From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Cc: Scott Wood <scottwood@freescale.com>,
"linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
Rex Feany <RFeany@mrv.com>
Subject: Re: [PATCH 0/6] PowerPc 8xx TLB/MMU fixes
Date: Tue, 06 Oct 2009 09:37:28 +1100 [thread overview]
Message-ID: <1254782248.7122.49.camel@pasglop> (raw)
In-Reply-To: <OF9AD6CA21.DCD59A1B-ONC1257646.007AE622-C1257646.007BB767@transmode.se>
On Tue, 2009-10-06 at 00:31 +0200, Joakim Tjernlund wrote:
>
> regs or regs->nip is NULL? Either one does not make sense
> In any case it might be a secondary problem as DAR is NULL already
> when you
> enter the page fault.
> >
> > insn = *((unsigned long *)regs->nip);
> > c000e110: 80 a9 00 00 lwz r5,0(r9)
> >
> > fails.
>
> hmm, I wonder if you managed to invalidate the a kernel TLB?
> Are you using pinned kernel TLBs?
You should not dereference a user address like that. Use get_user !
Obviously you got 0 in SRR0 for some reason (somebody tried to jump
to 0, either intentionally or as a result of some other problem) and
the above will crash the kernel when it happens.
Cheers,
Ben.
next prev parent reply other threads:[~2009-10-05 22:37 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-05 12:16 [PATCH 0/6] PowerPc 8xx TLB/MMU fixes Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 1/6] 8xx: DTLB Error must check for more errors Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 2/6] 8xx, fault: Add some debug code to do_page_fault() Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 3/6] 8xx: get rid of _PAGE_HWWRITE dependency in MMU Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 4/6] 8xx: Tag DAR with 0x00f0 to catch buggy instructions Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 5/6] 8xx: Fixup DAR from buggy dcbX instructions Joakim Tjernlund
2009-10-05 12:16 ` [PATCH 6/6] 8xx: start using dcbX instructions in various copy routines Joakim Tjernlund
2009-10-05 20:17 ` [PATCH 3/6] 8xx: get rid of _PAGE_HWWRITE dependency in MMU Benjamin Herrenschmidt
2009-10-05 21:25 ` Joakim Tjernlund
2009-10-05 21:37 ` Benjamin Herrenschmidt
2009-10-05 22:00 ` Joakim Tjernlund
2009-10-05 22:09 ` Benjamin Herrenschmidt
2009-10-05 22:55 ` Joakim Tjernlund
2009-10-05 23:15 ` Benjamin Herrenschmidt
2009-10-05 23:35 ` Joakim Tjernlund
2009-10-06 0:34 ` Benjamin Herrenschmidt
2009-10-06 6:15 ` Joakim Tjernlund
2009-10-06 6:45 ` Benjamin Herrenschmidt
2009-10-06 7:54 ` Joakim Tjernlund
2009-10-06 15:40 ` Joakim Tjernlund
2009-10-06 17:28 ` Joakim Tjernlund
2009-10-06 22:05 ` Joakim Tjernlund
2009-10-06 23:25 ` Benjamin Herrenschmidt
2009-10-07 1:07 ` Benjamin Herrenschmidt
2009-10-07 7:47 ` Joakim Tjernlund
2009-10-05 18:12 ` [PATCH 0/6] PowerPc 8xx TLB/MMU fixes Scott Wood
2009-10-05 18:27 ` Joakim Tjernlund
2009-10-05 20:09 ` Scott Wood
2009-10-05 21:04 ` Joakim Tjernlund
2009-10-05 21:31 ` Benjamin Herrenschmidt
2009-10-05 21:41 ` Joakim Tjernlund
2009-10-05 21:46 ` Scott Wood
2009-10-05 21:31 ` Scott Wood
2009-10-05 22:04 ` Rex Feany
2009-10-05 22:31 ` Joakim Tjernlund
2009-10-05 22:37 ` Benjamin Herrenschmidt [this message]
2009-10-05 22:58 ` Joakim Tjernlund
2009-10-05 23:49 ` Joakim Tjernlund
2009-10-06 1:52 ` Benjamin Herrenschmidt
2009-10-06 8:06 ` Joakim Tjernlund
2009-10-06 8:32 ` Benjamin Herrenschmidt
2009-10-06 10:58 ` Joakim Tjernlund
2009-10-06 11:06 ` Benjamin Herrenschmidt
2009-10-06 11:39 ` Joakim Tjernlund
2009-10-06 13:18 ` Joakim Tjernlund
2009-10-05 22:42 ` Rex Feany
2009-10-05 23:00 ` Joakim Tjernlund
2009-10-06 6:25 ` Joakim Tjernlund
2009-10-06 6:44 ` Benjamin Herrenschmidt
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