Internal Quartus Error

[Altera_Forum]

Hello, 

 I am running Quartus II v13.1, and every so often (maybe 40% of the time) I get an internal error while compiling. If I restart the compilation it typically goes fine the second time through. I've posted the error message below, but I can't really make heads or tails of it. Can anyone help me understand what's going on and if it's a Quartus error or a system error on my machine?  Internal Error: Sub-system: HDB, File: /quartus/h/qtl_object_cache_sys.h, Line: 1042 m_locks == 0 Stack Trace:  0x7e280: HDB_ENUM_OPTION::get_value + 0x10b80   0x48257: HDB_ACTION_PT_INSTANCE::find_design_unit + 0x8b7   0x47f79: HDB_ACTION_PT_INSTANCE::find_design_unit + 0x5d9   0x4b8cb: HDB_CMP_ACTION_PT_INSTANCE::write_pdb + 0x1ab   0x45fa5: HDB_FILE_DEPENDENCIES::operator<< + 0x185   0x3681: PDB_BASE_SEGMENT::xfr + 0x431   0x45456: HDB_ACTION_PT_INSTANCE::operator<< + 0x256   0x4ea5b: HDB_CMP_ACTION_PT_INSTANCE::operator<< + 0x4b   0x529b: pdb_write_ptr + 0xfb   0x59e47: HDB_PARAMETER::get_option + 0x77   0x4a744: hdb_get_acf_section_type + 0x2e4   0x4b762: HDB_CMP_ACTION_PT_INSTANCE::write_pdb + 0x42   0x4802: QCU_ACF_SETTING::operator= + 0x2352   0x9d90: QCU_FRAMEWORK::write_named_databases + 0x1f0   0x1a89: Legacy_fitter_Init + 0xa19   0x21ac: Legacy_fitter_Init + 0x113c   0xf8a6: TclInvokeStringCommand + 0xc6   0x112a8: TclEvalObjvInternal + 0x328   0x121b5: TclEvalEx + 0x8d5   0x12d48: TclEvalObjEx + 0x2d8   0x1abbd: Tcl_EvalObjCmd + 0xfd   0x112a8: TclEvalObjvInternal + 0x328   0x56917: TclExecuteByteCode + 0xe47   0xa2376: TclObjInterpProcCore + 0x76   0x112a8: TclEvalObjvInternal + 0x328   0x56917: TclExecuteByteCode + 0xe47   0xa2376: TclObjInterpProcCore + 0x76   0x112a8: TclEvalObjvInternal + 0x328   0x121b5: TclEvalEx + 0x8d5   0x7c117: Tcl_FSEvalFileEx + 0x1d7   0x7a626: Tcl_EvalFile + 0x36   0xc1ff: qexe_ipc_progress_bar_name + 0x12bf   0x11dd6: qexe_get_command_line + 0x1556   0x150d5: qexe_run_tcl_option + 0x585   0x1e03d: qcu_run_tcl_option + 0xb8d   0x156ed: qexe_process_cmdline_arguments + 0x54d   0x15851: qexe_standard_main + 0xa1     0xa7f8: msg_exe_fini + 0x58   0xaf3c: msg_exe_fini + 0x79c   0x1f14: MEM_SEGMENT_INTERNAL::~MEM_SEGMENT_INTERNAL + 0x194   0xb8bf: msg_exe_main + 0x8f     0x1841: BaseThreadInitThunk + 0x19   0x57508: RtlUserThreadStart + 0x20    End-trace   Quartus II 64-Bit Version 13.1.0 Build 162 10/23/2013 SJ Full Version  Thanks!

[Altera_Forum]

I don't think there's anything to 'make' of the error you've posted, other than to say Quartus isn't happy with something. 

 Given the version you're using is pretty stable all I can suggest is that you reinstall it. I've seen similar errors with earlier versions. However, I've used 64-bit 13.1 162 for a long time and don't recall ever seeing it fail in this way.  You don't say what it is you're compiling. Can it handle very simple projects? Or is it that it doesn't like a particular bit of IP you're using?  Cheers, Alex