RFR: 8345676: [ubsan] ProcessImpl_md.c:561:40: runtime error: applying zero offset to null pointer on macOS aarch64

[Matthias Baesken]

On Fri, 3 Jan 2025 10:29:31 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> When starting :tier1 jdk jtreg tests with
> /jtreg_latest/bin/jtreg
> this error is show when running ubsanized binaries on macOS aarch64 (XCode 13.1 and 15.4 show this)
> 
> src/java.base/unix/native/libjava/ProcessImpl_md.c:561:40: runtime error: applying zero offset to null pointer
>     #0 0x102a6552c in startChild ProcessImpl_md.c:621
>     #1 0x102a64480 in Java_java_lang_ProcessImpl_forkAndExec ProcessImpl_md.c:721
>     #2 0x13f53c4fc (<unknown module>)
>     #3 0x13f5387cc (<unknown module>)
>     #4 0x13f53894c (<unknown module>)
>     #5 0x13f5386dc (<unknown module>)
>     #6 0x13f5386dc (<unknown module>)
>     #7 0x13f5386dc (<unknown module>)
>     #8 0x13f53894c (<unknown module>)
>     #9 0x13f53894c (<unknown module>)
>     #10 0x13f534110 (<unknown module>)
>     #11 0x107de60e0 in JavaCalls::call_helper(JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*) javaCalls.cpp:416
>     #12 0x107ebf778 in jni_invoke_static(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, JavaThread*) jni.cpp:885
>     #13 0x107ec2778 in jni_CallStaticVoidMethod jni.cpp:1714
>     #14 0x102e86210 in invokeStaticMainWithArgs java.c:392
>     #15 0x102e884e8 in JavaMain java.c:640
>     #16 0x102e8d79c in ThreadJavaMain java_md_macosx.m:679
>     #17 0x19d38ef90 in _pthread_start+0x84 (libsystem_pthread.dylib:arm64e+0x6f90)
>     #18 0x19d389d30 in thread_start+0x4 (libsystem_pthread.dylib:arm64e+0x1d30)
> 
> Looks similar to
> https://www.reddit.com/r/C_Programming/comments/133oxnc/null_0_is_ub_this_is_not_what_you_would_expect/?rdt=41590
> and
> https://trac.ffmpeg.org/changeset/9c0b3eddf4262f9dcea479091f1307444e614e88/ffmpeg

Hi Roger, thanks for the review !

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PR Comment: https://git.openjdk.org/jdk/pull/22910#issuecomment-2574641996