[FB-Tracker] Created: (CORE-2726) Error in TRA_detach_request

Error in TRA_detach_request
---------------------------

                 Key: CORE-2726
                 URL: http://tracker.firebirdsql.org/browse/CORE-2726
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 2.0.5
         Environment: WinXP SP3 32-bit
            Reporter: Dmitry Alexeev


I got a stable Access violation in PDB-build, when executing some ddl-script over one of our db.
in function
  TRA_detach_request
at line
  request->req_tra_next->req_tra_prev = request->req_tra_prev;
debugger stopped at
  004414F8  mov         dword ptr [ecx+1Ch],esi

Call stack
  fbserver.exe!TRA_detach_request(Jrd::jrd_req * request=0x032566b0)  Строка 166 + 0x3 байт C++
> fbserver.exe!TRA_release_transaction(Jrd::thread_db * tdbb=0x017ff820, Jrd::jrd_tra * transaction=0x0339ccc8)  Строка 1086 + 0xc байт C++
  fbserver.exe!TRA_commit(Jrd::thread_db * tdbb=0x017ff820, Jrd::jrd_tra * transaction=0x0339ccc8, const bool retaining_flag=false)  Строка 486 C++
  fbserver.exe!commit(long * user_status=0x017ff940, Jrd::jrd_tra * * tra_handle=0x0180ec58, const bool retaining_flag=false)  Строка 4896 C++
  fbserver.exe!jrd8_commit_transaction(long * user_status=0x017ff940, Jrd::jrd_tra * * tra_handle=0x0180ec58)  Строка 1632 + 0x21 байт C++
  fbserver.exe!isc_commit_transaction(long * user_status=0x017ff940, void * * tra_handle=0x00bc7560)  Строка 1368 + 0x17 байт C++
  fbserver.exe!rem_port::end_transaction(P_OP operation=op_commit, p_rlse * release=0x017ffb60, packet * sendL=0x017ffcbc)  Строка 1788 C++
  fbserver.exe!process_packet(rem_port * port=0x0180ff08, packet * sendL=0x017ffcbc, packet * receive=0x017ffa3c, rem_port * * result=0x00000000)  Строка 3251 C++
  fbserver.exe!SRVR_main(rem_port * main_port=0x0180ff08, unsigned short flags=120)  Строка 269 + 0x15 байт C++
  fbserver.exe!service_connection(rem_port * port=0x00000000)  Строка 501 + 0x11 байт C++
  fbserver.exe!process_connection_thread(void * arg=0x0180ff08)  Строка 358 C++
  fbserver.exe!ThreadPriorityScheduler::run()  Строка 148 + 0x6 байт C++
  fbserver.exe!`anonymous namespace'::threadStart(void * arg=0x00bc880c)  Строка 242 C++
  msvcr71.dll!_threadstartex(void * ptd=0x003e4ff0)  Строка 241 + 0x6 байт C
  kernel32.dll!7c80b729()




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