Hi,
I am consistently observing this error in Linux envrionment.
I have sqlite3 library linked with my DLL. The program links/loads my DLL as
well as a second DLL which includes the code to open and close db connections.
Wondering what can be wrong.
Below is description:
sqlite3 *db;
1) I open a db connection by sqlite3_open("db-name", &db);
2) I query a row from database by using sqlite3_exec( ).
3) The row data is processed in the callback function called by sqlite3_exec().
I pass a pointer to the callback function and allocate several chunks of
memory using calloc.
4) Then I try to close the db connection by calling sqlite3_close(). During
the close operation I get General Protection Error and the rsp is pointing to
the address near the db handle.
Below is trace log:
NOTE: sqlite3 *db = NULL;
Before calling sqlite3_open():
db = (nil), &db = 0x7fffa7e02438
After calling sqlite3_open("db-name", &db):
db = 0x672f10, &db = 0x7fffa7e02438
n = sqlite3_exec(db, "select * from table-name;", callback_mem, ptr, &db_err);
if (n != SQLITE_OK) {
return ERROR; }
The sqlite3_exec doesn't fail and the callback function "callback_mem()" is
called with the value of ptr.
As there is ONLY one row, callback_mem( ) is called ONLY once.
In the callback_mem( ) I allocated several chunks of memory in the structure
pointed to by *ptr.
After completing the sqlite3_exec (), before calling sqlite3_close():
db = 0x672f10, &db = 0x7fffa7e02438
sqlite3_close(db);
general protection rip:2ad90420a7ed rsp:7fffa7e022e0 error:0
[1]+ Segmentation fault /usr/bin/aim_cp_main.bin
bash-3.00#
NOTE: the value of rsp.
Also, I must mention that if I call a different callback function which doesn't
do many calloc() etc. I don't see this error.
Any pointer and/or ideas will be very helpful.
Sincerely,
Zaryab
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