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Hi,
It seems since last idf sync (d27d297) there is a memory issue
before this commit you can have in a function : a static String variable
like static String s; without issue
after this commit if a call is done to the function having a static String then esp crash
My test code is SPIFFS_test.ino where I just added the static variable declaration, even not used it
void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
static String s;
Serial.printf("Listing directory: %s\n", dirname);
...
Here the exception:
the first line is the ESP.getFreeHeap() to check memory
199016
Guru Meditation Error of type InstrFetchProhibited occurred on core 1. Exception was unhandled.
Register dump:
PC : 0x00000000 PS : 0x00060730 A0 : 0x800d355a A1 : 0x3ffcf190
A2 : 0x3ffc2750 A3 : 0x3f401229 A4 : 0x00000000 A5 : 0x0000ff00
A6 : 0x00ff0000 A7 : 0xff000000 A8 : 0x800d345a A9 : 0x3ffcf170
A10 : 0x3ffc2750 A11 : 0x00000001 A12 : 0x3ffc9f7c A13 : 0x0000ff00
A14 : 0x00ff0000 A15 : 0xff000000 SAR : 0x00000010 EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xffffffff
Backtrace: 0x00000000:0x3ffcf190 0x400d3557:0x3ffcf1b0 0x400d0d54:0x3ffcf1e0 0x400d103b:0x3ffcf250 0x400e471f:0x3ffcf280
may be it is linked to : espressif/esp-idf#1072 (comment)
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