RFR: 8151526: Print -Xlog configuration in the hs_err_pid file
Marcus Larsson
marcus.larsson at oracle.com
Tue Apr 19 06:39:55 UTC 2016
On 04/18/2016 05:24 PM, Max Ockner wrote:
> http://cr.openjdk.java.net/~mockner/8151526.06/
Looks good to me as well!
Thanks,
Marcus
>
> - Renamed describe_no_lock => describe_available
> - Renamed describe_with_lock => describe_current_configuration
> - Removed unnecessary import of vmError in logConfiguration.cpp
> - Fixed typo in comment in logConfiguration.hpp
> - hs_err file now only uses describe_current_configuration, which was
> the original intent of this enhancement. VM info still uses describe().
>
> Thanks,
> Max
>
> On 4/18/2016 9:43 AM, Marcus Larsson wrote:
>>
>>
>> On 04/18/2016 03:33 PM, Coleen Phillimore wrote:
>>>
>>>
>>> On 4/15/16 10:37 AM, Marcus Larsson wrote:
>>>> Hi,
>>>>
>>>> On 04/15/2016 04:29 PM, Coleen Phillimore wrote:
>>>>>
>>>>> Max,
>>>>>
>>>>> I got this confused when looking at this because of the names.
>>>>>
>>>>> *+ STEP(395, "(printing log configuration)")*
>>>>> *+ if (_verbose){*
>>>>> *+ st->print_cr("Logging:");*
>>>>> *+ LogConfiguration::describe_no_lock(st);*
>>>>> *+ LogConfiguration::describe_with_lock(st);*
>>>>> *+ st->cr();*
>>>>> *+ }*
>>>>> *+ *
>>>>>
>>>>> I was thinking "wait, you don't want the lock here!"
>>>>>
>>>>> I think describe_no_lock() should be named
>>>>> describe_available_log_levels()
>>>>>
>>>>> describe_with_lock() should be names describe_log_configuration().
>>>>>
>>>>> describe() should call these with the lock for the latter.
>>>>
>>>> In that case, can we make it describe_available() and
>>>> describe_outputs()? The first function doesn't only describe levels.
>>>
>>> describe_available() seems better. It seems that
>>> describe_outputs() isn't descriptive, why not
>>> describe_[current]_configuration().
>>
>> I just figured we could skip the "configuration" part of it since
>> we're already in the scope of LogConfiguration::. I'm fine with
>> describe_[current]_configuration(), it's no big deal.
>>
>> Thanks,
>> Marcus
>>
>>>
>>> Thanks,
>>> Coleen
>>>>
>>>> Thanks,
>>>> Marcus
>>>>
>>>>>
>>>>> Thanks,
>>>>> Coleen
>>>>>
>>>>>
>>>>> On 4/15/16 3:54 AM, Marcus Larsson wrote:
>>>>>> Hi,
>>>>>>
>>>>>> On 04/14/2016 06:22 PM, Max Ockner wrote:
>>>>>>> new webrev:
>>>>>>> http://cr.openjdk.java.net/~mockner/8151526.05/
>>>>>>
>>>>>> logConfiguration.cpp:
>>>>>> unnecessary #include on line 39
>>>>>>
>>>>>> logConfiguration.hpp:
>>>>>> typo in comment, 'ad' -> 'and'
>>>>>>
>>>>>> I don't need to see a new webrev for this. Thanks for fixing!
>>>>>>
>>>>>> Marcus
>>>>>>
>>>>>>> - new describe_* methods are now private
>>>>>>> - VMError is now a friend class in logConfiguration.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Max
>>>>>>>
>>>>>>> On 4/14/2016 4:30 AM, Marcus Larsson wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> On 04/13/2016 09:33 PM, Max Ockner wrote:
>>>>>>>>> Hello,
>>>>>>>>> I have made these changes.
>>>>>>>>> - refactored describe into a portion which uses locking and
>>>>>>>>> one that does not.
>>>>>>>>> - in the print_vm_info function in vmError.cpp, describe() is
>>>>>>>>> used, since this function is called while the program is running.
>>>>>>>>> - in the report function, the describe_no_lock and
>>>>>>>>> describe_with_lock functions are both used without taking a
>>>>>>>>> lock. If it doesnt crash, then fantastic. If it does crash,
>>>>>>>>> the error handler will skip this step anyway.
