Hotspot segfaulting on Linux SPARC

[Aleksey Shipilev]

I would say dig here:

On 04/06/2018 03:02 PM, John Paul Adrian Glaubitz wrote:
> #20 0xffff8001010e5d74 in report_vm_error (file=0xffff800101f3fd58  detail_fmt=0xffff800101f3fd00 "Thread::current() called on detached thread") at
> #21 0xffff800101a48fc0 in Thread::current () at /srv/openjdk/hs/src/hotspot/share/runtime/thread.hpp:720
> #22 ResourceMark::ResourceMark (this=0xffff800102638600) at /srv/openjdk/hs/src/hotspot/share/memory/resourceArea.hpp:109
> #23 verify_memory (ptr=ptr at entry=0xffff80010400fda0) at /srv/openjdk/hs/src/hotspot/share/runtime/os.cpp:632
> #24 0xffff800101a4ea74 in os::free (memblock=0xffff80010400fda0) at /srv/openjdk/hs/src/hotspot/share/runtime/os.cpp:783
> #25 0xffff800101ee9df0 in CPUinfo::~CPUinfo (this=0xffff800102638888, __in_chrg=<optimized out>) at /srv/openjdk/hs/src/hotspot/os_cpu/linux_sparc/vm_version_linux_sparc.cpp:59
> #26 VM_Version::platform_features () at /srv/openjdk/hs/src/hotspot/os_cpu/linux_sparc/vm_version_linux_sparc.cpp:184
> #27 0xffff800101eea080 in VM_Version::determine_features () at
> #28 0xffff800101da1ed0 in Threads::create_vm (args=args at entry=0xffff800102638d78, canTryAgain=canTryAgain at entry=0xffff800102638c57) at /srv/openjdk/hs/src/hotspot/share/runtime/thread.cpp:3637
> #29 0xffff800101570a78 in JNI_CreateJavaVM_inner (args=0xffff800102638d78, penv=0xffff800102638d70, vm=0xffff800102638d68) at /srv/openjdk/hs/src/hotspot/share/prims/jni.cpp:3929
> #30 JNI_CreateJavaVM (vm=0xffff800102638d68, penv=0xffff800102638d70, args=0xffff800102638d78) at /srv/openjdk/hs/src/hotspot/share/prims/jni.cpp:4024
> #31 0xffff8001003bfa74 in InitializeJVM (ifn=<synthetic pointer>, penv=0xffff800102638d70, pvm=0xffff800102638d68) at /srv/openjdk/hs/src/java.base/share/native/libjli/java.c:1478
> #32 JavaMain (_args=<optimized out>) at /srv/openjdk/hs/src/java.base/share/native/libjli/java.c:411
> #33 0xffff8001002a3874 in start_thread (arg=0xffff800102639910) at pthread_create.c:463
> #34 0xffff8001006bf140 in __thread_start () at ../sysdeps/unix/sysv/linux/sparc/sparc64/clone.S:78
> Backtrace stopped: previous frame identical to this frame (corrupt stack?) 

I think this means we are trying to use Resource area before the thread is fully initialized. IIRC
that is forbidden. Looking at os::verify_memory:

static void verify_memory(void* ptr) { // <--- frame #23
  GuardedMemory guarded(ptr);
  if (!guarded.verify_guards()) {
    LogTarget(Warning, malloc, free) lt;
    ResourceMark rm; // <--- frame #22
    LogStream ls(lt);
    ls.print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT...
    ls.print_cr("## memory stomp:");
    guarded.print_on(&ls);
    fatal("memory stomping error");
  }
}

It seems we have *failed* the guarded memory check, entered the branch, and then failed reporting
the failure. This must mean buffer overrun somewhere?

Thanks,
-Aleksey