ESP8266 堆栈跟踪：在代码中找到 "last failed alloc call" 的位置
ESP8266 stack trace: find position of "last failed alloc call" in code
我正在尝试调试大型草图，偶尔会遇到与 Web 界面相关的崩溃，我正在尝试找出问题所在。
堆栈跟踪结束于：
last failed alloc call: 4022D552(1480)
这个特定地址不存在于解码堆栈跟踪本身中，但可能是找到问题根源的关键。关于如何追踪这个的任何建议？
Decoding 36 results
0x402222c5: BearSSL::WiFiClientSecure::_installClientX509Validator() at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr_base.h line 986
: (inlined by) ?? at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr.h line 316
: (inlined by) ?? at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr.h line 598
: (inlined by) ?? at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr.h line 614
: (inlined by) BearSSL::WiFiClientSecure::_installClientX509Validator() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 877
0x40222cfc: BearSSL::WiFiClientSecure::_connectSSL(char const*) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 962
0x40219c70: esp_yield at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/core_esp8266_main.cpp line 91
0x4021a8c3: delay at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/core_esp8266_wiring.cpp line 54
0x40206d6d: WiFiClient::connect(IPAddress, unsigned short) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/include/ClientContext.h line 136
: (inlined by) WiFiClient::connect(IPAddress, unsigned short) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClient.cpp line 170
0x40222eed: BearSSL::WiFiClientSecure::connect(char const*, unsigned short) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 231
0x40225230: BearSSL::PrivateKey::getEC() const at ?? line ?
0x40225230: BearSSL::PrivateKey::getEC() const at ?? line ?
0x40216b5c: HTTPClient::connect() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp line 1165
0x4021c16e: uart_write at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/uart.cpp line 498
0x40217820: HTTPClient::sendRequest(char const*, unsigned char*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp line 655
0x40217d98: HardwareSerial::write(unsigned char const*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 158
0x40273eba: sleep_reset_analog_rtcreg_8266 at ?? line ?
0x402180a5: Print::write(char const*) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.h line 60
0x40217d83: HardwareSerial::write(unsigned char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 154
0x402179ba: HTTPClient::GET() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp line 575
0x402118e8: HydroMonitorLogging::sendPostData(char*) at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 730
0x40225470: BearSSL::PrivateKey::getEC() const at ?? line ?
0x4022c4c0: _vsprintf_r at /home/earle/src/esp-quick-toolchain/repo/newlib/newlib/libc/stdio/vsprintf.c line 65
0x40217d98: HardwareSerial::write(unsigned char const*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 158
0x4022000a: spiffs_object_truncate at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/spiffs/spiffs_nucleus.cpp line 1727
0x40211d41: HydroMonitorLogging::transmitMessages() at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 337
0x40211caa: HydroMonitorLogging::transmitMessages() at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 326
0x40204dab: handleAPI() at /home/wouter/Arduino/Williams_fridge/Fridge_control/webAPI.ino line 149
0x402251c8: BearSSL::PrivateKey::getEC() const at ?? line ?
0x40217d98: HardwareSerial::write(unsigned char const*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 158
0x40218130: Print::println() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.cpp line 178
0x402121b5: HydroMonitorLogging::logData() at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 250
0x40217d83: HardwareSerial::write(unsigned char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 154
0x40224948: Print::write(char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.h line 73
0x40218114: Print::print(char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.cpp line 126
0x402106f4: HydroMonitorIsolatedSensorBoard::readSensor(bool) at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorIsolatedSensorBoard.cpp line 36
0x40207a07: TwoWire::requestFrom(int, int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/Wire/Wire.cpp line 134
0x402042f9: loop at /home/wouter/Arduino/Williams_fridge/Fridge_control/loop.ino line 36
0x40219d20: loop_wrapper() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/core_esp8266_main.cpp line 125
0x401015d5: cont_wrapper at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/cont.S line 81
注意：我也问过on the esp8266 forum, and opened an issue on github同样的问题。
ESP 间歇性崩溃最常见的原因是 运行RAM 不足。 "failed alloc call" 可能是指无法为操作分配内存（加密需要很好的位，队列中的每个打开的请求也是如此）。堆栈跟踪不会指向您代码中的特定位置，因为客户端库 运行 "in the background"（由中断或 once-per-loop 调用执行所有操作的函数触发）并且您的代码中没有特定事件固件引起的。在响应时间较长的 memory-starved ESP 上，从前端一次发送多个 AJAX 请求会导致过载。
要查看是否是这种情况，请尝试在循环中的不同点打印 ESP.getFreeHeap() 的结果。如果它远低于 10kb，则存在另一个请求将其推到极限的风险。
我测试了空闲堆并获得了大约 32 kB。所以没想到会出现任何内存问题。
事实证明，32 kB 小于 17 kB + 5 kB - 分别用于 clientSecure 和服务器。这就是导致崩溃的原因。放弃 SSL 加密完全解决了这个问题。开发团队提到它必须是连续内存——无论出于何种原因，我的 32 kB 显然不是。
简单的结论：您不能 运行 服务器（只是 http - 没有加密）并且在同一个程序中有一个安全的客户端。
没有 AJAX，顺便说一下。还没有达到那个水平。
我正在尝试调试大型草图，偶尔会遇到与 Web 界面相关的崩溃，我正在尝试找出问题所在。
堆栈跟踪结束于：
last failed alloc call: 4022D552(1480)
这个特定地址不存在于解码堆栈跟踪本身中，但可能是找到问题根源的关键。关于如何追踪这个的任何建议？
Decoding 36 results
0x402222c5: BearSSL::WiFiClientSecure::_installClientX509Validator() at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr_base.h line 986
: (inlined by) ?? at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr.h line 316
: (inlined by) ?? at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr.h line 598
: (inlined by) ?? at /home/wouter/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/xtensa-lx106-elf/include/c++/4.8.2/bits/shared_ptr.h line 614
: (inlined by) BearSSL::WiFiClientSecure::_installClientX509Validator() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 877
0x40222cfc: BearSSL::WiFiClientSecure::_connectSSL(char const*) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 962
0x40219c70: esp_yield at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/core_esp8266_main.cpp line 91
0x4021a8c3: delay at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/core_esp8266_wiring.cpp line 54
0x40206d6d: WiFiClient::connect(IPAddress, unsigned short) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/include/ClientContext.h line 136
: (inlined by) WiFiClient::connect(IPAddress, unsigned short) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClient.cpp line 170
0x40222eed: BearSSL::WiFiClientSecure::connect(char const*, unsigned short) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 231
0x40225230: BearSSL::PrivateKey::getEC() const at ?? line ?
