SuperServer could hung on database shutdown
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Key: CORE-4952
URL: http://tracker.firebirdsql.org/browse/CORE-4952
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0 Beta 2
Environment: SuperServer only
Reporter: Vlad Khorsun
Internal deadlock could happen when database is shutting down.
1. Shutdown thread
00 ntdll!KiFastSystemCallRet
01 kernel32!WaitForSingleObject+0x12
02 engine12!Firebird::Semaphore::tryEnter+0x20
03 engine12!CCH_shutdown+0x169
04 engine12!JRD_shutdown_database+0x571
engine12!Firebird::IProviderBaseImpl<Jrd::JProvider,Firebird::CheckStatusWrapper,Firebird::IPluginBaseImpl<Jrd::JProvider,Firebird::CheckStatusWrapper,Firebird::Inherit<Firebird::IReferenceCountedImpl<Jrd::JProvider,Firebird::
CCH_shutdown owns bcb->bcb_syncObject and waits for bcb->bcb_writer_sem
semaphor (signalling that cache_writer thread is gone)
2. cache_writer thread
00 ntdll!KiFastSystemCallRet
01 kernel32!WaitForSingleObject+0x12
02 engine12!Firebird::Synchronize::sleep+0x16
03 engine12!Firebird::Synchronize::sleep+0xe
04 engine12!Firebird::SyncObject::wait+0xbb
05 engine12!Firebird::SyncObject::lock+0xab
06 engine12!get_buffer+0x1ba
07 engine12!cache_writer+0x2a8
cache_writer waits for bcb->bcb_syncObject forever
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