>>>>>>>>>
>>>>>>>>> webrev: http://cr.openjdk.java.net/~mockner/8151526.04
>>>>>>>>
>>>>>>>> I suggest making the new two functions private in
>>>>>>>> LogConfiguration, and friending VMError, instead of keeping
>>>>>>>> them public. That should reduce confusion about which
>>>>>>>> describe-method to use, and prevent misuse of the
>>>>>>>> describe_with_lock in other places.
>>>>>>>>
>>>>>>>> Otherwise this looks good.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Marcus
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Max
>>>>>>>>>
>>>>>>>>> On 4/12/2016 1:30 PM, Marcus Larsson wrote:
>>>>>>>>>> Hey,
>>>>>>>>>>
>>>>>>>>>> On 2016-04-12 17:01, Max Ockner wrote:
>>>>>>>>>>> Marcus,
>>>>>>>>>>>
>>>>>>>>>>> I just spoke with Coleen about this. If I attempt to print
>>>>>>>>>>> configuration during a crash without lock and it crashes,
>>>>>>>>>>> the error handler will eat it up and start at the next
>>>>>>>>>>> step. It would be fun to write a locking mechanism, but
>>>>>>>>>>> this seems better to me.
>>>>>>>>>>>
>>>>>>>>>>> I will continue to call describe() from VM.info, but I will
>>>>>>>>>>> refactor the code in describe so that all of the information
>>>>>>>>>>> can be printed easily without taking a lock. For a crash,
>>>>>>>>>>> I'll use the refactored print functions to print all the
>>>>>>>>>>> necessary information without taking a lock. Even if the vm
>>>>>>>>>>> crashes during this step it is not such a bad thing because
>>>>>>>>>>> of the robust error handler.
>>>>>>>>>>
>>>>>>>>>> Alright, that sounds good!
>>>>>>>>>>
>>>>>>>>>> Thanks,
>>>>>>>>>> Marcus
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Max
>>>>>>>>>>>
>>>>>>>>>>> On 4/12/2016 8:46 AM, Marcus Larsson wrote:
>>>>>>>>>>>> Hi Max,
>>>>>>>>>>>>
>>>>>>>>>>>> On 04/11/2016 07:36 PM, Max Ockner wrote:
>>>>>>>>>>>>> Hello again,
>>>>>>>>>>>>>
>>>>>>>>>>>>> I have looked into this and I see a possible workaround to
>>>>>>>>>>>>> the issue raised by Marcus:
>>>>>>>>>>>>>
>>>>>>>>>>>>> LogConfiguration::describe() takes the
>>>>>>>>>>>>> ConfigurationLock, which
>>>>>>>>>>>>> might be problematic for the error handler. I suppose
>>>>>>>>>>>>> the error
>>>>>>>>>>>>> handler could potentially deadlock if its thread
>>>>>>>>>>>>> already holds
>>>>>>>>>>>>> the lock. Unsure how to resolve this, because skipping
>>>>>>>>>>>>> to take
>>>>>>>>>>>>> the lock means that we might crash due to another thread
>>>>>>>>>>>>> changing the configuration as we read it.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> My proposed solution is this:
>>>>>>>>>>>>>
>>>>>>>>>>>>> If the ConfigurationLock is held by another thread during
>>>>>>>>>>>>> the crash, then I think we could print "Log configuration
>>>>>>>>>>>>> can not be accessed because ConfigurationLock is currently
>>>>>>>>>>>>> held by another thread" or something similar. If the
>>>>>>>>>>>>> ConfigurationLock can be taken by the current thread, then
>>>>>>>>>>>>> print the configuration.
>>>>>>>>>>>>>
>>>>>>>>>>>>> We can accomplish this as follows:
>>>>>>>>>>>>>
>>>>>>>>>>>>> In *logConfiguration.cpp*: Create a
>>>>>>>>>>>>> ConfigurationLockMaybe class extending ConfigurationLock.
