Severe performance impact when an antivirus scans AttachmentsIssue Description Multiple stuck '/sys_attachment.do' transactions on an instance in Orlando. These stuck transactions in turn exhaust default semaphores of the node causing performance issues. Cause If a attachment filename contains special characters or new line it causes the antivirus scanner to hang. If you see examples of sys_attachment filenames mentioned below with special characters then that could be the reason: ELS_drøftingsprotokoll_100820.pdfNSF-#1167957-v1-Feilmelding_nsftesting_service-now_com.docxFylkesmøte_for_NSF_Troms_og_Finnmark_30....Klientkontoavr�kning-36452-561-16-2020-0... How to verify the issue? With Antivirus scanning on: Try to download an attachment with no special characters. Download should be successful with no semaphore stuckTry to download an attachment with special characters. Download won't complete and you should see stuck '/sys_attachment.do' transaction Workaround Rename attachment filenames to not contain special characters and/or newlineTo release the stuck semaphores the node requires a restart, as threads cannot be killed from the UI Resolution The issue is fixed in Orlando Patch 8 in PRB1409981