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Has anyone ever seen anything like this? It happens intermittently on one of my servers running Apache2 with Xcache and PHP 5.3.3.

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I can't be sure, but it appears suspiciously like someone trying to use a buffer overflow to call a specific system function at address 0x0f8af990. See this link for example.

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That link is dead. – Lekensteyn Jun 14 '14 at 14:55

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