Public bug reported:
Since upgrading to Ubuntu noble, I've noticed that the tmux server
stalls when zooming the active pane (prefix + z). Using top -p
${tmux_server_pid} its easy to see that the server will sometimes
consume as high as 60% CPU when servicing this zoom pane operation.
Rebuilding tmux from upstream the current 3.4 tag doesn't seem to experience
this issue:
```
ddelnano@dev-vm:~/code/tmux ((3.4)) $ git rev-parse HEAD
9ae69c3795ab5ef6b4d760f6398cd9281151f632
```
I've collected flame graphs of the buggy upstream version and a self
built 3.4 binary attached to this report.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: tmux 3.4-1build1 [modified: usr/bin/tmux]
ProcVersionSignature: Ubuntu 6.8.0-1007.7-gcp 6.8.1
Uname: Linux 6.8.0-1007-gcp x86_64
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudBuildName: server
CloudID: gce
CloudName: gce
CloudPlatform: gce
CloudRegion: us-west1
CloudSerial: 20240423
CloudSubPlatform: metadata (http://metadata.google.internal/computeMetadata/v1/)
Date: Thu May 23 13:58:20 2024
SourcePackage: tmux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: tmux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug cloud-image noble
** Attachment added: "Flame graph of upstream (noble) tmux 3.4"
https://bugs.launchpad.net/bugs/2066914/+attachment/5781859/+files/perf-3.4-u24.svg
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https://bugs.launchpad.net/bugs/2066914
Title:
tmux 3.4 stalls during active pane zoom
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