Linux clock_gettime(CLOCK_MONOTONIC) strange non-monotonic behavior

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man clock_gettime says:

CLOCK_MONOTONIC_RAW (since Linux 2.6.28; Linux-specific)

Similar to CLOCK_MONOTONIC, but provides access to a raw hardware-based time that is not subject to NTP adjustments.

Since CLOCK_MONOTONIC_RAW is not subject of NTP adjustments, I guess CLOCK_MONOTONIC could be.

We had similar problems with Redhat Enterprise 5.0 with 2.6.18 kernel and some specific Itanium processor. We couldn’t reproduce it with other processor on the same OS. It was fixed in RHEL 5.3 with slightly newer kernel and some Redhat patches.

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