[Bug libgcj/51615] New: Condition Variable queue state corruption and infinite loop

[nwfilardo at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51615

             Bug #: 51615
           Summary: Condition Variable queue state corruption and infinite
                    loop
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcj
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: nwfilardo@gmail.com


When attempting to run ecj-3.8M4.jar on a large number of files, gij hangs. 
(On a small number of files, it runs fine, curiously enough.)

Invoking gdb (7.3.1), I see that the thread is stuck in
(gdb) bt
#0  _Jv_CondWait (cv=0x1729a48, mu=<optimized out>, millis=<optimized out>,
nanos=<optimized out>)
    at ../.././../gcc-4.7-20111210/libjava/posix-threads.cc:241
#1  0x00000000419d99b8 in java::lang::Object::wait (this=0x1704900,
timeout=250, 
    nanos=<optimized out>) at
../.././../gcc-4.7-20111210/libjava/java/lang/natObject.cc:226
#2  0x0000000042486aa4 in ffi_call_v9 () at
../.././../gcc-4.7-20111210/libffi/src/sparc/v9.S:83
#3  0x0000000042486400 in ffi_call (cif=0x1815f08, fn=<optimized out>,
rvalue=0x7fdff7f97e8, 
    avalue=0x7fdff7f9680) at
../.././../gcc-4.7-20111210/libffi/src/sparc/ffi.c:415
#4  0x00000000424830c8 in ffi_java_raw_call (cif=<optimized out>, fn=<optimized
out>, 
    rvalue=<optimized out>, raw=<optimized out>)
    at ../.././../gcc-4.7-20111210/libffi/src/java_raw_api.c:300
#5  0x00000000419b6430 in _Jv_InterpMethod::run (retp=0x7fdff7f9aa0,
args=0x419b6d9c, meth=0x13a0c00)
    at ../.././../gcc-4.7-20111210/libjava/interpret-run.cc:613
#6  0x0000000042483028 in ffi_java_translate_args (cif=<optimized out>,
rvalue=<optimized out>, 
    avalue=<optimized out>, user_data=<optimized out>)
    at ../.././../gcc-4.7-20111210/libffi/src/java_raw_api.c:314
#7  0x00000000424867e0 in ffi_closure_sparc_inner_v9 (closure=<optimized out>,
rvalue=0x7fdff7f9aa0, 
    gpr=0x7fdff7f9bc0, fpr=0x7fdff7f9ac0) at
../.././../gcc-4.7-20111210/libffi/src/sparc/ffi.c:621
#8  0x0000000042486b90 in ffi_closure_v9 () at
../.././../gcc-4.7-20111210/libffi/src/sparc/v9.S:181
#9  0x0000000041dd2ce8 in java.lang.Thread.run()void (this=<optimized out>)
    at
/var/ports/usr/ports/lang/gcc47/work/gcc-4.7-20111210/libjava/java/lang/Thread.java:761
#10 0x00000000419ddbec in _Jv_ThreadRun (thread=<optimized out>)
    at ../.././../gcc-4.7-20111210/libjava/java/lang/natThread.cc:335
#11 0x00000000419e78a8 in really_start (x=<optimized out>)
    at ../.././../gcc-4.7-20111210/libjava/posix-threads.cc:639
#12 0x000000004249950c in GC_start_routine (arg=0x12ca120)
    at ../.././../gcc-4.7-20111210/boehm-gc/pthread_support.c:1301
#13 0x0000000043c68890 in ?? () from /lib/libthr.so.3
#14 0x0000000043c68890 in ?? () from /lib/libthr.so.3

and if I

(gdb) print cv.first
$14 = (_Jv_Thread_t *) 0x446c4830
(gdb) print cv.first.next 
$15 = (_Jv_Thread_t *) 0x446c4830

which is obviously bad since the loop we're stuck in is over ->next pointers
until we see a NULL, which we won't.  Note that current has also become
corrupted in the same way:

(gdb) print current 
$16 = (_Jv_Thread_t *) 0x446c4860
(gdb) print current.next
$17 = (_Jv_Thread_t *) 0x446c4860

I am on a FreeBSD/sparc64 machine, running 8.2 and using gcc47 from ports
(which means exactly 4.7.0 20111210).  It's quite easy to get into this state,
so if I've left something out please don't hesitate to ask.