Date: Wed, 2 Aug 2006 14:33:49 -0700 (PDT) From: Kip Macy <kmacy@fsmware.com> To: Daniel Eischen <deischen@freebsd.org> Cc: freebsd-current@freebsd.org, John Birrell <jb@what-creek.com>, Tobias Gro?er <bsdlists@gmx.de> Subject: Re: DTRACE build failure (/usr/obj/usr/src/tmp/usr/bin/ld: cannot find -lpthread) Message-ID: <20060802141115.D71770@demos.bsdclusters.com> In-Reply-To: <Pine.GSO.4.64.0608021706040.8714@sea.ntplx.net> References: <1154527524.93666.22.camel@tobias.home.web-wahnsinn.de> <20060802194817.GA53062@what-creek.com> <Pine.GSO.4.64.0608021611310.8714@sea.ntplx.net> <20060802135246.J66851@demos.bsdclusters.com> <Pine.GSO.4.64.0608021706040.8714@sea.ntplx.net>
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I described it previously. Signals won't always be sent to the right
process, i.e. running a process under GDB the debuggee will sometimes
get the SIGTRAP instead of GDB. When restarting mysql, mysql-server
becomes unkillable. Removing KSE (bike_sched et al.) makes the problem
go away.
It is trivial to hit on sun4v. However, I've seen it (or a problem with
similar symptoms) on x86 using NetApp's development simulator which
makes very heavy use of signals. I believe NetApp ended up giving up on
using FreeBSD for running their simulator as this problem made FreeBSD a
non-starter for them. I no longer work for NetApp so I don't have access
to the sources for the simulator any more, so I don't know if bike_sched
fixes that problem for them or not.
-Kip
On Wed, 2 Aug 2006, Daniel Eischen wrote:
> On Wed, 2 Aug 2006, Kip Macy wrote:
>
> > sun4u is a dead architecture. Signals are broken with KSE on a
> > tightly coupled SMP so sun4v doesn't even have KSE in the tree.
>
> On every platform or on sparc64? I am unaware of any signal
> problems in i386.
>
> > Unless someone steps up to fix KSE "will not work" is more correct.
>
> Please clarify.
>
> --
> DE
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