On Sat, 20 Jul 2019, Thomas Gleixner wrote: > On Sat, 20 Jul 2019, Thomas Gleixner wrote: > > On Fri, 19 Jul 2019, Sean Christopherson wrote: > > > [ 0.680477] Run /sbin/init as init process > > > [ 0.682116] init[1]: segfault at 2926a7ef ip 00007f98a49d9c30 sp > > > 00007fffd83e6af0 error 14 in ld-2.23.so[7f98a49d9000+26000] > > > > That's because the call into the context tracking muck clobbers RDX which > > contains the CR2 value on pagefault. So the pagefault resolves to crap and > > kills init. > > > > Brute force fix below. That needs to be conditional on read_cr2 but for now > > it does the job. > > But it does it just for the context tracking case. TRACE_IRQS_OFF* will do > the same damage.
Hmm, should not becasue that calls through the thunk which preserves RDX.
