Level geometry and the Heap Size

rdb · December 9, 2017, 12:29am

Good luck!

Yes, pip is an essential part of the Python packaging ecosystem, and a must-have. It is also used by deploy-ng to grab prebuilt packages of Panda for different platforms (as a replacement to the old runtime.panda3d.org package system).

For clarification, --wheel builds a .whl file, a binary package that “pip” can install. It is also used by deploy-ng at build time, to pull files from that are shipped with the game (deploy-ng can be configured to read .whl files from a directory, or pull them from archive.panda3d.org/branches/deploy-ng )

Note that if you are going to do development, it may be easier not to install Panda at all, so that you don’t have to reinstall it whenever you make a source change. You can use Panda directly out of the build directory by configuring your shell environment. You can simply set the PYTHONPATH environment variable to the “built” directory that makepanda generates and add the “built/lib” directory to the LD_LIBRARY_PATH, and the Panda build should be fully functional from the Python prompt.

Thaumaturge · December 9, 2017, 4:36pm

Hmm… I’ve hit a snag: The build gets to a certain point–quite far along, I think–then exits due to an error returned by “ldd”. Specifically, this seems to be the error in question:

ldd: /usr/lib/libpython2.7.so: No such file or directory

And indeed, it seems to be correct: “/usr/lib/” doesn’t have a file named “libpython2.7.so”. Linking-files by that name do exist, however, in subdirectories of “/usr/lib”, including “/usr/lib/x86_64-linux-gnu”, which appears to be in my “LIBRARY_PATH” environment variable.

I could perhaps fix the immediate issue by creating another link in “/usr/lib”, but I’m hesitant to simply patch over the matter this way. Why is “ldd” not finding the file, and how can I point it in the right direction?

That’s interesting to know, thank you! Hmm… I’m inclined to nevertheless stick with installing it, I think. I don’t expect to engage in a lot of development, just small changes such as the previously-proposed rendering alteration, if that, and I’m more comfortable with having it installed.

rdb · December 10, 2017, 11:37am

Which part of the build is it failing at? Could you give more context (the last 20 lines of comman-line output)? Also, please use the --verbose flag.

Thaumaturge · December 11, 2017, 4:02pm

My apologies! It looks as though it’s failing when writing “panda3d-1.10.0-cp27-cp27mu-linux_x86_64.whl” (although I may have missed mention of some other action amidst the flood of “adding …” lines).

Here are the last ~20 lines of output:

Adding panda3d_tools/lwo-scan from /tmp/whlYXAMDo
Adding panda3d_tools/test_interrogate from /tmp/whl0WF8BO
Adding panda3d_tools/egg2obj from /tmp/whlycPwRa
Adding panda3d_tools/obj2egg from /tmp/whlS1erSy
Adding panda3d_tools/__init__.py from data
Adding panda3d-1.10.0.dist-info/entry_points.txt from data
Adding panda3d-1.10.0.dist-info/metadata.json from data
Adding panda3d-1.10.0.dist-info/METADATA from data
Adding panda3d-1.10.0.dist-info/WHEEL from data
Adding panda3d-1.10.0.dist-info/LICENSE.txt from LICENSE
Adding panda3d-1.10.0.dist-info/README.md from README.md
Adding panda3d-1.10.0.dist-info/top_level.txt from data
ldd: /usr/lib/libpython2.7.so: No such file or directory
Storing dependency cache.
Traceback (most recent call last):
  File "makepanda/makepanda.py", line 7531, in <module>
    makewheel(WHLVERSION, GetOutputDir())
  File "/home/thaumaturge/panda3d-deploy-ng/makepanda/makewheel.py", line 603, in makewheel
    whl.write_file('/deploy_libs/' + pylib_name, pylib_path)
  File "/home/thaumaturge/panda3d-deploy-ng/makepanda/makewheel.py", line 316, in write_file
    deps = scan_dependencies(source_path)
  File "/home/thaumaturge/panda3d-deploy-ng/makepanda/makewheel.py", line 231, in scan_dependencies
    raise subprocess.CalledProcessError(retcode, command[0], output=output)
subprocess.CalledProcessError: Command 'ldd' returned non-zero exit status 1

rdb · December 13, 2017, 1:11am

I’m not sure. I suggest you remove --wheel from the build command for now.

Thaumaturge · December 13, 2017, 3:46pm

All right, building with “–installer” instead of “–wheel” produces a working build.

