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    SubjectRE: Oops with tip/x86/fpu
    Date
    > From: Oleg Nesterov [mailto:oleg@redhat.com]
    > Sent: Thursday, March 05, 2015 10:22 AM
    >
    > On 03/05, Oleg Nesterov wrote:
    > >
    >
    > Does it trigger something else on your machine?
    >
    > Oleg.
    >
    > #include <stdio.h>
    > #include <signal.h>
    > #include <unistd.h>
    > #include <ucontext.h>
    >
    > void sighup(int sig, siginfo_t *info, void *ctxt) {
    > struct ucontext *uctxt = ctxt;
    > struct sigcontext *sctxt = (void*)&uctxt->uc_mcontext;
    >
    > printf("SIGHUP! %p\n", sctxt->fpstate);
    > sctxt->fpstate = (void *)1;

    sctxt->fpstate=(void *)1 changes the fpstate pointer in the sigcontext. It will generate segfault and bad frame info in kernel.

    This is expected behavior, right? Is this still a valid test?

    Thanks.

    -Fenghua


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