of scheduling next run pfsync_bulk_update(), pfsync_bulk_fail()
was scheduled.
This lead to instant 100% state leak after first bulk update
request.
- After above fix, it appeared that pfsync_bulk_update() lacks
locking. To fix this, sc_bulk_tmo callout was converted to an
mtx one. Eventually, all pf/pfsync callouts should be converted
to mtx version, since it isn't possible to stop or drain a
non-mtx callout without risk of race.
- Add comment that callout_stop() in pfsync_clone_destroy() lacks
locking. Since pfsync0 can't be destroyed (yet), let it be here.
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