[CONNECT C++] Random crashes inside the function mdlCExpression_getValue()

I have installed:

MicroStation CONNECT Edition
10.15.0.74

MicroStation CONNECT Edition SDK
10.15.00.076

Our application consists of 3 complex command dlls, each of which creates, uses, and frees several SymbolSets.  We encounter consistent but random crashes with calls to mdlCExpression_getValue() for workflows that execute command sequences that jump from one dll to the other (but not if you only execute commands from a single dll.)

Unfortunately I can't readily provide a simple test case due to the complexity and randomness of the problem.

Below is a typical stack seen inside exceptions.log.  Since I don't know much about how the mdlCExprssion API manages memory I'm not sure how to interpret this stack nor how to go about debugging the problem.

Any advice would be appreciated.

Thanks,

John M.

Call Stack

0: 000000bb591fc130 000000006ddadfce 000001f78270b290 000000006e3fde40 000001f7dd3f6970 000000006ddf0c03 mdlSymbols_getList+0x340 
 1: 000000bb591fc160 000000006ddaed28 000001f782ecee68 00000000ffffffff 000001f7dd3f6950 000000006e3fde40 mdlButtonMap_setNoInterpretArea+0x3fe 
 2: 000000bb591fc1a0 000000006ddef33f 000000bb591fc220 000001f782ecf2b8 00000000ffffffff 000001f7dd3f6950 mdlCExpression_publishTrustedFunction+0x18 
 3: 000000bb591fc210 000000006ddefd76 000001f782ecee68 000001f782eceef8 000001f782ecf2b8 00007ff913de12b8 mdlCExpression_isWCharPointer+0x23bf 
 4: 000000bb591fc260 000000006ddf08ab 0000000000000052 000000bb591fc310 0000000000000000 000000006dded149 mdlCExpression_isWCharPointer+0x2df6 
 5: 000000bb591fc2b0 000000006ddf0394 000000bb591fc780 0000000000000000 000000000000002b 0000000000000000 mdlCExpression_isWCharPointer+0x392b 
 6: 000000bb591fc330 000000006ddefb5e 000000bb591fc780 0000000000000000 0000000000000000 0000000000000000 mdlCExpression_isWCharPointer+0x3414 
 7: 000000bb591fc380 000000006ddf0284 0000000000000000 000000bb591fc780 000000bb591fc780 000000bb591fc439 mdlCExpression_isWCharPointer+0x2bde 
 8: 000000bb591fc3e0 000000006ddef89a 0000000000000000 000000bb591fc460 000000bb591fc780 0000000000000000 mdlCExpression_isWCharPointer+0x3304 
 9: 000000bb591fc470 000000006ddef774 0000000000000000 000000bb591fc780 0000000000000000 000001f7abf3fa70 mdlCExpression_isWCharPointer+0x291a 
10: 000000bb591fc4d0 000000006ddef5b4 0000000000000000 0000000000000000 000000bb591fc780 0000000000000000 mdlCExpression_isWCharPointer+0x27f4 
11: 000000bb591fc530 000000006ddf09a4 000001f782db4380 000000006dbbeb8c 000000bb591fc780 00007ff916dda3db mdlCExpression_isWCharPointer+0x2634 
12: 000000bb591fc590 000000006ddef694 000001f7829767b8 0000000000000000 0000953aa182e9f1 000000006db9ae70 mdlCExpression_isWCharPointer+0x3a24 
13: 000000bb591fc5f0 000000006ddefa50 000000bb591fc6c0 000000bb591fc780 000000006e5519f0 0000000000000000 mdlCExpression_isWCharPointer+0x2714 
14: 000000bb591fc650 000000006ddf00fb 0000000000000131 000000000000006c 0000000000000000 000000bb591fc890 mdlCExpression_isWCharPointer+0x2ad0 
15: 000000bb591fc6b0 000000006ddf0e34 000000bb591fc858 000000bb591fc780 000000bb591fc890 0000000000000000 mdlCExpression_isWCharPointer+0x317b 
16: 000000bb591fc700 000000006ddf0d80 00000000ffffff00 000000bb591fc780 000000006e5519f0 000000006ddf18f8 mdlCExpression_isWCharPointer+0x3eb4 
17: 000000bb591fc750 000000006ddaeaac 0000000000000002 000000bb591fc858 000000bb591fc890 0000000000000002 mdlCExpression_isWCharPointer+0x3e00 
18: 000000bb591fc7a0 000000006ddaea4b 000000bb591fc828 000000bb591fc858 000000bb591fc890 000001f7abf3fa70 mdlCExpression_getValueForApp+0x4c 
19: 000000bb591fc7e0 00007ff8800a2b6e 000001f7abf40010 0000000000000000 0000000000000000 0000000000000000 mdlCExpression_getValue+0x3b 
20: 000000bb591fc9c0 00007ff88009c45a 000001f7fd212000 cccccccccccccccc cccccccccccccccc cccccccccccccccc MdlMain+0x21001 
