The stack trace ends with:
last failed alloc call: 4022D552(1480)
This particular address is not present in the decode stack trace itself, but may hold the key to finding the source of the problem. Any suggestions on how to track this one down?
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
Note: also asked on StackOverflow and opened issue about the same on github.