Firebird embeded server crashes
--------------------------------
Key: CORE-4500
URL: http://tracker.firebirdsql.org/browse/CORE-4500
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.3, 2.5.2 Update 1, 2.5.2
Environment: OS: Windows Server 2012
Firebird: embeded server V2.5.1.26351
Crashed Application: [My C# Windows Service App (.exe) for .NET 4.0] =>
[.NET Data Provider (.dll)] => [Firebird Embeded Server (.dll)]
Reporter: Y. Numai
Priority: Critical
My C# Windows Service Application uses .NET Data Provider and FB Embeded server
(fbembed.dll).
However, it sometimes crashes when it connects to a firebird database file.
===EventLog(Application) EID 1026===
Exception: System.AccessViolationException
Stack:
at FB_1236665269_Class.isc_attach_database(IntPtr[], Int16, Byte[], Int32
ByRef, Int16, Byte[])
at FB_1236665269_Class.isc_attach_database(IntPtr[], Int16, Byte[], Int32
ByRef, Int16, Byte[])
at
FirebirdSql.Data.Client.Native.FesDatabase.Attach(FirebirdSql.Data.Common.DatabaseParameterBuffer,
System.String, Int32, System.String)
at FirebirdSql.Data.FirebirdClient.FbConnectionInternal.Connect()
at FirebirdSql.Data.FirebirdClient.FbConnectionPool.Create()
at FirebirdSql.Data.FirebirdClient.FbConnectionPool.CheckOut()
at FirebirdSql.Data.FirebirdClient.FbConnection.Open()
...
====================================
===EventLog(Application) EID 1000===
Faulting application name: MyApp.exe, version: 1.0.1.0, time stamp: 0x52eb5d90
Faulting module name: fbembed.DLL, version: 2.5.1.26351, time stamp: 0x4e89609d
Exception code: 0xc0000005
Fault offset: 0x000000000027963b
Faulting process id: 0x450
Faulting application start time: 0x01cf7f979c1b46a3
Faulting application path: C:\Program Files\MyApp\MyApp.exe
Faulting module path: C:\Program Files\MyApp\fbembed.DLL
...
====================================
When my app crashed, it created firebird.log as below.
====firebird.log=====
ServerName Fri Jun 20 23:51:31 2014
Fatal lock manager error: ISC_map_file failed (reattach shared file),
errno: 1224
=====================
I investigated my application crash dump file, and I finally found out that my
app has crashed at fwrite()
in the method "LockManager::bug()."
====ll.1651-1655 at Firebird-2.5.1.26351-0\src\lock\lock.cpp, ====
if (fd)
{
fwrite(m_header, 1, m_header->lhb_used, fd);
fclose(fd);
}
==================================================================
I have a hunch that if "LockManager::acquire_shmem()" failed to
"attach_shared_file" (l.1149 at lock.cpp), it calls "LockManager::bug()"
(l.1150 at lock.cpp).
"LockManager::bug()" referes "m_header->lhb_used" as it shows above.
However, if "LockManager::attach_shared_file()" fails, m_header will be NULL.
====ll.337-340 at Firebird-2.5.1.26351-0\src\lock\lock.cpp, ====
m_header = (lhb*) ISC_map_file(status, name.c_str(), initialize, this,
m_memorySize, &m_shmem);
if (!m_header)
return false;
==================================================================
Therefore, NULL-reference seems to occur at "fwrite(m_header, 1,
m_header->lhb_used, fd)."
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