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It turns out that pagerExclusiveLock() can be called with the lock state

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already set to RESERVED if the SQLITE_FCNTL_PERSIST_WAL setting is set and
a specific sequence of multiple journal mode changes occur.
Enhance pagerExclusiveLock() to deal with this.
[forum:/forumpost/8130545bc6|Forum post 8130545bc6]

FossilOrigin-Name: 2bb8d977392f635515aa4a36f6f763a2e4858f7adc1120519e2e74c04a9749b5
This commit is contained in:
drh
2023-05-07 03:23:32 +00:00
parent 4e73863fd4
commit 28f32bedd1
4 changed files with 29 additions and 11 deletions
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6
src/pager.c
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@@ -7473,13 +7473,15 @@ int sqlite3PagerWalSupported(Pager *pPager){
*/
static int pagerExclusiveLock(Pager *pPager){
int rc; /* Return code */
u8 eOrigLock; /* Original lock */
assert( pPager->eLock==SHARED_LOCK || pPager->eLock==EXCLUSIVE_LOCK );
assert( pPager->eLock>=SHARED_LOCK );
eOrigLock = pPager->eLock;
rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
if( rc!=SQLITE_OK ){
/* If the attempt to grab the exclusive lock failed, release the
** pending lock that may have been obtained instead. */
pagerUnlockDb(pPager, SHARED_LOCK);
pagerUnlockDb(pPager, eOrigLock);
}
return rc;