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Don't immediately restart tracker-extract on SIGSYS

Simon McVittie requested to merge wip/smcv/prevent-restart-on-sigsys into master

If the seccomp sandbox doesn't allow a necessary syscall, restarting tracker-extract is likely to make it fail again at the same syscall. In this case we don't want tracker-extract to restart in a tight loop, leaving a new core dump every time.

Mitigates: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851148

We've been applying this in Debian for a while. I know it's only a stopgap (the real solution is to fix the seccomp rules to allow everything that needs to be allowed), but it's better than nothing.

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