Date: Tue, 24 Jan 2017 15:29:49 +0100 From: Romain =?iso-8859-1?Q?Tarti=E8re?= <romain@blogreen.org> To: mono@freebsd.org Subject: Re: SIGSEGV crash on SMP Xeon E5, can't build from ports Message-ID: <20170124142949.GB87248@FreeBSD.org> In-Reply-To: <CAA3Uwx2-LEiB3=5EnoqpKKNPP0%2BVGGZ9TvyeJB8oeBY%2BxxwtSA@mail.gmail.com> References: <CAA3Uwx2-LEiB3=5EnoqpKKNPP0%2BVGGZ9TvyeJB8oeBY%2BxxwtSA@mail.gmail.com>
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--H1spWtNR+x+ondvy Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jan 24, 2017 at 04:50:58AM +0000, Philipp Michel wrote: > I think it is related to this bug: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211367 >=20 > There are reports of several people still having this issue, seemingly all > on multiprocessor machines. >=20 > Any idea what this could be? I'm at my wits end, all I can think of now is > to run mono in a bhyve VM to get around this, which makes me a bit sad... Looking at the backtrace from #211367, the segfault comes from mono_gchandle_free(). The default Garbage Collector (GC) beeing sgen, trying to switch to boehm may confirm that this is related to a race condition in the garbage collection? mcs has a `--gc=3D[sgen,boehm]` option to test this quickly, but it should be possible to tell `./configure` to disable sgen support. Sorry to not be able to provide more than this: with 4 cores, I can't remember being hit by this problem. Romain --=20 Romain Tarti=E8re <romain@FreeBSD.org> http://people.FreeBSD.org/~romain/ pgp: 8234 9A78 E7C0 B807 0B59 80FF BA4D 1D95 5112 336F (ID: 0x5112336F) (plain text =3Dnon-HTML=3D PGP/GPG encrypted/signed e-mail much appreciated) --H1spWtNR+x+ondvy Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGzBAEBCAAdFiEEgjSaeOfAuAcLWYD/uk0dlVESM28FAliHZNwACgkQuk0dlVES M29gQQwAvreF9o9fVqVFt4czqE1b/V3z8Z2AMwe1BfQ8FjT5BUWOGfWdvGoCahc5 0Ag8pbfcUDX/ccoazRh1tNLMltfKyV9vo+IBi/hBP0Z7VC6zNpmkkbK3DDqlY9dV Sm36XzL+crYzQ1cjE1JsUyysEfnV8abF6YGVeT3jm26iB9rHTGdKaCc+9ik2DIh3 zvdI3+8SGPH7N3pJeCQ93/kUqaon8IFfRr+qPudYhBsFD8Cwo36y/zRcXq7FvCJU Qu1Ul1xUjhpUiOlgBBf5xfFxa5yU09jsLnIjNzmMpe4JvodZ/A+isDbSrs+EFJ4l ri4dmRcD3Yv5hvlXS3uHujFZ7HCqvC6Q4gg8K5bpGsIJQwdWPBu9tYHflmv1HFFX QlXN+11juvXZG19IPYjjDFWouTkxWmrBTn9fAk+c3nRsVAr6drzKYHleVVzcfptE 526Ghpvnfd+mckvzl8tHISpoc37gKcxiAgEOWlcPTnwy+UtsmtRpK1/bN17cYSIG W+AFT3Hq =vTda -----END PGP SIGNATURE----- --H1spWtNR+x+ondvy--
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