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Epoll: Fix excessive CPU usage when Channel is only registered but no…#16250

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normanmaurer merged 4 commits into4.2from
epoll_cpu
Feb 12, 2026
Merged

Epoll: Fix excessive CPU usage when Channel is only registered but no…#16250
normanmaurer merged 4 commits into4.2from
epoll_cpu

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@normanmaurer normanmaurer commented Feb 10, 2026

…t bound / connected

Motivation:

We should only add a fd (Channel) to epoll onec it is considered active (connected) as otherwise we will receive EPOLLHUP events until it is active. This can lead to excessive CPU usage.

Modifications:

Delay adding of fd to epoll until it is considered active / connected.

Result:

Fixes #16240

@normanmaurer
Epoll: Fix excessive CPU usage when Channel is only registered but no…
168eb58 
…t bound / connected

Motivation:

We should only add a fd (Channel) to epoll onec it is considered active (connected) as otherwise we will receive EPOLLHUP events until it is active. This can lead to excessive CPU usage.

Modifications:

Delay adding of fd to epoll until it is considered active / connected.

Result:

Fixes #16240
@normanmaurer normanmaurer mentioned this pull request Feb 10, 2026
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normanmaurer commented Feb 10, 2026

Also @isaacrivriv

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normanmaurer commented Feb 10, 2026

I need to check but I suspect we have the same issue in 4.1 and of course it also exists in the 5.0 branch.

@normanmaurer normanmaurer added this to the 4.2.11.Final milestone Feb 10, 2026
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isaacrivriv commented Feb 10, 2026

Thanks for getting a fix @normanmaurer! At first glance, this looks like it covers the issue since the fix I tried locally worked around the same areas with similar logic. I'll build this and try it with our use case locally to confirm.

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isaacrivriv commented Feb 10, 2026

I just finished building and testing locally and I'm not seeing the same behavior or high CPU usage so this should have fixed the issue!

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normanmaurer commented Feb 11, 2026

Added a unit test as well for epoll.

@normanmaurer normanmaurer merged commit 60bd05f into 4.2 Feb 12, 2026
32 of 36 checks passed
@normanmaurer normanmaurer deleted the epoll_cpu branch February 12, 2026 10:04
@normanmaurer normanmaurer restored the epoll_cpu branch February 12, 2026 10:31
@normanmaurer normanmaurer deleted the epoll_cpu branch February 12, 2026 10:37
normanmaurer added a commit that referenced this pull request Feb 12, 2026
@normanmaurer
Epoll: Fix excessive CPU usage when Channel is only registered but no… (
fce9414 
#16250)

…t bound / connected

Motivation:

We should only add a fd (Channel) to epoll onec it is considered active
(connected) as otherwise we will receive EPOLLHUP events until it is
active. This can lead to excessive CPU usage.

Modifications:

Delay adding of fd to epoll until it is considered active / connected.

Result:

Fixes #16240
@normanmaurer normanmaurer mentioned this pull request Feb 12, 2026
Merged
normanmaurer added a commit that referenced this pull request Feb 12, 2026
@normanmaurer
Epoll: Fix excessive CPU usage when Channel is only registered but no… (
46bbed1 
#16260)

…… (#16250)

…t bound / connected

Motivation:

We should only add a fd (Channel) to epoll onec it is considered active
(connected) as otherwise we will receive EPOLLHUP events until it is
active. This can lead to excessive CPU usage.

Modifications:

Delay adding of fd to epoll until it is considered active / connected.

Result:

Fixes #16240
mergify bot added a commit to ArcadeData/arcadedb that referenced this pull request Mar 29, 2026
@mergify
chore(deps): bump io.netty:netty-all from 4.2.10.Final to 4.2.12.Fina…
e42aa05 
…l [skip ci]

Bumps [io.netty:netty-all](https://github.com/netty/netty) from 4.2.10.Final to 4.2.12.Final.
Release notes

*Sourced from [io.netty:netty-all's releases](https://github.com/netty/netty/releases).*

