segfault during unit tests on ppc64le and loongarch64

[maribu]

Steps to Reproduce

On Alpine on ppc64le or loongarch64 using the source from the tag 7.0 run:

sudo apk add cjson-dev cmake qt6-qtbase-dev samurai
cmake -B build -G Ninja -Wno-dev \
	-DCMAKE_BUILD_TYPE=MinSizeRel \
	-DCMAKE_INSTALL_PREFIX=/usr \
	-DBUILD_SHARED_LIBS=ON \
	-DBUILD_TOOLS=ON \
	-DBUILD_TESTING=ON \
	#
cmake --build build

Expected Results

The unit tests pass

Actual Result

ppc64le

Test project /builds/maribu/aports/community/tinycbor/src/tinycbor-7.0/build
    Start 1: tst_c90
    Start 2: tst_cpp
    Start 3: tst_encoder
    Start 4: tst_parser
    Start 5: tst_tojson
1/5 Test #1: tst_c90 ..........................   Passed    0.01 sec
2/5 Test #2: tst_cpp ..........................   Passed    0.01 sec
3/5 Test #4: tst_parser .......................***Exception: SegFault  0.01 sec
********* Start testing of tst_Parser *********
Config: Using QtTest library 6.11.0, Qt 6.11.0 (power64-little_endian-lp64 shared (dynamic) release build; by GCC 15.2.0), alpine 3.21.0_alpha20240923
PASS   : tst_Parser::initTestCase()
PASS   : tst_Parser::initParserEmpty()
Received signal 11 (SIGSEGV), code SEGV_ACCERR, accessing address 0x00007fffa50b0fff
         integers function time: 0ms, total time: 1ms
4/5 Test #5: tst_tojson .......................   Passed    0.03 sec
5/5 Test #3: tst_encoder ......................   Passed    0.07 sec
80% tests passed, 1 tests failed out of 5
Total Test time (real) =   0.07 sec
The following tests FAILED:
	  4 - tst_parser (SEGFAULT)
Errors while running CTest

(Excerpt from the full CI build log.)

loongarch64

Test project /builds/maribu/aports/community/tinycbor/src/tinycbor-7.0/build
    Start 1: tst_c90
    Start 2: tst_cpp
    Start 3: tst_encoder
    Start 4: tst_parser
    Start 5: tst_tojson
1/5 Test #1: tst_c90 ..........................   Passed    0.01 sec
2/5 Test #2: tst_cpp ..........................   Passed    0.01 sec
3/5 Test #4: tst_parser .......................***Exception: SegFault  0.02 sec
********* Start testing of tst_Parser *********
Config: Using QtTest library 6.11.0, Qt 6.11.0 (loongarch64-little_endian-lp64 shared (dynamic) release build; by GCC 15.2.0), alpine 3.21.0_alpha20240923
PASS   : tst_Parser::initTestCase()
PASS   : tst_Parser::initParserEmpty()
Received signal 11 (SIGSEGV), code SEGV_ACCERR, accessing address 0x00007ffff23b8fff
         integers function time: 0ms, total time: 1ms
4/5 Test #5: tst_tojson .......................   Passed    0.04 sec
5/5 Test #3: tst_encoder ......................   Passed    0.13 sec
80% tests passed, 1 tests failed out of 5
Total Test time (real) =   0.13 sec
The following tests FAILED:
	  4 - tst_parser (SEGFAULT)
Errors while running CTest

(Excerpt from the full CI build log.)

[thiagomacieira]

Do you have a backtrace of the crash?

[thiagomacieira]

The interesting thing is both cases are showing an address ending in 0xfff. I don't know that it is related to the problem, but I don't like coincidences.