On 1/19/21 1:40 PM, Martin Simmons wrote:
> In theory jobs running without batch insert share a single BDB object in
> memory, but it is used with a lock by a per-job thread (which is why the db
> library has to be thread-safe). See setup_job().
>
> I say "in theory" because it looks like Bacula 9.6.4 broke this!
Aaaaaaah! *THAT* would explain a lot. 9.6.4 is *EXACTLY* when I began
seeing problems.
> What is the output of "show catalog" in bconsole? My guess is that you will
> see db_driver=MySQ i.e. missing the final "L" of MySQL. This will prevent it
> from reusing the BDB object, leading to unexpected concurrency.
You are precisely correct.
*show catalog
Catalog: name=Catalog address=10.24.32.15 DBport=3306 db_name=bacula
db_driver=MySQ db_user=bacula MutliDBConn=0
You have messages.
>
> The bug is caused by this change:
>
> diff --git a/bacula/src/dird/dird.c b/bacula/src/dird/dird.c
> index fdb1d97bf9..11c4406ea7 100644
> --- a/bacula/src/dird/dird.c
> +++ b/bacula/src/dird/dird.c
> @@ -1265,7 +1265,7 @@ static bool check_catalog(cat_op mode)
> /* To copy dbdriver field into "CAT" catalog resource class
> (local)
> * from dbdriver in "BDB" catalog DB Interface class (global)
> */
> - strncpy(catalog->db_driver, BDB_db_driver, db_driver_len);
> + bstrncpy(catalog->db_driver, BDB_db_driver, db_driver_len);
> }
> }
>
> which was part of 9.6.4.
>
> To fix it, replace db_driver_len with db_driver_len+1 in this call to
> bstrncpy. This has been fixed in Bacula 11 because the seemingly minor
> problem with "status catalog" was reported in
> https://bugs.bacula.org/view.php?id=2551 but it looks like the significance of
> it wasn't realized.
Thank you for tracking this down. I would not have found that, I don't
understand the code well enough.
--
Phil Stracchino
Babylon Communications
ph...@caerllewys.net
p...@co.ordinate.org
Landline: +1.603.293.8485
Mobile: +1.603.998.6958
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