Not sure this is the right place to ask this question, but I am going to give it a try.
We are seeing some JVM crashes in libc malloc()/free() invoked from libdcpr.so with Java 6. After browsing the bug database there are a few similar ones as described in 6510993 and 6645511. I used the SwingSet2 example from 6510993 as the benchmark and I usually can reproduce the crash within a couple hours, but for some reason the crash is simply not reproducible with openjdk7. With server VM build 1.6.0-b105 the stack trace in the core file looks like the following: #0 0xffffe410 in __kernel_vsyscall () #1 0x4bdce9a1 in raise () from /lib/tls/i686/cmov/libc.so.6 #2 0x4bdd02b9 in abort () from /lib/tls/i686/cmov/libc.so.6 #3 0x0643b36b in os::abort () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so #4 0x0651c431 in VMError::report_and_die () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so #5 0x0643f7a0 in JVM_handle_linux_signal () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so #6 0x0643d058 in signalHandler () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/server/libjvm.so #7 <signal handler called> #8 0x4be0863b in malloc_consolidate () from /lib/tls/i686/cmov/libc.so.6 #9 0x4be09653 in _int_malloc () from /lib/tls/i686/cmov/libc.so.6 #10 0x4be0b411 in malloc () from /lib/tls/i686/cmov/libc.so.6 #11 0xb263a1c5 in doeMem_malloc () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/libdcpr.so #12 0xb2643c61 in setOutputArea () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/libdcpr.so #13 0xb263cdf4 in Java_sun_dc_pr_PathFiller_setOutputArea () from /auto/buildtools/java/jdk1.6.0/jre/lib/i386/libdcpr.so I checked the openjdk7 code structure and found that heavy redesign seems happening under sun/dc, as everything below pr is simply gone. That makes me believe that whatever the problem is on Java 6 it is likely to be related to the implementation under pr. Here comes my main question: for people who rewrite sun/dc for openjdk7, do you happen to know any patch to workaround the crashes in Java 6? We are happy to try any patch to eliminate the annoying JVM crashes. Thanks, -Ben
