FreeBSD pl/java problem : backend hangs

[Ronald Klop]

I have no experience running java as a backend of pgsql.
Can you run jstack on the backend?

Ronald.

On Mon, 04 Feb 2013 14:17:22 +0100, Achilleas Mantzios  
<achill at matrix.gatewaynet.com> wrote:

> Hello community,
>
> I am running postgresql 9.2.2 with
> openjdk version "1.6.0_32"
> OpenJDK Runtime Environment (build 1.6.0_32-b25)
> OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
> On FreeBSD 8.3-RELEASE
>
> I am having trouble even running simple tests like :
> CREATE FUNCTION getsysprop(VARCHAR)
>   RETURNS VARCHAR
>   AS 'java.lang.System.getProperty'
>   LANGUAGE java;
>
> SELECT getsysprop('user.home');
>
> When i do that, the session hangs, and have to kill -9 the backend.
>
> Searching with truss got :
>
> gettimeofday({1359983241.596250 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596275 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596300 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596327 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596352 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596378 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596403 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596431 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596458 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596482 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596507 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596532 },0x0)           = 0 (0x0)
> gettimeofday({1359983241.596556 },0x0)           = 0 (0x0)
> _umtx_op(0x7fffffffc7e8,0x3,0x1,0x0,0x0,0x1)     = 0 (0x0)
> sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGABRT|SIGEMT|SIGKILL|SIGSYS|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)  
> = 0 (0x0)
> sigprocmask(SIG_SETMASK,0x0,0x0)                 = 0 (0x0)
> sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGABRT|SIGEMT|SIGKILL|SIGSYS|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)  
> = 0 (0x0)
> sigprocmask(SIG_SETMASK,0x0,0x0)                 = 0 (0x0)
>
> while ktrace gave :
>
>  98910 initial thread CALL  gettimeofday(0x7fffffffc900,0)
>  98910 initial thread RET   gettimeofday 0
>  98910 initial thread CALL  gettimeofday(0x7fffffffc900,0)
>  98910 initial thread RET   gettimeofday 0
>  98910 initial thread CALL  gettimeofday(0x7fffffffc900,0)
>  98910 initial thread RET   gettimeofday 0
>  98910 initial thread CALL  gettimeofday(0x7fffffffc900,0)
>  98910 initial thread RET   gettimeofday 0
>  98910 initial thread CALL  gettimeofday(0x7fffffffc940,0)
>  98910 initial thread RET   gettimeofday 0
>  98910 initial thread CALL  _umtx_op(0x7fffffffc7e8,0x3,0x1,0,0)
>  98910 initial thread RET   _umtx_op 0
>  98910 initial thread CALL   
> sigprocmask(SIG_BLOCK,0x7fffffffc780,0x8016167d8)
>  98910 initial thread RET   sigprocmask 0
>  98910 initial thread CALL  sigprocmask(SIG_SETMASK,0x8016167d8,0)
>  98910 initial thread RET   sigprocmask 0
>  98910 initial thread CALL   
> sigprocmask(SIG_BLOCK,0x7fffffffc6e0,0x8016167d8)
>  98910 initial thread RET   sigprocmask 0
>  98910 initial thread CALL  sigprocmask(SIG_SETMASK,0x8016167d8,0)
>  98910 initial thread RET   sigprocmask 0
>  98910 initial thread CALL  _umtx_op(0x8f8dc4280,0x11,0,0,0)
>
> I found some relevant problems with FreeBSD systems hanging after an  
> _umtx_op but all those point
> to threading problems that now are solved. I found nothing modern about  
> _umtx_op.
>
> I know FreeBSD is not a "Tier-1" platform for postgresql (nor java), but  
> this is my main platform and i'd like
> to stick with this.
>
> Is there anything i could do to get closer to make pl/java work with  
> FreeBSD?
>
> Also read this  
> http://postgresql.1045698.n5.nabble.com/Java-VM-stalls-during-quot-install-jar-quot-td3290754.html  
> thread.
> Very close to my situation. JNI standalone also worked for me.
>
> Any hints/pointers ?
>
> -
> Achilleas Mantzios
> IT DEV
> IT DEPT
> Dynacom Tankers Mgmt
> _______________________________________________
> freebsd-java at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-java
> To unsubscribe, send any mail to "freebsd-java-unsubscribe at freebsd.org"