Date: Thu, 24 May 2007 18:38:59 +0200 From: "Attilio Rao" <attilio@freebsd.org> To: "Joe Marcus Clarke" <marcus@marcuscom.com> Cc: Jeff Roberson <jroberson@chesapeake.net>, Current@freebsd.org Subject: Re: Panic on -CURRENT after LDT changes Message-ID: <3bbf2fe10705240938s730d2793o1e3da6fdea8cf039@mail.gmail.com> In-Reply-To: <1180024496.10757.34.camel@shumai.marcuscom.com> References: <1179962663.75721.6.camel@shumai.marcuscom.com> <20070523165051.G9443@10.0.0.1> <4655D5C1.2010905@FreeBSD.org> <1180022919.10757.24.camel@shumai.marcuscom.com> <3bbf2fe10705240930o10f37febt9fb5f0a46bd193c3@mail.gmail.com> <1180024496.10757.34.camel@shumai.marcuscom.com>
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2007/5/24, Joe Marcus Clarke <marcus@marcuscom.com>: > On Thu, 2007-05-24 at 18:30 +0200, Attilio Rao wrote: > > 2007/5/24, Joe Marcus Clarke <marcus@marcuscom.com>: > > > On Thu, 2007-05-24 at 20:13 +0200, Attilio Rao wrote: > > > > Jeff Roberson wrote: > > > > > Thanks, Attilio and I will look at this right away. > > > > > > > > > > Jeff > > > > > > > > > > On Wed, 23 May 2007, Joe Marcus Clarke wrote: > > > > > > > > > >> On a -CURRENT build today with Jeff's LDT locking changes, I get an > > > > >> instant, reproducible panic by doing: > > > > >> > > > > >> # cd /usr/src > > > > >> # make -DNO_CLEAN buildworld > > > > >> > > > > >> Backing out the LDT changes to /sys/i386/i386/*machdep* corrects the > > > > >> problem. Here is a dmesg and backtrace. In frame 6, it appears mdp is > > > > >> NULL (i.e. td->td_proc->p_md = 0x0). > > > > > > > > Did you enable WITNESS/INVARIANTS/INVARIANT_SUPPORT? > > > > > > No, this kernel does not have WITNESS or INVARIANTS. I can enable those > > > tomorrow if that would give you more useful information. > > > > It would be very appreciated, since I've been unable to reproduce your > > panic on a centrino dual core. > > Will do, but it may be that adding those options masks the bug. Have > you tried without them? Yes, I tried both. And please don't add WITNESS_SKIPSPIN since the dt_lock is a spinlock. Thanks a lot, Attilio -- Peace can only be achieved by understanding - A. Einstein
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