Date: 17 Nov 2007 17:15:12 +0100 From: "Arno J. Klaassen" <arno@heho.snv.jussieu.fr> To: java@freebsd.org Cc: current@freebsd.org Subject: mutex-bug in recent releng_[67]? Message-ID: <wpfxz497cf.fsf@heho.snv.jussieu.fr>
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Hello,
I have serious problems with " Runtime.getRuntime ().exec ()" : either
it hangs or gives a spinning mutex running at 99% cpu.
Attached is a simple code-example which shows the problem : it basically
just launces in iterations a process doing "/bin/ls -lRr /var/"
(the command seems to be important : e.g. ps(1) works fine, ls(1), tar(1),
cpio(1) (all doing fileio ...) fail more or less easiliy)
and then waits for it to exit.
This works OK with linux-sun-jdk15, it fails (most often just hang,
something process ends with exit code 127) on all boxes I could test on :
i686-releng_6-UP / jdk-1.5.0.13p7,1
i686-releng_7-UP / jdk-1.5.0.12p6_2,1
amd64-releng_6-SMP / jdk-1.5.0.12p6_2,1 and jdk-1.5.0.13p7,1
amd64-releng_7-SMP / jdk-1.5.0.13p7,1
I somehow doubt this is really (only) a jdk-problem : it fails (hangs)
as well if I compile it with gcj to an executable (tested both on
i686-releng_6-UP and amd64-releng_7-SMP).
Attached a gdb-log (for releng_7) with shows three threads, two of them
blocking in _umtx_op () (from pthread_cond_init () ), the third
in sigsuspend () (from pthread_getprio () ?).
If I create a core-dump with "gcore -s" all sixteen threads
block in (log attached for the two first threads ) :
#0 0x00000008008cabfc in wait4 () from /lib/libc.so.7
#1 0x000000080075616e in waitpid () from /lib/libthr.so.3
#2 0x0000000801e43030 in Java_java_lang_UNIXProcess_waitForProcessExit (
env=0x82c1a2998, junk=0x7ffffeef1798, pid=906)
I hope someone can help me for this, or should I write a PR?
Thanx very much in adavance.
Arno
--=-=-=
Content-Type: application/octet-stream
Content-Disposition: attachment; filename=Test_proc.java
final class Test_proc
{
Test_proc()
{
for (int i= 0; i < 2; i++)
{
System.out.println("test <" + i + ">: retval is <"
+ fork_shell() + ">");
}
}
private long fork_shell()
{
long ret = -1;
int exit_value = 0;
final String[] cmd = new String[3];
final Process proc;
cmd[0] = "/bin/sh";
cmd[1] = "-c";
cmd[2] = "/bin/ls -lRr /var/";
try
{
proc = Runtime.getRuntime ().exec (cmd);
proc.waitFor ();
if ( (exit_value = proc.exitValue ()) != 0)
{
System.err.println ("ERROR: proc exit value" + exit_value + "!");
}
else ret=0;
}
catch (Exception ex)
{
ret = -2;
ex.printStackTrace(System.err);
}
return ret;
}
public static void main (String[] args) throws Exception
{
new Test_proc ();
}
}
--=-=-=
Content-Type: application/octet-stream
Content-Disposition: attachment; filename=gdb.log
Script started on Sat Nov 17 16:22:55 2007
ivo@push ~/.scito/tmp [49908] > LD_LIBRARY_PATH=/usr/opt/scito/gcc-4.2.2/lib gdb ./Test_proc.exe
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...
(gdb) handle SIGSEGV SIGBUS nostop noprint
Signal Stop Print Pass to program Description
SIGBUS No No Yes Bus error
SIGSEGV No No Yes Segmentation fault
(gdb) r
Starting program: /files/home/ivo/.scito/tmp/Test_proc.exe
[New LWP 100094]
[New Thread 0x803901120 (LWP 100094)]
[New Thread 0x803901290 (LWP 100127)]
[New Thread 0x803901400 (LWP 100132)]
^C
Program received signal SIGINT, Interrupt.
[Switching to Thread 0x803901400 (LWP 100132)]
0x00000008036e6c7c in sigsuspend () from /lib/libc.so.7
(gdb) info thr
* 4 Thread 0x803901400 (LWP 100132) 0x00000008036e6c7c in sigsuspend ()
from /lib/libc.so.7
3 Thread 0x803901290 (LWP 100127) 0x00000008036e60fc in _umtx_op ()
from /lib/libc.so.7
2 Thread 0x803901120 (LWP 100094) 0x00000008036e60fc in _umtx_op ()
from /lib/libc.so.7
(gdb) thr 4
[Switching to thread 4 (Thread 0x803901400 (LWP 100132))]#0 0x00000008036e6c7c in sigsuspend () from /lib/libc.so.7
(gdb) where
#0 0x00000008036e6c7c in sigsuspend () from /lib/libc.so.7
#1 0x0000000803371c6a in sigsuspend () from /lib/libthr.so.3
#2 0x0000000801ce8d16 in java::lang::ConcreteProcess$ProcessManager::waitForSignal (this=Variable "this" is not available.
