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    SubjectRe: [Bug 10489] Kprobe smoke test lockdep warning
    Thank you for reporting.

    Actually, kprobes tries to fixup thread's flags in post_kprobe_handler
    (which is called from kprobe_exceptions_notify) by
    trace_hardirqs_fixup_flags(pt_regs->flags). However, even the irq flag
    is set in pt_regs->flags, true hardirq is still off until returning
    from do_debug. Thus, lockdep assumes that hardirq is off without annotation.

    IMHO, one possible solution is that fixing hardirq flags right after
    notify_die in do_debug instead of in post_kprobe_handler.

    Thanks,


    --
    Masami Hiramatsu

    Software Engineer
    Hitachi Computer Products (America) Inc.
    Software Solutions Division

    e-mail: mhiramat@redhat.com



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