>>>>>>>>>>>>>
>>>>>>>>>>>>> class ConfigurationLockMaybe : ConfigurationLock {
>>>>>>>>>>>>> private:
>>>>>>>>>>>>> bool _success;
>>>>>>>>>>>>> public:
>>>>>>>>>>>>> ConfigurationLockMaybe() {
>>>>>>>>>>>>> if (_semaphore.trywait()){_success = true;}
>>>>>>>>>>>>> }
>>>>>>>>>>>>> ~ConfigurationLock() {
>>>>>>>>>>>>> if(_success){_semaphore.signal();}
>>>>>>>>>>>>> }
>>>>>>>>>>>>> bool has_lock(){return _success;}
>>>>>>>>>>>>> };
>>>>>>>>>>>>>
>>>>>>>>>>>>> _semaphore is a static var in ConfigurationLock, so the
>>>>>>>>>>>>> same copy is accessed in child classes.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Another method
>>>>>>>>>>>>> LogConfiguration::describe_on_crash(outputStream* out) can
>>>>>>>>>>>>> use ConfigurationLockMaybe to attempt to print the
>>>>>>>>>>>>> configuration.
>>>>>>>>>>>>>
>>>>>>>>>>>>> In *vmError.cpp*: Replace LogConfiguration::describe with
>>>>>>>>>>>>> LogConfiguration::describe_on_crash.
>>>>>>>>>>>>
>>>>>>>>>>>> Sounds good to me.
>>>>>>>>>>>>
>>>>>>>>>>>> ConfigurationLockMaybe sounds a bit weird but I don't have
>>>>>>>>>>>> a better suggestion.
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks,
>>>>>>>>>>>> Marcus
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Max
>>>>>>>>>>>>>
>>>>>>>>>>>>> On 4/11/2016 10:23 AM, Max Ockner wrote:
>>>>>>>>>>>>>> I missed this before. I'm going to investigate.
>>>>>>>>>>>>>> Max
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On 4/11/2016 4:19 AM, Marcus Larsson wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On 04/11/2016 09:00 AM, Thomas Stüfe wrote:
>>>>>>>>>>>>>>>> Hi Max,
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Fri, Apr 8, 2016 at 9:56 PM, Max Ockner
>>>>>>>>>>>>>>>> <max.ockner at oracle.com <mailto:max.ockner at oracle.com>>
>>>>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I forgot to respond to this:
>>>>>>>>>>>>>>>> On 4/1/2016 4:45 AM, Marcus Larsson wrote:
>>>>>>>>>>>>>>>>> Hi,
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> On 03/31/2016 08:08 PM, Max Ockner wrote:
>>>>>>>>>>>>>>>>>> (Replies in line)
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> On 3/30/2016 9:31 AM, Thomas Stüfe wrote:
>>>>>>>>>>>>>>>>>>> Hi Max,
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Disclaimer: not a (R)eviewer.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Do we really need a list of all tags and all
>>>>>>>>>>>>>>>>>>> decorators?
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Just going by what we currently put in the hs_err
>>>>>>>>>>>>>>>>>> file, I think
>>>>>>>>>>>>>>>>>> this may be the first "Do we really need" we've
>>>>>>>>>>>>>>>>>> ever asked for
>>>>>>>>>>>>>>>>>> this type of change.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> All joking aside, I think it is a good idea to
>>>>>>>>>>>>>>>>>> direct users
>>>>>>>>>>>>>>>>>> toward proper UL usage whenever we have a chance.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Also: I assume what you print is the Log state as it
>>>>>>>>>>>>>>>>>>> is at the
>>>>>>>>>>>>>>>>>>> time the hs-err file is printed. If logging was
>>>>>>>>>>>>>>>>>>> enabled/changed during lifetime of the VM, e.g.
>>>>>>>>>>>>>>>>>>> with jcmd,
>>>>>>>>>>>>>>>>>>> would it be possible to see that? At least a
>>>>>>>>>>>>>>>>>>> warning if
>>>>>>>>>>>>>>>>>>> logging was not enabled from the start on.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Would it be possible? Yes, but I think this would
>>>>>>>>>>>>>>>>>> require a
>>>>>>>>>>>>>>>>>> framework change. It does not look like any marks
>>>>>>>>>>>>>>>>>> are made when
>>>>>>>>>>>>>>>>>> the LogConfiguration changes during runtime, and
>>>>>>>>>>>>>>>>>> we would need
>>>>>>>>>>>>>>>>>> to record that in order to know what to print
>>>>>>>>>>>>>>>>>> when we dump into
>>>>>>>>>>>>>>>>>> hs_err.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Yes, this would required the framework to keep
>>>>>>>>>>>>>>>>> some sort of log
>>>>>>>>>>>>>>>>> of configuration changes. Is there value in
>>>>>>>>>>>>>>>>> knowing that the log
>>>>>>>>>>>>>>>>> configuration changed since startup?