) at java/lang/natConcreteProcess.cc:142
#3 0x000000080202025d in _ZN4java4lang30ConcreteProcess$ProcessManager3runEJvv
(this=0x599e60) at ConcreteProcess.java:167
#4 0x0000000801cee6a8 in _Jv_ThreadRun (thread=0x599e60)
at ../../../../gcc/libjava/java/lang/natThread.cc:302
#5 0x0000000801cf4b37 in really_start (x=0x5265a0)
at ../../../../gcc/libjava/posix-threads.cc:445
#6 0x00000008024da163 in GC_start_routine (arg=Variable "arg" is not available.
)
at ../../../../gcc/boehm-gc/pthread_support.c:1301
#7 0x000000080336fa76 in pthread_getprio () from /lib/libthr.so.3
#8 0x0000000000000000 in ?? ()
Error accessing memory address 0x7fffff9fe000: Bad address.
(gdb) thr 3
[Switching to thread 3 (Thread 0x803901290 (LWP 100127))]#0 0x00000008036e60fc in _umtx_op () from /lib/libc.so.7
(gdb) where
#0 0x00000008036e60fc in _umtx_op () from /lib/libc.so.7
#1 0x0000000803377049 in pthread_cleanup_push () from /lib/libthr.so.3
#2 0x0000000803375a55 in pthread_cond_init () from /lib/libthr.so.3
#3 0x0000000801cf4ff2 in _Jv_CondWait (cv=0x8031da088, mu=0x8031da070, millis=Variable "millis" is not available.
) at ../../../../gcc/libjava/posix-threads.cc:179
#4 0x0000000801cdfd45 in gnu::gcj::runtime::FinalizerThread::run (this=Variable "this" is not available.
)
at ../../../../gcc/libjava/gnu/gcj/runtime/natFinalizerThread.cc:57
#5 0x0000000801cee6a8 in _Jv_ThreadRun (thread=0x561e00)
at ../../../../gcc/libjava/java/lang/natThread.cc:302
#6 0x0000000801cf4b37 in really_start (x=0x526720)
at ../../../../gcc/libjava/posix-threads.cc:445
#7 0x00000008024da163 in GC_start_routine (arg=Variable "arg" is not available.
)
at ../../../../gcc/boehm-gc/pthread_support.c:1301
#8 0x000000080336fa76 in pthread_getprio () from /lib/libthr.so.3
#9 0x0000000000000000 in ?? ()
Error accessing memory address 0x7fffffbff000: Bad address.
(gdb) thr 2
[Switching to thread 2 (Thread 0x803901120 (LWP 100094))]#0 0x00000008036e60fc in _umtx_op () from /lib/libc.so.7
(gdb) where
#0 0x00000008036e60fc in _umtx_op () from /lib/libc.so.7
#1 0x0000000803377049 in pthread_cleanup_push () from /lib/libthr.so.3
#2 0x0000000803375a55 in pthread_cond_init () from /lib/libthr.so.3
#3 0x0000000801cf4ff2 in _Jv_CondWait (cv=0x578cb0, mu=0x578cb8, millis=Variable "millis" is not available.
)
at ../../../../gcc/libjava/posix-threads.cc:179
#4 0x0000000801ceab37 in java::lang::Object::wait (this=0x1, timeout=0,
nanos=0) at ../../../../gcc/libjava/java/lang/natObject.cc:1333
#5 0x00000008020206d8 in _ZN4java4lang15ConcreteProcess7waitForEJiv (
this=0x59af60) at ConcreteProcess.java:324
#6 0x0000000000401771 in _ZN9Test_proc10fork_shellEJxv (this=0x54ade0)
at Test_proc.java:29
#7 0x0000000000401467 in Test_proc.Test_proc() (this=0x54ade0)
at Test_proc.java:10
#8 0x0000000000401982 in _ZN9Test_proc4mainEJvP6JArrayIPN4java4lang6StringEE (
args=0x52af70) at Test_proc.java:49
#9 0x0000000801ce03c3 in gnu::java::lang::MainThread::call_main (
this=0x599f00) at ../../../../gcc/libjava/gnu/java/lang/natMainThread.cc:50
#10 0x0000000801cee6a8 in _Jv_ThreadRun (thread=0x599f00)
at ../../../../gcc/libjava/java/lang/natThread.cc:302
#11 0x0000000801cb1259 in _Jv_RunMain (vm_args=Variable "vm_args" is not available.
)
at ../../../../gcc/libjava/prims.cc:1574
#12 0x000000000040139a in main (argc=1, argv=0x7fffffffead8)
at /var/tmp//ccGmt6ri.i:11
(gdb) quit
The program is running. Exit anyway? (y or n) y
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--=-=-=
--
Arno J. Klaassen
SCITO S.A.
8 rue des Haies
F-75020 Paris, France
http://scito.com
--=-=-=--
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