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Date: Wed, 10 Jul 2019 16:04:21 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Frederic Weisbecker <frederic@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Namhyung Kim <namhyung@...nel.org>, Dmitry Vyukov <dvyukov@...gle.com>, Borislav Petkov <bp@...e.de>, syzbot+370a6b0f11867bf13515@...kaller.appspotmail.com, Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com> Subject: Re: [PATCH 0/2] perf/hw_breakpoint: Fix breakpoint overcommit issue 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/000000000000639f6a0584d11b82@google.com/ > > 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?
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