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CONFIG_FREERTOS_ISR_STACKSIZE was set to 2100 when ELF core dump was enabled, which resulted in a non-16-byte-aligned interrupt stack offset. This triggered "is SP corrupted" check in the backtrace, terminating the backtrace early. Fix the default value, and make sure that the stack is always aligned, regardless of the value of CONFIG_FREERTOS_ISR_STACKSIZE.