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In trying to reproduce the race in #24380, my system tripped over the stat "blocks" field changing in this test. The value was almost always 8 (effectively 4k) or very infrequently 0 (I saw the 0 from both `fstat` and `fstatat`). I believe the underlying filesystem is free to asynchronously change this value. For example, if it migrates a file between some "inline" or maybe journal storage, and actual on-disk blocks. So it seems plausible that its allowed to change between stat calls. Breaking up the struct comparison this way means we also don't compare any of the padding or "reserved" fields, too. And we can narrow down the s390x-linux work-around. |
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