ESP8266 Stack error - Panic umm_malloc

[rchandrashekar]

Hi,

I am getting the below stack exception in some scenarios when i load a html page - it would be great if somehow has encountered similar error in the past

Panic umm_malloc.cpp:229 umm_get_ptr_context

>>>stack>>>

ctx: cont
sp: 3ffffc60 end: 3fffffc0 offset: 0000
3ffffc60:  4010271d 3fff2c94 3ffffd10 00000007  
3ffffc70:  000000fe 00000000 00000000 00000000  
3ffffc80:  00000000 00000000 00000000 3fff00a4  
3ffffc90:  3fff0838 00000006 3ffffddc 3ffefc70  
3ffffca0:  3ffefc58 00000020 ffffffff 4021e5be  
3ffffcb0:  3ffffcd0 00000001 3ffffddc 4021e62b  
3ffffcc0:  3ffefc58 00000020 3fff1644 40100c74  
3ffffcd0:  3ffefc58 3ffefc40 3ffefc40 40100d75  
3ffffce0:  3ffefc58 3ffefc4c 3ffffd20 4021c7c1  
3ffffcf0:  3ffe9aef 3ffefc4c 3ffffd10 402016d9  
3ffffd00:  3ffefc58 3ffefc4c 3ffe9aef 40205916  
3ffffd10:  008e0000 ffffffff ffffffff ffffffff  
3ffffd20:  ffffffff ffffffff ffffffff ffffffff  
3ffffd30:  bf58ffff 83c44725 ffff0281 002716f8  
3ffffd40:  00000000 00000000 00000000 00000000  
3ffffd50:  008e0000 ffffffff ffffffff ffffffff  
3ffffd60:  ffffffff ffffffff ffffffff ffffffff  
3ffffd70:  bf58ffff 83c44725 ffff0281 002716f8  
3ffffd80:  00000000 00000000 00000000 00000000  
3ffffd90:  008e0000 ffffffff ffffffff ffffffff  
3ffffda0:  ffffffff ffffffff ffffffff ffffffff  
3ffffdb0:  bf58ffff 83c44725 ffff0281 002716f8  
3ffffdc0:  00000000 00000000 00000000 00000000  
3ffffdd0:  00000000 0023002f 00000000 00000000  
3ffffde0:  0023002f 00000000 00000000 001c001f  
3ffffdf0:  00000000 00000000 001b001f 00000000  
3ffffe00:  00000000 001a001f 00000000 00000000  
3ffffe10:  0019001f 00000000 00000000 0015001f  
3ffffe20:  00000000 00000000 0014001f 00000000  
3ffffe30:  00000000 0010001f 00000000 00000000  
3ffffe40:  000f000f 00000000 00000000 000c000f  
3ffffe50:  00000000 00000000 000b000f 00000000  
3ffffe60:  00000000 00000000 00000000 00000000  
3ffffe70:  3ffef83c 00000000 00000000 402091c0  
3ffffe80:  00000000 00000000 00000000 00000000  
3ffffe90:  00000000 00000000 00000000 00000000  
3ffffea0:  3ffefc94 3ffefc88 3ffefc7c 4021d154  
3ffffeb0:  00000000 4bc6a7f0 55810624 3fff0058  
3ffffec0:  3fffdad0 00000001 3fff1cc4 40223932  
3ffffed0:  00000708 00000000 00000000 401000e9  
3ffffee0:  00000000 00000000 3fff2c94 40204e01  
3ffffef0:  00000000 3ffef860 3ffef818 402099ac  
3fffff00:  00000000 00000000 00000000 69746365  
3fffff10:  00000000 3ffefdf8 40100629 00000000  
3fffff20:  0002d218 00000000 00000000 00000001  
3fffff30:  00000000 00000000 3ffef818 3fff0058  
3fffff40:  3fffdad0 3ffef83c 3ffef818 4020a57e  
3fffff50:  40224da8 00000000 00001388 4021ab00  
3fffff60:  00000000 00000000 3fff331c 00000000  
3fffff70:  3fffdad0 00000000 3fff0044 4020a669  
3fffff80:  00000000 00000000 00000001 401003ec  
3fffff90:  3fffdad0 00000000 3fff0044 4010040d  
3fffffa0:  3fffdad0 00000000 3fff0044 4021de50  
3fffffb0:  feefeffe feefeffe 3ffe8664 4010103d  
<<<stack<<<

