Thanks I will have another look. One thing you could try is to use “-Dio.netty.threadLocalDirectBufferSize=16” and see if the leaks are gone then.
This is not a solution but would help me a bit :) > On 20 Jul 2016, at 19:39, Chris Conroy <[email protected]> wrote: > > It's no problem! I'm sorry for all the back and forth. I'd just send you the > heap dump if I could, but alas it will be difficult to impossible to sanitize > it from sensitive data. (As an aside, I really wish there were tools that let > you interact with java heap dumps more programmatically...) > > In the particular heap dump I'm looking at, I have 12,762 such buffers. > Interestingly, I see 123k Recycler$DefaultHandles in the heap... > <Screen Shot 2016-07-20 at 1.31.40 PM.png> > > > Here's the only path to GC roots from the leaked byte bufs: > > <Screen Shot 2016-07-20 at 1.34.50 PM.png> > > The threads appear to all be server worker threads. The Biggest Objects - > Dominators view for strong references in YourKit shows me that the server > worker threads are the dominant roots in the heap: > > <Screen Shot 2016-07-20 at 1.38.19 PM.png> > > > > > > On Wed, Jul 20, 2016 at 1:22 PM, 'Norman Maurer' via Netty discussions > <[email protected] <mailto:[email protected]>> wrote: > And how many of these you have ? > > Sorry for all the questions :( > >> On 20 Jul 2016, at 19:19, Chris Conroy <[email protected] >> <mailto:[email protected]>> wrote: >> >> Here's an example leaked buf >> >> <Screen Shot 2016-07-20 at 1.18.24 PM.png> >> >> On Wed, Jul 20, 2016 at 1:17 PM, 'Norman Maurer' via Netty discussions >> <[email protected] <mailto:[email protected]>> wrote: >> One last thing… >> >> Can you tell me what the capacity() of the “leaked” buffer is ? >> >>> On 20 Jul 2016, at 19:11, Norman Maurer <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Thanks Chris, >>> >>> this sounds really “fishy”. Let me try to debug this a bit more (not sure >>> yet how tho). >>> >>>> On 20 Jul 2016, at 19:06, Chris Conroy <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> This leak resulted in exhaustion of 4G of NIO memory. The same application >>>> under Netty 3 only ever uses <200MB of NIO memory. I have run several >>>> experiments where I take some traffic, disable the node from serving >>>> traffic, and then force a full GC. The allocated NIO memory does not >>>> return to normal levels. >>>> >>>> Spot checking the byte buf handles from my heap dump, I see lots (all?) >>>> `recycle` and `lastRecycleIds` of `int -2147483648 <tel:2147483648> = >>>> 0x80000000` >>>> >>>> The experiment yesterday with the recycler disabled did not result in any >>>> such leaks over several hours of traffic. >>>> >>>> On Wed, Jul 20, 2016 at 12:41 AM, 'Norman Maurer' via Netty discussions >>>> <[email protected] <mailto:[email protected]>> wrote: >>>> Are you actually sure these are really leaked ? >>>> >>>> The point of the “ThreadLocalUnsafeDirectByteBuf” is that it can be reused >>>> so it is expected that it not gets released after its written but put back >>>> in the recycler. Or you saying there are too many of these ? >>>> >>>> >>>>> On 19 Jul 2016, at 22:39, Chris Conroy <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> Yes all the leaked buffers look to be ThreadLocalUnsafeDirectByteBuf >>>>> >>>>> Disabling the recycler w/o backpressure on slow readers resulted in >>>>> several massive allocation events. I was able to free them by forcing GC >>>>> so no leaks there. Memory usage with