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    SubjectRe: PowerPC: Sleeping function called from invalid context at emulate_instruction()
    Date

    On Feb 22, 2006, at 2:29 PM, Michael Buesch wrote:

    > Hi,
    >
    > On a powerPC 32bit, I got the following debugging assertion failure:
    >
    > [ 733.209827] Debug: sleeping function called from invalid context
    > at arch/powerpc/kernel/traps.c:697
    > [ 733.210682] in_atomic():0, irqs_disabled():1
    > [ 733.211347] Call Trace:
    > [ 733.211969] [D6023EB0] [C0007F84] show_stack+0x58/0x174
    > (unreliable)
    > [ 733.212765] [D6023EE0] [C0022C34] __might_sleep+0xbc/0xd0
    > [ 733.213523] [D6023EF0] [C000D158] program_check_exception
    > +0x1d8/0x4fc
    > [ 733.214309] [D6023F40] [C000E744] ret_from_except_full+0x0/0x4c
    > [ 733.215076] --- Exception: 700 at 0x102a7100
    > [ 733.215785] LR = 0xdb9ef04
    >
    > It is caused by the line
    > if (get_user(instword, (u32 __user *)(regs->nip)))
    > in arch/powerpc/kernel/traps.c:emulate_instruction()
    >
    > I am not sure, if this is an indication for a bug, or just false
    > alarm.
    > In case of false alarm, the debugging message should be made quiet
    > somehow, though.

    Paul,

    Last time this was brought up we left it wondering why you had made
    program_check_exception() run with interrupts disabled. Any further
    ideas on that one?

    - kumar
    -
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