However, this version of the engine doesn’t seem to work properly: while my level-editor runs happily, attempting to load a level–including one that worked happily under 1.9.4–results in the program exiting with an error code.

In the case of one level, the result was:

Process finished with exit code 139

(Which I believe means “invalid memory access”.)

In the case of another, the result was rather longer:

*** Error in `/usr/bin/python2.7': free(): ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f1f569707 /lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f1f569793 /lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f1f5697 /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(+0x /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(+0x /usr/lib/x86_64-linux-gnu/panda3d/libpandabullet.so.1. /usr/lib/python2.7/dist-packages/panda3d/bullet.so(+0x /usr/bin/python2.7(PyEval_EvalFrameEx+0x68a)[0x4c45fa] /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7(PyEval_EvalFrameEx+0x6118)[0x4ca088 /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7(PyEval_EvalCode+0x19)[0x4c24a9] /usr/bin/python2.7(PyRun_StringFlags+0x76)[0x520566] /usr/bin/python2.7(PyEval_EvalFrameEx+0x8e26)[0x4ccd96 /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7(PyEval_EvalFrameEx+0x686f)[0x4ca7df /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7[0x4de69e] /usr/bin/python2.7(PyObject_Call+0x43)[0x4b0c93] /usr/bin/python2.7(PyEval_EvalFrameEx+0x2f86)[0x4c6ef6 /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7[0x4de69e] /usr/bin/python2.7(PyObject_Call+0x43)[0x4b0c93] /usr/bin/python2.7(PyEval_EvalFrameEx+0x2f86)[0x4c6ef6 /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7(PyEval_EvalFrameEx+0x6118)[0x4ca088 /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7[0x4de69e] /usr/bin/python2.7(PyObject_Call+0x43)[0x4b0c93] /usr/bin/python2.7[0x4f452e] /usr/bin/python2.7(PyObject_Call+0x43)[0x4b0c93] /usr/lib/python2.7/dist-packages/panda3d/core.so(+0x70 /usr/lib/python2.7/dist-packages/panda3d/core.so(+0x70 /usr/lib/python2.7/dist-packages/panda3d/core.so(+0x70 /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/x86_64-linux-gnu/panda3d/libpanda.so.1.10(_ZN /usr/lib/python2.7/dist-packages/panda3d/core.so(+0x44 /usr/bin/python2.7(PyEval_EvalFrameEx+0x5770)[0x4c96e0 /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7(PyEval_EvalFrameEx+0x686f)[0x4ca7df /usr/bin/python2.7(PyEval_EvalFrameEx+0x5e0f)[0x4c9d7f /usr/bin/python2.7(PyEval_EvalCodeEx+0x255)[0x4c2705] /usr/bin/python2.7(PyEval_EvalCode+0x19)[0x4c24a9] /usr/bin/python2.7[0x4f19ef] /usr/bin/python2.7(PyRun_FileExFlags+0x82)[0x4ec372] /usr/bin/python2.7(PyRun_SimpleFileExFlags+0x191)[0x4e /usr/bin/python2.7(Py_Main+0x6c8)[0x49e208] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0 ======= Memory