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Old 01-04-2005, 02:39 PM   #1
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Registered: Jan 2005
Location: Somerville,nj
Distribution: 2.4.18
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Power PC 405 kernel stack overflow

I am using a Linux 2.4.18 kernel on an IBM power PC 405GP, and have seen two kernel stack overflow's. The message:

Kenels stack overflow in process c08c8000, r1=c08c8870

displays a value of r1 which appears to be obviously outside of the code and stack. Upon reading the code in arch/ppc/kernel/head/traps.c, I notice the debugger (xmon) is not started nor are the registers displayed.

Upon reading the code in arch/ppc/kernel/head_4xx.S, it appears on a stack overflow, at the label stack_ovf, the stack is reinitialized to the top of the stack. The code does basically the same computation done at the label, start_here, that initializes the stack before calling the rest of the system.

Is reinitializing the stack the correct action that should be taken on a stack overflow? Could an alternate stack be used on kernel stack overflow, so diagnostic information can be obtained?

Thank you for your time and consideration with answering these questions?

Jeff Fellin


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