RFR: 8246405: Add GCLogPrecious functionality to log and report debug errors

Stefan Karlsson stefan.karlsson at oracle.com
Wed Jun 3 09:24:22 UTC 2020


Thanks, Per!

StefanK

On 2020-06-03 11:17, Per Liden wrote:
> Looks good!
>
> /Per
>
> On 6/3/20 10:42 AM, Stefan Karlsson wrote:
>> Hi all,
>>
>> Please review this patch to enhance the GCLogPrecious functionality 
>> (JDK-8246405) to add support for a way to both log and generate a 
>> crash report in debug builds.
>>
>> https://cr.openjdk.java.net/~stefank/8246405/webrev.01/
>> https://bugs.openjdk.java.net/browse/JDK-8246405
>>
>> I've split out a patch where ZGC uses this functionality:
>>
>> https://cr.openjdk.java.net/~stefank/8246406/webrev.01/
>> https://bugs.openjdk.java.net/browse/JDK-8246406
>>
>> Tested manually by running:
>> (ulimit -v >low value>; ../build/fastdebug/jdk/bin/java -XX:+UseZGC 
>> -Xmx18m -Xlog:gc* -version)
>>
>> and verified that it generates a hs_err file with the appropriate 
>> information.
>>
>> On macOS the output points to the right file and line number:
>>
>> #  Internal Error (src/hotspot/share/gc/z/zVirtualMemory.cpp:46), 
>> pid=67695, tid=8451
>> #  Error: Failed to reserve enough address space for Java heap
>>
>> but since TOUCH_ASSERT_POISON isn't implemented we don't get 
>> registers and the output contains the GCLogPrecious code:
>>
>> V  [libjvm.dylib+0xb3d95c]  VMError::report_and_die(int, char const*, 
>> char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, 
>> char const*, int, unsigned long)+0x670
>> V  [libjvm.dylib+0xb3e083]  VMError::report_and_die(Thread*, void*, 
>> char const*, int, char const*, char const*, __va_list_tag*)+0x47
>> V  [libjvm.dylib+0x334b48]  report_vm_error(char const*, int, char 
>> const*, char const*, ...)+0x145
>> V  [libjvm.dylib+0x48d629] 
>> GCLogPrecious::vwrite_and_debug(LogTargetHandle, char const*, 
>> __va_list_tag*, char const*, int)+0x81
>> V  [libjvm.dylib+0xbbdf70] GCLogPreciousHandle::write_and_debug(char 
>> const*, ...)+0x92
>> V  [libjvm.dylib+0xbd833e] 
>> ZVirtualMemoryManager::ZVirtualMemoryManager(unsigned long)+0xb6
>>
>> On Linux, where TOUCH_ASSERT_POISON is implemented, we get the last 
>> parts cut away:
>>
>> V  [libjvm.so+0x1857179] 
>> ZVirtualMemoryManager::ZVirtualMemoryManager(unsigned long)+0x79
>> V  [libjvm.so+0x182f84e] ZPageAllocator::ZPageAllocator(ZWorkers*, 
>> unsigned long, unsigned long, unsigned long, unsigned long)+0x6e
>> V  [libjvm.so+0x1808b61]  ZHeap::ZHeap()+0x81
>> V  [libjvm.so+0x1802559]  ZCollectedHeap::ZCollectedHeap()+0x49
>>
>> Thanks,
>> StefanK



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