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Bugfixes for checksum generation

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@bbockelm bbockelm released this 07 Nov 21:41
· 9 commits to master since this release

This release fixes a potential double-free that may occur when a checksum file must be regenerated due to an added checksum type.

This double-free was observed at UCSD when CVMFS checksums were requested for files written prior to the CVMFS-style checksum support.

Further, this release fixes a potential deadlock in the SIGSEGV signal handler due to prior use of async signal unsafe functions.