Hotspot segfaulting on Linux SPARC

[Zhengyu Gu]

>  From the crash report:
> 
> #19 0xffff800101e74cc0 in VMError::report_and_die (thread=0x0, 
> context=context at entry=0x0, filename=filename at entry=0xffff800101f3fd58 
> "/srv/openjdk/hs/src/hotspot/share/runtime/thread.hpp", 
> lineno=lineno at entry=720,
>      message=message at entry=0xffff800101f3fd30 "assert(current != __null) 
> failed", detail_fmt=detail_fmt at entry=0xffff800101f3fd00 
> "Thread::current() called on detached thread", detail_args=<optimized 
> out>) at /srv/openjdk/hs/src/hotspot/share/utilities/vmError.cpp:1244
> #20 0xffff8001010e5d74 in report_vm_error (file=0xffff800101f3fd58 
> "/srv/openjdk/hs/src/hotspot/share/runtime/thread.hpp", 
> line=line at entry=720, error_msg=0xffff800101f3fd30 "assert(current != 
> __null) failed",
>      detail_fmt=0xffff800101f3fd00 "Thread::current() called on detached 
> thread") at /srv/openjdk/hs/src/hotspot/share/utilities/debug.cpp:230
> #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 
> 
> 
> The use of the os* functions can lead us into code that uses 
> ResourceMark and requires an attached thread.

Ah, I would argue that we should not get to this crash to begin with :-)

Thanks,

-Zhengyu

> 
> David
> -----
> 
>>
>> Thanks,
>>
>> -Zhengyu
>>
>>>
>>> David
>>>
>>>> -Zhengyu
>>>>
>>>>
>>>> On 04/06/2018 09:12 AM, Aleksey Shipilev wrote:
>>>>> 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
>>>>>