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#222 JSBSim NaNs on reset/reposition
Originally created by: zakalawe@mac.com
Originally owned by: zakalawe@mac.com
(I can't find a specific bug report for this, so filing this one)
When doing reset or re-position, both of which ultimately end up calling fgReInitSubsystems, JSBSIm aircraft often experience NaN-related crashes/un-caught exception throws. During init of JSBSim for the second (or greater) time, it performs an update with dt=0, and during this update, NaNs are generated.
Since the problem never happens on the first init of JSBSIm, it is presumed to relate to some static data, or uninitalized memory.
The problem has not always existed, and has got markedly worse since the 2.0 release - it used to occur with some low probability on each reset/reposition, but now occurs with 100% probability on any reset or reposition, for me. (But not necessarily for other users)
As soon as JSBSIm generates NaNs for /position/longitude-deg and latitude-deg, all code that depends on those (OpenAL, OSG, tile-manager, terrain intersection) ceases to function correctly - this tends to be the symptoms reported.
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Originally posted by: zakalawe@mac.com
Note that bug 204 post-dates this, and is a much more specific bug that has been introduced into JSBsim. Even when bug 204 is fixed, this issue, which is currently masked by it, will presumably re-appear.
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#204View and moderate all "codetickets Discussion" comments posted by this user
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Originally posted by: zakalawe@mac.com
Pushed:
http://gitorious.org/fg/flightgear/commit/738d653745142f61ddcf1f4845532135f29dc8fa
which makes a considerable difference to this for me - so far, I was not able to produce a NaN on reposition or reset with the C172. This needs wider testing and feedback now. (If you're testing, a find a NaN that can only reproduced with a particular aircraft, or init option, then please file a separate defect, since that is probably a different bug to this)
Status: Testing
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Originally posted by: g...@av8n.com
At the moment, this seems to be not entirely fixed ... but no longer 100%
reproducible. I'm seeing NaN-related disasters maybe 1 time out of 5 when
repositioning to a ground (airport) location.
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Originally posted by: bre... (code.google.com)@gmail.com
Another fix is available which may finally solve this issue (hopefully!).
See emails with descriptions by Andreas Gaeb on the mailing-list.
I'm also attaching the two patches here - just in case...
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Originally posted by: zakalawe@mac.com
Andreas' fixes are merged, and seem to work well for me - if you were experiencing this bug, please re-test with latest Git code, and provide feedback here.
Relevant commit:
http://gitorious.org/fg/flightgear/commit/4f364af6d178d947eae1a5a751e3a9542b270069
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Originally posted by: bre... (code.google.com)@gmail.com
Two more commits are relevant to fix this problem:
http://www.gitorious.org/fg/flightgear/commit/287cc74965e11ff3888117a9d9b88ed2bdbb9252
http://www.gitorious.org/fg/flightgear/commit/ad8d46ba648263630b8777c53f852b75cad7ecdd
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Originally posted by: bre... (code.google.com)@gmail.com
Considered fixed. Need a new report otherwise.
Status: Fixed
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Originally posted by: bre... (code.google.com)@gmail.com
(No comment was entered for this change.)
Status: Temp
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Originally posted by: bre... (code.google.com)@gmail.com
(No comment was entered for this change.)
Status: Fixed
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Originally posted by: bre... (code.google.com)@gmail.com
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Labels: Milestone-2.4.0