On Dec 16, 2015 3:12 PM, "Jeff Merkey" <linux....@gmail.com> wrote: > > Setting a hardware breakpoint at the > > rex64 sysret > > instruction at the end of int_ret_from_sys_call causes the system to > triple fault > and reboot when the breakpoint is triggered. Appears to be related > the same problem > as the lockup. > > This function can be stepped over and traced through with the TRAP > FLAG set so long as a hardware breakpoint is set somewhere in the > function. Otherwise upon exist the system hard hangs. If you break > exactly on that instruction -- reboot. If you break a few > instructions before it and single step through the call it works. If > you step through the call with no breakpoint the system hard hangs. > Same behavior as when you try to step from inside an nmi handler. > Looks related.
You're probably encountering the user mode RSP when SYSRET happens. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