backpressure on slow readers is back >>>>> down to Netty 3 w/o backpressure levels. I don't see any leaks so far. >>>>> >>>>> Assuming that disabling the recycler does indeed prevent leaks, where do >>>>> we go from there? Any ideas of things to look for in my application that >>>>> might cause the recycler to get into a bad state? >>>>> >>>>> On Tue, Jul 19, 2016 at 3:40 PM, 'Norman Maurer' via Netty discussions >>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>> Btw all the “leaking” buffers are always: >>>>> >>>>> ThreadLocalUnsafeDirectByteBuf >>>>> >>>>> ? >>>>> >>>>> >>>>>> On 19 Jul 2016, at 21:29, Chris Conroy <[email protected] >>>>>> <mailto:[email protected]>> wrote: >>>>>> >>>>>> I ran with paranoid while observing the leak and got no messages from >>>>>> the ResourceLeakDetector. >>>>>> >>>>>> Initial results from recycler maxCapacity of 0 are looking positive with >>>>>> respect to the leak. However, I did see a large spike of NIO memory >>>>>> allocated (1G) where the Netty 3 version of this app receiving similar >>>>>> traffic peaks at about 1/10th that. I'll let this run for a while and >>>>>> report back later with the full results. >>>>>> >>>>>> On Tue, Jul 19, 2016 at 2:59 PM, 'Norman Maurer' via Netty discussions >>>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>>> Can you do me a favour and run with: >>>>>> >>>>>> -Dio.netty.recycler.maxCapacity=0 >>>>>> >>>>>> And let me know if you still see some leaks ? >>>>>> >>>>>> >>>>>> >>>>>>> On 19 Jul 2016, at 20:50, Chris Conroy <[email protected] >>>>>>> <mailto:[email protected]>> wrote: >>>>>>> >>>>>>> 4.1.0.Final >>>>>>> >>>>>>> On Tue, Jul 19, 2016 at 2:48 PM, 'Norman Maurer' via Netty discussions >>>>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>>>> Are you using 4.0 or 4.1 ? >>>>>>> >>>>>>>> On 19 Jul 2016, at 20:42, Chris Conroy <[email protected] >>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>> >>>>>>>> I have not been able to reproduce locally yet, but I do see it in a >>>>>>>> cluster that takes a lot of varied traffic. The leak detector has not >>>>>>>> fired for this under advanced. I will give paranoid a shot to be safe, >>>>>>>> but it's my understanding that the leak detection framework is more >>>>>>>> for dealing with pooled byte buf misuse, but in this case I am >>>>>>>> exclusively using unpooled heap byte bufs: these are just the socket >>>>>>>> direct byte bufs that appear to be leaking. >>>>>>>> >>>>>>>> I meant to add this earlier: The path to GC root goes: >>>>>>>> >>>>>>>> io.netty.buffer.ByteBufUtil$ThreadLocalUnsafeDirectByteBuf >>>>>>>> io.netty.util.Recycler$DefaultHandle >>>>>>>> io.netty.util.Recycler$DefaultHandle[] >>>>>>>> io.netty.util.Recycler#Stack >>>>>>>> java.lang.Object[] >>>>>>>> io.netty.util.internal.InternalThreadLocalMap >>>>>>>> ... (more thread local map refs up to java.lang.Thread) >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Tuesday, July 19, 2016 at 2:17:25 PM UTC-4, Norman Maurer wrote: >>>>>>>> Can you provide a reproducer? Also did you try to run with paranoid >>>>>>>> leak detection >>>>>>>> >>>>>>>> Am 19.07.2016 um 20:04 schrieb Chris Conroy <[email protected] <>>: >>>>>>>> >>>>>>>>> Ah okay: I didn't see the calls to failFlushed since they occur above >>>>>>>>> the stanza I found suspicious. >>>>>>>>> >>>>>>>>> So, the above explanation is probably not correct. Still, I am seeing >>>>>>>>> a leak where DirectByteBufs are rooted to the recycler, and the speed >>>>>>>>> at which