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TheAppleDoctor · 07-25-2002, 01:26 AM

What is a kern protection failure, and what causes it? From time to time I get an unexpected quit in various programs (no one culprit or action that I can identify). Without fail, whatever the program is, the console crash log always starts out with the same message.

Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000009

Anyone?

QS DP800, OS X 10.1.5 (5S66), 1.5GB RAM

MikeMc · 07-25-2002, 01:35 AM

IINM, it's something in the kernel reaching into protected memory... maybe a dangling pointer? Have you installed anything recently?

Izzy · 07-25-2002, 01:37 AM

man I hate it when my pointers dangle...

I've always wondered what those lines of text mean when you get a kernel panic like that...i've only had it happen once thankfully

nkuvu · 07-25-2002, 01:49 AM

IINM? "If I'm New Mexico"?

It could also be something reaching into kernel memory space... maybe.

Klink · 07-25-2002, 02:04 AM

Could even be drivers for a device Doc, like a usb mouse or printer, firewire something, blah blah blah.

Any new hardware or drivers for hardware?

TheAppleDoctor · 07-25-2002, 03:18 AM

New keyboard drivers (MacAlly iMediaKey), new firewire webcam drivers (iBot), new USB 2.0 card drivers...

If that is the direction of the likely cause of the problem, I'll try removing them one at a time and see what happens. As I said, it doesn't happen at any one time or with with any one program, so it may take awhile to isolate the cause, but at least it's a start. Any particular one most likely?

Thanks fot the help!

MikeMc · 07-25-2002, 03:29 AM

If it doesn't really matter, I would say go for the webcam drivers first. How often does it happen... I know its sporatic, but usually when I have failures I can say that they will happen every 2-3 days... so you have some idea of how long to run with the new config before ensuring that's the problem.. If it happens every 2-3 days, I would say run 4 days, if no error, reinstall it, and try for 4 more days... if you fail, there's your problem...

TheAppleDoctor · 07-25-2002, 04:16 AM

sometimes a couple within a couple of hours, then days without. As for a schedule, it seems to happen just about the time I quit thinking about it.

yvey: I'll try the webcam drivers first... it's not like I use the cam for much of anything.

BoA · 07-25-2002, 09:47 AM

Quote:

TheAppleDoctor wrote:
Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000009

This is telling you a who, what and where for a dangling pointer or memory corruption.

The error is the result of the processor executing an instruction that requested a read from a chunk of memory that was protected from user mode access. The value of the at, being such a low address in memory indicates (to me) that "something bad" happened like a memory corruption resulting in the instruction pointer being set to an address in a data segment (typically, data addresses start on the low end and instruction addresses start on the high end of memory.

The other two numbers are merely codes from the processor/os indicating the nature of the error.

There are a million ways to cause this most of which fit into three basic classes.

An unverified pointer being used to access memory, or
A corruption of memory through a bad pointer resulting in "random data" being used as a pointer reference, or
A bad instruction pointer changing the processor to load a bogus instruction.

TheAppleDoctor · 07-25-2002, 09:52 AM

Translation? :?:

07-25-2002, 01:26 AM	#1 (permalink)
TheAppleDoctor Grumpy Old Man™ Join Date: Jan 2002 Location: The Great White North Posts: 11,486 Credits: 3,460 Blog Entries: 2	Kern protection failure What is a kern protection failure, and what causes it? From time to time I get an unexpected quit in various programs (no one culprit or action that I can identify). Without fail, whatever the program is, the console crash log always starts out with the same message. Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000009 Anyone? QS DP800, OS X 10.1.5 (5S66), 1.5GB RAM __________________ The man that hath no music in himself, nor is not moved with concord of sweet sounds, is fit for treasons, stratagems, and spoils; The motions of his spirit are dull as night, and his affections dark as Erebus. Let no such man be trusted. Mark the music. ~ William Shakespeare: The Merchant of Venice. Act. v. Sc. 1. ~

07-25-2002, 01:37 AM	#3 (permalink)
Izzy Senior Member Join Date: Jun 2002 Location: Ohio Posts: 865 Credits: 379	man I hate it when my pointers dangle... I've always wondered what those lines of text mean when you get a kernel panic like that...i've only had it happen once thankfully __________________ <span style=\'font-size:8pt;line-height:100%\'><a href=\'http://izzy.typepad.com\' target=\'_blank\'>Undisclosed Location</a> - my home on the web. And oh yeah, <a href=\'http://www.last.fm/user/izzymusic\' target=\'_blank\'>here's what I'm listening to</a>.</span>