> netty-4.2.12.Final
> ------------------
>
> What's Changed
> --------------
>
> * Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16550](https://redirect.github.com/netty/netty/pull/16550)
>
> **Full Changelog**: <netty/netty@netty-4.2.11.Final...netty-4.2.12.Final>
>
> netty-4.2.11.Final
> ------------------
>
> Security
> --------
>
> * CVE-2026-33871, [HTTP/2 CONTINUATION Frame Flood Denial of Service](GHSA-w9fj-cfpg-grvv)
> * CVE-2026-33870, [HTTP Request Smuggling via Chunked Extension Quoted-String Parsing](GHSA-pwqr-wmgm-9rr8)
>
> What's Changed
> --------------
>
> * Update to latest JDK 26 EA release by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16230](https://redirect.github.com/netty/netty/pull/16230)
> * HTTP3: Allow to support non-standard HTTP3 settings by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16171](https://redirect.github.com/netty/netty/pull/16171)
> * Fix Incorrect nanos-to-millis conversion in epoll\_wait EINTR retry loop by [`@​adwsingh`](https://github.com/adwsingh) in [netty/netty#16245](https://redirect.github.com/netty/netty/pull/16245)
> * Allocate one large segment and slice for each MsgHdrMemory by [`@​dreamlike-ocean`](https://github.com/dreamlike-ocean) in [netty/netty#16234](https://redirect.github.com/netty/netty/pull/16234)
> * Make RefCntOpenSslContext.deallocate more robust by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16253](https://redirect.github.com/netty/netty/pull/16253)
> * Epoll: Fix excessive CPU usage when Channel is only registered but no… by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16250](https://redirect.github.com/netty/netty/pull/16250)
> * Update to gcc for arm 10.3-2021.07 by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16255](https://redirect.github.com/netty/netty/pull/16255)
> * Add acmeIdentifier extension support to pkitesting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16256](https://redirect.github.com/netty/netty/pull/16256)
> * Update JDK versions to latest patch releases by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16254](https://redirect.github.com/netty/netty/pull/16254)
> * Avoid allocation in HttpObjectEncoder.addEncodedLengthHex method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16241](https://redirect.github.com/netty/netty/pull/16241)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16269](https://redirect.github.com/netty/netty/pull/16269)
> * Revert "Automatic backporting workflow from 4.1 to 4.2" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16270](https://redirect.github.com/netty/netty/pull/16270)
> * HTTP2: Correctly account for padding when decompress by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16264](https://redirect.github.com/netty/netty/pull/16264)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16271](https://redirect.github.com/netty/netty/pull/16271)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16273](https://redirect.github.com/netty/netty/pull/16273)
> * Backport PRs must be created with personal access tokens by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16276](https://redirect.github.com/netty/netty/pull/16276)
> * Expose QuicSslContextBuilder::sni by [`@​ZeroErrors`](https://github.com/ZeroErrors) in [netty/netty#16178](https://redirect.github.com/netty/netty/pull/16178)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16275](https://redirect.github.com/netty/netty/pull/16275)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16283](https://redirect.github.com/netty/netty/pull/16283)
> * Remove the unpooled allocator from test permutations by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16282](https://redirect.github.com/netty/netty/pull/16282)
> * Some polishing of the porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16288](https://redirect.github.com/netty/netty/pull/16288)
> * Allow to set destination connection id when creating a client side QuicheChannel by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16286](https://redirect.github.com/netty/netty/pull/16286)
> * Update to latest JDK26 EA build by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16295](https://redirect.github.com/netty/netty/pull/16295)
> * Add javadoc to clarify responsibility of the user when generating the remote connection id by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16293](https://redirect.github.com/netty/netty/pull/16293)
> * Make the build run faster by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16290](https://redirect.github.com/netty/netty/pull/16290)
> * Fix IDE warnings in SslHandler by [`@​doom369`](https://github.com/doom369) in [netty/netty#16237](https://redirect.github.com/netty/netty/pull/16237)
> * Decrease Long allocations and map.put calls in ReferenceCountedOpenSllEngine in handshake() method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16242](https://redirect.github.com/netty/netty/pull/16242)
> * Support boringssl SSLCredential API by [`@​jmcrawford45`](https://github.com/jmcrawford45) in [netty/netty#15919](https://redirect.github.com/netty/netty/pull/15919)
> * Fix high-order bit aliasing in HttpUtil.validateToken by [`@​furkanvarol`](https://github.com/furkanvarol) in [netty/netty#16279](https://redirect.github.com/netty/netty/pull/16279)
> * Improve multi-byte access performance when UNALIGNED availability is unknown by [`@​Songdoeon`](https://github.com/Songdoeon) in [netty/netty#16207](https://redirect.github.com/netty/netty/pull/16207)
> * Avoid unnecessary SSL.getVersion() call and string allocation in ReferenceCountedOpenSslEngine by [`@​doom369`](https://github.com/doom369) in [netty/netty#16278](https://redirect.github.com/netty/netty/pull/16278)
> * Support more branch freedom for auto-porting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16300](https://redirect.github.com/netty/netty/pull/16300)
> * fix: the precedence of + is higher than >> by [`@​cuiweixie`](https://github.com/cuiweixie) in [netty/netty#16312](https://redirect.github.com/netty/netty/pull/16312)
> * AdaptiveByteBufAllocator: make sure byteBuf.capacity() not greater than byteBuf.maxCapacity() by [`@​laosijikaichele`](https://github.com/laosijikaichele) in [netty/netty#16309](https://redirect.github.com/netty/netty/pull/16309)
> * Fix flaky PooledByteBufAllocatorTest by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16313](https://redirect.github.com/netty/netty/pull/16313)
> * Fix pooled arena accounting tests by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16321](https://redirect.github.com/netty/netty/pull/16321)

