haswell slab corruption

Found by

perf_fuzzer

First Seen

4.8-rc1

Most recently Seen

4.8-rc1

Reproducible

???

Type

slab corruption

Found On

Haswell

Linux-kernel Mailing List Report

9 August 2016: Re: perf: WARNING: kernel/events/core.c:4893 perf_mmap_close

Kernel Splat

  1. Could be because I was swapping DIMMs around while doing RAPL DRAM validation. However it could also be a decrement-after-free bug. 
    [ 6501.254564] Slab corruption (Tainted: G        W      ): task_struct start=ffff8800c072e000, len=5760
[ 6501.264971] 010: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  jkkkkkkkkkkkkkkk
[ 6501.273650] Single bit error detected. Probably bad RAM.
[ 6501.279889] Run memtest86+ or a similar memory test tool.

  2. [19535.776930] Slab corruption (Tainted: G        W      ): task_struct start=ffff8800c720e2c0, len=5760
[19535.787191] 010: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  jkkkkkkkkkkkkkkk
[19535.795771] Single bit error detected. Probably bad RAM.
[19535.801872] Run memtest86+ or a similar memory test tool.
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