ESP8266 crashes when trying to concat strings #6200
Description
Basic Infos
- 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.
Platform
- Hardware: ESP-12E
- Core Version: 2.5.2
- Development Env: Arduino IDE / Visual Studio
- Operating System: Windows
Settings in IDE
- Module: NodeMCU
- Flash Size: 4MB
- lwip Variant: v2 Higher Bandwidth
- Flash Frequency: 40Mhz
- CPU Frequency: 160MHz
- Upload Using: SERIAL
- Upload Speed: 115200
Problem Description
When I try to concat 2 strings, ESP crashes
Btw. This started crashing when 2.5.1 was released. When I was using 2.5.0 it didnt crash
MCVE Sketch
static const char CON[] PROGMEM = "<!DOCTYPE html><html><head><title>MY PAGE INDEX</title><style type='text/css'>* {-webkit-box-sizing: border-box;-moz-box-sizing: border-box;box-sizing: border-box;}.signpost {text-decoration: none;display: block;width:250px;height:50px;background-color: #663399;margin:25px auto;position: relative;color: white;text-align: center;vertical-align: middle;line-height: 50px;font-weight: bold;}.signpost:after {content:'';position: absolute;top:0;height:0; width:0; border-width: 25px;border-style:solid;border-color:#663399;border-top-color:transparent;border-bottom-color:transparent;}.signpost-right:after {border-right-color:transparent;left:100%;}.signpost-left:after {border-left-color:transparent;right: 100%;}a:link { text-decoration: none; color: inherit;}.restart {width: 50%;margin: auto;padding: 5px;text-align: center;border-radius: 20px;background-color: #6495ED;}</style></head><body><a href='ap'><div class='signpost signpost-right'>Access Point Setup</div></a><a href='wifi'><div class='signpost signpost-left'>Wi-Fi networks configuration</div></a><div class='restart'>Reason of restart: <span id='reason'>";
static const char CAT[] PROGMEM = "Web Server pin is set to LOW";
void setup() {
Serial.begin(115200);
String data = String(CON);
data += CAT;
Serial.println(data);
}
void loop() {
}Crash event
Exception (3):
epc1=0x4020580c epc2=0x00000000 epc3=0x00000000 excvaddr=0x402383c9 depc=0x00000000
>>>stack>>>
ctx: cont
sp: 3ffffdd0 end: 3fffffc0 offset: 01a0
3fffff70: 402383c9 0000001c 00000000 feefeffe
3fffff80: feefeffe 00000000 3ffee234 40201046
3fffff90: 00000000 00000000 ffefeffe feefeffe
3fffffa0: feefeffe feefeffe 3ffee25c 40201814
3fffffb0: feefeffe feefeffe 3ffe84f4 40100461
<<<stack<<<
ets Jan 8 2013,rst cause:2, boot mode:(3,6)
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v8b899c12
~ld
Decoded:
Decoding stack results
0x40201046: setup() at C:\Users\David\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266/WString.h line 121
0x40201d60: loop_wrapper() at C:\Users\David\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\core_esp8266_main.cpp line 122