I tracked down a occasional system crash problem of calling "PRAGMA journal_mode" and found that walIndexRecover()->walIndexAppend() is finally called before the crash according to my callstack.
In sqlite3.c, walIndexAppend() can be called after walIndexRecover() only when nSize, the size of WAL-file, is bigger than WAL_HDRSIZE. But I do not think this could happen when I call "PRAGMA journal_mode" as the DB connection is first open at that time. I am not familiar with the operations of upper APPs and this crash makes me confuse. I guess there may be two threads access the same db at the same time and both of threads find the journal_mode is DELETE and then call PRAGMA. The crash may happen when the second PRAGMA executes as the first thread may have written something into the db. Is it possible? Or, in what other situation could this crash happen? Thanks a lot. -- Sent from: http://sqlite.1065341.n5.nabble.com/ _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
