Date: Tue, 07 Sep 2004 16:28:21 -0400 From: Joe Marcus Clarke <marcus@marcuscom.com> To: John Baldwin <jhb@freebsd.org> Cc: current@freebsd.org Subject: Re: Kernel panic in 6.0 revisited Message-ID: <1094588796.745.82.camel@gyros> In-Reply-To: <200409071442.18490.jhb@FreeBSD.org> References: <1094273843.92485.11.camel@shumai.marcuscom.com> <200409071442.18490.jhb@FreeBSD.org>
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On Tue, 2004-09-07 at 14:42, John Baldwin wrote:
> On Saturday 04 September 2004 12:57 am, Joe Marcus Clarke wrote:
> > A few days ago, I reported a kernel panic in HEAD while building
> > packages on my tinderbox machine. I was unable to get a core dump fro
> > that crash, and after switching from ULE to 4BSD, I had thought it had
> > gone away.
> >
> > Well, today, the machine panicked twice. It was the same panic both
> > times, and the same panic I got a few days ago. This time, however, I
> > was able to get a core dump. Here is the panic message:
> >
> > Fatal trap 12: page fault while in kernel mode
> > cpuid =3D 0; apic id =3D 00
> > fault virtual address =3D 0x1c
> > fault code =3D supervisor write, page not present
> > instruction pointer =3D 0x8:0xc0533d07
> > stack pointer =3D 0x10:0xf5f30a4c
> > frame pointer =3D 0x10:0xf5f30a58
> > code segment =3D base 0x0, limit 0xfffff, type 0x1b
> > =3D DPL 0, pres 1, def32 1, gran 1
> > processor eflags =3D interrupt enabled, resume, IOPL =3D 0
> > current process =3D 27441 (cpp0)
> > Stopped at vfs_vmio_release+0x1b: lock cmpxchgl %ecx,0x1c(%edx)
> >
> > And here is the output of "l *vfs_vmio_release+0x1b":
> >
> > 0xc0533d07 is in vfs_vmio_release (atomic.h:154).
> > 149 static __inline int
> > 150 atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
> > 151 {
> > 152 int res =3D exp;
> > 153
> > 154 __asm __volatile (
> > 155 " " __XSTRING(MPLOCKED) " "
> > 156 " cmpxchgl %1,%2 ; "
> > 157 " setz %%al ; "
> > 158 " movzbl %%al,%0 ; "
> >
> > Kernel config is at http://www.marcuscom.com/downloads/FUGU.kernel and
> > the dmesg output is at http://www.marcuscom.com/downloads/FUGU.dmesg
> >
> > Let me know if you need anything else. Thanks.
>=20
> How about 'l *0xc0533d00' to try and figure out which function is calling=
=20
> that. Also, do you have INVARIANTS turned on?
Sorry, I needed the system back up, so I rebuilt without the multi-CPU
options (SMP and apic) since this is really a single-CPU machine. Thus
far, it has not crashed, and it has done _many_ package builds. If it
crashes again, I'll be sure to get the additional info. No, I did not
have INVARIANTS or WITNESS enabled in the kernel. I still do not.
Joe
--=20
PGP Key : http://www.marcuscom.com/pgp.asc
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