SIGSEGV

I would like to understand why the next crash is happening.

Important: I cannot reproduce it. My unit tests are Ok, but after using the application for a while (hours or even days), the next crash happens again.

Logs are from Crashlytics:

Exception Type: SIGSEGV Code: SEGV_ACCERR at 0x2

Thread Crashed
5/26/2013 at 17:38:49 UTC-0300
0    libsqlite3.dylib    sqlite3_step + 42265
1       
2    libsqlite3.dylib    sqlite3_value_text + 2766
3    libsqlite3.dylib    sqlite3_step + 30818
4    libsqlite3.dylib    sqlite3_step + 2142
5    SampleIOS   wrapper_managed_to_native_SQLite3_Step_intptr
6    SampleIOS   System_Collections_Generic_List_1_AddEnumerable_System_Collections_Generic_IEnumerable_1_T
7    SampleIOS   System_Collections_Generic_List_1__ctor_System_Collections_Generic_IEnumerable_1_T
8    SampleIOS   System_Linq_Enumerable_ToList_TSource_System_Collections_Generic_IEnumerable_1_TSource
9    SampleIOS   SQLiteCommand_ExecuteQuery_T

And here is the code which is generating the exception:

IEnumerable<Message> results = database.ExecuteQueryWithLambda<Message> (
() =>
from message in database.Table<Message> ()
where (
message.ConversationID == conversationID && 
message.UserAccountID == userAccountID &&
message.SentDate != null &&
message.DeliveredToRecipientDate != null
)
select message)
.OrderByDescending (message => message.SentDate)
    .Take<Message> (1)
    .ToList<Message> ();

public IEnumerable<T> ExecuteQueryWithLambda<T> (Func<IEnumerable<T>> query) where T : new ()
{
    lock (locker) {
        try {
            return query.Invoke ();
        } catch (Exception ex) {
            //
            // Log
            Logger.Log ("SQLiteDatabase 'ExecuteQueryWithLambda' caught an Exception: {0}", ex);
            return new List<T> ();
        }
    }
}

Note: I have just tried to catch the exception but the app still crashing before the catch block gets called.

I would appreciate for any help. I cannot understand what is the real problem. Is there something wrong with my ExecuteQueryWithLambda method implementation?

I am using:

• A Mac;
• Xamarin Studio;
• Xamarin.iOS;

Thanks.

[praeclarum]

I’m closing this since it looks like you got an answer.

[patrikahlenius]

Hi, Yes, you need to call sqllite_shutdown() and then set to serialized mode, followed by initalize(), see my pull request https://github.com/praeclarum/sqlite-net/pull/220