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Re: [PATCH v3 perf/core] perf script: fix a use after free crash.

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  Re: [PATCH v3 perf/core] perf script: fix a use after free crash. Krister Johansen <kjlx@templeofstupid.com> - 2017-01-21 02:50 +0100

#1564039 — Re: [PATCH v3 perf/core] perf script: fix a use after free crash.

Hey Arnaldo,

On Thu, Jan 05, 2017 at 10:23:31PM -0800, Krister Johansen wrote:
> If dso__load_kcore frees all of the existing maps, but one has already
> been attached to a callchain cursor node, then we can get a SIGSEGV in
> any function that happens to try to use this invalid cursor.  Use the
> existing map refcount mechanism to forestall cleanup of a map until the
> cursor iterates past the node.

It's been a couple of weeks since I sent you the v3 of this patch.  Last
time I fiddled with it, I was able to reproduce your 'perf top' core,
and was able to verify that the latest patch I sent out could survive
running 'perf top' through the course of a full kernel build.

Is there anything else I can do to help with this one?

Thanks,

-K

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