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From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 201259] [xfstests shared/010]: maybe pagecache contents is
 mutated after cycle mount
Date: Tue, 02 Oct 2018 16:37:14 +0000
Message-ID: <bug-201259-201763-SMSx0idCb1@https.bugzilla.kernel.org/>
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References: <bug-201259-201763@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=201259

--- Comment #5 from Eric Sandeen (sandeen@sandeen.net) ---
Even simpler, 

xfs_io -f -c "pwrite -S 0x72 0 4096" $DONOR1

xfs_io -f \
        -c "falloc -k 8192 4096"        \
        -c "pwrite -S 0x57 65536 8192" \
        -c "fdatasync" \
        -c "reflink $DONOR1 0 131072 4096" \
                $TARGET

so this seems to be an extending reflink extending past/into speculative
preallocation which exposes the stale blocks.

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