... (truncated)


Commits

* [`67ce541`](netty/netty@67ce541) [maven-release-plugin] prepare release netty-4.2.12.Final
* [`7074624`](netty/netty@7074624) Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`c3b0a43`](netty/netty@c3b0a43) [maven-release-plugin] prepare for next development iteration
* [`c94a818`](netty/netty@c94a818) [maven-release-plugin] prepare release netty-4.2.11.Final
* [`3b76df1`](netty/netty@3b76df1) Merge commit from fork
* [`aae944a`](netty/netty@aae944a) Auto-port 4.2: Limit the number of Continuation frames per HTTP2 Headers ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`6001499`](netty/netty@6001499) Eliminate redundant bounds checks in CompositeByteBuf accessors ([#16525](https://redirect.github.com/netty/netty/issues/16525))
* [`a7fbb6f`](netty/netty@a7fbb6f) JdkZlibDecoder: accumulate decompressed output before firing channelRead ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`7937553`](netty/netty@7937553) Enforce io.netty.maxDirectMemory accounting on all Java versions ([#16489](https://redirect.github.com/netty/netty/issues/16489))
* [`893ea2e`](netty/netty@893ea2e) Allocate less in QueryStringDecoder.addParam for typical use case ([#16527](https://redirect.github.com/netty/netty/issues/16527))
* Additional commits viewable in [compare view](netty/netty@netty-4.2.10.Final...netty-4.2.12.Final)
  
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mergify bot added a commit to ArcadeData/arcadedb that referenced this pull request Mar 29, 2026
@mergify
chore(deps): bump netty.version from 4.2.10.Final to 4.2.12.Final [sk…
a88075d 
…ip ci]

Bumps `netty.version` from 4.2.10.Final to 4.2.12.Final.
Updates `io.netty:netty-transport` from 4.2.10.Final to 4.2.12.Final
Release notes

*Sourced from [io.netty:netty-transport's releases](https://github.com/netty/netty/releases).*

