Date: Fri, 25 May 2007 14:22:40 -0400 From: Joe Marcus Clarke <marcus@marcuscom.com> To: Attilio Rao <attilio@freebsd.org> Cc: Jeff Roberson <jroberson@chesapeake.net>, Current@freebsd.org Subject: Re: Panic on -CURRENT after LDT changes Message-ID: <46572970.5080201@marcuscom.com> In-Reply-To: <3bbf2fe10705251116h1a4606fg6250d917247a5143@mail.gmail.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> <4657267C.2070306@marcuscom.com> <3bbf2fe10705251116h1a4606fg6250d917247a5143@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Attilio Rao wrote: > 2007/5/25, Joe Marcus Clarke <marcus@marcuscom.com>: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> 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. >> >> I'm stopped in the debugger now with WITNESS and friends enabled. Same >> backtrace as before. I did a "show locks" and I see: >> >> exclusive spin mutex descriptor tables r = 0 (0xc08369f8) locked @ >> /usr/src/sys/i386/i386/sys_machdep.c:629 >> >> Please let me know what else you'd like to see while I'm at the >> debugger. FYI: this is a Pentium 4 with "options SMP" disabled. > > This is a multicore? do you have PREEMPTION/FULL_PREEMPTION installed? No, single core with PREEMPTION enabled only. Joe > > Attilio > > - -- PGP Key : http://www.marcuscom.com/pgp.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGVylwb2iPiv4Uz4cRAvDaAJ0eD4swI1OvZ6vINo3TlPjnfqEUMwCgg2jo 9wB314PFlbbLLcwuX2qyOy8= =qmFu -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?46572970.5080201>