Messages in this thread | | | From | "Yu, Fenghua" <> | Subject | RE: Oops with tip/x86/fpu | Date | Thu, 26 Mar 2015 22:37:03 +0000 |
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> 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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