RFR (XS): 8035983: Fix "Native frames:" in crash report (hs_err file)

[Vladimir Kozlov]

On 2/27/14 5:38 PM, Christian Thalinger wrote:
>
> On Feb 27, 2014, at 4:33 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
>
>> https://bugs.openjdk.java.net/browse/JDK-8035983
>> http://cr.openjdk.java.net/~kvn/8035983/webrev/
>>
>> We don't print whole stack if native frames intermix with compiled java frames (on x86 fp is used by compiled code).
>> Instead of using os::is_first_C_frame() which produces incorrect result for compiled java frames I am suggesting to look on frame's stack pointer relative to stack base.
>
> I have two questions:
>
> 1) Why does this work:
>
> +              // Catch very first native frame by using stack address.
> +              if (!_thread->on_local_stack((address)(fr.sp() + 4))) break;
>
> Because we set the stack base to the current value when we start the thread?

You are right not all threads have stack base set (all VM's thread do). 
So I need to add check for stack_size() != 0 and use is_first_C_frame() 
if it is 0 (uninitialized).

>
> 2) Why does this not work?  I have seen many correct stack traces in the past.

Look on os::is_first_C_frame(). It does some stupid simple checks which 
nothing to do with real value. The test will pass if a java compiled 
code has a pointer in EBP register.

Thanks,
Vladimir

>
>>
>> Thanks,
>> Vladimir
>>
>> Output before the fix:
>>
>> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
>> V  [libjvm.so+0x1e28428]  void VMError::report(outputStream*)+0x1478
>> V  [libjvm.so+0x1e29dd4]  void VMError::report_and_die()+0x6b4
>> V  [libjvm.so+0x14ad9ba]  void report_vm_error(const char*,int,const char*,const char*)+0x9a
>> V  [libjvm.so+0x1b6ccf5]  void ObjectMonitor::exit(bool,Thread*)+0x125
>> V  [libjvm.so+0x1d41cda]  void ObjectSynchronizer::fast_exit(oopDesc*,BasicLock*,Thread*)+0x38a
>> V  [libjvm.so+0x1d41fba]  void ObjectSynchronizer::slow_exit(oopDesc*,BasicLock*,Thread*)+0x2a
>> V  [libjvm.so+0x1caa13f]  void SharedRuntime::complete_monitor_unlocking_C(oopDesc*,BasicLock*)+0x27f
>>
>>
>> After the fix:
>>
>> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
>> V  [libjvm.so+0x1e28428]  void VMError::report(outputStream*)+0x1478
>> V  [libjvm.so+0x1e29dd4]  void VMError::report_and_die()+0x6b4
>> V  [libjvm.so+0x14ad9ba]  void report_vm_error(const char*,int,const char*,const char*)+0x9a
>> V  [libjvm.so+0x1b6ccf5]  void ObjectMonitor::exit(bool,Thread*)+0x125
>> V  [libjvm.so+0x1d41cda]  void ObjectSynchronizer::fast_exit(oopDesc*,BasicLock*,Thread*)+0x38a
>> V  [libjvm.so+0x1d41fba]  void ObjectSynchronizer::slow_exit(oopDesc*,BasicLock*,Thread*)+0x2a
>> V  [libjvm.so+0x1caa13f]  void SharedRuntime::complete_monitor_unlocking_C(oopDesc*,BasicLock*)+0x27f
>> J 13 C2 java.util.Hashtable.get(Ljava/lang/Object;)Ljava/lang/Object; (69 bytes) @ 0xffff80ffb979da84 [0xffff80ffb979d700+0x384]
>> J 10% C2 Test.Worker()V (381 bytes) @ 0xffff80ffb97a1c8c [0xffff80ffb97a1840+0x44c]
>> j  Test$1.run()V+0
>> v  ~StubRoutines::call_stub
>> V  [libjvm.so+0x177d196]  void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x886
>> V  [libjvm.so+0x1b9a6c8]  void os::os_exception_wrapper(void(*)(JavaValue*,methodHandle*,JavaCallArguments*,Thread*),JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x38
>> V  [libjvm.so+0x177c90a]  void JavaCalls::call(JavaValue*,methodHandle,JavaCallArguments*,Thread*)+0x9a
>> V  [libjvm.so+0x177be70]  void JavaCalls::call_virtual(JavaValue*,KlassHandle,Symbol*,Symbol*,JavaCallArguments*,Thread*)+0x250
>> V  [libjvm.so+0x177bf56]  void JavaCalls::call_virtual(JavaValue*,Handle,KlassHandle,Symbol*,Symbol*,Thread*)+0x66
>> V  [libjvm.so+0x1896897]  void thread_entry(JavaThread*,Thread*)+0xc7
>> V  [libjvm.so+0x1d8f23e]  void JavaThread::thread_main_inner()+0x18e
>> V  [libjvm.so+0x1d8f09a]  void JavaThread::run()+0x1fa
>> V  [libjvm.so+0x1b8f3c8]  java_start+0x248
>> C  [libc.so.1+0x122105]  _thrp_setup+0xa5
>> C  [libc.so.1+0x1223b0]  _lwp_start+0x0
>