Fork#39268: g++ -O1 produces crashing code when accessing dlls via LoadLibrary()/GetProcAddress()/reinterpret_cast
Open Date: 2019-05-30 18:26
Last Update: 2019-05-31 08:51
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/39268
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Last Changes/Comment on this Ticket:
2019-05-31 08:51 Updated by: keith
Comment:
Reply To keith
Your J2534_API class constructor initializes its _J2534LIB private member
variable to NULL; you then invoke its selectLibrary() method ...
BTW, do you really need the selectLibrary() method anyway? I don't know your
requirements specification, but the ability to arbitrarily change the DLL
association of a J2534_API class instance, "on the fly", seems unusual. If you
don't explicitly need such a capability, why not bind the DLL within the
constructor itself, either using a name passed as a constructor argument, or
using a fixed name specified within the constructor code?
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Ticket Status:
Reporter: comer352l
Owner: (None)
Type: Issues
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: (None)
Severity: 5 - Medium
Resolution: None
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Ticket details:
I'm investigating the following crash, which occurs when accessing a dll via
LoadLibrary(), getProcAddress(), reinterpret_cast:
Problem signature:
Problem Event Name: BEX
Application Name: test.exe
...
Fault Module Name: StackHash_0a9e
...
Exception Offset: 0028fe9c
Exception Code: c0000005
Exception Data: badc0de1
...
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789
The code only crashes if it is compiled with -O1 (-O2, ...).
Moving around pieces of the code seems to fix the issue.
I was finally able to create some reduced example code with working / non
working variants (attachment follows).
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