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    SubjectRe: [patch] preempt-trace.patch (mono preempt-trace)
    Date
    On Friday 05 August 2005 20:46, Hugh Dickins wrote:
    > On Fri, 5 Aug 2005, Dominik Karall wrote:
    > > On Friday 05 August 2005 17:22, Ingo Molnar wrote:
    > > > please enable CONFIG_FRAME_POINTERS!
    > >
    > > I'm sorry, but I think I can't enable CONFIG_FRAME_POINTERS.
    > > Depends on: DEBUG_KERNEL && (X86 && !X86_64 || CRIS || M68K || M68KNOMMU
    > > || FRV || UML)
    > >
    > > Seems to be disabled for x86_64.
    >
    > It is disabled for x86_64, but not for any very good reason (beyond
    > reducing the test matrix). I work with CONFIG_FRAME_POINTERS on x86_64
    > with no trouble, just add in the patch below, make oldconfig, choose
    > frame pointers and rebuild). But I can't guarantee it'll actually
    > reveal the info Ingo and all are longing to see.

    With FRAME_POINTERS enabled:

    BUG: mono[3193] exited with nonzero preempt_count 1!
    ---------------------------
    | preempt count: 00000001 ]
    | 1 level deep critical section nesting:
    ----------------------------------------
    .. [<ffffffff80400a46>] .... _spin_lock+0x16/0x80
    .....[<ffffffff801ed30c>] .. ( <= sys_semtimedop+0x28c/0x7c0)

    hth, let me know!

    dominik
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