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[ Upstream commitd0206db94b] Kernel maps are encoded in PERF_RECORD_MMAP2 samples but "perf lock report" and "perf lock contention" do not process MMAP2 samples. Because of that, machine->vmlinux_map stays NULL and any later access triggers a segmentation fault. Fix it by adding ->mmap2() callbacks. Fixes:53b00ff358("perf record: Make --buildid-mmap the default") Reported-by: Tycho Andersen (AMD) <tycho@kernel.org> Reviewed-by: Ian Rogers <irogers@google.com> Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com> Tested-by: Tycho Andersen (AMD) <tycho@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ananth Narayan <ananth.narayan@amd.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Santosh Shukla <santosh.shukla@amd.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.