RFR: JDK-8296907: VMError: add optional callstacks, siginfo for secondary errors

[Thomas Stuefe]

This was motivated by discussions we had in https://github.com/openjdk/jdk/pull/11017.

To aid in analyzing secondary errors during error reporting, it would be useful to see their callstacks for secondary errors. But printing callstacks during error reporting is unsafe - if we get a second crash or assert, it will cause infinite recursion and interrupt error reporting. Also, the hs-err file would be quite verbose. Therefore this feature is optional and limited to debug builds. 

---

Patch

- adds optional callstack/siginfo printing via debug-only switch `-XX:+ErrorLogSecondaryErrorDetails`.
- fixes a bug in secondary error handling where we would use the global scratch buffer recursively (via stringStream); that could lead to confusing output since it is used by the error log stream already. We can print directly to that one instead.
- Removed a stray newline from print_native_stack to clean output.
- added regression testing for this feature. I removed my name from the test since we don't do this anymore.
- added clarifying comments to the test and code
- added SAP copyright to the regression test (we introduced it years ago for JDK-8065895)

Output looks like this:


$ java ... -XX:+ErrorLogSecondaryErrorDetails


will produce, for secondary errors, siginfo and call stack.


[error occurred during error reporting (test secondary crash 1), id 0xb, SIGSEGV (0xb) at pc=0x00007fddfe8a0a61]
[siginfo: si_signo: 11 (SIGSEGV), si_code: 128 (SI_KERNEL), si_addr: 0x0000000000000000]
[stack: Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x1ceea61]  VMError::controlled_crash(int)+0x241  (vmError.cpp:1946)
V  [libjvm.so+0x1cf413f]  VMError::report(outputStream*, bool)+0x46bf  (vmError.cpp:564)
V  [libjvm.so+0x1cf516b]  VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x19b  (vmError.cpp:1709)
V  [libjvm.so+0x1cf5e8f]  VMError::report_and_die(Thread*, unsigned int, unsigned char*, void*, void*, char const*, ...)+0x8f  (vmError.cpp:1467)
V  [libjvm.so+0x1cf5ec2]  VMError::report_and_die(Thread*, unsigned int, unsigned char*, void*, void*)+0x22  (vmError.cpp:1473)
V  [libjvm.so+0x1a549e7]  JVM_handle_linux_signal+0x1f7  (signals_posix.cpp:656)
C  [libc.so.6+0x43090]
V  [libjvm.so+0x11d6965]  JNI_CreateJavaVM+0x5b5  (jni.cpp:3662)
C  [libjli.so+0x4013]  JavaMain+0x93  (java.c:1457)
C  [libjli.so+0x800d]  ThreadJavaMain+0xd  (java_md.c:650)
]

-------------

Commit messages:
 - JDK-8296907-VMError-add-optional-callstacks-siginfo-for-secondary-errors

Changes: https://git.openjdk.org/jdk/pull/11118/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11118&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296907
  Stats: 95 lines in 3 files changed: 71 ins; 4 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/11118.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11118/head:pull/11118

PR: https://git.openjdk.org/jdk/pull/11118