Teensy 4 Arduino 2.0.3 addr2line tutorial

C

carlsuttle

Member
I really struggled to find and get addr2line to work. Here is how I did that.

In the IDE set File/Preferences compile and upload tick boxes
prefs.PNG

Add an example line of code to your sketch from https://github.com/PaulStoffregen/MyFault/tree/main/examples
I used Data Access Violation and added the lines below to my code.

Code: 
void setup() {

if ( CrashReport ) {
    while (!Serial && millis() < 10000 );
    Serial.println("\n" __FILE__ " " __DATE__ " " __TIME__);
    Serial.print(CrashReport);
  }
.........

....somewhere in the main loop....
 if (outputlog == 4) {
    sprintf(buff, "Data access violation forced in 0.5 second");
    DEBUG_PRINTLN(buff);
    delay(500);
     CrashReport.breadcrumb( 1, 0x5000000 | __LINE__ ); // Upper bits hold '5' perhaps indicating func() for ref, lower bits show line #
    *(volatile uint32_t *)0x30000000 = 0; // causes Data_Access_Violation
}

Compile and upload the sketch. The IDE reports:

Code: 
Linking everything together...
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-compile\\5.4.1/arm/bin/arm-none-eabi-gcc" -O2 -Wl,--gc-sections,--relax "-TC:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\hardware\\avr\\1.57.2\\cores\\teensy4/imxrt1062.ld" -mthumb -mcpu=cortex-m7 -mfloat-abi=hard -mfpu=fpv5-d16 -o "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702\\sketch\\Yoke_Stick_v2.5_sno_ny.ino.cpp.o" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702\\libraries\\PWMServo\\PWMServo.cpp.o" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702\\libraries\\SimpleKalmanFilter\\SimpleKalmanFilter.cpp.o" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702\\libraries\\HX711\\HX711.cpp.o" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702\\libraries\\EEPROM\\EEPROM.cpp.o" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/..\\arduino-core-cache\\core_8c54a49357957ff2477bf8e4c39c2077.a" "-LC:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702" -larm_cortexM7lfsp_math -lm -lstdc++
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-compile\\5.4.1/arm/bin/arm-none-eabi-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.eep"
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-compile\\5.4.1/arm/bin/arm-none-eabi-objcopy" -O ihex -R .eeprom "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.hex"
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-tools\\1.57.2/teensy_secure" encrypthex TEENSY40 "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.hex"
No key .pem file found, skipping .ehex encryption
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-tools\\1.57.2/teensy_post_compile" -file=Yoke_Stick_v2.5_sno_ny.ino "-path=C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702" "-tools=C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-tools\\1.57.2/" -board=TEENSY40
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-tools\\1.57.2/stdout_redirect" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.sym" "C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-compile\\5.4.1/arm/bin/arm-none-eabi-objdump" -t -C "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf"
Memory Usage on Teensy 4.0:
  FLASH: code:38240, data:10216, headers:8884   free for files:1974276
   RAM1: variables:12512, code:34728, padding:30808   free for local variables:446240
   RAM2: variables:2176  free for malloc/new:522112
"C:\\Users\\carla\\AppData\\Local\\Arduino15\\packages\\teensy\\tools\\teensy-tools\\1.57.2/teensy_size" "C:\\Users\\carla\\AppData\\Local\\Temp\\arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf"

From which we note the path of the
  • Tools folder "C:\Users\carla\AppData\Local\Arduino15\packages\teensy\tools"
  • And .elf file "C:/Users/carla/AppData/Local/Temp/arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf"

Now force the error with the serial monitor open. After o.5 seconds the error was forced (presumably, and 8 seconds later the Teensy rebooted.
In the serial monitor after reboot I saw:

Code: 
09:56:38.282 -> C:\Users\carla\OneDrive - n-ats.com\Engineering\HID Project\Yoke_Stick_v2.5_sno_ny\Yoke_Stick_v2.5_sno_ny.ino Jan  5 2023 09:21:31
09:56:38.282 -> CrashReport:
09:56:38.282 ->   A problem occurred at (system time) 9:56:29
09:56:38.282 ->   Code was executing from address 0x93A
09:56:38.282 ->   CFSR: 82
09:56:38.282 -> 	(DACCVIOL) Data Access Violation
09:56:38.282 -> 	(MMARVALID) Accessed Address: 0x30000000
09:56:38.282 ->   Temperature inside the chip was 60.34 °C
09:56:38.282 ->   Startup CPU clock speed is 600MHz
09:56:38.282 ->   Reboot was caused by auto reboot after fault or bad interrupt detected
09:56:38.282 ->   Breadcrumb #1 was 83886572 (0x50001EC)

Now to find the sketch line number.

