Date: Tue, 5 Oct 2004 10:00:15 -0400 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-arch@FreeBSD.org Cc: Stephan Uphoff <ups@tree.com> Subject: Re: scheduler (sched_4bsd) questions Message-ID: <200410051000.15379.jhb@FreeBSD.org> In-Reply-To: <1096945958.46385.44.camel@palm.tree.com> References: <1095468747.31297.241.camel@palm.tree.com> <20041004184939.GA8178@peter.osted.lan> <1096945958.46385.44.camel@palm.tree.com>
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On Monday 04 October 2004 11:12 pm, Stephan Uphoff wrote: > On Mon, 2004-10-04 at 14:49, Peter Holm wrote: > > On Mon, Oct 04, 2004 at 01:34:38PM -0400, Stephan Uphoff wrote: > > ---- snip ---- > > > > - but my time budget is limited and Peter has an interesting bug left > > > that has priority. > > > > I'm not closer to being able to create this panic in a controlled way. > > After a whole day of different tests I finally got this panic: > > http://www.holm.cc/stress/log/cons81.html. The trigger seems to be one > > particular Java applet, but it is not easily reproduceable. > > > > - Peter > > ---- snip ---- > > I found a race condition in sleepq_catch_signals / sleepq_resume_thread > that may cause sleepq_resume_thread to add a thread to the run queue > that is already there. Note that setrunnable() checks the thread state and doesn't call setrunqueue if the thread is already on the runqueue (see the TDS_RUNQ case in the switch statement). Is this what you are referring to? -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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