> netty-4.2.12.Final
> ------------------
>
> What's Changed
> --------------
>
> * Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16550](https://redirect.github.com/netty/netty/pull/16550)
>
> **Full Changelog**: <netty/netty@netty-4.2.11.Final...netty-4.2.12.Final>
>
> netty-4.2.11.Final
> ------------------
>
> Security
> --------
>
> * CVE-2026-33871, [HTTP/2 CONTINUATION Frame Flood Denial of Service](GHSA-w9fj-cfpg-grvv)
> * CVE-2026-33870, [HTTP Request Smuggling via Chunked Extension Quoted-String Parsing](GHSA-pwqr-wmgm-9rr8)
>
> What's Changed
> --------------
>
> * Update to latest JDK 26 EA release by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16230](https://redirect.github.com/netty/netty/pull/16230)
> * HTTP3: Allow to support non-standard HTTP3 settings by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16171](https://redirect.github.com/netty/netty/pull/16171)
> * Fix Incorrect nanos-to-millis conversion in epoll\_wait EINTR retry loop by [`@​adwsingh`](https://github.com/adwsingh) in [netty/netty#16245](https://redirect.github.com/netty/netty/pull/16245)
> * Allocate one large segment and slice for each MsgHdrMemory by [`@​dreamlike-ocean`](https://github.com/dreamlike-ocean) in [netty/netty#16234](https://redirect.github.com/netty/netty/pull/16234)
> * Make RefCntOpenSslContext.deallocate more robust by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16253](https://redirect.github.com/netty/netty/pull/16253)
> * Epoll: Fix excessive CPU usage when Channel is only registered but no… by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16250](https://redirect.github.com/netty/netty/pull/16250)
> * Update to gcc for arm 10.3-2021.07 by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16255](https://redirect.github.com/netty/netty/pull/16255)
> * Add acmeIdentifier extension support to pkitesting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16256](https://redirect.github.com/netty/netty/pull/16256)
> * Update JDK versions to latest patch releases by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16254](https://redirect.github.com/netty/netty/pull/16254)
> * Avoid allocation in HttpObjectEncoder.addEncodedLengthHex method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16241](https://redirect.github.com/netty/netty/pull/16241)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16269](https://redirect.github.com/netty/netty/pull/16269)
> * Revert "Automatic backporting workflow from 4.1 to 4.2" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16270](https://redirect.github.com/netty/netty/pull/16270)
> * HTTP2: Correctly account for padding when decompress by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16264](https://redirect.github.com/netty/netty/pull/16264)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16271](https://redirect.github.com/netty/netty/pull/16271)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16273](https://redirect.github.com/netty/netty/pull/16273)
> * Backport PRs must be created with personal access tokens by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16276](https://redirect.github.com/netty/netty/pull/16276)
> * Expose QuicSslContextBuilder::sni by [`@​ZeroErrors`](https://github.com/ZeroErrors) in [netty/netty#16178](https://redirect.github.com/netty/netty/pull/16178)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16275](https://redirect.github.com/netty/netty/pull/16275)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16283](https://redirect.github.com/netty/netty/pull/16283)
> * Remove the unpooled allocator from test permutations by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16282](https://redirect.github.com/netty/netty/pull/16282)
> * Some polishing of the porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16288](https://redirect.github.com/netty/netty/pull/16288)
> * Allow to set destination connection id when creating a client side QuicheChannel by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16286](https://redirect.github.com/netty/netty/pull/16286)
> * Update to latest JDK26 EA build by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16295](https://redirect.github.com/netty/netty/pull/16295)
> * Add javadoc to clarify responsibility of the user when generating the remote connection id by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16293](https://redirect.github.com/netty/netty/pull/16293)
> * Make the build run faster by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16290](https://redirect.github.com/netty/netty/pull/16290)
> * Fix IDE warnings in SslHandler by [`@​doom369`](https://github.com/doom369) in [netty/netty#16237](https://redirect.github.com/netty/netty/pull/16237)
> * Decrease Long allocations and map.put calls in ReferenceCountedOpenSllEngine in handshake() method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16242](https://redirect.github.com/netty/netty/pull/16242)
> * Support boringssl SSLCredential API by [`@​jmcrawford45`](https://github.com/jmcrawford45) in [netty/netty#15919](https://redirect.github.com/netty/netty/pull/15919)
> * Fix high-order bit aliasing in HttpUtil.validateToken by [`@​furkanvarol`](https://github.com/furkanvarol) in [netty/netty#16279](https://redirect.github.com/netty/netty/pull/16279)
> * Improve multi-byte access performance when UNALIGNED availability is unknown by [`@​Songdoeon`](https://github.com/Songdoeon) in [netty/netty#16207](https://redirect.github.com/netty/netty/pull/16207)
> * Avoid unnecessary SSL.getVersion() call and string allocation in ReferenceCountedOpenSslEngine by [`@​doom369`](https://github.com/doom369) in [netty/netty#16278](https://redirect.github.com/netty/netty/pull/16278)
> * Support more branch freedom for auto-porting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16300](https://redirect.github.com/netty/netty/pull/16300)
> * fix: the precedence of + is higher than >> by [`@​cuiweixie`](https://github.com/cuiweixie) in [netty/netty#16312](https://redirect.github.com/netty/netty/pull/16312)
> * AdaptiveByteBufAllocator: make sure byteBuf.capacity() not greater than byteBuf.maxCapacity() by [`@​laosijikaichele`](https://github.com/laosijikaichele) in [netty/netty#16309](https://redirect.github.com/netty/netty/pull/16309)
> * Fix flaky PooledByteBufAllocatorTest by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16313](https://redirect.github.com/netty/netty/pull/16313)
> * Fix pooled arena accounting tests by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16321](https://redirect.github.com/netty/netty/pull/16321)

