On Thu, 11 Jan 2018, Vince Weaver wrote: > On Thu, 11 Jan 2018, Peter Zijlstra wrote: > > > On Thu, Jan 11, 2018 at 01:21:12PM -0600, Josh Poimboeuf wrote: > > > Yuck. This time it was stack recursion on the entry stack. In the > > > previous error, recursion was detected on the IRQ stack. Otherwise they > > > look quite similar. > > > > > > Was that also with nopti? > > > > Both with pti enabled, nopti makes things work again. > > I think I have hit those errors even with pti disabled but now I'll have > to double check.
I can confirm this, I am able to trigger the stack recursion warning even when "pti=off" is set. Jan 11 15:34:47 core2 kernel: [ 320.668900] WARNING: stack recursion on stack type 4 Jan 11 15:34:47 core2 kernel: [ 320.668909] WARNING: can't dereference registers at 00000000d5ae0491 for ip swapgs_restore_regs_and_return_to_usermode+0x28/0x7c Vince
