I was frequently seeing the following and a reboot:
Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x4008ae2d PS : 0x00060330 A0 : 0x800d3fd9 A1 : 0x3ffe15f0
A2 : 0x3ffc40e8 A3 : 0x00000000 A4 : 0x000000ff A5 : 0x0000ff00
A6 : 0x00ff0000 A7 : 0xff000000 A8 : 0x00000000 A9 : 0x3ffe15c0
A10 : 0x3ffc40e8 A11 : 0x3f40035d A12 : 0x3ffe16a0 A13 : 0x000004b0
A14 : 0x7ff00000 A15 : 0x7ff2c000 SAR : 0x0000001d EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x4008ae2d LEND : 0x4008ae41 LCOUNT : 0xffffffff
Backtrace: 0x4008ae2a:0x3ffe15f0 0x400d3fd6:0x3ffe1600 0x400d42d3:0x3ffe18f0
decoded:
0x4008acbc: strcmp at /builds/idf/crosstool-NG/.build/xtensa-esp32-elf/src/newlib/newlib/libc/machine/xtensa/strcmp.S:467
0x400d4145: fetch_printer_data() at /home/user/tmp/CYD-Klipper/CYD-Klipper/src/core/data_setup.cpp:180
0x400d42d3: data_loop_background(void*) at /home/user/tmp/CYD-Klipper/CYD-Klipper/src/core/data_setup.cpp:233 (discriminator 1)
Seems like the printer state was frequently ending up as null, so check
for that and return a reasonable response. After applying this patch,
things are stable for me.
