On Wed, Aug 19, 2020 at 10:46:36PM -0500, Josh Poimboeuf wrote: > On Wed, Aug 19, 2020 at 05:14:18PM -0700, Andy Lutomirski wrote:
> > I'm pretty sure you have the buggy sequence of events right, but for > > the wrong reason. There's nothing wrong with scheduling when > > delivering SIGTRAP, but it's definitely wrong to blindly save and > > restore DR7 around scheduling and around ptrace invocations. Remember > > this is an entry from user mode, so it runs on the user stack. *groan*, yeah that's broken :/ > Wow, I had no idea user #DB's run on the task stack. The scheduling > from #DB blew my mind :-) What's the purpose of that? At the very least that vm86 junk needs to I think. Also -RT needs it to send signals.