... (truncated)


Commits

* [`67ce541`](netty/netty@67ce541) [maven-release-plugin] prepare release netty-4.2.12.Final
* [`7074624`](netty/netty@7074624) Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`c3b0a43`](netty/netty@c3b0a43) [maven-release-plugin] prepare for next development iteration
* [`c94a818`](netty/netty@c94a818) [maven-release-plugin] prepare release netty-4.2.11.Final
* [`3b76df1`](netty/netty@3b76df1) Merge commit from fork
* [`aae944a`](netty/netty@aae944a) Auto-port 4.2: Limit the number of Continuation frames per HTTP2 Headers ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`6001499`](netty/netty@6001499) Eliminate redundant bounds checks in CompositeByteBuf accessors ([#16525](https://redirect.github.com/netty/netty/issues/16525))
* [`a7fbb6f`](netty/netty@a7fbb6f) JdkZlibDecoder: accumulate decompressed output before firing channelRead ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`7937553`](netty/netty@7937553) Enforce io.netty.maxDirectMemory accounting on all Java versions ([#16489](https://redirect.github.com/netty/netty/issues/16489))
* [`893ea2e`](netty/netty@893ea2e) Allocate less in QueryStringDecoder.addParam for typical use case ([#16527](https://redirect.github.com/netty/netty/issues/16527))
* Additional commits viewable in [compare view](netty/netty@netty-4.2.10.Final...netty-4.2.12.Final)
  
Updates `io.netty:netty-codec` from 4.2.10.Final to 4.2.12.Final
Release notes

*Sourced from [io.netty:netty-codec's releases](https://github.com/netty/netty/releases).*

