[ESP32-C5]Interrupt wdt timeout when called esp_restart() (IDFGH-16688)

[404-code]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

v5.5.1-1-g129cd0d247

Espressif SoC revision.

Chip is ESP32-C5 (revision v1.0)

Operating System used.

Linux

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

None

Development Kit.

ESP32-C5-DevKitC-1

Power Supply used.

USB

What is the expected behavior?

When I restart system by software, the uart should be initialized successfully.

What is the actual behavior?

When I restart, the log showed:

Guru Meditation Error: Core 0 panic'ed (Interrupt wdt timeout on CPU0)

Steps to reproduce.

1. I used the demo: examples/peripherals/uart/uart_echo
2. add following code after line 72:

if (len) {
    data[len] = '\0';
    ESP_LOGI(TAG, "Recv str: %s", (char *) data);
    printf("==============Ready to restart=======\r\n");
    // uart_driver_delete(ECHO_UART_PORT_NUM);
    vTaskDelay(1000/portTICK_PERIOD_MS);
    esp_restart();
}

3. input words by uart to trigger esp_restart();

Debug Logs.

ESP-ROM:esp32c5-eco2-20250121
Build:Jan 21 2025
rst:0x1 (POWERON),boot:0x1e (SPI_FAST_FLASH_BOOT)
SPI mode:DIO, clock div:1
load:0x408556b0,len:0x1710
load:0x4084bba0,len:0xd9c
load:0x4084e5a0,len:0x3198
entry 0x4084bbaa
I (23) boot: ESP-IDF v5.5.1-1-g129cd0d247 2nd stage bootloader
I (23) boot: compile time Oct 27 2025 15:46:26
I (24) boot: chip revision: v1.0
I (25) boot: efuse block revision: v0.2
I (28) boot.esp32c5: SPI Speed      : 80MHz
I (32) boot.esp32c5: SPI Mode       : DIO
I (36) boot.esp32c5: SPI Flash Size : 2MB
I (40) boot: Enabling RNG early entropy source...
I (44) boot: Partition Table:
I (47) boot: ## Label            Usage          Type ST Offset   Length
I (53) boot:  0 nvs              WiFi data        01 02 00009000 00006000
I (59) boot:  1 phy_init         RF data          01 01 0000f000 00001000
I (66) boot:  2 factory          factory app      00 00 00010000 00100000
I (73) boot: End of partition table
I (76) esp_image: segment 0: paddr=00010020 vaddr=42020020 size=08580h ( 34176) map
I (90) esp_image: segment 1: paddr=000185a8 vaddr=40800000 size=07a70h ( 31344) load
I (97) esp_image: segment 2: paddr=00020020 vaddr=42000020 size=17488h ( 95368) map
I (115) esp_image: segment 3: paddr=000374b0 vaddr=40807a70 size=04e7ch ( 20092) load
I (119) esp_image: segment 4: paddr=0003c334 vaddr=4080c900 size=018f8h (  6392) load
I (124) boot: Loaded app from partition at offset 0x10000
I (124) boot: Disabling RNG early entropy source...
I (140) MSPI Timing: tuning success, best point is index 4
I (141) MSPI Timing: Flash timing tuning index: 4
I (141) cpu_start: Unicore app
I (165) cpu_start: Pro cpu start user code
I (165) cpu_start: cpu freq: 240000000 Hz
I (165) app_init: Application information:
I (165) app_init: Project name:     uart_echo
I (169) app_init: App version:      v5.5.1-1-g129cd0d247
I (174) app_init: Compile time:     Oct 27 2025 15:46:03
I (179) app_init: ELF file SHA256:  037961166...
I (184) app_init: ESP-IDF:          v5.5.1-1-g129cd0d247
I (189) efuse_init: Min chip rev:     v1.0
I (193) efuse_init: Max chip rev:     v1.99 
I (197) efuse_init: Chip rev:         v1.0
I (200) heap_init: Initializing. RAM available for dynamic allocation:
I (207) heap_init: At 4080F140 len 0004D460 (309 KiB): RAM
I (212) heap_init: At 4085C5A0 len 00002F58 (11 KiB): RAM
I (217) heap_init: At 50000000 len 00003FE8 (15 KiB): RTCRAM
I (223) spi_flash: detected chip: generic
I (226) spi_flash: flash io: dio
W (229) spi_flash: Detected size(8192k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (241) sleep_gpio: Configure to isolate all GPIO pins in sleep state
I (247) sleep_gpio: Enable automatic switching of GPIO sleep configuration
I (254) main_task: Started on CPU0
I (254) main_task: Calling app_main()