Make a note of the address from the crash report "0x93A"

Navigate to: the tools folder, Tools folder "C:\Users\carla\AppData\Local\Arduino15\packages\teensy\tools"
and navigate further to "C:\Users\carla\AppData\Local\Arduino15\packages\teensy\tools\teensy-compile\5.4.1\arm\bin" where you should find "arm-none-eabi-addr2line.exe"

I used notepad to construct the following text so I can paste it into the Command window, its a lot easier.
"arm-none-eabi-addr2line -e C:/Users/carla/AppData/Local/Temp/arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf 0x93A"

  1. Open a Command Prompt (Console) window.
  2. CD to "C:\Users\carla\AppData\Local\Arduino15\packages\teensy\tools\teensy-compile\5.4.1\arm\bin"
  3. Add the command (from notepad) "arm-none-eabi-addr2line -e C:/Users/carla/AppData/Local/Temp/arduino-sketch-8AF392A524185D95185266EB754B8702/Yoke_Stick_v2.5_sno_ny.ino.elf 0x93A"

Which returns in the Command Window:
"C:\Users\carla\OneDrive - n-ats.com\Engineering\HID Project\Yoke_Stick_v2.5_sno_ny/Yoke_Stick_v2.5_sno_ny.ino:493"

Looking up line 493 in the sketch gives us the line which caused the error:
"*(volatile uint32_t *)0x30000000 = 0; // causes Data_Access_Violation"

That's it, phew. Now maybe I can find out if my teensy crashes just where and when it did it.

P.S. Note I also added this line from the example:
Code: 
 CrashReport.breadcrumb( 1, 0x5000000 | __LINE__ ); // Upper bits hold '5' perhaps indicating func() for ref, lower bits show line #
And the crash report included "Breadcrumb #1 was 83886572 (0x50001EC)"
01EC is 492 decimal. The line of the sketch when the breadcrumb was written to.
That's useful::D
 
Last edited:
Hi

I'm trying to find a bug causing my teensy 4.1 to reboot. I've figured out to get a crashReport, but when I try to run addr2line I only get: ??:?

What am I doing wrong??

/Kim
 
Fint said:
Hi

I'm trying to find a bug causing my teensy 4.1 to reboot. I've figured out to get a crashReport, but when I try to run addr2line I only get: ??:?

What am I doing wrong??

/Kim
Click to expand...

Hard to say, maybe include more information, like contents of the Crashreport and the command line you used, plus output.

Some crashes are things like maybe stack got corrupted and returned to never never land, so it may fail to give you data.

As I mentioned in some other posts, when this fails, I will try to open up the .lst file that is created in the same directory as the .elf file.
And see if I can find that address. Note: some releases of Teensyduino the list file option was disabled. But currently is on with newer stuff
 
The Crashreport:
A problem occurred at (system time) 15:32:55
Code was executing from address 0x5CC0
CFSR: 82
(DACCVIOL) Data Access Violation
(MMARVALID) Accessed Address: 0x18 (nullptr)
Check code at 0x5CC0 - very likely a bug!
Run "addr2line -e mysketch.ino.elf 0x5CC0" for filename & line number.
Temperature inside the chip was 45.47 °C
Startup CPU clock speed is 600MHz
Reboot was caused by auto reboot after fault or bad interrupt detected

And my command:
arm-none-eabi-addr2line -e C:\Users\kim\AppData\Local\Temp\arduino\sketches\3D9DE058D0919DA7D0B213AB5E321529/endnu_en_SynthMeny_Array_Presets.ino.elf 0x5FAC

I tried searching in the .lst file, but 0x5FAC does not show up..
 
Last edited:
Fint said:
The Crashreport:
A problem occurred at (system time) 15:32:55
Code was executing from address 0x5CC0
CFSR: 82
(DACCVIOL) Data Access Violation
(MMARVALID) Accessed Address: 0x18 (nullptr)
Check code at 0x5CC0 - very likely a bug!
Run "addr2line -e mysketch.ino.elf 0x5CC0" for filename & line number.
Temperature inside the chip was 45.47 °C
Startup CPU clock speed is 600MHz
Reboot was caused by auto reboot after fault or bad interrupt detected

And my command:
arm-none-eabi-addr2line -e C:\Users\kim\AppData\Local\Temp\arduino\sketches\3D9DE058D0919DA7D0B213AB5E321529/endnu_en_SynthMeny_Array_Presets.ino.elf 0x5FAC

I tried searching in the .lst file, but 0x5FAC does not show up..
Click to expand...

You are showing looking for address 0x5FAC, but your crash report is showing address: 0x5CC0
 
Sorry - my bad, I pasted the wrong crashreport - this is the right report:

CrashReport:
A problem occurred at (system time) 8:1:30
Code was executing from address 0x5FAC
CFSR: 82
(DACCVIOL) Data Access Violation
(MMARVALID) Accessed Address: 0x18 (nullptr)
Check code at 0x5FAC - very likely a bug!
Run "addr2line -e mysketch.ino.elf 0x5FAC" for filename & line number.
Temperature inside the chip was 42.83 °C
 
Doesn't seem to be your case, because you are using Arduino IDE, but I had the same problem when using VSCode + PlatformIO and the solution was to include the compilation flag "-g" when compiling the sketch. Make sure Arduino IDE is including this.
Another thing to keep in mind is that you may need to search only "5FAC" instead of "0x5FAC" if you are using the .lst file approach.
 
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