Tencent Architect
Jun 24, 2024 · Operations
Root Cause Analysis of Linux Kernel Hard Lockup on CPU 51
This article walks through a real Linux kernel hard lockup case, explaining what hard lockup is, analyzing stack traces and register values, identifying a spinlock contention on a per‑CPU runqueue, and showing how an inappropriate GFP flag caused interrupts to be enabled at the wrong time, leading to a deadlock and the eventual fix.
DebuggingKernelScheduling
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