Examples
16 logs, each with the findings Firmlog returns for it. Open one to see the full analysis.
HardFault with register dump
STM32F4A forced HardFault with CFSR, HFSR and BFAR. The fault bits are decoded and tied to an I2C timeout 60 ms earlier.
- Critical: HardFault / CPU Panic
Guru Meditation panic
ESP32A LoadProhibited panic with register dump and backtrace. The faulting address points at a NULL pointer plus an offset.
- Critical: HardFault / CPU Panic
Task watchdog
ESP-IDFThe task watchdog fires twice. The report names the task that hogged the CPU and the one that starved.
- Critical: Watchdog Reset
Watchdog reset and boot loop
STM32H7A sensor init keeps failing on I2C, the watchdog resets the board, and the boot banner repeats.
- Critical: Watchdog Reset
- Critical: Possible Boot Loop
- Warning: I2C Bus Error
- Warning: Device Init Failure
Kernel assertion
ZephyrAn ASSERTION FAIL in the Bluetooth host escalates to a kernel oops with the faulting PC and thread.
- Critical: HardFault / CPU Panic
- Critical: Assertion / Firmware Abort
- Warning: Uncategorized Error
I2C device dropping off the bus
STM32H7One IMU goes from NACKs to a stuck bus to offline while two other devices on the same bus stay healthy.
- Critical: I2C Bus Fault
- Warning: Fallback / Degraded Mode
SD card write failure
Linux dmesgA write times out, the journal aborts, and the filesystem is remounted read-only.
- Critical: Storage / Media I/O Failure
Brownout reset
ESP32The brownout detector fires during boot and resets the chip.
- Warning: Brownout / Power Reset
Task stack overflow
FreeRTOSThe stack-overflow hook fires and names the task that ran out of stack.
- Critical: RTOS Stack Overflow
Fatal CPU exception
ZephyrA HardFault escalation reported by the Zephyr fatal-error handler.
- Critical: HardFault / CPU Panic
Sensors failing to initialize
ESP32-S3Two sensors fail on I2C: no ACK, an ID mismatch, and an arbitration loss.
- Warning: I2C Bus Error
- Warning: Device Init Failure
UART framing and overrun
UARTA noisy serial link reports an RX timeout, a framing error, and an overrun.
- Warning: UART Error
- Warning: Uncategorized Error
SPI transfer errors
RP2040An SPI flash transfer fails with a CRC error and an RX FIFO overflow.
- Warning: SPI Transfer Error
- Warning: Uncategorized Error
Early warnings, no crash
STM32L4Nothing faults, but a clock fallback, a thermal limit breach, dropped messages, and a late watchdog kick all show up.
- Warning: Watchdog Margin Erosion (near-miss)
- Warning: Threshold Breach
- Warning: Recurring: RTC Backup Domain Reset
- Warning: Fallback / Degraded Mode
- Warning: Recurring: Queue / Buffer Backpressure
Recovered faults
STM32L4A recovered stack overflow, a retried I2C NACK, an ADC reading pinned to the rail, and a corrected flash ECC error.
- Critical: RTOS Stack Overflow
- Warning: ADC Reading Out of Range
- Warning: I2C Bus Error
Healthy boot
nRF52A normal boot with nothing wrong. The analyzer should stay quiet.
Nothing found — a healthy log.
Open in analyzer