map: ======== 00400000-006e9000 r-xp 00000000 08:07 22937612 008e8000-008ea000 r--p 002e8000 08:07 22937612 008ea000-00961000 rw-p 002ea000 08:07 22937612 00961000-00984000 rw-p 00000000 00:00 0 02813000-1833d000 rw-p 00000000 00:00 0 4037f000-40420000 rw-p 00000000 00:00 0 406ce000-4076f000 rw-p 00000000 00:00 0 4158b000-4158d000 r-xs 00000000 08:07 18743697 7f1f24000000-7f1f24021000 rw-p 00000000 00:00 0 7f1f24021000-7f1f28000000 ---p 00000000 00:00 0 7f1f28ab2000-7f1f28eb2000 rw-s 00000000 00:06 792 7f1f28eb2000-7f1f292b2000 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21761345 7f1f568f9000-7f1f56ab9000 r-xp 00000000 08:07 21761998 7f1f56ab9000-7f1f56cb9000 ---p 001c0000 08:07 21761998 7f1f56cb9000-7f1f56cbd000 r--p 001c0000 08:07 21761998 7f1f56cbd000-7f1f56cbf000 rw-p 001c4000 08:07 21761998 7f1f56cbf000-7f1f56cc3000 rw-p 00000000 00:00 0 7f1f56cc3000-7f1f56cdb000 r-xp 00000000 08:07 21761323 7f1f56cdb000-7f1f56eda000 ---p 00018000 08:07 21761323 7f1f56eda000-7f1f56edb000 r--p 00017000 08:07 21761323 7f1f56edb000-7f1f56edc000 rw-p 00018000 08:07 21761323 7f1f56edc000-7f1f56ee0000 rw-p 00000000 00:00 0 7f1f56ee0000-7f1f56ef1000 r-xp 00000000 08:07 21758795 7f1f56ef1000-7f1f56ef2000 r-xp 00011000 08:07 21758795 7f1f56ef2000-7f1f56f06000 r-xp 00012000 08:07 21758795 7f1f56f10000-7f1f56f23000 rw-s 00000000 00:06 792 7f1f56f23000-7f1f56f43000 rw-s 00000000 00:06 792 7f1f56f43000-7f1f56fe3000 rw-p 00000000 00:00 0 7f1f56fed000-7f1f56ff4000 r--s 00000000 08:07 23336317 7f1f56ff4000-7f1f570d9000 rw-p 00000000 00:00 0 7f1f570dd000-7f1f570de000 rw-p 00000000 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/lib/x86_64-linux-gnu/libm-2.23.so /lib/x86_64-linux-gnu/libz.so.1.2.8 /lib/x86_64-linux-gnu/libz.so.1.2.8 /lib/x86_64-linux-gnu/libz.so.1.2.8 /lib/x86_64-linux-gnu/libz.so.1.2.8 /lib/x86_64-linux-gnu/libutil-2.23.so /lib/x86_64-linux-gnu/libutil-2.23.so /lib/x86_64-linux-gnu/libutil-2.23.so /lib/x86_64-linux-gnu/libutil-2.23.so /lib/x86_64-linux-gnu/libdl-2.23.so /lib/x86_64-linux-gnu/libdl-2.23.so /lib/x86_64-linux-gnu/libdl-2.23.so /lib/x86_64-linux-gnu/libdl-2.23.so /lib/x86_64-linux-gnu/libc-2.23.so /lib/x86_64-linux-gnu/libc-2.23.so /lib/x86_64-linux-gnu/libc-2.23.so /lib/x86_64-linux-gnu/libc-2.23.so /lib/x86_64-linux-gnu/libpthread-2.23.so /lib/x86_64-linux-gnu/libpthread-2.23.so /lib/x86_64-linux-gnu/libpthread-2.23.so /lib/x86_64-linux-gnu/libpthread-2.23.so /lib/x86_64-linux-gnu/ld-2.23.so /lib/x86_64-linux-gnu/ld-2.23.so /lib/x86_64-linux-gnu/ld-2.23.so /dev/nvidiactl /dev/nvidiactl /usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache /tmp/.glBIewAa (deleted) /dev/nvidiactl /dev/nvidiactl /dev/nvidia0 /dev/nvidia0 /dev/nvidiactl /lib/x86_64-linux-gnu/ld-2.23.so /lib/x86_64-linux-gnu/ld-2.23.so [stack] [vvar] [vdso] [vsyscall]

