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| author | Alain Mazy <am@orthanc.team> |
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| date | Wed, 23 Oct 2024 16:52:30 +0200 |
| parents | b7835da59750 |
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| rev | line source |
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| 244 | 1 .. _debugging: |
| 2 | |
| 3 Debugging Orthanc | |
| 4 ================= | |
| 5 | |
| 6 If you experience an error within Orthanc (or one of its plugins), that | |
| 7 the troubleshooting sections (cf. :ref:`here <troubleshooting>` and | |
| 8 :ref:`here <dicom>`) do not help, and that you can't provide a robust | |
| 9 way to reproduce your issue by third-party developers, you'll have to | |
| 10 analyze the backtrace of Orthanc. | |
| 11 | |
| 12 If you observe a **fatal crash** of Orthanc, where Orthanc stops | |
| 13 abruptly (e.g. by creating a so-called "core dumped" or reporting an | |
| 14 invalid memory access), which rarely occurs, please check the | |
| 15 :ref:`dedicated section <crash>`). The present FAQ entry is rather | |
| 16 about C++ exceptions that are thrown by Orthanc, typically as a | |
| 17 consequence of invalid inputs, and that result in an error message | |
| 18 reported by Orthanc (not in a crash), and for which the :ref:`log | |
| 19 files in verbose mode <log>` do not provide meaningful information. | |
| 20 | |
| 21 **Important reminder:** Most issues with Orthanc can be solved by | |
| 541 | 22 carefully looking at the :ref:`Orthanc logs <log>` after starting |
| 23 Orthanc with the ``--verbose --trace-dicom`` command-line options! | |
| 244 | 24 |
| 25 | |
| 26 Any system | |
| 27 ---------- | |
| 28 | |
| 29 First :ref:`compile Orthanc by yourself <compiling>`, in debug mode by | |
| 30 setting ``-DCMAKE_BUILD_TYPE=Debug`` when invoking CMake. | |
| 31 | |
| 32 Then, learn how to use the debugger that is best suited to your | |
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33 platform (e.g. Microsoft Visual Studio, gdb, cgdb, or Xcode). |
| 244 | 34 |
| 35 | |
| 36 GNU/Linux system using gdb | |
| 37 -------------------------- | |
| 38 | |
| 39 .. highlight:: bash | |
| 40 | |
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41 The Orthanc project provides precompiled binaries with debug symbols |
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42 for the mainline that can run on almost any recent GNU/Linux system |
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43 (generated thanks to the `LSB - Linux Standard Base SDK |
| 244 | 44 <https://en.wikipedia.org/wiki/Linux_Standard_Base>`__). This allows |
| 45 to debug Orthanc without compiling from sources. Here is a sample | |
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46 debug session to analyze an error that comes from an invalid |
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47 :ref:`configuration file <configuration>`:: |
| 244 | 48 |
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49 $ wget https://orthanc.uclouvain.be/downloads/linux-standard-base/orthanc/mainline-debug/Orthanc |
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50 $ echo 'nope' > invalid.json |
| 244 | 51 $ chmod +x ./Orthanc |
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52 $ gdb --args ./Orthanc invalid.json |
| 244 | 53 (gdb) catch throw |
| 54 Catchpoint 1 (throw) | |
| 55 (gdb) run | |
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56 Starting program: /tmp/i/Orthanc invalid.json |
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57 [Thread debugging using libthread_db enabled] |
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58 Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". |
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59 W0103 18:25:01.540600 MAIN main.cpp:2041] Orthanc version: mainline (20240103T170440) |
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60 W0103 18:25:01.540636 MAIN main.cpp:1775] Performance warning: Non-release build, runtime debug assertions are turned on |
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61 W0103 18:25:01.540702 MAIN OrthancConfiguration.cpp:57] Reading the configuration from: "invalid.json" |
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62 E0103 18:25:01.540823 MAIN OrthancException.cpp:61] Cannot parse a JSON document: The configuration file does not follow the JSON syntax: invalid.json |
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63 |
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64 Catchpoint 1 (exception thrown), 0x00007ffff7cae4a1 in __cxa_throw () from /lib/x86_64-linux-gnu/libstdc++.so.6 |
| 244 | 65 (gdb) backtrace |
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66 #0 0x00007ffff7cae4a1 in __cxa_throw () from /lib/x86_64-linux-gnu/libstdc++.so.6 |
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67 #1 0x0000000000473745 in Orthanc::AddFileToConfiguration (target=..., path=...) |
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68 at /home/jodogne/BuildBotWorker/Orthanc_mainline_-_LSB_Debug/build/OrthancServer/Sources/OrthancConfiguration.cpp:72 |
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69 #2 0x0000000000473e98 in Orthanc::ReadConfiguration (target=..., configurationFile=0x7fffffffe302 "invalid.json") |
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70 at /home/jodogne/BuildBotWorker/Orthanc_mainline_-_LSB_Debug/build/OrthancServer/Sources/OrthancConfiguration.cpp:149 |
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71 [...] |
| 244 | 72 |
| 73 If you are unable to analyze such a backtrace by yourself, feel free | |
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74 to post your backtrace on the `Orthanc Users discussion forum |
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75 <https://discourse.orthanc-server.org>`__. Do not forget to indicate |
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76 the content of |
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77 `<https://orthanc.uclouvain.be/downloads/linux-standard-base/orthanc/mainline-debug/revision.txt>`__ |
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78 so that we can find the version of Orthanc that generated the core |
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79 file. |
| 244 | 80 |
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81 If you want to read the source code of the backtrace, it is highly |
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82 suggested to use ``cgdb`` with its ``set substitute-path`` command. |
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83 First read the content of the `revision.txt file |
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84 <https://orthanc.uclouvain.be/downloads/linux-standard-base/orthanc/mainline-debug/revision.txt>`__ |
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85 to identify the revision of Orthanc. Then, you can type:: |
| 244 | 86 |
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87 $ hg clone -r 723251b2b71e https://orthanc.uclouvain.be/hg/orthanc/ |
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88 $ cgdb --args ./Orthanc invalid.json |
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89 (gdb) set substitute-path /home/jodogne/BuildBotWorker/Orthanc_mainline_-_LSB_Debug/build/ ./orthanc/ |
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90 (gdb) catch throw |
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91 (gdb) run |
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92 (gdb) frame 2 |
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93 |
| 244 | 94 |
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95 Plugins |
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96 ....... |
| 244 | 97 |
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98 Besides the Orthanc core, debug LSB binaries are also available for |
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99 most official plugins at the following location: |
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100 `<https://orthanc.uclouvain.be/downloads/linux-standard-base/index.html>`__ |
| 244 | 101 |
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102 These binaries are identified as ``mainline-debug/``. |