Hi, I try to verify the JNA with concurrent situation but meet some problems. The following is my example code: public static void testcase1() throws LibvirtException { Connect conn=null; Connect conn1=null; //connect to the hypervisor conn = new Connect("esx://10.74.125.68:443/?no_verify=1&transport=https", new ConnectAuthDefault(), 0); System.out.println(conn.getVersion()); //connect to the hypervisor conn1 = new Connect("esx://10.74.125.90:443/?no_verify=1&transport=https", new ConnectAuthDefault(), 0); System.out.println(conn1.getVersion()); while(true) { int[] array = new int[100000000]; Long version = conn.getVersion(); Long version1 = conn1.getVersion(); try { Thread.sleep(1000); } catch(Exception e) { } } } When I add line "int[] array = new int[100000000]", then the following error will be generated very quickly: # An unexpected error has been detected by Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003f9b07046e, pid=30049, tid=1109510464 # # Java VM: OpenJDK 64-Bit Server VM (1.6.0-b09 mixed mode linux-amd64) # Problematic frame: # C [libc.so.6+0x7046e] # # An error report file with more information is saved as: I have tried to write the similar code as following. It works well. static void virXenBasic_TC001(void) { virConnectPtr conn = NULL; virConnectPtr conn1 = NULL; unsigned long version = 0; unsigned long version1 = 0; char *hostname = NULL; conn = virConnectOpenAuth("esx://10.74.125.21/?no_verify=1", virConnectAuthPtrDefault, 0); if (conn == NULL) { fprintf(stderr, "Failed to open connection to qemu:///system\n"); return; } conn1 = virConnectOpenAuth("esx://192.168.119.40/?no_verify=1", virConnectAuthPtrDefault, 0); if (conn1 == NULL) { fprintf(stderr, "Failed to open connection to qemu:///system\n"); return; } while(true) { hostname = malloc(sizeof(char) * 100000000); virConnectGetVersion(conn, &version); virConnectGetVersion(conn, &version1); free(hostname); sleep(1); } return; }

public static void testcase1() throws LibvirtException { while(true) { int[] array = new int[100000000]; try { Thread.sleep(1000); } catch(Exception e){} } }

Hi, The problem only occurs in JNA part. The pure c libvirt works well. Even If I only create a connection outside of the loop, the problem can still happen. The following is the easiest problem to reproduce this problem public static void testcase1() throws LibvirtException { Connect conn=null; //connect to the hypervisor conn = new Connect("esx://10.74.125.69:443/?no_verify=1&transport=https", new ConnectAuthDefault(), 0); while(true) { int[] array = new int[100000000]; try { Thread.sleep(1000); } catch(Exception e){} } }

Hi, Actually I also did another test as following. When I comment the "new Connet", the program works well. So this is the problem related to Libvirt JNA. If I manually run the garbage collection for this program, it still works well. But if I run the garbage collection for the last problem, It will crash. I guess this problem is caused by ConnectAuth callback. When garbage collection is executed, the callback memory is moved.