Db_Vista -901

[David Garcia]

Greetings,

This is the first time I’ve encountered a -901 error. Can anyone shed some light on this particular error? It looks as if a thread pstart command triggered the panic:

Quote:

[cmd :cmd :INFO/0: abstract_cmd] Received command: ‘group_out1_file pstart’

[cmd :cmd :INFO/0: abstract_cmd] Doing ‘pstart’ command on ‘group_out1_file’

11/19/2005 22:33:12

[dbi :dbi :ERR /0:group_out1_file] Db_Vista database error -901: ‘INTERNAL error: -901

system error

C errno = 0: No error’

11/19/2005 22:33:12

[pti :sign:WARN/0:group_out1_file] Thread 8 received signal EXCEPTION_ACCESS_VIOLATION:

 The thread attempted to read from or write to a virtual address for which it does not have the appropriate access.

We were able to restart the process without a reboot or re-initialization of the databases.

Cloverleaf 5.3 Rev2 on Windows 2000

Thanks!

Topic

[Anonymous]

If I’m right, this is one of those semaphore errors. Check the logs of the monitord to see if there is more info there.

[David Garcia]

I had an inquiry on this error from another Clovertecher so I thought I’d post a follow-up…

The EXCEPTION_ACCESS_VIOLATION occurred several times but only presented the -901 once that I know of.

We brought up a new set of interfaces that included some Tcl code to start and stop threads. A panic would sometimes happen when a pstop or pstart command was issued. My best guess is that stopping and starting threads frequently causes a memory leak in Windows and eventually results in a panic.

The workaround was to set up a .cmd file to bounce the process twice a week. We haven’t had a panic in three weeks but I still have the engine output turned up just in case.

David

[Author]

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