La función JVM_FindSignal asigna continuamente memoria nativa
Mi aplicación web java implementada en tomcat8 en una máquina Linux ha estado perdiendo memoria nativa, he intentado detectar la fuente de la fuga utilizando el perfil de jemalloc como se describe aquí:https://github.com/jeffgriffith/native-jvm-leaks Salida de la herramienta de creación de perfiles con un volcado de almacenamiento dinámico en un servidor que se ejecuta durante> 24 horas:
Total: 794708494 B
789734456 99.4% 99.4% 789987533 99.4% JVM_FindSignal
3421211 0.4% 99.8% 3421211 0.4% Java_java_util_zip_ZipFile_getZipMessage
1036965 0.1% 99.9% 1036965 0.1% inflateBackEnd
262784 0.0% 100.0% 262784 0.0% __GI__dl_allocate_tls
253077 0.0% 100.0% 598675182 75.3% SUNWprivate_1.1
0 0.0% 100.0% 938397 0.1% 0x00007fb133688ef8
0 0.0% 100.0% 131136 0.0% 0x00007fb133696c2e
0 0.0% 100.0% 6146839 0.8% 0x00007fb13369b553
0 0.0% 100.0% 135210 0.0% 0x00007fb1336a63f5
0 0.0% 100.0% 131136 0.0% 0x00007fb1336a6403
0 0.0% 100.0% 266290 0.0% 0x00007fb1336a7819
0 0.0% 100.0% 296275 0.0% 0x00007fb1336a7827
0 0.0% 100.0% 139434 0.0% 0x00007fb1336a845a
0 0.0% 100.0% 1221269 0.2% 0x00007fb1336a87e9
0 0.0% 100.0% 663829 0.1% 0x00007fb1336a87f7
0 0.0% 100.0% 148137 0.0% 0x00007fb1336a89f7
0 0.0% 100.0% 143743 0.0% 0x00007fb1336a9068
0 0.0% 100.0% 270421 0.0% 0x00007fb1336ab23d
0 0.0% 100.0% 135210 0.0% 0x00007fb1336ab24b
0 0.0% 100.0% 135210 0.0% 0x00007fb1336ab38b
0 0.0% 100.0% 132613 0.0% 0x00007fb1336cb294
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0 0.0% 100.0% 2012412 0.3% 0x00007fb133929d07
0 0.0% 100.0% 159413372 20.1% 0x00007fb1339be9a5
0 0.0% 100.0% 279249 0.0% 0x00007fb1339e897b
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0 0.0% 100.0% 266346 0.0% 0x00007fb133ab523b
0 0.0% 100.0% 444413 0.1% 0x00007fb133ac8727
0 0.0% 100.0% 4622703 0.6% 0x00007fb133b4c74a
0 0.0% 100.0% 270666 0.0% 0x00007fb133b91ee7
0 0.0% 100.0% 28347870 3.6% 0x00007fb133c61c4a
0 0.0% 100.0% 135210 0.0% 0x00007fb133c94425
0 0.0% 100.0% 3064228 0.4% 0x00007fb133d7c611
0 0.0% 100.0% 131080 0.0% 0x00007fb133dfc067
0 0.0% 100.0% 270421 0.0% 0x00007fb133dfc9f3
0 0.0% 100.0% 136258 0.0% 0x00007fb1340590c9
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0 0.0% 100.0% 136258 0.0% 0x00007fb135807ed1
0 0.0% 100.0% 136258 0.0% 0x00007fb135822eaf
0 0.0% 100.0% 297823 0.0% 0x00007fb135f85154
0 0.0% 100.0% 136258 0.0% 0x00007fb1368a7c42
0 0.0% 100.0% 1313955 0.2% 0x00007fb136e464e5
0 0.0% 100.0% 922058 0.1% 0x00007fb137245e69
0 0.0% 100.0% 408775 0.1% 0x00007fb13734a4aa
0 0.0% 100.0% 1226327 0.2% 0x00007fb13734a4d3
0 0.0% 100.0% 272517 0.0% 0x00007fb137e0760f
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0 0.0% 100.0% 272517 0.0% 0x00007fb137ea88f5
0 0.0% 100.0% 136258 0.0% 0x00007fb137ea8aa4
0 0.0% 100.0% 136258 0.0% 0x00007fb13876c9e9
0 0.0% 100.0% 136258 0.0% 0x00007fb138c0e8f0
0 0.0% 100.0% 272517 0.0% 0x00007fb138dca6f7
0 0.0% 100.0% 272517 0.0% 0x00007fb138dca70c
0 0.0% 100.0% 272517 0.0% 0x00007fb138dcb5ca
0 0.0% 100.0% 136258 0.0% 0x00007fb138f0dba8
0 0.0% 100.0% 136258 0.0% 0x00007fb138fe8f2e
0 0.0% 100.0% 136258 0.0% 0x00007fb13948cd05
0 0.0% 100.0% 136258 0.0% 0x00007fb139ee2f9c
0 0.0% 100.0% 408775 0.1% 0x00007fb13a03f0be
0 0.0% 100.0% 545034 0.1% 0x00007fb13a04e468
0 0.0% 100.0% 272517 0.0% 0x00007fb13a04e64e
0 0.0% 100.0% 136258 0.0% 0x00007fb13a920fca
0 0.0% 100.0% 136258 0.0% 0x00007fb13a92130b
0 0.0% 100.0% 136258 0.0% 0x00007fb13af0b151
0 0.0% 100.0% 136258 0.0% 0x00007fb13b7609a2
0 0.0% 100.0% 136258 0.0% 0x00007fb13b770cb0
