I have found one fundamental design flow in implementation of: hythread_suspend_other() hythread_suspend_all()
The functions should be called only from suspend enabled state, because the should be itself a valid point of suspension to prevent deadlocks. The other problem is: hythread_suspend_other() should also utilize hythread_global_lock() as the hythread_suspend_all() do via hythread_iterator_create(), otherwise this two functions can deadlock either. I have made a patch, but the assertion for suspend_disable_count fails almost in every test. I'm continue hunting the bug. -- Ivan On 9/20/06, Ivan Volosyuk <[EMAIL PROTECTED]> wrote:
Artem, it looks like two thread mutually suspended each other. This is only reproducible when jvmti.patch from the JIRA is applied. -- Ivan On 9/20/06, Ivan Volosyuk <[EMAIL PROTECTED]> wrote: > I have reproduced the problem with the stack trace same as reported by Gregory. > Here is the stack trace of thread starting GC: > > #4 0xb7af84bc in sched_yield () from /lib/libc.so.6 > #5 0xb7bd5efd in hythread_yield () > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_basic.c:296 > #6 0xb7bd8360 in wait_safe_region_event (thread=0x863e470) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_suspend.c:226 > #7 0xb7bd8580 in hythread_suspend_all (t=0xbfce15d4, group=0x0) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_suspend.c:401 > #8 0xb6eb2872 in stop_the_world_root_set_enumeration () > at /home/ivan/svn/drlvm/trunk/vm/vmcore/src/gc/stop_the_world_root_set_enum.cpp:89 > #9 0xb6eb2b89 in vm_enumerate_root_set_all_threads () > at /home/ivan/svn/drlvm/trunk/vm/vmcore/src/gc/stop_the_world_root_set_enum.cpp:141 > #10 0xb6c845aa in enumerate_universe () > at /home/ivan/svn/drlvm/trunk/vm/gc/src/collect.cpp:127 > #11 0xb6c8584a in force_gc () at > /home/ivan/svn/drlvm/trunk/vm/gc/src/collect.cpp:363 > #12 0xb6c9503b in select_force_gc () > at /home/ivan/svn/drlvm/trunk/vm/gc/src/selector.cpp:287 > #13 0xb6c9007e in gc_force_gc () > at /home/ivan/svn/drlvm/trunk/vm/gc/src/gc_for_vm.cpp:336 > #14 0xb6e289e1 in Java_java_lang_VMMemoryManager_runGC () > > Two other threads: > #3 0xb7be9704 in tm_tls_size () > from /home/ivan/svn/drlvm/trunk/build/lnx_ia32_gcc_debug/deploy/jre/bin/default/libhythr.so > #4 0xb7af84bc in sched_yield () from /lib/libc.so.6 > #5 0xb7bd5efd in hythread_yield () > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_basic.c:296 > #6 0xb7bd8360 in wait_safe_region_event (thread=0x805ce50) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_suspend.c:226 > #7 0xb7bd83e0 in hythread_suspend_other (thread=0x805ce50) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_suspend.c:286 > #8 0xb7bd8b22 in unreserve_lock (lockword_ptr=0xa65da07c) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_thin_monitor.c:168 > #9 0xb7bd8ece in hythread_thin_monitor_try_enter (lockword_ptr=0xa65da07c) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_thin_monitor.c:313 > > > #4 0xb7b792be in __lll_mutex_lock_wait () from /lib/libpthread.so.0 > #5 0xb7b76074 in _L_mutex_lock_150 () from /lib/libpthread.so.0 > #6 0xb7fdb290 in fixup () from /lib/ld-linux.so.2 > #7 0xb7bd79e4 in hymutex_lock (mutex=0x805d150) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_mutex.c:71 > #8 0xb7bd6d29 in hythread_monitor_enter (mon_ptr=0x805d118) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_fat_monitor.c:95 > #9 0xb7fc2fef in asynchSignalReporter () > from /home/ivan/svn/drlvm/trunk/build/lnx_ia32_gcc_debug/deploy/jre/bin/libhyprt.so > #10 0xb7bd67ca in thread_start_proc (thd=0x805f380, p_args=0x805f2e8) > at /home/ivan/svn/drlvm/trunk/vm/thread/src/thread_native_basic.c:704 > #11 0xb7bdd386 in dummy_worker (opaque=0xfffffffc) at thread.c:138 > #12 0xb7b74420 in start_thread () from /lib/libpthread.so.0 > #13 0xb7b0e39e in clone () from /lib/libc.so.6
-- Ivan Intel Middleware Products Division --------------------------------------------------------------------- Terms of use : http://incubator.apache.org/harmony/mailing.html To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