I (284) main_task: Returned from app_main()
I (27444) UART TEST: Recv str: hello world 
==============Ready to restart=======
ESP-ROM:esp32c5-eco2-20250121
Build:Jan 21 2025
rst:0xc (SW_CPU),boot:0x1e (SPI_FAST_FLASH_BOOT)
Core0 Saved PC:0x40806136
SPI mode:DIO, clock div:1
load:0x408556b0,len:0x1710
load:0x4084bba0,len:0xd9c
load:0x4084e5a0,len:0x3198
entry 0x4084bbaa
I (27) boot: ESP-IDF v5.5.1-1-g129cd0d247 2nd stage bootloader
I (28) boot: compile time Oct 27 2025 15:46:26
I (29) boot: chip revision: v1.0
I (29) boot: efuse block revision: v0.2
I (32) boot.esp32c5: SPI Speed      : 80MHz
I (36) boot.esp32c5: SPI Mode       : DIO
I (40) boot.esp32c5: SPI Flash Size : 2MB
I (44) boot: Enabling RNG early entropy source...
I (48) boot: Partition Table:
I (51) boot: ## Label            Usage          Type ST Offset   Length
I (57) boot:  0 nvs              WiFi data        01 02 00009000 00006000
I (64) boot:  1 phy_init         RF data          01 01 0000f000 00001000
I (70) boot:  2 factory          factory app      00 00 00010000 00100000
I (77) boot: End of partition table
I (80) esp_image: segment 0: paddr=00010020 vaddr=42020020 size=08580h ( 34176) map
I (95) esp_image: segment 1: paddr=000185a8 vaddr=40800000 size=07a70h ( 31344) load
I (105) esp_image: segment 2: paddr=00020020 vaddr=42000020 size=17488h ( 95368) map
I (125) esp_image: segment 3: paddr=000374b0 vaddr=40807a70 size=04e7ch ( 20092) load
I (132) esp_image: segment 4: paddr=0003c334 vaddr=4080c900 size=018f8h (  6392) load
I (139) boot: Loaded app from partition at offset 0x10000
I (139) boot: Disabling RNG early entropy source...
I (151) MSPI Timing: tuning success, best point is index 4
I (152) MSPI Timing: Flash timing tuning index: 4
I (152) cpu_start: Unicore app
I (164) cpu_start: Pro cpu start user code
I (164) cpu_start: cpu freq: 240000000 Hz
I (164) app_init: Application information:
I (164) app_init: Project name:     uart_echo
I (168) app_init: App version:      v5.5.1-1-g129cd0d247
I (173) app_init: Compile time:     Oct 27 2025 15:46:03
I (178) app_init: ELF file SHA256:  037961166...
I (183) app_init: ESP-IDF:          v5.5.1-1-g129cd0d247
I (188) efuse_init: Min chip rev:     v1.0
I (191) efuse_init: Max chip rev:     v1.99 
I (195) efuse_init: Chip rev:         v1.0
I (199) heap_init: Initializing. RAM available for dynamic allocation:
I (206) heap_init: At 4080F140 len 0004D460 (309 KiB): RAM
I (211) heap_init: At 4085C5A0 len 00002F58 (11 KiB): RAM
I (216) heap_init: At 50000000 len 00003FE8 (15 KiB): RTCRAM
I (222) spi_flash: detected chip: generic
I (225) spi_flash: flash io: dio
W (228) spi_flash: Detected size(8192k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (240) sleep_gpio: Configure to isolate all GPIO pins in sleep state
I (246) sleep_gpio: Enable automatic switching of GPIO sleep configuration
I (253) main_task: Started on CPU0
I (253) main_task: Calling app_main()

Guru Meditation Error: Core  0 panic'ed (Interrupt wdt timeout on CPU0). 
Core  0 register dump:
MEPC    : 0x4200c728  RA      : 0x4200c6e8  SP      : 0x4085d2d0  GP      : 0x4080d104  
TP      : 0x4085d380  T0      : 0x40025d88  T1      : 0x00000000  T2      : 0x00000000  
S0/FP   : 0x0000000a  S1      : 0x4080ca50  A0      : 0x00000064  A1      : 0x0000000a  
A2      : 0xfffff003  A3      : 0x00000000  A4      : 0x60001000  A5      : 0x00000001  
A6      : 0x00000000  A7      : 0x4085d4ec  S2      : 0x00000000  S3      : 0x00000000  
S4      : 0x00000000  S5      : 0x00000800  S6      : 0x00000000  S7      : 0x00000000  
S8      : 0x00000000  S9      : 0x00000000  S10     : 0x00000000  S11     : 0x00000000  
T3      : 0x00000000  T4      : 0x00000000  T5      : 0x00000000  T6      : 0x00000000  
MSTATUS : 0x00001881  MTVEC   : 0x40800003  MCAUSE  : 0x00000018  MTVAL   : 0x00000000  
MHARTID : 0x00000000  

