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The “canonicalize” function was added to a recent ISO C TS as a math function, and xenstored overrides it. This could interfere with the correct operation of other libraries in the same process image. The function defined by xenstored should be renamed.
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle. Changing version to '26'.
Observed in xen-runtime-4.8.0-2.fc26.x86_64, but not xen-runtime-4.8.0-8.fc27.x86_64. Fixed by xen.canonicalize.patch.