Hard fault while sending huge data through ethernet

[utkarshchaurasiya36]

"We are facing a hard fault issue in our code when sending a large amount of data. Occasionally, it runs properly, but most of the time, it goes into a hard fault after sending approximately 10,000 bytes. The image data we are sending is around 40 KB. Interestingly, sending 'Hello World' in a loop works successfully without any faults. I have also tried increasing the lwIP options sizes through a trial-and-error approach, but the issue persists. I have been struggling with this problem for the past 20 days and have not been able to resolve it. I am using the STM32H723VGT6 microcontroller. Please help me resolve this issue."

[Andrew Neil]

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@utkarshchaurasiya36 wrote:

I have been struggling with this problem for the past 20 days and have not been able to resolve it.

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So what have you tried in those 20 days?

What have you discovered?

Debugging Hard Faults:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/tac-p/708193/highlight/true#M51

LwIP Debugging:

https://community.st.com/t5/stm32-mcus/using-the-itm-console-for-printf-redirects-and-lwip-debug/ta-p/723472

PS:

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@utkarshchaurasiya36 wrote:

Occasionally, it runs properly, but most of the time, it goes into a hard fault after sending approximately 10,000 bytes.."

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If it does work occasionally, that could suggest a timing issue somewhere...
 

Some general debugging tips:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/tac-p/706966/highlight/true#M49

[utkarshchaurasiya36]

Duplicate - merged. Please don't create new threads on the same topic.

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"We are facing a hard fault issue in our code when sending a large amount of data. Occasionally, it runs properly most of the time, but sometimes it goes into a hard fault /mem handler fault after sending approximately a few bytes. The image data we are sending is around 10 KB. Interestingly, sending 'Hello World' in a loop works successfully without any faults. I have also tried increasing the lwIP option sizes through a trial-and-error approach, but the issue persists. I have been struggling with this problem for the past 5 days and cannot resolve it. I am using the STM32H723VGT6 microcontroller. Please help me resolve this issue."

[utkarshchaurasiya36]

HARD FAULT STACK-
"cam_bsnet Debug [STM32 C/C++ Application]

cam_bsnet.elf [cores: 0]

Thread #1 [main] 1 [core: 0] (Suspended : Signal : SIGTRAP:Trace/breakpoint trap)

HardFault_Handler() at stm32h7xx_it.c:113 0x8002070

<signal handler called>() at 0xfffffffd

ethernet_input() at ethernet.c:113 0x8023328

tcpip_thread_handle_msg() at tcpip.c:174 0x801714e

tcpip_thread() at tcpip.c:148 0x8017102

pxPortInitialiseStack() at port.c:214 0x8012ab0

arm-none-eabi-gdb (13.2.90.20230627)

ST-LINK (ST-LINK GDB server)"

[Andrew Neil]

So look into the code at that point to see what's going on.

[STea]

Hello @utkarshchaurasiya36 ,

it seems like you run out of memory at some point or a pointer to a stack is corrupted.

I recommend you follow How to debug a HardFault on an Arm Cortex®-M STM32 - STMicroelectronics Community to determine what is the root cause of the hardfault.
Regards

[LCE]

I have put the lwIP heap and pbuf pool into AXI SRAM / D1, maybe try that.

You won't run out of memory that quick - but I have actually no idea how the OS or you are handling the lwIP pool memory...