SafeFetch leads to hard crash on macOS 14.4

[Maxim Kartashev]

Hello!

This has been recently filed as https://bugs.openjdk.org/browse/JDK-8327860
but I also wanted to check with the community if any further info on the
issue is available.

It looks like in some cases SafeFetch is directed to fetch something the OS
really doesn't want it to and, instead of promoting the error to a signal
and letting the application (JVM) deal with it, immediately terminates the
application. All we've got is the OS crash report, not even the JVM's fatal
error log. This looks like an application security precaution, which I am
not at all familiar with.

The relevant pieces of the crash log are below. Is anybody familiar with
"Namespace GUARD" termination reason and maybe other related novelties of
macOS 14.4? The error was not reported before upgrading to 14.4

Thanks in advance,

Maxim.

0 libjvm.dylib 0x1062d6ec0 _SafeFetchN_fault + 0
1 libjvm.dylib 0x1062331a4 ObjectMonitor::TrySpin(JavaThread*) + 408
2 libjvm.dylib 0x106232b44 ObjectMonitor::enter(JavaThread*) + 228
3 libjvm.dylib 0x10637436c ObjectSynchronizer::enter(Handle, BasicLock*,
JavaThread*) + 392
...

Exception Type:        EXC_BAD_ACCESS (SIGKILL)
Exception Codes:       KERN_PROTECTION_FAILURE at 0x00000001004f4000
Exception Codes:       0x0000000000000002, 0x00000001004f4000

Termination Reason:    Namespace GUARD, Code 5

VM Region Info: 0x1004f4000 is in 0x1004f4000-0x1004f8000;  bytes after
start: 0  bytes before end: 16383
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX
SHRMOD  REGION DETAIL
      mapped file                 1004e4000-1004f4000    [   64K] r--/r--
SM=COW  Object_id=fa8d88e7
--->  VM_ALLOCATE                 1004f4000-1004f8000    [   16K] ---/rwx
SM=NUL
      VM_ALLOCATE                 1004f8000-1004fc000    [   16K] r--/rwx
SM=PRV
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