socd-ap-wdt — Unknown

This is not a panic written by iOS: the main processor (AP) froze completely, the chip's hardware watchdog forced a restart, and on the next boot the system only recovered the SOCD report (“SoC diagnostics”, diagnostic data kept in the SMC's SRAM). Hence a very short file, with no backtrace or driver name: the real cause is in the encoded SOCDContainers block, unreadable here. On iPhone, public reports (iPhone 12 Pro, 14 Pro Max, 15 Pro) never led to an identified part; on M1 Macs, several cases ended with a logic board replacement, others with an update or the removal of a USB peripheral.

iPhone

Undetermined — main processor frozen, cause not written in the log; software first

Low confidenceVerified sourceUnknown

First check

Look for other panic-full logs from the same device at the same time or in the previous days (they often point to the real component).

Sources