stack results0x40100c74: umm_get_ptr_context(void*) at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 2250x40100d75: free(void*) at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 5930x4021c14d: String::invalidate() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 2950x402016d9: effector::~effector() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 790x402052a2: updateConfigPage() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 790x40208b4c: esp8266webserver::ESP8266WebServerTemplate::_parseRequest(WiFiClient&) at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 790x4021cae0: String::equals(String const&) const at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 4920x402232be: std::_Function_handler::_M_invoke(std::_Any_data const&) at c:\users\rahul.chandrashekar\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.0.4-gcc10.3-1757bed\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h line 2890x401000e9: std::function::operator()() const at c:\users\rahul.chandrashekar\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.0.4-gcc10.3-1757bed\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h line 6170x4020478d: esp8266webserver::FunctionRequestHandler::handle(esp8266webserver::ESP8266WebServerTemplate&, HTTPMethod, String const&) at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WebServer\src/detail/RequestHandlersImpl.h line 420x40209338: esp8266webserver::ESP8266WebServerTemplate::_handleRequest() at c:\users\rahul.chandrashekar\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.0.4-gcc10.3-1757bed\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h line 4980x40100629: millis() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_wiring.cpp line 1930x40209f0a: esp8266webserver::ESP8266WebServerTemplate::handleClient() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WebServer\src/ESP8266WebServer-impl.h line 2740x4021a48c: HardwareSerial::available() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\HardwareSerial.cpp line 1110x40209ff5: loop() at C:\Users\rahul.chandrashekar\OneDrive - Gentherm\Documents\Arduino\test_0/test_0.ino line 3590x401003ec: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 1810x4010040d: esp_schedule() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 1280x4021d7dc: loop_wrapper() at C:\Users\rahul.chandrashekar\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 201

[UKHeliBob]

Your topic was MOVED to its current forum category which is more appropriate than the original as it has nothing to do with Installation and Troubleshooting of the IDE

[johnwasser]

@rchandrashekar

`stack results

0x40100c74: umm_get_ptr_context(void*) at
\cores\esp8266\umm_malloc\umm_malloc.cpp line 225

100d75: free(void*) at
cores\esp8266\umm_malloc\umm_malloc.cpp line 593

0x4021c14d: String::invalidate() at
cores\esp8266/WString.h line 295

0x402016d9: effector::~effector() at
\cores\esp8266/WString.h line 79

0x402052a2: updateConfigPage() at
\cores\esp8266/WString.h line 79

0x40208b4c: esp8266webserver::ESP8266WebServerTemplate::_parseRequest(WiFiClient&) at
\cores\esp8266/WString.h line 79

0x4021cae0: String::equals(String const&)

Weird. It looks like things go wrong when an "effector" object is destructed (effector::~effector). That tries to destruct a String object and the crash happens when the String object tries to free it's allocated memory.

[rchandrashekar]

@johnwasser

Weird. It looks like things go wrong when an "effector" object is destructed (effector::~effector). That tries to destruct a String object and the crash happens when the String object tries to free it's allocated memory.

Hi John,

I do not undertand your comment. Pls find the potential place where this error is occuring:

effector eff1;
 EEPROMRead(l1, reinterpret_cast<char*>(&eff1), sizeof(eff1));
    if(!eff1.effectorName.equals("")){
      effector_1_name = eff1.effectorName;
      effectorNameMap->put(eff1.effectorName, "1");
      effectorNameTypeMap->put(eff1.effectorName, eff1.type);
    } 

effectorName is a SimpleMap

[Idahowalker]

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the </> icon above the compose window) to make it easier to read and copy for examination

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A ESP8266 EEPROM is not very large. The code may be going over the EEPROM's size limits.

Good luck.

[johnwasser]

My guess is that your class "effector" or the SimpleMap class on which it is based contains a String object. When you store a String object (possibly effector::effectorName) in EEPROM you are NOT storing the string data which is in allocated memory. You store the pointer to the allocated memory. When you read that pointer back from EEPROM ( EEPROMRead(l1, reinterpret_cast<char*>(&eff1), sizeof(eff1));) it is no longer valid (the allocated memory it once pointed to is no longer allocated). When the String library tries to free the old data at the invalid pointer: PANIC!

If you want to store your object in EEPROM, make the character data part of the object as a fixed size character array.

[rchandrashekar]

Thanks John.
I found the solution. The issue was there were some old values (probably of String) format and it was more of a class cast exception.

Thanks for your comments

[rchandrashekar]

Hi John,

do you have any comments for .js file within index.h - Using Arduino / Programming Questions - Arduino Forum

Regds
Rahul.

[johnwasser]

@rchandrashekar

do you have any comments for ".js file within index.h"

Nope. Not a clue. Can you even run Javacript on a ESP8266?!?

[rchandrashekar]

Hi John,

yes - i was able to make this happen. I have posted the code on the channel. It is more of server.send request.