Re: Debug: sleeping function called from invalid context

From: Andrew Morton (akpm_at_osdl.org)
Date: 08/19/03

  • Next message: Fredrick Knieper: "pdc-ultra promise 150tx2+ driver bug? hard lock/other crashiness" 
    Date:	Mon, 18 Aug 2003 20:35:13 -0700
To: "Randy.Dunlap" <rddunlap@osdl.org>

    "Randy.Dunlap" <rddunlap@osdl.org> wrote:
    >
    > Debug: sleeping function called with interrupts disabled at
    > include/asm/uaccess.h:473

    OK, now my vague understanding of what's going on is that the app has
    chosen to disable local interupts (via iopl()) and has taken a vm86 trap.
    I guess we'd see the same thing if the app performed some sleeping syscall
    while interrupts are disabled.

    If that is correct then it really is just a false positive.

    It could also point at a bug in the application; it is presumably disabling
    interrupts for some form of locking, atomicity or timing guarantee. But it
    will not lock against other CPUs and the fact that it trapped into the
    kernel indicates tat it may not be getting the atomicity which it desires.

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