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Showing content from https://github.com/esp8266/Arduino/issues/7307 below:

[Core 2.7.0/2.7.1] ESP.restart() or ESP.reset() cause bootloop · Issue #7307 · esp8266/Arduino · GitHub

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

• Hardware: ESP-12S
• Core Version: 2.7.0 and 2.7.1
• Development Env: Arduino IDE
• Operating System: Windows

• Module: Generic ESP8266 Module
• Flash Mode: dio
• Flash Size: 4MB
• lwip Variant: v2 Lower Memory
• Reset Method: [ck|nodemcu]
• Flash Frequency: 80Mhz
• CPU Frequency: 160MHz
• Upload Using: SERIAL
• Upload Speed: 921600

Core 2.7.0 and 2.7.1 ESP.restart() and ESP.reset() causes ESP to bootloop (ESP keep restarting, never start the program again). Unfortunately ESP didn't print any exception. In the debug message below, the program ran first time after Uploading. After first restart, ESP not printing serial and keep restarting forever at 1 sec interval. This is not happen in Core 2.6.3.

void setup() {
	delay(500);
	Serial.begin(115200);
	Serial.println("\nSTART");
	delay(5000);
	ESP.restart();
}

void loop() {
}

START

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3456, room 16 
tail 0
chksum 0x84
csum 0x84
va5432625
~ld

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 3456, room 16 
tail 0
chksum 0x84
csum 0x84
va5432625
~ld

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