[Bug]: absl_stacktrace_test fails on powerpc64le-linux-gnu

[doko42]

Describe the issue

with the 20250815.1 release, this test fails on powerpc64le-linux-gnu:

complete build logs at
https://buildd.debian.org/status/logs.php?pkg=abseil&arch=ppc64el

66: Test command: /build/reproducible-path/abseil-20250814.1/static/bin/absl_decode_rust_punycode_test
66: Working Directory: /build/reproducible-path/abseil-20250814.1/static/absl/debugging
66: Test timeout computed to be: 1500
62: [ OK ] StackTrace.FixupLowStackUsage (11 ms)
62: [ RUN ] StackTrace.CustomUnwinderPerformsFixup
62: [ OK ] StackTrace.CustomUnwinderPerformsFixup (0 ms)
62: [ RUN ] StackTrace.CanonicalFrameAddresses
62: [ OK ] StackTrace.CanonicalFrameAddresses (0 ms)
62: [ RUN ] StackTrace.NestedSignal
62: absl_stacktrace_test: ./absl/debugging/internal/stacktrace_powerpc-inl.inc:117: void** NextStackFrame(void**, const void*) [with bool STRICT_UNWINDING = true; bool IS_WITH_CONTEXT = true]: Assertion `false && "VDSO is present, but doesn't have expected symbol"' failed.
64: [ OK ] DemangleRegression.DeeplyNestedArrayType (2 ms)
64: [ RUN ] DemangleRegression.ShortOutputBuffer
64: [ OK ] DemangleRegression.ShortOutputBuffer (0 ms)
64: [----------] 3 tests from DemangleRegression (3 ms total)
64:
64: [----------] 1 test from DemangleStringTest
64: [ RUN ] DemangleStringTest.SupportsSymbolNameReturnedByTypeId
59/218 Test #62: absl_stacktrace_test ...............................Subprocess aborted***Exception: 0.02 sec
Running main() from gmock_main.cc
[==========] Running 5 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 5 tests from StackTrace
[ RUN ] StackTrace.FixupNoFixupEquivalence
./absl/debugging/stacktrace_test.cc:107: Skipped
Frame pointers are required, but not guaranteed in OSS

[ SKIPPED ] StackTrace.FixupNoFixupEquivalence (0 ms)
[ RUN ] StackTrace.FixupLowStackUsage
[ OK ] StackTrace.FixupLowStackUsage (11 ms)
[ RUN ] StackTrace.CustomUnwinderPerformsFixup
[ OK ] StackTrace.CustomUnwinderPerformsFixup (0 ms)
[ RUN ] StackTrace.CanonicalFrameAddresses
[ OK ] StackTrace.CanonicalFrameAddresses (0 ms)
[ RUN ] StackTrace.NestedSignal
absl_stacktrace_test: ./absl/debugging/internal/stacktrace_powerpc-inl.inc:117: void** NextStackFrame(void**, const void*) [with bool STRICT_UNWINDING = true; bool IS_WITH_CONTEXT = true]: Assertion `false && "VDSO is present, but doesn't have expected symbol"' failed.

Steps to reproduce the problem

build on Debian unstable

What version of Abseil are you using?

20250815.1

What operating system and version are you using?

Debian unstable

What compiler and version are you using?

GCC 15 from the gcc-15 branch

What build system are you using?

cmake version 3.31.6

Additional context

No response