ubsan (undefined behaviour sanitizer) errors in GitHub CI

[matejk]

Describe the bug

Reported in CI:

https://github.com/pocoproject/poco/actions/runs/14028210164/job/39270503936#step:5:727

testAnyCastToReference: /Users/runner/work/poco/poco/Foundation/include/Poco/Any.h:467:8: runtime error: downcast of address 0x7ff7bccd7570 which does not point to an object of type 'Any::Holder<volatile int>'
0x7ff7bccd7570: note: object is of type 'Poco::Any::Holder<int>'
 08 ea df 9d  68 c4 13 04 01 00 00 00  89 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'Poco::Any::Holder<int>'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/runner/work/poco/poco/Foundation/include/Poco/Any.h:467:8 in 
/Users/runner/work/poco/poco/Foundation/include/Poco/Any.h:467:66: runtime error: member access within address 0x7ff7bccd7570 which does not point to an object of type 'Any::Holder<volatile int>'
0x7ff7bccd7570: note: object is of type 'Poco::Any::Holder<int>'
 08 ea df 9d  68 c4 13 04 01 00 00 00  89 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'Poco::Any::Holder<int>'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/runner/work/poco/poco/Foundation/include/Poco/Any.h:467:66 in 

https://github.com/pocoproject/poco/actions/runs/14028210164/job/39270503936#step:5:727

testClassLoader2: TestLibrary initializing
src/ClassLoaderTest.cpp:110:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginA'
 00 00 00 00  60 16 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginA'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:110:2 in 
src/ClassLoaderTest.cpp:112:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginA'
 00 00 00 00  60 16 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginA'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:112:2 in 
src/ClassLoaderTest.cpp:115:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginB'
 00 00 00 00  10 17 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginB'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:115:2 in 
src/ClassLoaderTest.cpp:116:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginB'
 00 00 00 00  10 17 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginB'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:116:2 in 
src/ClassLoaderTest.cpp:119:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginB'
 00 00 00 00  10 17 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginB'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:119:2 in 
src/ClassLoaderTest.cpp:120:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginB'
 00 00 00 00  10 17 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginB'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:120:2 in 
src/ClassLoaderTest.cpp:127:2: runtime error: member call on address 0x600003cfc2f0 which does not point to an object of type 'TestPlugin'
0x600003cfc2f0: note: object is of type 'PluginC'
 00 00 00 00  c8 17 5c 05 01 00 00 00  00 00 00 00 00 00 00 00  00 c3 f5 c6 24 65 00 00  32 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'PluginC'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/ClassLoaderTest.cpp:127:2 in 
TestLibrary uninitializing

https://github.com/pocoproject/poco/actions/runs/14028210164/job/39270503909#step:5:190

testAnyCastToReference: /home/runner/work/poco/poco/Foundation/include/Poco/Any.h:467:8: runtime error: downcast of address 0x7ffca0cae130 which does not point to an object of type 'Holder'
0x7ffca0cae130: note: object is of type 'Poco::Any::Holder<int>'
 98 55 00 00  20 10 30 07 98 55 00 00  89 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'Poco::Any::Holder<int>'

Expected behavior

ubsan reports no errors.

Please add relevant environment information:

• OS Type and Version: macOS 13.7.4, Ubuntu Linux 24.04
• POCO Version: 1.14.2

[matejk]

• Case 1: Holder contains Any::Holder<int> but cast to Any::Holder<volatile int> is attempted.
• Case 2: Object is of type PluginA, PluginB, PluginB but pointer is TestPlugin
• Case 3: same as Case 1, reported on Linux

[matejk]

It seems that ubsan errors are expected in these situations and shall be added to ignore list in a similar way as tsan has a suppress list.