Re: npxintr from nowhere

From: Bruce Evans (bde_at_zeta.org.au)
Date: 05/22/05

  • Next message: Vaibhave Agarwal: "Re: npxintr from nowhere" 
    Date: Sun, 22 May 2005 22:12:33 +1000 (EST)
To: Vaibhave Agarwal <vaibhave@cs.utah.edu>

    On Sun, 22 May 2005, Vaibhave Agarwal wrote:

    > I was writing some code at the ethernet layer,
    > mainly changing the if_ethersubr.c for my work.
    >
    > I am not using any FP instructions in my code.
    > But while running, my kernel crashes and gives the following panic msg:
    > npx is the Floating point unit (fpu).
    >
    > ----------------------------------
    > npxintr: npxproc = 0 , currproc = 0, npx_exists = 1
    > panic: npxintr from nowhere
    > ---------------------------------
    > ...
    >
    > Has anybody ever got such message or they know the fix for it.
    > I was not able to trace the error...even using kernel debug corefiles.

    If you have a system newer than a 486SX, then npx interrupts shouldn't
    be used for anything except to probe that not using them works. It
    is barely possible that a bug in turning off npx interrupts after the
    probe results in one being delivered much later (there have been bugs
    in this area).

    If it was a real npx interrupt, then the address of the FP instruction
    that caused it should be in the FPU state in the kernel dump.

    Bruce
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  • Next message: Vaibhave Agarwal: "Re: npxintr from nowhere"

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