> netty-4.2.12.Final
> ------------------
>
> What's Changed
> --------------
>
> * Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16550](https://redirect.github.com/netty/netty/pull/16550)
>
> **Full Changelog**: <netty/netty@netty-4.2.11.Final...netty-4.2.12.Final>
>
> netty-4.2.11.Final
> ------------------
>
> Security
> --------
>
> * CVE-2026-33871, [HTTP/2 CONTINUATION Frame Flood Denial of Service](GHSA-w9fj-cfpg-grvv)
> * CVE-2026-33870, [HTTP Request Smuggling via Chunked Extension Quoted-String Parsing](GHSA-pwqr-wmgm-9rr8)
>
> What's Changed
> --------------
>
> * Update to latest JDK 26 EA release by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16230](https://redirect.github.com/netty/netty/pull/16230)
> * HTTP3: Allow to support non-standard HTTP3 settings by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16171](https://redirect.github.com/netty/netty/pull/16171)
> * Fix Incorrect nanos-to-millis conversion in epoll\_wait EINTR retry loop by [`@​adwsingh`](https://github.com/adwsingh) in [netty/netty#16245](https://redirect.github.com/netty/netty/pull/16245)
> * Allocate one large segment and slice for each MsgHdrMemory by [`@​dreamlike-ocean`](https://github.com/dreamlike-ocean) in [netty/netty#16234](https://redirect.github.com/netty/netty/pull/16234)
> * Make RefCntOpenSslContext.deallocate more robust by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16253](https://redirect.github.com/netty/netty/pull/16253)
> * Epoll: Fix excessive CPU usage when Channel is only registered but no… by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16250](https://redirect.github.com/netty/netty/pull/16250)
> * Update to gcc for arm 10.3-2021.07 by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16255](https://redirect.github.com/netty/netty/pull/16255)
> * Add acmeIdentifier extension support to pkitesting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16256](https://redirect.github.com/netty/netty/pull/16256)
> * Update JDK versions to latest patch releases by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16254](https://redirect.github.com/netty/netty/pull/16254)
> * Avoid allocation in HttpObjectEncoder.addEncodedLengthHex method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16241](https://redirect.github.com/netty/netty/pull/16241)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16269](https://redirect.github.com/netty/netty/pull/16269)
> * Revert "Automatic backporting workflow from 4.1 to 4.2" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16270](https://redirect.github.com/netty/netty/pull/16270)
> * HTTP2: Correctly account for padding when decompress by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16264](https://redirect.github.com/netty/netty/pull/16264)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16271](https://redirect.github.com/netty/netty/pull/16271)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16273](https://redirect.github.com/netty/netty/pull/16273)
> * Backport PRs must be created with personal access tokens by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16276](https://redirect.github.com/netty/netty/pull/16276)
> * Expose QuicSslContextBuilder::sni by [`@​ZeroErrors`](https://github.com/ZeroErrors) in [netty/netty#16178](https://redirect.github.com/netty/netty/pull/16178)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16275](https://redirect.github.com/netty/netty/pull/16275)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16283](https://redirect.github.com/netty/netty/pull/16283)
> * Remove the unpooled allocator from test permutations by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16282](https://redirect.github.com/netty/netty/pull/16282)
> * Some polishing of the porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16288](https://redirect.github.com/netty/netty/pull/16288)
> * Allow to set destination connection id when creating a client side QuicheChannel by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16286](https://redirect.github.com/netty/netty/pull/16286)
> * Update to latest JDK26 EA build by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16295](https://redirect.github.com/netty/netty/pull/16295)
> * Add javadoc to clarify responsibility of the user when generating the remote connection id by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16293](https://redirect.github.com/netty/netty/pull/16293)
> * Make the build run faster by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16290](https://redirect.github.com/netty/netty/pull/16290)
> * Fix IDE warnings in SslHandler by [`@​doom369`](https://github.com/doom369) in [netty/netty#16237](https://redirect.github.com/netty/netty/pull/16237)
> * Decrease Long allocations and map.put calls in ReferenceCountedOpenSllEngine in handshake() method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16242](https://redirect.github.com/netty/netty/pull/16242)
> * Support boringssl SSLCredential API by [`@​jmcrawford45`](https://github.com/jmcrawford45) in [netty/netty#15919](https://redirect.github.com/netty/netty/pull/15919)
> * Fix high-order bit aliasing in HttpUtil.validateToken by [`@​furkanvarol`](https://github.com/furkanvarol) in [netty/netty#16279](https://redirect.github.com/netty/netty/pull/16279)
> * Improve multi-byte access performance when UNALIGNED availability is unknown by [`@​Songdoeon`](https://github.com/Songdoeon) in [netty/netty#16207](https://redirect.github.com/netty/netty/pull/16207)
> * Avoid unnecessary SSL.getVersion() call and string allocation in ReferenceCountedOpenSslEngine by [`@​doom369`](https://github.com/doom369) in [netty/netty#16278](https://redirect.github.com/netty/netty/pull/16278)
> * Support more branch freedom for auto-porting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16300](https://redirect.github.com/netty/netty/pull/16300)
> * fix: the precedence of + is higher than >> by [`@​cuiweixie`](https://github.com/cuiweixie) in [netty/netty#16312](https://redirect.github.com/netty/netty/pull/16312)
> * AdaptiveByteBufAllocator: make sure byteBuf.capacity() not greater than byteBuf.maxCapacity() by [`@​laosijikaichele`](https://github.com/laosijikaichele) in [netty/netty#16309](https://redirect.github.com/netty/netty/pull/16309)
> * Fix flaky PooledByteBufAllocatorTest by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16313](https://redirect.github.com/netty/netty/pull/16313)
> * Fix pooled arena accounting tests by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16321](https://redirect.github.com/netty/netty/pull/16321)

... (truncated)


Commits

* [`67ce541`](netty/netty@67ce541) [maven-release-plugin] prepare release netty-4.2.12.Final
* [`7074624`](netty/netty@7074624) Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`c3b0a43`](netty/netty@c3b0a43) [maven-release-plugin] prepare for next development iteration
* [`c94a818`](netty/netty@c94a818) [maven-release-plugin] prepare release netty-4.2.11.Final
* [`3b76df1`](netty/netty@3b76df1) Merge commit from fork
* [`aae944a`](netty/netty@aae944a) Auto-port 4.2: Limit the number of Continuation frames per HTTP2 Headers ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`6001499`](netty/netty@6001499) Eliminate redundant bounds checks in CompositeByteBuf accessors ([#16525](https://redirect.github.com/netty/netty/issues/16525))
* [`a7fbb6f`](netty/netty@a7fbb6f) JdkZlibDecoder: accumulate decompressed output before firing channelRead ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`7937553`](netty/netty@7937553) Enforce io.netty.maxDirectMemory accounting on all Java versions ([#16489](https://redirect.github.com/netty/netty/issues/16489))
* [`893ea2e`](netty/netty@893ea2e) Allocate less in QueryStringDecoder.addParam for typical use case ([#16527](https://redirect.github.com/netty/netty/issues/16527))
* Additional commits viewable in [compare view](netty/netty@netty-4.2.10.Final...netty-4.2.12.Final)
  
