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https://issues.apache.org/jira/browse/SOLR-10553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115867#comment-16115867
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Kevin Risden commented on SOLR-10553:
-------------------------------------

[~ben.manes] - I think you are the right person to ping on this. I saw you were 
pretty active w/ other Caffeine related items. 

> Caffeine causes SIGSEGV in Solr tests
> -------------------------------------
>
>                 Key: SOLR-10553
>                 URL: https://issues.apache.org/jira/browse/SOLR-10553
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Uwe Schindler
>            Priority: Critical
>
> While running the Solr tests, the JVM often crushes with SIGSEGV. The reason 
> is Caffeine's usage of Unsafe. Please open an issue on this lib or remove 
> this library.
> I looked at Caffeine's usage of Unsafe: IT IS TOTALLY USELESS!
> See this log: 
> https://jenkins.thetaphi.de/job/Lucene-Solr-6.x-Linux/3347/artifact/solr/build/solr-core/test/J2/hs_err_pid17108.log
> {noformat}
> Current thread (0xbf7af000):  JavaThread "Thread-4" [_thread_in_Java, 
> id=17265, stack(0xc342e000,0xc347f000)]
> Stack: [0xc342e000,0xc347f000],  sp=0xc347dba0,  free space=318k
> Native frames: (J=compiled Java code, A=aot compiled Java code, 
> j=interpreted, Vv=VM code, C=native code)
> J 5565% c1 
> com.github.benmanes.caffeine.cache.BaseMpscLinkedArrayQueue.poll()Ljava/lang/Object;
>  (108 bytes) @ 0xe7ae7848 [0xe7ae6e20+0x00000a28]
> j  com.github.benmanes.caffeine.cache.BoundedLocalCache.drainWriteBuffer()V+21
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.maintenance(Ljava/lang/Runnable;)V+10
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.performCleanUp(Ljava/lang/Runnable;)V+11
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache$PerformCleanupTask.run()V+5
> j  
> org.apache.solr.store.blockcache.BlockCache$$Lambda$278.execute(Ljava/lang/Runnable;)V+1
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.scheduleDrainBuffers()V+54
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.scheduleAfterWrite()V+44
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.afterWrite(Lcom/github/benmanes/caffeine/cache/Node;Ljava/lang/Runnable;J)V+47
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.put(Ljava/lang/Object;Ljava/lang/Object;ZZ)Ljava/lang/Object;+209
> j  
> com.github.benmanes.caffeine.cache.BoundedLocalCache.put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;+5
> j  
> com.github.benmanes.caffeine.cache.LocalManualCache.put(Ljava/lang/Object;Ljava/lang/Object;)V+8
> j  
> org.apache.solr.store.blockcache.BlockCache.store(Lorg/apache/solr/store/blockcache/BlockCacheKey;I[BII)Z+176
> j  org.apache.solr.store.blockcache.BlockCacheTest$1.test()V+331
> j  org.apache.solr.store.blockcache.BlockCacheTest$1.test(I)V+8
> j  org.apache.solr.store.blockcache.BlockCacheTest$1.run()V+47
> v  ~StubRoutines::call_stub
> V  [libjvm.so+0x65f759]  JavaCalls::call_helper(JavaValue*, methodHandle 
> const&, JavaCallArguments*, Thread*)+0x319
> V  [libjvm.so+0x910889]  os::os_exception_wrapper(void (*)(JavaValue*, 
> methodHandle const&, JavaCallArguments*, Thread*), JavaValue*, methodHandle 
> const&, JavaCallArguments*, Thread*)+0x19
> V  [libjvm.so+0x65e093]  JavaCalls::call_virtual(JavaValue*, Handle, 
> KlassHandle, Symbol*, Symbol*, Thread*)+0x163
> V  [libjvm.so+0x6ee089]  thread_entry(JavaThread*, Thread*)+0x89
> V  [libjvm.so+0xa747d4]  JavaThread::thread_main_inner()+0xf4
> V  [libjvm.so+0x912e5c]  thread_native_entry(Thread*)+0x10c
> C  [libpthread.so.0+0x6f72]  start_thread+0xd2
> C  [libc.so.6+0xee2ae]  clone+0x5e
> siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr: 0x8d0ffbb0
> Register to memory mapping:
> EAX=0x00000040 is an unknown value
> EBX=0x00000000 is pointing into the stack for thread: 0xbf7ddc00
> ECX=0x00000000 is pointing into the stack for thread: 0xbf7ddc00
> EDX=0xc9a00918 is pointing into object: 0xc9a004f8
> [error occurred during error reporting (printing register info), id 0xb]
> Registers:
> EAX=0x00000040, EBX=0x00000000, ECX=0x00000000, EDX=0xc9a00918
> ESP=0xc347dba0, EBP=0xc347dcf0, ESI=0xc9c81ee8, EDI=0xc347dcc8
> EIP=0xe7ae7848, EFLAGS=0x00010246, CR2=0x000000008d0ffbb0
> Top of Stack: (sp=0xc347dba0)
> 0xc347dba0:   00000038 bebd16c0 c347dbf8 f702a6f9
> 0xc347dbb0:   e6c031c0 00000028 00000004 c347dc24 
> Instructions: (pc=0xe7ae7848)
> 0xe7ae7828:   f0 58 0f be b6 e4 01 00 00 83 fe 00 8b bc 24 f8
> 0xe7ae7838:   00 00 00 8b b4 24 98 00 00 00 0f 85 cc 06 00 00
> 0xe7ae7848:   89 0c 3e 8d 34 3e 8b fe 33 f9 c1 ef 14 83 ff 00
> 0xe7ae7858:   0f 85 cf 06 00 00 f0 83 44 24 c0 00 8b 8c 24 f4 
> {noformat}
> The reson for this crash is wrong integer calculations while calculating 
> offsets.
> I have seen several Unsafe-related crashes the last weeks. All coming from 
> Caffeine. So please, please, please: Remove that lib or ask them to remove 
> Unsafe!



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