0x40225230: BearSSL::PrivateKey::getEC() const at ?? line ?
0x40216b5c: HTTPClient::connect() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp line 1165
0x4021c16e: uart_write at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/uart.cpp line 498
0x40217820: HTTPClient::sendRequest(char const*, unsigned char*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp line 655
0x40217d98: HardwareSerial::write(unsigned char const*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 158
0x40273eba: sleep_reset_analog_rtcreg_8266 at ?? line ?
0x402180a5: Print::write(char const*) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.h line 60
0x40217d83: HardwareSerial::write(unsigned char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 154
0x402179ba: HTTPClient::GET() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp line 575
0x402118e8: HydroMonitorLogging::sendPostData(char*) at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 730
0x40225470: BearSSL::PrivateKey::getEC() const at ?? line ?
0x4022c4c0: _vsprintf_r at /home/earle/src/esp-quick-toolchain/repo/newlib/newlib/libc/stdio/vsprintf.c line 65
0x40217d98: HardwareSerial::write(unsigned char const*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 158
0x4022000a: spiffs_object_truncate at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/spiffs/spiffs_nucleus.cpp line 1727
0x40211d41: HydroMonitorLogging::transmitMessages() at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 337
0x40211caa: HydroMonitorLogging::transmitMessages() at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 326
0x40204dab: handleAPI() at /home/wouter/Arduino/Williams_fridge/Fridge_control/webAPI.ino line 149
0x402251c8: BearSSL::PrivateKey::getEC() const at ?? line ?
0x40217d98: HardwareSerial::write(unsigned char const*, unsigned int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 158
0x40218130: Print::println() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.cpp line 178
0x402121b5: HydroMonitorLogging::logData() at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorLogging.cpp line 250
0x40217d83: HardwareSerial::write(unsigned char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/HardwareSerial.h line 154
0x40224948: Print::write(char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.h line 73
0x40218114: Print::print(char) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/Print.cpp line 126
0x402106f4: HydroMonitorIsolatedSensorBoard::readSensor(bool) at /home/wouter/Arduino/libraries/HydroMonitor/src/HydroMonitorIsolatedSensorBoard.cpp line 36
0x40207a07: TwoWire::requestFrom(int, int) at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/libraries/Wire/Wire.cpp line 134
0x402042f9: loop at /home/wouter/Arduino/Williams_fridge/Fridge_control/loop.ino line 36
0x40219d20: loop_wrapper() at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/core_esp8266_main.cpp line 125
0x401015d5: cont_wrapper at /home/wouter/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/cores/esp8266/cont.S line 81
注意：我也问过on the esp8266 forum, and opened an issue on github同样的问题。
ESP 间歇性崩溃最常见的原因是 运行RAM 不足。 "failed alloc call" 可能是指无法为操作分配内存（加密需要很好的位，队列中的每个打开的请求也是如此）。堆栈跟踪不会指向您代码中的特定位置，因为客户端库 运行 "in the background"（由中断或 once-per-loop 调用执行所有操作的函数触发）并且您的代码中没有特定事件固件引起的。在响应时间较长的 memory-starved ESP 上，从前端一次发送多个 AJAX 请求会导致过载。
要查看是否是这种情况，请尝试在循环中的不同点打印 ESP.getFreeHeap() 的结果。如果它远低于 10kb，则存在另一个请求将其推到极限的风险。
我测试了空闲堆并获得了大约 32 kB。所以没想到会出现任何内存问题。
事实证明，32 kB 小于 17 kB + 5 kB - 分别用于 clientSecure 和服务器。这就是导致崩溃的原因。放弃 SSL 加密完全解决了这个问题。开发团队提到它必须是连续内存——无论出于何种原因，我的 32 kB 显然不是。
简单的结论：您不能 运行 服务器（只是 http - 没有加密）并且在同一个程序中有一个安全的客户端。
没有 AJAX，顺便说一下。还没有达到那个水平。