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Marshall Garey authored
The backfill scheduler keeps a local list of job pointers. Since the backfill scheduler yields locks, it's possible for pending jobs to be canceled and purged in these yield periods. The backfill scheduler then has pointers to now invalid memory, and dereferencing those pointers is undefined behavior and may result in a segfault. This commit prevents purging jobs while the backfill scheduler is running. Bug 6621
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