Date: Wed, 6 Sep 1995 16:42:06 +0200 From: se@zpr.uni-koeln.de (Stefan Esser) To: Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr> Cc: current@freebsd.org Subject: Re: crash (ncr problem?) Message-ID: <199509061442.AA21562@Sysiphos> In-Reply-To: Jean-Marc Zucconi <jmz@cabri.obs-besancon.fr> "crash (ncr problem?)" (Sep 6, 15:43)
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On Sep 6, 15:43, Jean-Marc Zucconi wrote:
} Subject: crash (ncr problem?)
} Hi,
}
} I had a crash on a very current system (make world and kernel from
} yesterday), in addition to the sig11's:
} Sep 6 08:21:15 qix /kernel: t virtual address = 0x0
} Sep 6 08:21:15 qix /kernel: fault code = supervisor read, page not present
} Sep 6 08:21:16 qix /kernel: instruction pointer = 0x8:0xf017f45f
} Sep 6 08:21:16 qix /kernel: code segment = base 0x0, limit 0xfffff, type 0x1b
} Sep 6 08:21:16 qix /kernel: = DPL 0, pres 1, def32 1, gran 1
} Sep 6 08:21:16 qix /kernel: processor eflags = interrupt enabled, resume, IOPL = 0
} Sep 6 08:21:16 qix /kernel: current process = Idle
} Sep 6 08:21:16 qix /kernel: interrupt mask = bio
} Sep 6 08:21:17 qix /kernel: panic: page fault
} Sep 6 08:21:17 qix /kernel:
} Sep 6 08:21:17 qix /kernel: syncing disks...
} Sep 6 08:21:20 qix /kernel: panic: page fault
} Sep 6 08:21:20 qix /kernel:
} Sep 6 08:21:20 qix /kernel: dumping to dev 1, offset 0
} Sep 6 08:21:20 qix /kernel: dump 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
}
} 0xf017f45f is in ncr_exception() and 0xf0110781 is in tsleep()
Hmm, I had added some debug output code to the
ncr_exception handler. There might be a NULL
pointer dereference in some special situation
somewhere, though I wouldn't expect this ...
I'll disable that code again, as soon as I find
time to upload another set of patches (later today).
You can try doing so yourself. Locate the line
containing a string of 'ERROR (' and remove the
code below the printing of the 'reg:' line
(script instructions and scatter gather table).
(Sorry don't have access to my FreeBSD system,
currently.)
Regards, STefan
--
Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021
Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160
==============================================================================
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