On 03/12/2020 01:20, Conrad Meyer wrote: > Hi Andriy, > > Rand(3) is explicitly unsafe to use from concurrent threads without some > external serialization, even after initialization. I’d suggest using a > different > API.
Conrad, thank you! Just want to check, unsafe in terms of bogus results (with respect to randomness) or unsafe as in may crash? > On Wed, Dec 2, 2020 at 13:53 Andriy Gapon <a...@freebsd.org > <mailto:a...@freebsd.org>> wrote: > > > Specifically, concurrent "first" calls to rand(). > There can be a moment when rand3_state is allocated but not completely > set up > with initstate_r(). > Is this a known / documented issue? > Should we try to do better? > > P.S. > I am seeing this issue from time to time when running ztest program (from > ZFS). > I guess that it uses rand() just because that's what OpenZFS did / does on > illumos and Linux. > > P.P.S. > Just realized that the problem can be relatively recent. > https://svnweb.freebsd.org/base?view=revision&revision=357382 > > -- > Andriy Gapon > -- Andriy Gapon _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