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I think it is useful along with other information.
>>>>>>>>>>>>>>>> An example case:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Let's say we are logging a message whenever a lock
>>>>>>>>>>>>>>>> is acquired or
>>>>>>>>>>>>>>>> released. In a subsystem like this, the action
>>>>>>>>>>>>>>>> which dooms the vm
>>>>>>>>>>>>>>>> may not cause an immediate crash. This leaves time
>>>>>>>>>>>>>>>> for logging to
>>>>>>>>>>>>>>>> turn on or off in between the bad action and the
>>>>>>>>>>>>>>>> crash. If you
>>>>>>>>>>>>>>>> don't know when logging was active and when it was
>>>>>>>>>>>>>>>> not, then the
>>>>>>>>>>>>>>>> absence of a particular message does not give you much
>>>>>>>>>>>>>>>> information. You may not see the message that has
>>>>>>>>>>>>>>>> the answer for
>>>>>>>>>>>>>>>> you because it was not logged, though the action
>>>>>>>>>>>>>>>> may have occurred.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> However, if we don't have the framework support for
>>>>>>>>>>>>>>>> this then I
>>>>>>>>>>>>>>>> believe it should be added later.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> This is a good example. A small easy solution, as I
>>>>>>>>>>>>>>>> mentioned before, could be just to distinguish between
>>>>>>>>>>>>>>>> "logging parameters stable since startup" and "logging
>>>>>>>>>>>>>>>> parameters changed at some time". That way you would at
>>>>>>>>>>>>>>>> least know whether to trust the logging output.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> But you are right, this can be added later.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I've filed
>>>>>>>>>>>>>>> https://bugs.openjdk.java.net/browse/JDK-8153945 for this.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Max: Did you see my comments about the
>>>>>>>>>>>>>>> ConfigurationLock? It was an inline reply to your first
>>>>>>>>>>>>>>> mail.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>>> Marcus
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Kind Regards, Thomas
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>>>>>> Max
>>>>>>>>>>>>>>>>>>> Kind Regards, Thomas
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> On Tue, Mar 29, 2016 at 9:00 PM, Max Ockner
>>>>>>>>>>>>>>>>>>> <max.ockner at oracle.com
>>>>>>>>>>>>>>>>>>> <mailto:max.ockner at oracle.com>> wrote:
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Hello,
>>>>>>>>>>>>>>>>>>> Please review another Unified Logging
>>>>>>>>>>>>>>>>>>> change. They are
>>>>>>>>>>>>>>>>>>> almost done, and we are serious this time.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> bug:
>>>>>>>>>>>>>>>>>>> https://bugs.openjdk.java.net/browse/JDK-8151526
>>>>>>>>>>>>>>>>>>> webrev:
>>>>>>>>>>>>>>>>>>> http://cr.openjdk.java.net/~mockner/8151526.01/
>>>>>>>>>>>>>>>>>>> <http://cr.openjdk.java.net/%7Emockner/8151526.01/>
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> LogConfiguration::describe() takes the
>>>>>>>>>>>>>>>>> ConfigurationLock, which
>>>>>>>>>>>>>>>>> might be problematic for the error handler. I
>>>>>>>>>>>>>>>>> suppose the error
>>>>>>>>>>>>>>>>> handler could potentially deadlock if its thread
>>>>>>>>>>>>>>>>> already holds
>>>>>>>>>>>>>>>>> the lock. Unsure how to resolve this, because
>>>>>>>>>>>>>>>>> skipping to take
>>>>>>>>>>>>>>>>> the lock means that we might crash due to another
>>>>>>>>>>>>>>>>> thread
>>>>>>>>>>>>>>>>> changing the configuration as we read it.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>>>>> Marcus
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> The logging configuration is now printed in
>>>>>>>>>>>>>>>>>>> each hs_err
>>>>>>>>>>>>>>>>>>> file. The output is the same as you would
>>>>>>>>>>>>>>>>>>> see from
>>>>>>>>>>>>>>>>>>> -Xlog:logging=trace and it is obtained from
>>>>>>>>>>>>>>>>>>> LogConfiguration::describe().
