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Key: CORE-3535
Type: Bug Bug
Status: Closed Closed
Resolution: Fixed
Priority: Major Major
Assignee: Vlad Khorsun
Reporter: Vlad Khorsun
Votes: 0
Watchers: 0
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Firebird Core

Write target of dirty page could be undefined if error happens when nbackup state is changed

Created: 24/Jun/11 08:34 AM   Updated: 23/Apr/13 01:02 PM
Component/s: Engine
Affects Version/s: 2.5.0
Fix Version/s: 2.5.1, 3.0 Alpha 1

Time Tracking:
Not Specified

Planning Status: Unspecified


 Description  « Hide
The bug show itself in DEBUG build - assertion failed at cch.cpp\write_page() near line 5022 :

// write out page to main database file, and to any
// shadows, making a special case of the header page
BackupManager* bm = dbb->dbb_backup_manager;
const int backup_state = bm->getState();

if (bdb->bdb_page.getPageNum() >= 0)
{
fb_assert(backup_state != nbak_state_unknown); <------- HERE
page->pag_pageno = bdb->bdb_page.getPageNum();

When exception happens in BackupManager::endBackup() method than destructor
BackupManager::StateWriteGuard::~StateWriteGuard() released the state lock *before*
backup state is set into nbak_state_unknown. In this small time window it is possible
that another thread fetched and modified some page.


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