Updates `io.netty:netty-handler` from 4.2.10.Final to 4.2.12.Final
Release notes

*Sourced from [io.netty:netty-handler's releases](https://github.com/netty/netty/releases).*

> netty-4.2.12.Final
> ------------------
>
> What's Changed
> --------------
>
> * Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16550](https://redirect.github.com/netty/netty/pull/16550)
>
> **Full Changelog**: <netty/netty@netty-4.2.11.Final...netty-4.2.12.Final>
>
> netty-4.2.11.Final
> ------------------
>
> Security
> --------
>
> * CVE-2026-33871, [HTTP/2 CONTINUATION Frame Flood Denial of Service](GHSA-w9fj-cfpg-grvv)
> * CVE-2026-33870, [HTTP Request Smuggling via Chunked Extension Quoted-String Parsing](GHSA-pwqr-wmgm-9rr8)
>
> What's Changed
> --------------
>
> * Update to latest JDK 26 EA release by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16230](https://redirect.github.com/netty/netty/pull/16230)
> * HTTP3: Allow to support non-standard HTTP3 settings by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16171](https://redirect.github.com/netty/netty/pull/16171)
> * Fix Incorrect nanos-to-millis conversion in epoll\_wait EINTR retry loop by [`@​adwsingh`](https://github.com/adwsingh) in [netty/netty#16245](https://redirect.github.com/netty/netty/pull/16245)
> * Allocate one large segment and slice for each MsgHdrMemory by [`@​dreamlike-ocean`](https://github.com/dreamlike-ocean) in [netty/netty#16234](https://redirect.github.com/netty/netty/pull/16234)
> * Make RefCntOpenSslContext.deallocate more robust by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16253](https://redirect.github.com/netty/netty/pull/16253)
> * Epoll: Fix excessive CPU usage when Channel is only registered but no… by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16250](https://redirect.github.com/netty/netty/pull/16250)
> * Update to gcc for arm 10.3-2021.07 by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16255](https://redirect.github.com/netty/netty/pull/16255)
> * Add acmeIdentifier extension support to pkitesting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16256](https://redirect.github.com/netty/netty/pull/16256)
> * Update JDK versions to latest patch releases by [`@​m1ngyuan`](https://github.com/m1ngyuan) in [netty/netty#16254](https://redirect.github.com/netty/netty/pull/16254)
> * Avoid allocation in HttpObjectEncoder.addEncodedLengthHex method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16241](https://redirect.github.com/netty/netty/pull/16241)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16269](https://redirect.github.com/netty/netty/pull/16269)
> * Revert "Automatic backporting workflow from 4.1 to 4.2" by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16270](https://redirect.github.com/netty/netty/pull/16270)
> * HTTP2: Correctly account for padding when decompress by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16264](https://redirect.github.com/netty/netty/pull/16264)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16271](https://redirect.github.com/netty/netty/pull/16271)
> * Automatic backporting workflow from 4.1 to 4.2 by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16273](https://redirect.github.com/netty/netty/pull/16273)
> * Backport PRs must be created with personal access tokens by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16276](https://redirect.github.com/netty/netty/pull/16276)
> * Expose QuicSslContextBuilder::sni by [`@​ZeroErrors`](https://github.com/ZeroErrors) in [netty/netty#16178](https://redirect.github.com/netty/netty/pull/16178)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16275](https://redirect.github.com/netty/netty/pull/16275)
> * Add more porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16283](https://redirect.github.com/netty/netty/pull/16283)
> * Remove the unpooled allocator from test permutations by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16282](https://redirect.github.com/netty/netty/pull/16282)
> * Some polishing of the porting workflows by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16288](https://redirect.github.com/netty/netty/pull/16288)
> * Allow to set destination connection id when creating a client side QuicheChannel by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16286](https://redirect.github.com/netty/netty/pull/16286)
> * Update to latest JDK26 EA build by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16295](https://redirect.github.com/netty/netty/pull/16295)
> * Add javadoc to clarify responsibility of the user when generating the remote connection id by [`@​normanmaurer`](https://github.com/normanmaurer) in [netty/netty#16293](https://redirect.github.com/netty/netty/pull/16293)
> * Make the build run faster by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16290](https://redirect.github.com/netty/netty/pull/16290)
> * Fix IDE warnings in SslHandler by [`@​doom369`](https://github.com/doom369) in [netty/netty#16237](https://redirect.github.com/netty/netty/pull/16237)
> * Decrease Long allocations and map.put calls in ReferenceCountedOpenSllEngine in handshake() method by [`@​doom369`](https://github.com/doom369) in [netty/netty#16242](https://redirect.github.com/netty/netty/pull/16242)
> * Support boringssl SSLCredential API by [`@​jmcrawford45`](https://github.com/jmcrawford45) in [netty/netty#15919](https://redirect.github.com/netty/netty/pull/15919)
> * Fix high-order bit aliasing in HttpUtil.validateToken by [`@​furkanvarol`](https://github.com/furkanvarol) in [netty/netty#16279](https://redirect.github.com/netty/netty/pull/16279)
> * Improve multi-byte access performance when UNALIGNED availability is unknown by [`@​Songdoeon`](https://github.com/Songdoeon) in [netty/netty#16207](https://redirect.github.com/netty/netty/pull/16207)
> * Avoid unnecessary SSL.getVersion() call and string allocation in ReferenceCountedOpenSslEngine by [`@​doom369`](https://github.com/doom369) in [netty/netty#16278](https://redirect.github.com/netty/netty/pull/16278)
> * Support more branch freedom for auto-porting by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16300](https://redirect.github.com/netty/netty/pull/16300)
> * fix: the precedence of + is higher than >> by [`@​cuiweixie`](https://github.com/cuiweixie) in [netty/netty#16312](https://redirect.github.com/netty/netty/pull/16312)
> * AdaptiveByteBufAllocator: make sure byteBuf.capacity() not greater than byteBuf.maxCapacity() by [`@​laosijikaichele`](https://github.com/laosijikaichele) in [netty/netty#16309](https://redirect.github.com/netty/netty/pull/16309)
> * Fix flaky PooledByteBufAllocatorTest by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16313](https://redirect.github.com/netty/netty/pull/16313)
> * Fix pooled arena accounting tests by [`@​chrisvest`](https://github.com/chrisvest) in [netty/netty#16321](https://redirect.github.com/netty/netty/pull/16321)

