On Apr 30, 2013, at 18:34, Jan Beich <jbe...@tormail.org> wrote:
...
> The faulting function is lost within crash handler. If you build
> firefox with
>
> # use DEBUG_FLAGS or set STRIP to empty explicitly
> CFLAGS += ${DEBUG_FLAGS}
> DEBUG_FLAGS += -O0 -g
>
> jaeger jit crash would look like
>
> http://lists.freebsd.org/pipermail/freebsd-current/2013-April/041165.html
The firefox crash in that post was with -O2, so it is most likely not due to
the vectorizer then.
In any case, I have not been able to reproduce that either. I have browsed
stackoverflow.com for about 5 minutes, clicking a whole bunch of random
articles and links, and no problems whatsoever occurred. That is with the
default www/firefox port, which seems to be the released Firefox 20.0, at its
default settings, on amd64.
> It doesn't happen on firefox23 with baseline jit[1] disabled via pref.
> A big change like zones (bug 759585) may have refactored code enough
> to not hit the clang bug. So, try either clang trunk or
>
> http://trillian.chruetertee.ch/freebsd-gecko/changeset/1256/trunk/www/firefox/files/patch-clang33
>
> The latter pessimizes inlining for clang 3.2 as well.
>
> [1] baseline crashes in a different way
> https://bugzilla.mozilla.org/show_bug.cgi?id=860867
I do not like the workaround in that Mozilla bug, since it simply disables the
vectorizer. I can understand that software must always ship tomorrow, but it
would have been nicer to attempt to figure out what is incorrectly optimized,
and why...
>> Rebuilding with debugging symbols provides no further insight, as that
>> seems to provide a work-around for whatever the root cause may be
>> (i.e. no more segfaults).
>
> DEBUG enables compile-time diagnostics and strips any -O* from CFLAGS.
Indeed. To work around this, use the following diff:
Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk (revision 316903)
+++ Mk/bsd.port.mk (working copy)
@@ -1580,7 +1580,7 @@
.if defined(WITH_DEBUG) && !defined(WITHOUT_DEBUG)
STRIP_CMD= ${TRUE}
DEBUG_FLAGS?= -g
-CFLAGS:= ${CFLAGS:N-O*:N-fno-strict*} ${DEBUG_FLAGS}
+CFLAGS:= ${CFLAGS} ${DEBUG_FLAGS}
.endif
.if defined(NOPORTDOCS)
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