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SubjectRe: [tip:perf/core] kprobes/x86: Call out into INT3 handler directly instead of using notifier
On 07/23/2013 08:55 PM, tip-bot for Jiri Kosina wrote:
> Commit-ID: 17f41571bb2c4a398785452ac2718a6c5d77180e
> Gitweb: http://git.kernel.org/tip/17f41571bb2c4a398785452ac2718a6c5d77180e
> Author: Jiri Kosina <jkosina@suse.cz>
> AuthorDate: Tue, 23 Jul 2013 10:09:28 +0200
> Committer: Ingo Molnar <mingo@kernel.org>
> CommitDate: Tue, 23 Jul 2013 10:12:57 +0200
>
> kprobes/x86: Call out into INT3 handler directly instead of using notifier
>
> In fd4363fff3d96 ("x86: Introduce int3 (breakpoint)-based
> instruction patching"), the mechanism that was introduced for
> notifying alternatives code from int3 exception handler that and
> exception occured was die_notifier.
>
> This is however problematic, as early code might be using jump
> labels even before the notifier registration has been performed,
> which will then lead to an oops due to unhandled exception. One
> of such occurences has been encountered by Fengguang:
>

Please note that putting this patch in perf/core means x86/jumplabel is
completely nonfunctional by itself.

-hpa




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