If NMIs keep getting spammed on CPU 0 while it holds the ring buffer spinlock, it prevents the context switch program from making progress and eventually releasing the ring buffer spinlock, which in turn prevents other CPUs that want the lock (like CPU 3) from progressing as well. At a high enough sampling frequency, this can lead to the longer stalls, especially in combination with the previous issue of a minimum 1ms time before deadlock checks are triggered.
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The consequence is queries like this:
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