Messages in this thread | | | Date | Thu, 1 Oct 2020 16:06:53 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH] perf evlist: fix memory corruption for Kernel PMU event |
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On Fri, Oct 02, 2020 at 12:57:29AM +1300, Barry Song wrote: > Commit 7736627b865d ("perf stat: Use affinity for closing file > descriptors") will use FD(evsel, cpu, thread) to read and write > file descriptors xyarray. For a kernel PMU event, this leads to > serious memory corruption and perf crash. > I have seen evlist->core.cpus->nr is 1 while evsel has cpus->nr > with the total number of CPUs. so xyarray which is allocated by > evlist->core.cpus->nr will get overflow. This leads to various > segmentation faults in perf tool for kernel PMU events, eg: > ./perf stat -e bus_cycles sleep 1 > *** Error in `./perf': free(): invalid next size (fast): 0x00000000401e6370 *** > Aborted (core dumped)
Thanks.
I believe there is already a patch queued for this.
The problem seems to only happen on ARM64.
-Andi
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