07-25-2002, 03:18 AM	#6 (permalink)
TheAppleDoctor Grumpy Old Man™ Join Date: Jan 2002 Location: The Great White North Posts: 11,486 Credits: 3,460 Blog Entries: 2	New keyboard drivers (MacAlly iMediaKey), new firewire webcam drivers (iBot), new USB 2.0 card drivers... If that is the direction of the likely cause of the problem, I'll try removing them one at a time and see what happens. As I said, it doesn't happen at any one time or with with any one program, so it may take awhile to isolate the cause, but at least it's a start. Any particular one most likely? Thanks fot the help! __________________ The man that hath no music in himself, nor is not moved with concord of sweet sounds, is fit for treasons, stratagems, and spoils; The motions of his spirit are dull as night, and his affections dark as Erebus. Let no such man be trusted. Mark the music. ~ William Shakespeare: The Merchant of Venice. Act. v. Sc. 1. ~

07-25-2002, 04:16 AM	#8 (permalink)
TheAppleDoctor Grumpy Old Man™ Join Date: Jan 2002 Location: The Great White North Posts: 11,486 Credits: 3,460 Blog Entries: 2	sometimes a couple within a couple of hours, then days without. As for a schedule, it seems to happen just about the time I quit thinking about it. yvey: I'll try the webcam drivers first... it's not like I use the cam for much of anything. __________________ The man that hath no music in himself, nor is not moved with concord of sweet sounds, is fit for treasons, stratagems, and spoils; The motions of his spirit are dull as night, and his affections dark as Erebus. Let no such man be trusted. Mark the music. ~ William Shakespeare: The Merchant of Venice. Act. v. Sc. 1. ~

07-25-2002, 09:47 AM	#9 (permalink)
BoA Senior Member Join Date: Nov 2001 Location: Issaquah, WA Posts: 1,621 Credits: 397	Re: Kern protection failure Quote: TheAppleDoctor wrote: Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000009 This is telling you a who, what and where for a dangling pointer or memory corruption. The error is the result of the processor executing an instruction that requested a read from a chunk of memory that was protected from user mode access. The value of the at, being such a low address in memory indicates (to me) that "something bad" happened like a memory corruption resulting in the instruction pointer being set to an address in a data segment (typically, data addresses start on the low end and instruction addresses start on the high end of memory. The other two numbers are merely codes from the processor/os indicating the nature of the error. There are a million ways to cause this most of which fit into three basic classes. An unverified pointer being used to access memory, or A corruption of memory through a bad pointer resulting in "random data" being used as a pointer reference, or A bad instruction pointer changing the processor to load a bogus instruction. __________________ Bo... <span style=\'color:navy\'><span style=\'font-family:courier\'>SELECT * FROM users WHERE clue > 0;</span> <span style=\'color:green\'>0 Rows Returned.</span></span>

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07-25-2002, 01:35 AM	#2 (permalink)
MikeMc Senior Member Join Date: Jun 2002 Posts: 1,313 Credits: 4,455	IINM, it's something in the kernel reaching into protected memory... maybe a dangling pointer? Have you installed anything recently?

07-25-2002, 01:49 AM	#4 (permalink)
nkuvu Senior Member Join Date: Jun 2002 Location: Tucson, AZ Posts: 5,957 Credits: 479	IINM? "If I'm New Mexico"? It could also be something reaching into kernel memory space... maybe.

07-25-2002, 02:04 AM	#5 (permalink)
Klink Senior Member Join Date: Jun 2002 Location: nyc Posts: 1,962 Credits: 260	Could even be drivers for a device Doc, like a usb mouse or printer, firewire something, blah blah blah. Any new hardware or drivers for hardware?

07-25-2002, 03:29 AM	#7 (permalink)
MikeMc Senior Member Join Date: Jun 2002 Posts: 1,313 Credits: 4,455	If it doesn't really matter, I would say go for the webcam drivers first. How often does it happen... I know its sporatic, but usually when I have failures I can say that they will happen every 2-3 days... so you have some idea of how long to run with the new config before ensuring that's the problem.. If it happens every 2-3 days, I would say run 4 days, if no error, reinstall it, and try for 4 more days... if you fail, there's your problem...

07-25-2002, 09:52 AM	#10 (permalink)
TheAppleDoctor Grumpy Old Man™ Join Date: Jan 2002 Location: The Great White North Posts: 11,486 Credits: 3,460 Blog Entries: 2	Translation? :?: __________________ The man that hath no music in himself, nor is not moved with concord of sweet sounds, is fit for treasons, stratagems, and spoils; The motions of his spirit are dull as night, and his affections dark as Erebus. Let no such man be trusted. Mark the music. ~ William Shakespeare: The Merchant of Venice. Act. v. Sc. 1. ~

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