As to the “ldd” issue, I’ve done some digging, and I think that I may have found the source of the problem: Simply put, it seems that Python’s “LIBDIR” config variable (used to find the relevant directory for the Python “.so” file) points to “/usr/lib”. Note the reference to that directory in the output that I included in my previous post. However, under Ubuntu this isn’t correct–it should be pointing to the subdirectory that I mentioned, I believe.

It’s not clear to me why there is this discrepancy, or what general solution might be found.

On my end, at least, it’s possible that changing the value of “LIBDIR” might solve the issue, although I haven’t yet tried it.

Thaumaturge · December 15, 2017, 4:43pm

Some experimentation, supported by a skim through the output listed above, seems to indicate that the problem is occurring in my call to “BulletHelper.fromCollisionSolids”. (Which is being used to build the level’s collision geometry, at the point in the code at which the crash seems to occur.)

Interestingly, there seems to be very little difference in BulletHelper between the 1.9.4 version and the 1.10 version.

Looking at the method, I note that its removal of the given NodePath is controlled by a boolean parameter, and it turns out that setting that to “False” allows the method to succeed and the program to move on from that point. Thus it seems that the problem is likely in “remove_node”…

That said, even then it simply crashes at a later point. This time it looks as though it might be in the “findAllMatches” method of NodePath. Oddly, this isn’t the first call to that method, or even the first in the loop in which it occurs. o_0

Experimenting, it seems that the failure doesn’t occur if the tag isn’t present. It may also be worth noting that it’s operating on a NodePath that is itself the result of an earlier search (prior to the loop in which this call occurs).

Again, passing that by by skipping the search simply results in another crash later on.

(Note that the tests were performed by simply printing out lines of text at various points in my code, which may not be entirely reliable, I fear.)

It may be worth noting that the errors are not the same in each case: In addition to the error mentioned in the previous post, I’ve seen “free(): invalid pointer” and “munmap_chunk(): invalid pointer”.

Looking at the error output, I do note that all seem to be going through “cfree”, and that aside from the address in square brackets, the following few lines referring to “libpanda.so.1.10” seem to be the same.

rdb · December 16, 2017, 7:24pm

Could you try to isolate it, or reproduce it in a simpler program?

It might be related to the tags stuff. I recall some changes were made to the way tags were stored.

Thaumaturge · December 16, 2017, 11:49pm

I’ll give it a shot, I intend!

I don’t suppose that there’s a means of finding out what methods correspond to the entries in that backtrace–specifically, the ones that I mentioned just above, that seem to be common to multiple crashes?

I’ve noticed, by the way, that “from_colliision_solids” actually calls “find_all_matches”, and that it seems to be the deletion of one of the NodePaths derived from this that causes the crash in the former method. My suspicion thus currently falls on “find_all_matches”–although I don’t have solid evidence just yet…

Thaumaturge · December 17, 2017, 1:34am

Right, I believe that I’ve produced a minimal example! It does look right now as though the problem is tag-related. I haven’t managed to reproduce the issue without loading a model, oddly.

This zip file should contain a short Panda3D program and a simple model that the program loads. Note two things in the program: the commented-out call to “clearTag”, and the event that allows one to exit the program by pressing escape. The model should just be an empty with a tag.

On my machine, at least, uncommenting the call to “clearTag” causes the program to crash. If the call to “clearTag” is left commented-out, pressing “escape” to close the program causes the program to crash. (And note that commenting out the loading of the model allows one to exit without crashing.)

rdb · December 17, 2017, 12:12pm

I can’t reproduce it on my Windows laptop, neither with Python 2.7 nor 3.6. Can you be more specific about the OS, arch, revision, Python version used? Do you have any settings active I should be aware of, eg. threading-related?

Thaumaturge · December 18, 2017, 1:12pm

Let’s see:

As to settings, I believe that I’ve run the above code with no custom PRC file present, so it should be using the defaults there, I imagine.

OS: Ubuntu Linux 16.04 (“Xenial”) (x86-64)
CPU: Intel Core i7
Python: 2.7.12
The Python console in my IDE adds the following:

Python 2.7.12 (default, Nov 20 2017, 18:23:56) 
[GCC 5.4.0 20160609] on linux2

I’m not sure of what revision you’re asking for–would you clarify that, please? Sorry. ^^;

I built the engine using the following command line:

python makepanda/makepanda.py --everything --use-pandatool --no-ode --no-physx --no-speedtree --no-ffmpeg --no-fmodex --no-maya6 --no-maya65 --no-maya7 --no-maya8 --no-maya85 --no-maya2008 --no-maya2009 --no-maya2010 --no-maya2011 --no-maya2012 --no-maya2013 --no-maya2014 --no-maya2015 --no-maya2016 --no-maya20165 --no-maya2017 --no-max6 --no-max7 --no-max8 --no-max9 --no-max2009 --no-max2010 --no-max2011 --no-max2012 --no-max2013 --no-max2014 --no-vrpn --no-fftw --no-artoolkit --no-awesomium --no-carbon --no-cocoa --no-fcollada --no-wx --no-eigen --verbose --threads=4 --installer

I do have one small change to the code of the engine, but it just exposes an additional Bullet method. If I recall correctly, it’s the only alteration in place right now. Here are the changes (excluding comments):

BulletWorld.h:

INLINE void set_force_update_all_aabbs(bool force_update_all_aabbs);

BulletWorld.I:

INLINE void BulletWorld::
set_force_update_all_aabbs(bool force_update_all_aabbs) {

  _world->setForceUpdateAllAabbs(force_update_all_aabbs);
}

rdb · December 19, 2017, 6:08pm

By revision I mean which Git revision you checked out. You can find out by calling “git log -1”.

