RFR: 8343741: SA jstack --mixed should print information about VM locks [v3]

[Leonid Mesnik]

> Hi
> Could you please review the the fix that add locks information into SA jhsdb stack --mixed output.
> 
> Here is the motivation for this rfe and explanation why I add it into SA now.
> 
> The information about current owners of Hotspot Mutex is often very useful for dealock investigations.
> 
> The jcmd usually doesn't work because VM can't reach or exit safepoints. So it doesn't respond to jcmd.
> 
> The SA 'jstack --mixed' provides information about stacktraces on Java and non-Java Threads. So having information about locks along with stack traces might significantly help to identify issues.
> 
> The gdb allows to provide stacktraces, but the debug symbols are required to get info about locks. These symbols are often absent during execution.
> Also the debugger solution is OS specifc.
> 
> The significant part of fix is refacotorrng of mutex_array to be vmStructs compatible.
> 
> The adding support of non-JavaThreads into SA might be implemented later to obtain more info about their names.
> The example of output:
> 
> [2024-11-06T21:32:48.897414435Z] Gathering output for process 1620563
> Attaching to process ID 1620533, please wait...
> Debugger attached successfully.
> Server compiler detected.
> JVM version is 24-internal-adhoc.lmesnik.open
> Deadlock Detection:
> 
> No deadlocks found.
> 
> Internal VM Mutex Threads_lock is owned by Unknnown thread (Might be non-Java Thread) with address: 0x00007f8cf825b190
> Internal VM Mutex Compile_lock is owned by LockerThread with address: 0x00007f8cf8309a00
> ----------------- 1620559 -----------------
> "C1 CompilerThread4" https://github.com/openjdk/jdk/pull/28 daemon prio=9 tid=0x00007f8c300566a0 nid=1620559 runnable [0x0000000000000000]
> java.lang.Thread.State: RUNNABLE
> JavaThread state: _thread_blocked
> 0x00007f8cff11e88d syscall + 0x1d
> 0x00007f8cfe6c99de LinuxWaitBarrier::wait(int) + 0x8e
> 0x00007f8cfe2be409 SafepointMechanism::process(JavaThread*, bool, bool) + 0x79
> 0x00007f8cfd53ea91 ThreadInVMfromNative::ThreadInVMfromNative(JavaThread*) + 0xc1
> 0x00007f8cfd534a00 ciEnv::cache_jvmti_state() + 0x30
> 0x00007f8cfd679614 CompileBroker::invoke_compiler_on_method(CompileTask*) + 0x204
> 0x00007f8cfd67adc8 CompileBroker::compiler_thread_loop() + 0x5c8
> 0x00007f8cfdb4426c JavaThread::thread_main_inner() + 0xcc
> 0x00007f8cfe5a0bbe Thread::call_run() + 0xbe
> 0x00007f8cfe16813b thread_native_entry(Thread*) + 0x12b
> .....
> ----------------- 1620554 -----------------
> "LockerThread" https://github.com/openjdk/jdk/pull/31 prio=5 tid=0x00007f8cf8309a00 nid=1620554 waiting on condition ...

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  make test more robust

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22171/files
  - new: https://git.openjdk.org/jdk/pull/22171/files/93229db3..0fb641c9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22171&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22171&range=01-02

  Stats: 35 lines in 3 files changed: 21 ins; 1 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/22171.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22171/head:pull/22171

PR: https://git.openjdk.org/jdk/pull/22171