Date: Fri, 10 Sep 2010 18:31:03 +0300 From: Alexander Motin <mav@FreeBSD.org> To: "Thomas E. Spanjaard" <tgen@deepbone.net>, FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: Eventtimers b0rking w/ math/atlas Message-ID: <4C8A4F37.6000103@FreeBSD.org> In-Reply-To: <mailpost.1284127430.4677345.26545.mailing.freebsd.current@FreeBSD.cs.nctu.edu.tw> References: <mailpost.1284127430.4677345.26545.mailing.freebsd.current@FreeBSD.cs.nctu.edu.tw>
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Hi. Thomas E. Spanjaard wrote: > While trying to build math/atlas on a FreeBSD/amd64 9.0-CURRENT r212411, > the kernel hangs at some point when math/atlas tries to run some tests > (presumably the ones to profile the code and optimise). The kernel > spouts messages about Starting event timers: LAPIC @ 1000Hz, HPET @ > 127Hz; then LAPIC @ 1000Hz, HPET @ 8128Hz (iirc), back, then back again. > After that, the system is no longer responsive, and eventually panic()s > because some spinlock has been held too long in the pmap TLB invalidate > code. Couldn't get a dump, because I had no dumpdev configured. > > Anyone else see this problem? I'm trying to reproduce it by building > other ports (it has survived gcc44, gcc45, llvm and clang so far), but > only math/atlas seems to trigger it. It is reported deadlock between event timers and some IPI senders, like TLB invalidation, during switching to/from profiling clock rate. In forthcoming version of event timer patch this problem should not happen. You can get latest version of the patch here: http://people.freebsd.org/~mav/timers_oneshot13.patch -- Alexander Motin
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