taskstats ABI breakage

taskstats ABI breakage

Posted Jul 4, 2025 16:11 UTC (Fri) by JohnMoon (subscriber, #157189)
In reply to: taskstats ABI breakage by pabs
Parent article: Kernel API specification and validation

Notably, there's already some tooling in the kernel that could have caught this particular breakage. Apparently, nobody ran it:

./scripts/check-uapi.sh -b 658eb5ab916ddc92f294dbce8e3d449470be9f86 -i
--- snip ---
==== ABI differences detected in include/linux/cgroupstats.h from \
658eb5ab916ddc92f294dbce8e3d449470be9f86^1 - 658eb5ab916ddc92f294dbce8e3d449470be9f86 ====
    [C] 'struct taskstats' changed:
      type size changed from 3456 to 3968 (in bits)
      8 data member insertions:
     --- snip ---
      50 data member changes:
        '__u64 blkio_count' offset changed from 256 to 320 (in bits) (by +64 bits)
        '__u64 blkio_delay_total' offset changed from 320 to 384 (in bits) (by +64 bits)
      ...

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