... (truncated)


Commits

* [`67ce541`](netty/netty@67ce541) [maven-release-plugin] prepare release netty-4.2.12.Final
* [`7074624`](netty/netty@7074624) Revert "Eliminate redundant bounds checks in CompositeByteBuf accessors" ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`c3b0a43`](netty/netty@c3b0a43) [maven-release-plugin] prepare for next development iteration
* [`c94a818`](netty/netty@c94a818) [maven-release-plugin] prepare release netty-4.2.11.Final
* [`3b76df1`](netty/netty@3b76df1) Merge commit from fork
* [`aae944a`](netty/netty@aae944a) Auto-port 4.2: Limit the number of Continuation frames per HTTP2 Headers ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`6001499`](netty/netty@6001499) Eliminate redundant bounds checks in CompositeByteBuf accessors ([#16525](https://redirect.github.com/netty/netty/issues/16525))
* [`a7fbb6f`](netty/netty@a7fbb6f) JdkZlibDecoder: accumulate decompressed output before firing channelRead ([#16](https://redirect.github.com/netty/netty/issues/16)...
* [`7937553`](netty/netty@7937553) Enforce io.netty.maxDirectMemory accounting on all Java versions ([#16489](https://redirect.github.com/netty/netty/issues/16489))
* [`893ea2e`](netty/netty@893ea2e) Allocate less in QueryStringDecoder.addParam for typical use case ([#16527](https://redirect.github.com/netty/netty/issues/16527))
* Additional commits viewable in [compare view](netty/netty@netty-4.2.10.Final...netty-4.2.12.Final)
  
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Reviewers

@chrisvest chrisvest chrisvest approved these changes

@yawkat yawkat Awaiting requested review from yawkat

@franz1981 franz1981 Awaiting requested review from franz1981

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Epoll channel register creates a busy-loop with high CPU usage

4 participants

@normanmaurer @isaacrivriv @chrisvest @franz1981