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Code Editor : BUGS.md
<!-- Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. SPDX-License-Identifier: curl --> # BUGS ## There are still bugs Curl and libcurl keep being developed. Adding features and changing code means that bugs sneak in, no matter how hard we try to keep them out. Of course there are lots of bugs left. Not to mention misfeatures. To help us make curl the stable and solid product we want it to be, we need bug reports and bug fixes. ## Where to report If you cannot fix a bug yourself and submit a fix for it, try to report an as detailed report as possible to a curl mailing list to allow one of us to have a go at a solution. You can optionally also submit your problem in [curl's bug tracking system](https://github.com/curl/curl/issues). Please read the rest of this document below first before doing that. If you feel you need to ask around first, find a suitable [mailing list]( https://curl.se/mail/) and post your questions there. ## Security bugs If you find a bug or problem in curl or libcurl that you think has a security impact, for example a bug that can put users in danger or make them vulnerable if the bug becomes public knowledge, then please report that bug using our security development process. Security related bugs or bugs that are suspected to have a security impact, should be reported on the [curl security tracker at HackerOne](https://hackerone.com/curl). This ensures that the report reaches the curl security team so that they first can deal with the report away from the public to minimize the harm and impact it has on existing users out there who might be using the vulnerable versions. The curl project's process for handling security related issues is [documented separately](https://curl.se/dev/secprocess.html). ## What to report When reporting a bug, you should include all information to help us understand what is wrong, what you expected to happen and how to repeat the bad behavior. You therefore need to tell us: - your operating system's name and version number - what version of curl you are using (`curl -V` is fine) - versions of the used libraries that libcurl is built to use - what URL you were working with (if possible), at least which protocol and anything and everything else you think matters. Tell us what you expected to happen, tell use what did happen, tell us how you could make it work another way. Dig around, try out, test. Then include all the tiny bits and pieces in your report. You benefit from this yourself, as it enables us to help you quicker and more accurately. Since curl deals with networks, it often helps us if you include a protocol debug dump with your bug report. The output you get by using the `-v` or `--trace` options. If curl crashed, causing a core dump (in Unix), there is hardly any use to send that huge file to anyone of us. Unless we have the same system setup as you, we cannot do much with it. Instead, we ask you to get a stack trace and send that (much smaller) output to us instead. The address and how to subscribe to the mailing lists are detailed in the `MANUAL.md` file. ## libcurl problems When you have written your own application with libcurl to perform transfers, it is even more important to be specific and detailed when reporting bugs. Tell us the libcurl version and your operating system. Tell us the name and version of all relevant sub-components like for example the SSL library you are using and what name resolving your libcurl uses. If you use SFTP or SCP, the libssh2 version is relevant etc. Showing us a real source code example repeating your problem is the best way to get our attention and it greatly increases our chances to understand your problem and to work on a fix (if we agree it truly is a problem). Lots of problems that appear to be libcurl problems are actually just abuses of the libcurl API or other malfunctions in your applications. It is advised that you run your problematic program using a memory debug tool like valgrind or similar before you post memory-related or "crashing" problems to us. ## Who fixes the problems If the problems or bugs you describe are considered to be bugs, we want to have the problems fixed. There are no developers in the curl project that are paid to work on bugs. All developers that take on reported bugs do this on a voluntary basis. We do it out of an ambition to keep curl and libcurl excellent products and out of pride. Please do not assume that you can just lump over something to us and it then magically gets fixed after some given time. Most often we need feedback and help to understand what you have experienced and how to repeat a problem. Then we may only be able to assist YOU to debug the problem and to track down the proper fix. We get reports from many people every month and each report can take a considerable amount of time to really go to the bottom with. ## How to get a stack trace First, you must make sure that you compile all sources with `-g` and that you do not 'strip' the final executable. Try to avoid optimizing the code as well, remove `-O`, `-O2` etc from the compiler options. Run the program until it cores. Run your debugger on the core file, like `<debugger> curl core`. `<debugger>` should be replaced with the name of your debugger, in most cases that is `gdb`, but `dbx` and others also occur. When the debugger has finished loading the core file and presents you a prompt, enter `where` (without quotes) and press return. The list that is presented is the stack trace. If everything worked, it is supposed to contain the chain of functions that were called when curl crashed. Include the stack trace with your detailed bug report, it helps a lot. ## Bugs in libcurl bindings There are of course bugs in libcurl bindings. You should then primarily approach the team that works on that particular binding and see what