these buffers leak appears to be correlated with >>>>>>>>> slow/partial readers. >>>>>>>>> >>>>>>>>> On Monday, July 18, 2016 at 4:36:31 PM UTC-4, Norman Maurer wrote: >>>>>>>>> failFlushed(...) should be called to fail and release all flushed >>>>>>>>> messages. >>>>>>>>> >>>>>>>>> Are you saying this not happens? >>>>>>>>> >>>>>>>>> Am 18.07.2016 um 22:02 schrieb Chris Conroy <[email protected] <>>: >>>>>>>>> >>>>>>>>>> I’ve been trying to track down a NIO memory leak that occurs in a >>>>>>>>>> Netty application I am porting from Netty 3 to Netty 4. This leak >>>>>>>>>> does not occur in the Netty 3 version of the application. >>>>>>>>>> >>>>>>>>>> For now, I’m using only unpooled heap buffers in Netty 4, but NIO >>>>>>>>>> buffers do come into play for socket communication. >>>>>>>>>> >>>>>>>>>> I’ve captured a few heap dumps from affected instances, and in each >>>>>>>>>> it appears that the leaked DirectByteBuf java objects are rooted in >>>>>>>>>> an io.netty.util.Recycler. >>>>>>>>>> >>>>>>>>>> These buffers remain indefinitely: I can disable the application to >>>>>>>>>> drain traffic and force GCs, but the # of NIO buffers and NIO >>>>>>>>>> allocated space stays flat. >>>>>>>>>> >>>>>>>>>> The issue is likely related to slow readers. However, the leak >>>>>>>>>> persists long after all channels have been closed. >>>>>>>>>> >>>>>>>>>> I implemented a writability listener and the leak does appear to go >>>>>>>>>> away if I stop writing to a channel after it goes unwritable. This >>>>>>>>>> is good, but I’m still worried that this just makes the problem less >>>>>>>>>> likely since it’s still possible to write/flush and have pending >>>>>>>>>> data: writability just limits how much data will be buffered. >>>>>>>>>> >>>>>>>>>> Digging into ChannelOutBoundBuffer I see the following stanza in >>>>>>>>>> close: >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> // Release all unflushed messages. >>>>>>>>>> try { >>>>>>>>>> Entry e = unflushedEntry; >>>>>>>>>> while (e != null) { >>>>>>>>>> // Just decrease; do not trigger any events via >>>>>>>>>> decrementPendingOutboundBytes() >>>>>>>>>> int size = e.pendingSize; >>>>>>>>>> TOTAL_PENDING_SIZE_UPDATER.addAndGet(this, -size); >>>>>>>>>> >>>>>>>>>> if (!e.cancelled) { >>>>>>>>>> ReferenceCountUtil.safeRelease(e.msg); >>>>>>>>>> safeFail(e.promise, cause); >>>>>>>>>> } >>>>>>>>>> e = e.recycleAndGetNext(); >>>>>>>>>> } >>>>>>>>>> } finally { >>>>>>>>>> inFail = false; >>>>>>>>>> } >>>>>>>>>> clearNioBuffers(); >>>>>>>>>> This seems a bit curious to me: why are flushed buffers not released >>>>>>>>>> here? Since the leak seems to be rooted in the Recycler, this could >>>>>>>>>> be the culprit…What do you think? >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>>> Groups "Netty discussions" group. >>>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>>> send an email to [email protected] <>. >>>>>>>>>> To view this discussion on the web visit >>>>>>>>>> https://groups.google.com/d/msgid/netty/CA%2B%3DgZKADssKFcs-WCc8%2Br2RWrvbgg3csaJPdcsXL_mCD5yG2bg%40mail.gmail.com >>>>>>>>>> >>>>>>>>>> <https://groups.google.com/d/msgid/netty/CA%2B%3DgZKADssKFcs-WCc8%2Br2RWrvbgg3csaJPdcsXL_mCD5yG2bg%40mail.gmail.com?utm_medium=email&utm_source=footer>. >>>>>>>>>> For more options, visit https://groups.google.com/d/optout >>>>>>>>>> <https://groups.google.com/d/optout>. >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>> Groups "Netty 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