Truncated stacks

[David Holmes]

We've noticed a problem investigating bug reports involving monitor 
lock/unlock. It seems that the stacks for threads in hs_err reports, in 
jstack -mixed output and even in gdb are truncated very high up e.g.

Stack: [0x00000041adef0000,0x00000041adff0000]
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, 
C=native code)
V [jvm.dll+0xb49bd1] os::platform_print_native_stack+0xf1 
(os_windows_x86.cpp:369)
V [jvm.dll+0xd67860] VMError::report+0xe80 (vmerror.cpp:698)
V [jvm.dll+0xd690b4] VMError::report_and_die+0x854 (vmerror.cpp:1463)
V [jvm.dll+0xd69774] VMError::report_and_die+0x64 (vmerror.cpp:1287)
V [jvm.dll+0x57be7e] report_vm_error+0x7e (debug.cpp:232)
V [jvm.dll+0xb21db4] ObjectMonitor::exit+0xf4 (objectmonitor.cpp:1025)
V [jvm.dll+0xc0f08a] SharedRuntime::complete_monitor_unlocking_C+0x17a 
(sharedruntime.cpp:2062)
C 0x0000004187bfcf5e


or:

Thread 1005 (Thread 0x7f30bb1ff700 (LWP 7275)):
#0  0x00007f30f950d705 in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib64/libpthread.so.0
#1  0x00007f30f7b2d033 in os::PlatformEvent::park() () from 
/scratch/fairoz/JAVA/jdk12/jdk-12-ea+24/lib/server/libjvm.so
#2  0x00007f30f7af7d2d in ObjectMonitor::EnterI(Thread*) () from 
/scratch/fairoz/JAVA/jdk12/jdk-12-ea+24/lib/server/libjvm.so
#3  0x00007f30f7af9a62 in ObjectMonitor::enter(Thread*) [clone .part.90] 
() from /scratch/fairoz/JAVA/jdk12/jdk-12-ea+24/lib/server/libjvm.so
#4  0x00007f30f7c9bcd2 in ObjectSynchronizer::fast_enter(Handle, 
BasicLock*, bool, Thread*) () from 
/scratch/fairoz/JAVA/jdk12/jdk-12-ea+24/lib/server/libjvm.so
#5  0x00007f30f7c02584 in 
SharedRuntime::complete_monitor_locking_C(oopDesc*, BasicLock*, 
JavaThread*) ()
    from /scratch/fairoz/JAVA/jdk12/jdk-12-ea+24/lib/server/libjvm.so
#6  0x00007f30ddde2228 in ?? ()
#7  0x0000000638200fc8 in ?? ()
#8  0x00007f30e57e1330 in ?? ()
#9  0x00000001000003e8 in ?? ()
#10 0x0000000638200920 in ?? ()
#11 0x000000080113fa80 in ?? ()
#12 0x0000000638200fe8 in ?? ()
#13 0xc70405d300000000 in ?? ()
#14 0x0000000638200fd8 in ?? ()
#15 0x0000000801146328 in ?? ()
#16 0x00000006382014d8 in ?? ()
#17 0x0000000638202e98 in ?? ()
#18 0x0000000638202eb0 in ?? ()
#19 0xc704029b382317f8 in ?? ()
#20 0x0000000000000000 in ?? ()

Anyone have any ideas about what have broken things? I haven't had time 
to try and determine how long this has been occurring.

Thanks,
David