Hi,
I know that there has been a number of crashes involving
journal_mode = off. This problem continues for me in
sqlite 3.6.10 almalgamation though. A trigger seems to
be the cause.
The following test program crashes on the last line
(sqlite3_step) with a NULL pointer dereference of
id->pMethods when compiled on Windows with VC2003.
sqlite.c line 12576
SQLITE_PRIVATE int sqlite3OsWrite(sqlite3_file *id, const void *pBuf, int amt,
i64 offset){
DO_OS_MALLOC_TEST;
return id->pMethods->xWrite(id, pBuf, amt, offset);
}
If the prop table and associated triggers are removed,
the crash doesn't occur.
Regards,
Brodie
The stack trace is:
> testsqlite.exe!sqlite3OsWrite(sqlite3_file * id=0x00510b58, const void
> * pBuf=0x0012e3e4, int amt=4, __int64 offset=0) Line 12576 + 0x1b C
testsqlite.exe!write32bits(sqlite3_file * fd=0x00510b58, __int64
offset=0, unsigned int val=4) Line 31128 + 0x17 C
testsqlite.exe!subjournalPage(PgHdr * pPg=0x00388a64) Line 33450 +
0x1b C
testsqlite.exe!pager_write(PgHdr * pPg=0x00388a64) Line 34311 + 0x9
C
testsqlite.exe!sqlite3PagerWrite(PgHdr * pDbPage=0x00388a64) Line
34420 + 0x9 C
testsqlite.exe!insertCell(MemPage * pPage=0x00388e88, int i=0, unsigned
char * pCell=0x00388f20, int sz=9, unsigned char * pTemp=0x00000000, unsigned
char nSkip=0) Line 40971 + 0xc C
testsqlite.exe!sqlite3BtreeInsert(BtCursor * pCur=0x00385760, const
void * pKey=0x0051d698, __int64 nKey=8, const void * pData=0x004f6c22, int
nData=0, int nZero=0, int appendBias=0) Line 42175 + 0x19 C
testsqlite.exe!sqlite3VdbeExec(Vdbe * p=0x00386808) Line 52819 + 0x2c
C
testsqlite.exe!sqlite3Step(Vdbe * p=0x00386808) Line 47849 + 0x9
C
testsqlite.exe!sqlite3_step(sqlite3_stmt * pStmt=0x00386808) Line
47916 + 0x9 C
testsqlite.exe!main(int argc=1, unsigned short * * argv=0x00381d88)
Line 48 + 0x9 C++
testsqlite.exe!mainCRTStartup() Line 259 + 0x19 C
kernel32.dll!7c817067()
ntdll.dll!7c915d27()
The test program is:
#include <windows.h>
#include <assert.h>
#include <io.h>
#include <stdio.h>
#include "sqlite3.h"
int main(int argc, TCHAR * argv[])
{
sqlite3 * pDatabase = NULL;
char * pszError = NULL;
sqlite3_stmt * pStatement = NULL;
unlink("test.sqlite");
unlink("test.sqlite-journal");
assert(SQLITE_OK == sqlite3_open_v2("test.sqlite",
&pDatabase, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL));
assert(SQLITE_OK == sqlite3_exec(pDatabase,
"CREATE TABLE dic ( entryid INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
headword TEXT NOT NULL, source TEXT NOT NULL ); "
"CREATE INDEX dic_headword_idx ON dic ( headword ); "
"CREATE TABLE prop ( pkey TEXT PRIMARY KEY NOT NULL, pval TEXT NOT NULL
); "
"INSERT INTO prop(pkey, pval) VALUES ('total_count', 0); "
"CREATE TRIGGER count_insert_trigger AFTER INSERT ON [dic] FOR EACH ROW
BEGIN"
" UPDATE prop SET pval = pval + 1 WHERE pkey = 'total_count'; "
"END; "
"CREATE TRIGGER count_delete_trigger AFTER DELETE ON [dic] FOR EACH ROW
BEGIN"
" UPDATE prop SET pval = pval - 1 WHERE pkey = 'total_count'; "
"END; ",
NULL, NULL, &pszError));
assert(SQLITE_OK == sqlite3_close(pDatabase));
assert(SQLITE_OK == sqlite3_open_v2("test.sqlite", &pDatabase,
SQLITE_OPEN_READWRITE, NULL));
assert(SQLITE_OK == sqlite3_exec(pDatabase,
"PRAGMA journal_mode = OFF; "
"BEGIN IMMEDIATE TRANSACTION; ",
NULL, NULL, &pszError));
assert(SQLITE_OK == sqlite3_prepare_v2(pDatabase,
"INSERT INTO dic (entryid, headword, source) VALUES (?, ?, ?);", -1,
&pStatement, NULL));
assert(SQLITE_OK == sqlite3_bind_null(pStatement, 1));
assert(SQLITE_OK == sqlite3_bind_text16(pStatement, 2, "foo", -1, NULL));
assert(SQLITE_OK == sqlite3_bind_text16(pStatement, 3, "bar", -1, NULL));
assert(SQLITE_DONE == sqlite3_step(pStatement)); // crash here
return 0;
}
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