Date: Fri, 5 Nov 2004 19:22:53 -0800 From: Pascal Hofstee <caelian@gmail.com> To: Jeff Roberson <jeff@freebsd.org> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/kern sched_ule.c Message-ID: <d8a0b76204110519223860ef33@mail.gmail.com> In-Reply-To: <200410300735.i9U7ZrL2031884@repoman.freebsd.org> References: <200410300735.i9U7ZrL2031884@repoman.freebsd.org>
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On Sat, 30 Oct 2004 07:35:53 +0000 (UTC), Jeff Roberson <jeff@freebsd.org> wrote: > jeff 2004-10-30 07:35:53 UTC > > FreeBSD src repository > > Modified files: > sys/kern sched_ule.c > Log: > - In sched_prio() check to see if the kse is assigned to a runq as the > check for TD_ON_RUNQ() no longer means the thread is really on a run- > queue. I suspect this state should be re-evaluated as it must mean > something else now. This fixes ULE+KSE+PREEMPTION on UP x86. Hi Jeff, I decided to take this commit as a good moment to give SCHED_ULE + PREEMPTION a shot again in the hope of triggering potential bugs to further improve SCHED_ULE. And i must say ... without INVARIANTS/WITNESS ... SCED_ULE + PREEMPTION == SOLID ... No Panics for well over 2 days during general desktop usage and compilation. I then decided to give it a real stress-test and decided to also enable WITNESS, INVARIANTS and FULL_PREEMPTION. This combination seemed just as stable at first ... untill i decided to shutdown Firefox .. which caused a system panic with the famous "Negative nice count" KASSERT from kern/sched_ule.c I did some additional testing and so far it seems that Every threaded application seems to exhibit this panic upon exit. I don't have an actual kerneldump at the moment ... but i should be able to generate one and provide additional information and/or a backtrace if desired. To reproduce simply exit a multi-threaded application ... firefox, ogg123 and apache-worker all caused the same panic. This is on a UP P2-400 MHz running 6.0-CURRENT as of November 3rd or 4th, With kind regard, Pascal Hofstee
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