svn commit: r218970 - in head/sys: compat/linux sys

[Chagin Dmitry]

On Sat, Mar 05, 2011 at 08:02:44PM +0100, Lucius Windschuh wrote:
> Hi John, hi Dmitry.
> 
> 2011/2/23 John Baldwin <jhb at freebsd.org>:
> > New Revision: 218970
> > [...]
> > Log:
> >  Use umtx_key objects to uniquely identify futexes.  Private futexes in
> >  different processes that happen to use the same user address in the
> >  separate processes will now be treated as distinct futexes rather than the
> >  same futex.  We can now honor shared futexes properly by mapping them to a
> >  PROCESS_SHARED umtx_key.  Private futexes use THREAD_SHARED umtx_key
> >  objects.
> 
> This change breaks linux-jdk-1.6.0, at least for me on FreeBSD 9 i386:
> 
> $ /usr/local/linux-sun-jdk1.6.0/bin/java
> Usage: java [-options] class [args...]
>            (to execute a class)
>    or  java [-options] -jar jarfile [args...]
>            (to execute a jar file)
> 
> where options include:
>     -d32          use a 32-bit data model if available
> 
>     -d64          use a 64-bit data model if available
>     -client       to select the "client" VM
>     -server       to select the "server" VM
>     -hotspot      is a synonym for the "client" VM  [deprecated]
>                   The default VM is server,
>                   because you are running on a server-class machine.
> 
>     -cp <class search path of directories and zip/jar files>
>     -classpath <class search path of directories and zip/jar files>
>                   A : separated list of directories, JAR archives,
>                   and ZIP archives to search for class files.
>     -D<name>=<value>
>                   set a system property
>     -verbose[:class|gc|jni]
>                   enable verbose output
>     -version      print product version and exit
>     -version:<value>
>                   require the specified version to run
>     -showversion  print product version and continue
>     -jre-restrict-search | -jre-no-restrict-search
>                   include/exclude user private JREs in the version search
>     -? -help      print this help message
>     -X            print help on non-standard options
>     -ea[:<packagename>...|:<classname>]
>     -enableassertions[:<packagename>...|:<classname>]
>                   enable assertions
>     -da[:<packagename>...|:<classname>]
>     -disableassertions[:<packagename>...|:<classname>]
>                   disable assertions
>     -esa | -enablesystemassertions
>                   enable system assertions
>     -dsa | -disablesystemassertions
>                   disable system assertions
>     -agentlib:<libname>[=<options>]
>                   load native agent library <libname>, e.g. -agentlib:hprof
>                     see also, -agentlib:jdwp=help and -agentlib:hprof=help
>     -agentpath:<pathname>[=<options>]
>                   load native agent library by full pathname
>     -javaagent:<jarpath>[=<options>]
>                   load Java programming language agent, see java.lang.instrument
>     -splash:<imagepath>
>                   show splash screen with specified image
> ^T
> load: 1.62  cmd: java 4007 [futex] 3.33r 0.00u 0.00s 0% 10784k
> (... wait a while)
> ^T
> load: 1.62  cmd: java 4007 [futex] 4.45r 0.00u 0.00s 0% 10784k
> (... doesn't finish)
> 
> With r218969, the process finishes as expected.
> 
> BTW, is there an easy way to debug such futex issues, other than
> perhaps linux_kdump?
> 

try r219242. kdump now (in HEAD) decode linux syscalls. also see ktr(4).

-- 
Have fun!
chd
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