you can do to help them fix the problem. If you suspect that the problem exists in the underlying libcurl, then please convert your program over to plain C and follow the steps outlined above. ## Bugs in old versions The curl project typically releases new versions every other month, and we fix several hundred bugs per year. For a huge table of releases, number of bug fixes and more, see: https://curl.se/docs/releases.html The developers in the curl project do not have bandwidth or energy enough to maintain several branches or to spend much time on hunting down problems in old versions when chances are we already fixed them or at least that they have changed nature and appearance in later versions. When you experience a problem and want to report it, you really SHOULD include the version number of the curl you are using when you experience the issue. If that version number shows us that you are using an out-of-date curl, you should also try out a modern curl version to see if the problem persists or how/if it has changed in appearance. Even if you cannot immediately upgrade your application/system to run the latest curl version, you can most often at least run a test version or experimental build or similar, to get this confirmed or not. At times people insist that they cannot upgrade to a modern curl version, but instead, they "just want the bug fixed". That is fine, just do not count on us spending many cycles on trying to identify which single commit, if that is even possible, that at some point in the past fixed the problem you are now experiencing. Security wise, it is almost always a bad idea to lag behind the current curl versions by a lot. We keep discovering and reporting security problems over time see you can see in [this table](https://curl.se/docs/vulnerabilities.html) # Bug fixing procedure ## What happens on first filing When a new issue is posted in the issue tracker or on the mailing list, the team of developers first needs to see the report. Maybe they took the day off, maybe they are off in the woods hunting. Have patience. Allow at least a few days before expecting someone to have responded. In the issue tracker, you can expect that some labels are set on the issue to help categorize it. ## First response If your issue/bug report was not perfect at once (and few are), chances are that someone asks follow-up questions. Which version did you use? Which options did you use? How often does the problem occur? How can we reproduce this problem? Which protocols does it involve? Or perhaps much more specific and deep diving questions. It all depends on your specific issue. You should then respond to these follow-up questions and provide more info about the problem, so that we can help you figure it out. Or maybe you can help us figure it out. An active back-and-forth communication is important and the key for finding a cure and landing a fix. ## Not reproducible We may require further work from you who actually see or experience the problem if we cannot reproduce it and cannot understand it even after having gotten all the info we need and having studied the source code over again. ## Unresponsive If the problem have not been understood or reproduced, and there is nobody responding to follow-up questions or questions asking for clarifications or for discussing possible ways to move forward with the task, we take that as a strong suggestion that the bug is unimportant. Unimportant issues are closed as inactive sooner or later as they cannot be fixed. The inactivity period (waiting for responses) should not be shorter than two weeks but may extend months. ## Lack of time/interest Bugs that are filed and are understood can unfortunately end up in the "nobody cares enough about it to work on it" category. Such bugs are perfectly valid problems that *should* get fixed but apparently are not. We try to mark such bugs as `KNOWN_BUGS material` after a time of inactivity and if no activity is noticed after yet some time those bugs are added to the `KNOWN_BUGS` document and are closed in the issue tracker. ## `KNOWN_BUGS` This is a list of known bugs. Bugs we know exist and that have been pointed out but that have not yet been fixed. The reasons for why they have not been fixed can involve anything really, but the primary reason is that nobody has considered these problems to be important enough to spend the necessary time and effort to have them fixed. The `KNOWN_BUGS` items are always up for grabs and we love the ones who bring one of them back to life and offer solutions to them. The `KNOWN_BUGS` document has a sibling document known as `TODO`. ## `TODO` Issues that are filed or reported that are not really bugs but more missing features or ideas for future improvements and so on are marked as *enhancement* or *feature-request* and get added to the `TODO` document and the issues are closed. We do not keep TODO items open in the issue tracker. The `TODO` document is full of ideas and suggestions of what we can add or fix one day. You are always encouraged and free to grab one of those items and take up a discussion with the curl development team on how that could be implemented or provided in the project so that you can work on ticking it odd that document. If an issue is rather a bug and not a missing feature or functionality, it is listed in `KNOWN_BUGS` instead. ## Closing off stalled bugs The [issue and pull request trackers](https://github.com/curl/curl) only hold "active" entries open (using a non-precise definition of what active actually is, but they are at least not completely dead). Those that are abandoned or in other ways dormant are closed and sometimes added to `TODO` and `KNOWN_BUGS` instead. This way, we only have "active" issues open on GitHub. Irrelevant issues and pull requests do not distract developers or casual visitors.
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