Segfault of the day ...

by **Hooray** » Sun Nov 10, 2013 12:03 am

This is probably triggered via some rogue Nasal code, I assume that there could be listeners still running when the canvas is no longer valid (see the backtrace), but haven't checked thoroughly:

I'm getting this segfault (reproducably) when using the airport selection dialog, closing and re-opening it seems to trigger the listener - so it's certainly bad Nasal code in combination with some C++ code that doesn't seem hardened enough:

Code: Select all: #0 0x0000000000dd98e5 in simgear::canvas::Element::getParentStyle(SGPropertyNode const*) const () #1 0x0000000000dd9a1f in simgear::canvas::Element::childRemoved(SGPropertyNode*, SGPropertyNode*) () #2 0x0000000000fd5e0d in SGPropertyNode::fireChildrenRemovedRecursive() () #3 0x0000000000fd0f27 in simgear::PropertyBasedMgr::childRemoved(SGPropertyNode*, SGPropertyNode*) () #4 0x0000000000fd9e60 in SGPropertyNode::removeChild(int, bool) () #5 0x0000000000fda0db in SGPropertyNode::removeChildren(char const*, bool) () #6 0x00000000009daf1a in f_removeChildren(Context*, naRef, int, naRef*) () #7 0x0000000000fafd9f in setupFuncall () #8 0x0000000000fb204c in run () #9 0x0000000000fb4398 in naCall () #10 0x0000000000fb44a4 in naCallMethodCtx () #11 0x0000000000fb45d2 in naCallMethod () #12 0x00000000009cbaeb in FGNasalListener::call(SGPropertyNode*, naRef) () #13 0x00000000009cbbb3 in FGNasalListener::valueChanged(SGPropertyNode*) () #14 0x0000000000fdf5a8 in SGPropertyNode::set_string(char const*) () #15 0x0000000000fdd157 in SGPropertyNode::setStringValue(char const*) () #16 0x0000000000fdd551 in SGPropertyNode::setStringValue(char const*, char const*) () #17 0x00000000009ca67e in f_setprop(Context*, naRef, int, naRef*) () #18 0x0000000000fafd9f in setupFuncall () #19 0x0000000000fb204c in run () #20 0x0000000000fb4398 in naCall () #21 0x0000000000fb44a4 in naCallMethodCtx () #22 0x0000000000fb45d2 in naCallMethod () #23 0x00000000009cb9be in FGNasalSys::handleCommand(char const*, char const*, char const*, SGPropertyNode const*) () #24 0x0000000000798131 in CanvasWidget::CanvasWidget(int, int, int, int, SGPropertyNode*, std::string const&) () #25 0x00000000007b2076 in FGPUIDialog::makeObject(SGPropertyNode*, int, int) ()

(don't bother looking at the Nasal code, we're rewriting it anyway - so this is just about the C++ side)

by **TheTom** » Sun Nov 10, 2013 5:16 pm

I'm not completely sure about the cause, but I have pushed something to SimGear which possibly fixes it.

by **Hooray** » Mon Nov 11, 2013 3:17 am

thanks for looking into it, I updated OSG/SG/FG + fgdata, but still seeing this - for example, when viewing the route layer in the airport selection dialog and panning way out of range

Code: Select all: #0 0x0000000000dda4ae in simgear::canvas::Element::getParentStyle(SGPropertyNode const*) const () #1 0x0000000000dda5ef in simgear::canvas::Element::childRemoved(SGPropertyNode*, SGPropertyNode*) () #2 0x0000000000fd73ed in SGPropertyNode::fireChildrenRemovedRecursive() () #3 0x0000000000fd2507 in simgear::PropertyBasedMgr::childRemoved(SGPropertyNode*, SGPropertyNode*) () #4 0x0000000000fdb440 in SGPropertyNode::removeChild(int, bool) () #5 0x0000000000fdb6bb in SGPropertyNode::removeChildren(char const*, bool) () #6 0x00000000009db9ba in f_removeChildren(Context*, naRef, int, naRef*) () #7 0x0000000000fb137f in setupFuncall () #8 0x0000000000fb362c in run () #9 0x0000000000fb5978 in naCall () #10 0x0000000000fb5a84 in naCallMethodCtx () #11 0x0000000000fb5bb2 in naCallMethod () #12 0x00000000009cc58b in FGNasalListener::call(SGPropertyNode*, naRef) () #13 0x00000000009cc653 in FGNasalListener::valueChanged(SGPropertyNode*) () #14 0x0000000000fe0b88 in SGPropertyNode::set_string(char const*) () #15 0x0000000000fde737 in SGPropertyNode::setStringValue(char const*) () #16 0x0000000000fdeb31 in SGPropertyNode::setStringValue(char const*, char const*) () #17 0x00000000009cb11e in f_setprop(Context*, naRef, int, naRef*) () #18 0x0000000000fb137f in setupFuncall () #19 0x0000000000fb362c in run () #20 0x0000000000fb5978 in naCall () #21 0x0000000000fb5a84 in naCallMethodCtx () #22 0x0000000000fb5bb2 in naCallMethod () #23 0x00000000009cc45e in FGNasalSys::handleCommand(char const*, char const*, char const*, SGPropertyNode const*) () #24 0x00000000009ca881 in FGNasalSys::handleCommand(SGPropertyNode const*) () #25 0x0000000000fede8f in SGBinding::innerFire() const ()

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Segfault of the day ...

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