ohos-issue-graphics-sysfreeze-analysis

Diagnose OpenHarmony graphics sysfreeze by analyzing appfreeze logs with two timed DFX stack captures to reconstruct the IPC blocking chain and identify the root cause of the thread block.

An IPC deadlock occurs when threads wait on each other's resources indefinitely. Blocking chain reconstruction traces from the initial blocked thread through locks, semaphores, and IPC relationships to find the non-blocked final blocker.

Analyze task queue blocking by validating time gaps between watchdog DFX captures and inspecting VIP, Immediate, High, Low, and Idle task queues alongside hilog_kmsg to correlate scheduled workloads with the freeze event.

Yes, you need symbol-resolved stacks from lib.unstripped symbols analyzed via llvm-addr2line tooling to accurately trace the blocking chain and perform root-cause assessment for OpenHarmony graphics freezes.

Yes, you can incorporate system state signals like ReclaimAvailBuffer and ThermalLevel during process freeze analysis to avoid misattributing sysfreeze events to application logic when resource constraints are the actual cause.

A THREAD_BLOCK_6S event indicates a specific thread has been blocked for six seconds. You must trace the stack captures through locks or condition waits to find the non-blocked final blocker causing this freeze.