July 18, 2005

export LD_ASSUME_KERNEL=2.4.1 lockup fix

I think the possibility of a coincidence of having an internal InfinityDB liveness problem
at the exact same time as this known problem is pretty low, so I'm happy that all is well
now. I haven't heard about this LD_ASSUME_KERNEL thing. If the IO on the
underlying infinitydb file can block indefinitely, we have a perfect explanation the situation
in the Thread dump.

I had another customer who had configured a Solaris (I think) to have a 2GB file size
limit. It was also hard to find!

Glad to help,

Roger

Matt Quail wrote:

> Heya Roger,
>
> Thanks for that next release, I'll include it our next version.
>
> We have managed to solve our customers locking problem: the question is whether that one thread-dump I sent you was coincidentally highlighting an infinitydb-related deadlock problem, or it was just a manifestation of the customer's underlying problem.
>
> The underlying problem was the "LD_ASSUME_KERNEL" problem. On RedHat 9 (and some other systems?), if you are doing socket operations, the JVM goes funky after a while, and all socket operations block indefinitely. In some reports, this bug even effects *all* IO operations in the JVM. So this means the infinitydb lock could be simply related to buggy IO blocking?
>
> In any event, the workaround for this bug is to set this env var before starting the JVM:
> export LD_ASSUME_KERNEL=2.4.1
>
>> Has the lockup happened more than once? If so, please try to get me the same thread dump as before, as it was very helpful.
>
>
>
> I only have the threaddumps I sent you, but if I collect any more I'll pass them on. But (fingers crossed) the underlying problem is now fixed.
>
> =Matt
>
> Roger L Deran wrote:
>
>> Hi Matt.
>>
>> Here is a new deployment installer that may fix the problem. No guarantees, but
>> there is an improvement in the area related to the apparent lockup that could
>> solve the problem. (specifically, notify() was changed to notifyAll()). This is
>> officially a beta version but it should be solid because there was only one change.
>>
>> Has the lockup happened more than once? If so, please try to get me the same thread dump
>> as before, as it was very helpful.
>>
>> The new version's URL:
>>
>> http://boilerbay.com/infinitydb/InfinityDBUnpackerDeployment_v1.0.29_8301.exe
>>
>> Thanks
>>
>> Roger Deran
>>
>> Matt Quail wrote:
>>
>>> Hi guys,
>>>
>>> One of our customers has reported a "lock up", and was able to produce a thread-dump, which is attached.
>>>
>>> We are running v1.0.25_8430.
>>>
>>> We have not upgraded to v1.0.27-1964, is that likely to fix it?
>>> I tried this url but the file seems to have gone http://www.boilerbay.com/infinitydb/InfinityDBDeploymentInstaller_v1.0.27-1964.exe
>>>
>>> Some more info follows. What do you think? Is the problem likely to be a locking problem in infinitydb, or am I seeing a side effect of something else in our program?
>>>
>>> There are a whole load of threads calling InfinityDB.next(), which is "waiting to lock <0x2f680a18>". Our code that is calling next() here looks like this:
>>>
>>>  String key = ...;
>>>  long defaultValue = ...;
>>>  Cu cu = Cu.alloc();
>>>  try {
>>>      cu.append(EAV.PROP_STORE).append(key);
>>>      int p1 = cu.length();
>>>      if (mDB.next(cu, p1)) {
>>>          final long v = cu.longAt(p1);
>>>          return v;
>>>      } else {
>>>          return defaultValue;
>>>      }
>>>  } catch (IOException e) {
>>>      throw new DbException(e);
>>>  } finally {
>>>      Cu.dispose(cu);
>>>  }
>>>
>>> The "b0-4" thread has the 0x2f680a18 lock, and it is waiting on another object. The code in b0-4 is doing an read, and looks like this:
>>>
>>>
>>>   Attribute attr = ...;
>>>   String defaultValue = ...;
>>>   try {
>>>       cu.append(attr);
>>>       int valueOffset = cu.length();
>>>       return db.next(cu,valueOffset) ?  cu.stringAt(valueOffset) : defaultValue;
>>>   } finally {
>>>       cu.setLength(pkLen);
>>>   }
>>>
>>>
>>> Thanks for your time :D
>>>
>>> =Matt
>>>
>>
>>
>>
>

Posted 5 years, 7 months ago on July 18, 2005
The trackback url for this post is http://boilerbay.com/infinitydb/forum/bblog/trackback.php/11/
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