John David Anglin wrote... > The sync operations for double word operations were introduced in gcc on > 2014-11-21. > These require kernel support. I suspect the stalls occur because your > kernel is too old and > doesn't support double-word atomics. Didn't think of such a thing, and indeed I'm running my own kernel, currently 4.9 and 4.13. Comparing the .config file to the one provided by the Debian package I didn't see anything obvious. Do you have a suggestion what might be missing? For the records, GENERIC_ATOMIC64 is set. > Debian kernel from > unstable would resolve the problem. I'll give that a try. > Helge can provide an account on phantom for development if necessary. That's nice but will hopefully not be necessary. For the time being, I'm more interested in a "same here" or "works for me" so I get a better idea what to look for. Christoph
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