re.Pattern]]] = None,
     ) -> None:
-        """Extract the core dump from UART output of the test, run espcoredump on it"""
-        self.expect(self.COREDUMP_UART_START)
-        uart_data = self.expect('(.+)' + self.COREDUMP_UART_END)
-        self.expect(re.compile(r"Coredump checksum='([a-fA-F0-9]+)'"))
-        if wait_reboot:
-            self.expect('Rebooting...')
-        coredump_base64 = uart_data.group(1).decode('utf8')
         with open(os.path.join(self.logdir, 'coredump_data.b64'), 'w') as coredump_file:
             logging.info('Writing UART base64 core dump to %s', coredump_file.name)
             coredump_file.write(coredump_base64)