21: 000000bb591fca20 00007ff88009b2c6 000001f7a9ca0980 cccccccccccccccc cccccccccccccccc cccccccccccccccc MdlMain+0x1a8ed 
22: 000000bb591fca70 00007ff88009b6d4 000001f7a9ca0980 000001f782b9a8b0 0000000000000000 cccccccccccccccc MdlMain+0x19759 
23: 000000bb591fcb70 000000006dba20f3 000000bb591fcc30 0000000000000000 0000000000000001 00007ff900000000 MdlMain+0x19b67 
24: 000000bb591fcbf0 000000006dc1f907 000001f7a9c72320 000001f782b9a8b0 000001f782b70120 0000000000000001 mdlDialog_hookItemCall+0x133 
25: 000000bb591fcd30 000000006dc1f6ff 000001f7a9c72320 0000000000000000 000001f7a9c72320 0000000000000000 ListBox::SetTopRow+0xe0a7 
26: 000000bb591fcdc0 000000006dc26b76 000001f77fffffff 000001f7a9c72320 000001f700000000 000000000000001e ListBox::SetTopRow+0xde9f 
27: 000000bb591fce10 00007ff88009b618 000001f7abf40010 0000000000000000 0000000000000000 cccccccccccccccc mdlDialog_listBoxSelectCells+0x66 
28: 000000bb591fcf10 000000006dba20f3 000000bb591fcff0 0000000000000000 000000bb591fcf01 000000bb591fcff0 MdlMain+0x19aab 
29: 000000bb591fcf90 000000006dbb7c70 000001f7ddc23da8 000001f7a9c72320 000001f7dd0aec40 000001f7abf3f550 mdlDialog_hookItemCall+0x133 
30: 000000bb591fd0a0 000000006dbb8fbd 0000000000000000 0000000000000018 000001f782e2c5d0 0000000000000000 mdlDialog_updateNativeMenuTitle+0x730 
31: 000000bb591fd140 000000006dc66b11 0000000000000000 000001f7a9c6f5a8 0000000000000032 a400000100000000 mdlDialog_updateNativeMenuTitle+0x1a7d 
32: 000000bb591fd1e0 000000006dc6b5ea 000001f700000000 0000000000000000 000000bb591fd3a0 000000bb591fd299 Bentley::MstnPlatform::GuiLayoutTabPageList::SetGeometry+0x5771 
33: 000000bb591fd2f0 000000006db97a64 000000bb591fd3a0 0000000000000032 000000bb591fd3a0 000000006db9790f mdlDialog_tabPageSetLayoutManager+0x88a 
34: 000000bb591fd340 000000006dbba68b 000001f7dd0aec40 000000006dc6b570 000001f7dd0aec40 000001f7a996fb10 mdlDialog_itemMessageSend+0x114 
35: 000000bb591fd560 000000006dbba503 000001f7824a6b01 000001f7a996fb10 0000000000000000 0000000000000000 mdlDialog_rItemChildCreateWithRFileOpt+0x15b 
36: 000000bb591fd5d0 000000006dbb8e0e 000001f782e2d4b0 000001f7ddb67084 000001f7824a6b20 0000000000000002 mdlDialog_rItemChildCreateWRscAndRFileOpt+0x113 
37: 000000bb591fd670 000000006dc63e84 000001f782b9a8b0 000001f7ddb67058 000001f7a996f000 0000000000000000 mdlDialog_updateNativeMenuTitle+0x18ce 
38: 000000bb591fd720 000000006db97a64 000000bb591fd7d0 0000000000000000 000001f7824a6701 0000000000000000 Bentley::MstnPlatform::GuiLayoutTabPageList::SetGeometry+0x2ae4 
39: 000000bb591fd770 000000006dbb7c4e 000001f7dd0aec40 000000006dc6adc0 000001f782b70120 000001f782704b00 mdlDialog_itemMessageSend+0x114 
40: 000000bb591fd880 000000006dbb8fbd 0000000000000000 0000000000000008 000001f7828222f0 0000000000000000 mdlDialog_updateNativeMenuTitle+0x70e 
41: 000000bb591fd920 000000006dba700b 000001f782b70120 000001f782975a58 000000bb00000019 000001f700000000 mdlDialog_updateNativeMenuTitle+0x1a7d 
42: 000000bb591fdc00 000000006dba7d10 000001f700000000 0000000000000000 000000bb00000001 00007ff800000001 mdlWindow_undockWindow+0x9eb 
43: 000000bb591fdcc0 000000006dbad4bb 0000000000000001 000000bb591fdf80 000000bb591fdd44 0000000000000000 mdlWindow_undockWindow+0x16f0 
44: 000000bb591fdcf0 00007ff880088e1b 000000bb591fdeb0 00007ff880081e88 00007ff880081e88 cccccccc00000005 mdlDialog_openModal+0x2b 
45: 000000bb591fde30 000000006dfb5535 000000bb591fdeb0 00007ff880081e88 000001f7ddaffc01 0000000000000000 MdlMain+0x72ae 
46: 000000bb591fde70 000000006dec0116 000001f7e554c850 000000006e5618a0 000000bb591fe8c0 000001f7e554c850 SaveAndSwitchMdlDesc::~SaveAndSwitchMdlDesc+0xae5 
47: 000000bb591fe860 000000006dec3645 000000bb591fe8c0 0000000000000001 000001f78296e1e8 000001f7829767a0 priorityGui_initialize+0x8e6 
48: 000000bb591fe890 000000006dd5a3b4 000000006dd5bb30 000000006dd5bb30 0000000000000000 0000000000000000 mdlInput_processQueuedInput+0x25 

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