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php_session_regenerate_id() opened the handler with s_open() and then threw when s_create_sid() returned no id, leaving mod_data open until request shutdown and double-opening it on the next session start. The collision-retry failure path in the same function already closes the handler; do the same on the null-id path.
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php_session_regenerate_id() opens the save handler with s_open() and then throws when s_create_sid() returns no id, leaving mod_data open until request shutdown and double-opening it on the next session start. The collision-retry failure path a few lines up in the same function already closes the handler; this does the same on the null-id path.