On Tue, Jul 09, 2019 at 03:48:19PM +0200, Frederic Weisbecker wrote: > > Syzbot has found a breakpoint overcommit issue: > > https://lore.kernel.org/lkml/[email protected]/ > > It took me a long time to find out what the actual root problem was. Also > its reproducer only worked on a few month old kernel but it didn't feel like > the issue was actually solved. > > I eventually cooked a reproducer that works with latest upstream, see in > the end of this message. > > The fix is just a few liner but implies to shut down the context swapping > optimization for contexts containing breakpoints. > > Also I feel like uprobes may be concerned as well as it seems to make use > of event.hw->target after pmu::init().
Can't we simply swizzle event.hw->target along too?