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Below is a sample of the hs_err contents.
>>>>>>>>>>>>>>>>>>> The Logging info
>>>>>>>>>>>>>>>>>>> is printed after VM Arguments and Whitebox,
>>>>>>>>>>>>>>>>>>> and before
>>>>>>>>>>>>>>>>>>> Environment Variables.
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> VM Arguments:
>>>>>>>>>>>>>>>>>>> java_command: Kaboom
>>>>>>>>>>>>>>>>>>> java_class_path (initial): .
>>>>>>>>>>>>>>>>>>> Launcher Type: SUN_STANDARD
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Logging:
>>>>>>>>>>>>>>>>>>> Available log levels: off, trace, debug,
>>>>>>>>>>>>>>>>>>> info, warning, error
>>>>>>>>>>>>>>>>>>> Available log decorators: time (t), uptime
>>>>>>>>>>>>>>>>>>> (u), timemillis
>>>>>>>>>>>>>>>>>>> (tm), uptimemillis (um), timenanos (tn),
>>>>>>>>>>>>>>>>>>> uptimenanos (un),
>>>>>>>>>>>>>>>>>>> hostname (hn), pid (p), tid (ti), level (l),
>>>>>>>>>>>>>>>>>>> tags (tg)
>>>>>>>>>>>>>>>>>>> Available log tags: alloc, age, barrier,
>>>>>>>>>>>>>>>>>>> biasedlocking,
>>>>>>>>>>>>>>>>>>> bot, census, classhisto, classresolve,
>>>>>>>>>>>>>>>>>>> classinit,
>>>>>>>>>>>>>>>>>>> classload, classloaderdata, classunload,
>>>>>>>>>>>>>>>>>>> classpath,
>>>>>>>>>>>>>>>>>>> compaction, cpu, cset, defaultmethods, ergo,
>>>>>>>>>>>>>>>>>>> exceptions,
>>>>>>>>>>>>>>>>>>> exit, freelist, gc, heap, humongous, ihop,
>>>>>>>>>>>>>>>>>>> itables, jni,
>>>>>>>>>>>>>>>>>>> liveness, logging, marking, metaspace, modules,
>>>>>>>>>>>>>>>>>>> monitorinflation, os, phases, plab,
>>>>>>>>>>>>>>>>>>> promotion, preorder,
>>>>>>>>>>>>>>>>>>> protectiondomain, ref, refine, region,
>>>>>>>>>>>>>>>>>>> remset, safepoint,
>>>>>>>>>>>>>>>>>>> safepointcleanup, scavenge, scrub,
>>>>>>>>>>>>>>>>>>> stacktrace, start,
>>>>>>>>>>>>>>>>>>> startuptime, state, stats, stringdedup,
>>>>>>>>>>>>>>>>>>> stringtable,
>>>>>>>>>>>>>>>>>>> survivor, sweep, task, thread, tlab, time,
>>>>>>>>>>>>>>>>>>> verboseverification, verify, vmoperation,
>>>>>>>>>>>>>>>>>>> vtables
>>>>>>>>>>>>>>>>>>> Log output configuration:
>>>>>>>>>>>>>>>>>>> #0: stdout all=off uptime,level,tags,
>>>>>>>>>>>>>>>>>>> #1: stderr all=warning uptime,level,tags,
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> Environment Variables:
>>>>>>>>>>>>>>>>>>> JAVA_HOME=/scratch/mockner/UL/8151526/build/linux-x86_64-normal-server-fastdebug/images/jdk
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> PATH=/home/mockner/tools/webrev:/bin:/usr/bin:/usr/local/bin:/usr/sbin:/home/mockner/bin:/home/mockner/linux/bin
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>> SHELL=/bin/bash
>>>>>>>>>>>>>>>>>>> OS=Linux
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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