0 0.0% 100.0% 408775 0.1% 0x00007fb13bd55409
0 0.0% 100.0% 136258 0.0% 0x00007fb13c062aea
0 0.0% 100.0% 136258 0.0% 0x00007fb13c06419a
0 0.0% 100.0% 136258 0.0% 0x00007fb13d264f22
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0 0.0% 100.0% 408775 0.1% 0x00007fb13d3fb048
0 0.0% 100.0% 698085685 87.8% AsyncGetCallTrace
0 0.0% 100.0% 162799014 20.5% JNI_CreateJavaVM
0 0.0% 100.0% 35102689 4.4% JNI_GetCreatedJavaVMs
0 0.0% 100.0% 131296 0.0% JNU_NewObjectByName
0 0.0% 100.0% 4766447 0.6% JVM_DefineClass
0 0.0% 100.0% 29155153 3.7% JVM_DefineClassWithSource
0 0.0% 100.0% 1204712 0.2% JVM_DoPrivileged
0 0.0% 100.0% 444413 0.1% JVM_FillInStackTrace
0 0.0% 100.0% 266346 0.0% JVM_FindClassFromBootLoader
0 0.0% 100.0% 270421 0.0% JVM_FindClassFromCaller
0 0.0% 100.0% 279249 0.0% JVM_FindLoadedClass
0 0.0% 100.0% 131080 0.0% JVM_GetClassDeclaredConstructors
0 0.0% 100.0% 824436 0.1% JVM_GetClassDeclaredFields
0 0.0% 100.0% 942399 0.1% JVM_GetClassDeclaredMethods
0 0.0% 100.0% 135210 0.0% JVM_GetClassName
0 0.0% 100.0% 159413372 20.1% JVM_InternString
0 0.0% 100.0% 253077 0.0% JVM_LoadLibrary
0 0.0% 100.0% 431231 0.1% JVM_MonitorWait
0 0.0% 100.0% 409855 0.1% JVM_RawMonitorExit
0 0.0% 100.0% 1707451 0.2% JVM_StartThread
0 0.0% 100.0% 714622614 89.9% JVM_handle_linux_signal
0 0.0% 100.0% 253077 0.0% Java_java_lang_ClassLoader_00024NativeLibrary_load
0 0.0% 100.0% 29155153 3.7% Java_java_lang_ClassLoader_defineClass1
0 0.0% 100.0% 266346 0.0% Java_java_lang_ClassLoader_findBootstrapClass
0 0.0% 100.0% 270421 0.0% Java_java_lang_Class_forName0
0 0.0% 100.0% 444413 0.1% Java_java_lang_Throwable_fillInStackTrace
0 0.0% 100.0% 131136 0.0% Java_java_lang_reflect_Proxy_defineClass0
0 0.0% 100.0% 1036965 0.1% Java_java_util_zip_Inflater_inflateBytes
0 0.0% 100.0% 3064228 0.4% Java_java_util_zip_ZipFile_open
0 0.0% 100.0% 131296 0.0% Java_sun_management_Flag_getFlags
0 0.0% 100.0% 356982 0.0% ZIP_Open
0 0.0% 100.0% 3421211 0.4% ZIP_Unlock
0 0.0% 100.0% 569857981 71.7% __clone
0 0.0% 100.0% 253077 0.0% __dlopen_check
0 0.0% 100.0% 262784 0.0% __pthread_create_2_1
0 0.0% 100.0% 253077 0.0% _dl_catch_error
0 0.0% 100.0% 253077 0.0% _dl_init_internal
0 0.0% 100.0% 253077 0.0% _dl_open
0 0.0% 100.0% 253077 0.0% _dlerror_run
0 0.0% 100.0% 253077 0.0% dl_open_worker
0 0.0% 100.0% 253077 0.0% dlopen_doit
0 0.0% 100.0% 393920 0.0% fork1
0 0.0% 100.0% 1036965 0.1% inflate
0 0.0% 100.0% 569857981 71.7% start_thread
Como gráfico:
También he usado la herramienta de seguimiento de memoria nativa de Java para identificar la fugahttps://docs.oracle.com/javase/8/docs/technotes/guides/vm/nmt-8.html El NMT informó que la memoria se filtró en la sección 'Interna'. El gráfico de llamadas sugiere que se llame a JVM_FindSignal como resultado de start_thread, sin embargo, la herramienta de diferencia NMT informó que la cantidad de hilos de aplicación es casi constante y se mantiene en ~ 300.
Opciones de JVM:
-Xms24920m -Xmx24920m -XX:MaxMetaspaceSize=512m -XX:+AlwaysPreTouch
-XX:+UseG1GC -XX:G1HeapWastePercent=10
-XX:+UseTLAB
-XX:+ScavengeBeforeFullGC -verbose:gc
-XX:+PrintGCDetails
-XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution
-XX:+PrintGCApplicationConcurrentTime
-XX:+PrintGCApplicationStoppedTime
-Djava.rmi.server.hostname=XXXXX
-Dcom.sun.management.jmxremote.port=XXXXX
-Dcom.sun.management.jmxremote.ssl=false
Entonces, JVM_FindSignal ha asignado y no liberado 789 Megabytes de memoria nativa, ¿alguien tiene una idea de lo que hace JVM_FindSignal y por qué estaría asignando memoria continuamente?