[Bug 200288] Modify after Free: ZFS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200288

Peter Grehan <grehan at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |grehan at FreeBSD.org

--- Comment #27 from Peter Grehan <grehan at FreeBSD.org> ---
I can insta-repro this by running fio on a zvol with mixed r/w e.g.

fio --filename=/dev/zvol/xxxxxx --direct=1 --rw=rw --refill_buffers \
    --norandommap --randrepeat=0  --bs=8k \
    --rwmixread=70 --iodepth=8 --numjobs=24 --runtime=60 \
    --ioengine=pvsync \
     --group_reporting --name=crashtest

I can also confirm that reverting the condvar change stopped the crashes.

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