XCON: Err Msg: Suspected Deadlock (152947)
The information in this article applies to:
- Microsoft Exchange Server 4.0
This article was previously published under Q152947 SYMPTOMS
The Microsoft Exchange Message Transfer Agent (MTA) is still alive but it
fails to handle any additional incoming or outgoing messages via the
Microsoft Exchange X.400 TCP/IP Connector. Several 9405 Event IDs appear in
the Windows NT Event Log:
Error: suspected deadlock BASE KERNEL 29 (16) and MAIN BASE 1 (16)
CAUSE
The OPVRECON semaphore and the Kernel Control Block (CB) KPSEMID semaphore
are acquired in a different order by two threads, causing a deadlock. This
occurs when a message for an previously freed CB is sent into Platform, due
to a close race condition, while the root thread is trying to acquire the
same CB for a new connection.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 4.0. This problem was corrected in the latest Microsoft Exchange
Service Pack. For information on obtaining the Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):
| Modification Type: | Minor | Last Reviewed: | 4/28/2005 |
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| Keywords: | kbusage KB152947 |
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