Thaumaturge · December 19, 2017, 6:34pm

Ah, I see–thank you for clarifying!

Unfortunately, I didn’t use the “git” program to download it–I simply clicked on the “Clone or download” button on the GitHub site.

I don’t suppose that the version is stored somewhere in the download?

For what it’s worth, I think, based on the file-date given for the downloaded zip and on a file in the extracted directory, that it was downloaded on the 6th of December of this year (a Wednesday).

However, I’ve now installed the “git” program, so I can hopefully check out via that in future. Would it help for me to use it to check out the current revision, and re-build with that?

rdb · December 20, 2017, 12:31am

Yes, that is advisable. You can use git to easily stay up-to-date with the latest version of the source code (“git pull”), as well as easily see which files were modified (“git diff”). I highly recommend looking into git in general, it’s a very useful tool.

I don’t think the auto-generated zip downloads from GitHub include the revision number, as far as I know. Quite a number of changes have been made since December 6th so it could be that the issue was already fixed. It would be good to know if it is still an issue in the latest version.

Thaumaturge · December 20, 2017, 2:18am

Fair enough. I believe that I have git installed, and the current version (as of a little earlier today) of the deploy-ng branch downloaded via it. Since I’m not terribly familiar with git, let me post the command-line that I used, in case I’ve made a mistake somewhere:

git clone -b deploy-ng https://github.com/panda3d/panda3d.git

For the moment I don’t really require much from a repository, I feel, and my small, local SVN server seems to suffice.

A pity, but not a major issue now that I’m using the actual “git” program, which as you pointed out allows me to check my version.

All right, I’ve built and installed the new version, and I’m afraid that it appears that the problem is still present on my end.

rdb · December 21, 2017, 4:06pm

Ah, you are using the deploy-ng branch. That is helpful to know.

I have merged the master branch into the deploy-ng branch today, could you pull and check whether it’s still an issue with the latest version?

Thaumaturge · December 21, 2017, 6:21pm

Ah, sorry! I think that I was under the impression that it was previously established, in this thread or another. ^^;

Presuming that I’ve done everything correctly, I’m afraid that the issue seems to still be present.

Might I perhaps have an old version of some utility library used by Panda, perhaps, something with a known issue? (I’ve done a little bit of searching on Google, but while I recall that I found some broadly similar issues in other projects, I don’t think that I found anything terribly useful-seeming.)

rdb · December 24, 2017, 10:43am

No, this is Panda code, so it’s unlikely to be some thirdparty package.

Thaumaturge · December 27, 2017, 2:22pm

I believe that my thinking was that, since the issue didn’t occur on your end but does on mine, the difference may lie in some element other than Panda3D (which we have in common). That said, it could also be some piece of code that has undefined behaviour that’s handled differently between our respective compilers/libraries, or some difference in a library’s implementation, or something else entirely…

Thinking about the issue further, and with a little experimentation, I’m inclined to suspect something that’s happening during model-loading: after all, there seems to be no crash when constructing a node-hierarchy “manually”, unlike a hierarchy constructed by loading a model.

For example, I changed the example above to also construct a set of nodes with similar properties, like so:

# Presume relevant importations

        # As before, for context:
        self.np = loader.loadModel("test")
        self.np.ls()

        # The new code:
        self.np2 = NodePath(ModelRoot("kitten"))
        self.np2.attachNewNode(PandaNode("cat"))
        self.np2.getChild(0).setTag("Cell", "Mew")

        self.np2.ls()

Aside from the names, these produce similar node-hierarchies, as shown by the output of the calls to “ls()”:

ModelRoot test.egg
  PandaNode Empty [Cell]
ModelRoot kitten
  PandaNode cat [Cell]

However, commenting out the model-loading, leaving just the manual hierarchy, results in the crash no longer occurring.

Another curiosity that I stumbled upon, that may or may not be useful (I include it just in case): At one point, I accidentally attempted to construct a NodePath without importing the class. Naturally, this resulted in the program exiting with a “NameError”. However, if the code that loads a NodePath from the example-model is present, this still causes a crash as the program exits (presumably it attempts to clean up as it does); if that code is commented out, there is again no crash.