Stack memory:
4085d2d0: 0x00000001 0x4085d2f8 0x00000001 0x42008bc6 0x00000000 0x00000000 0x00000001 0x420092ae
4085d2f0: 0x4085d380 0x4085d300 0x00080195 0x00780a0a 0x420228c8 0x00000000 0x00000000 0x00000000
4085d310: 0x00000000 0x00000000 0x00000001 0x4200679a 0x0001c200 0x00000003 0x00000000 0x00000001
4085d330: 0x00000000 0x00000000 0x00000009 0x00000000 0x00000000 0x00000000 0x00000000 0x40807140
4085d350: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d370: 0x00000000 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0x00000150
4085d390: 0x4085d150 0x00000000 0x4080e540 0x4080e540 0x4085d390 0x4080e538 0x0000000f 0x00000000
4085d3b0: 0x00000000 0x4085d390 0x00000000 0x0000000a 0x4085c78c 0x74726175 0x6863655f 0x61745f6f
4085d3d0: 0x00006b73 0x4085d380 0x0000000a 0x00000000 0x00000000 0x00000000 0x00000000 0x4080eeb8
4085d3f0: 0x4080ef20 0x4080ef88 0x00000000 0x00000000 0x00000001 0x00000000 0x00000000 0x00000000
4085d410: 0x42006652 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d430: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d450: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d470: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d490: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d4b0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d4d0: 0x00000000 0x00000000 0x00000000 0x00000000 0x0000007c 0x00000001 0x00000000 0x4085e21c
4085d4f0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x4085d564 0x00000000 0x00000101
4085d510: 0x00000000 0x00000000 0x0000000a 0x4085e198 0x00000000 0x00000000 0x00000000 0x00000000
4085d530: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x4085d768 0x00000000 0x4085e038
4085d550: 0x4085dfe0 0x4085e140 0x4085e0e8 0x4085e090 0x00000200 0x00000000 0x00000000 0x00000000
4085d570: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d590: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d5b0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d5d0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d5f0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d610: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d630: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d650: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d670: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d690: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
4085d6b0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000

Diagnostic report archive.

No response

More Information.

1. The codes runs fine for the first time, when I input words by uart to trigger esp_restart(), the iwdt timeout and restarts infinitely, until I press the reset button.
2. With the same code, it doesn't happen on esp32C3.
3. When I add uart_driver_delete before restart, it works fine.

[lucaross90]

I've seen the same behavior.

As you wrote I solved in the same way .Before calling esp_restart , I've added a function that de-initializes the UART and everything seems to be resolved. The problem arises with low level resets and with the various assert()s. In those cases, the problem reappears.

How can this be handled?

[404-code]

I've seen the same behavior.

As you wrote I solved in the same way .Before calling esp_restart , I've added a function that de-initializes the UART and everything seems to be resolved. The problem arises with low level resets and with the various assert()s. In those cases, the problem reappears.

How can this be handled?

it doesn't seem to be solved, the uart install driver is stuck in critical section. Just wait for epressif staff to resolve this @lucaross90
PS：due to develop the matter program, I have found that putting initialize the uart driver after matter server init, it works fine.

[songruo]

Hi @404-code, if my reproduce and analysis is not wrong, it should be with uart_driver_delete added before restart, then interrupt wdt would happen; By commenting out uart_driver_delete, the program should work fine after restart?

[404-code]

Hi @songruo ,Adding uart_driver_delete is to solve the idwt timeout problem. If the code didn't add the function uart_driver_delete, when system restart, it would go wrong and logged the info: Guru Meditation Error: Core 0 panic'ed (Interrupt wdt timeout on CPU0)
idf commit hash is f1a1df9

[songruo]

@404-code Ok, I see! The case you described only happens to v5.5 branch. Will do a related fix to v5.5 soon.

[404-code]

@404-code Ok, I see! The case you described only happens to v5.5 branch. Will do a related fix to v5.5 soon.

Please let me know if it were fixed,thank you. @songruo

[q38678466]

这个问题修复好了吗 @songruo

[lucaross90]

Has the problem been solved? When will IDF 6 be released? @songruo