[Bug]: The worker pool will panic with WithPreAlloc(true)

[arloliu]

Actions I've taken before I'm here

• I've thoroughly read the documentations on this issue but still have no clue.
• I've searched the current list of Github issues but didn't find any duplicate issues that have been solved.
• I've searched the internet with this issue, but haven't found anything helpful.

What happened?

When creating worker pool with latest v2.11.1, regardless using multi pool or single pool.
The option WithPreAlloc(true) will cause panic runtime error: index out of range [0] with length 0 when call ReleaseWithTimeout() first, then call Reboot to reboot released pool.

E.g.,

workerPool.ReleaseTimeout(time.Second)
workerPool.Reboot()

It happens on worker_loop_queue.go:70, loopQueue.insert method.

Major version of ants

v2

Specific version of ants

v2.11.1

Operating system

Linux

OS version

Debian

Go version

go1.23.2

Relevant log output

[ants]: worker exits from panic: runtime error: index out of range [0] with length 0
goroutine 214 [running]:
runtime/debug.Stack()
        /home/arlo/.gvm/gos/go1.23.2/src/runtime/debug/stack.go:26 +0x67
github.com/panjf2000/ants/v2.(*goWorkerWithFuncGeneric[...]).run.func1.1()
        /home/arlo/.gvm/pkgsets/go1.23.2/global/pkg/mod/github.com/panjf2000/ants/[email protected]/worker_func_generic.go:65 +0x2a5
panic({0x1460f60?, 0xc000416600?})
        /home/arlo/.gvm/gos/go1.23.2/src/runtime/panic.go:785 +0x132
github.com/panjf2000/ants/v2.(*loopQueue).insert(0xc00042e6e0, {0x16bf5b0, 0xc0002c8200})
        /home/arlo/.gvm/pkgsets/go1.23.2/global/pkg/mod/github.com/panjf2000/ants/[email protected]/worker_loop_queue.go:70 +0x205
github.com/panjf2000/ants/v2.(*poolCommon).revertWorker(0xc00044ab60, {0x16bf5b0, 0xc0002c8200})
        /home/arlo/.gvm/pkgsets/go1.23.2/global/pkg/mod/github.com/panjf2000/ants/[email protected]/ants.go:516 +0x182
github.com/panjf2000/ants/v2.(*goWorkerWithFuncGeneric[...]).run.func1()
        /home/arlo/.gvm/pkgsets/go1.23.2/global/pkg/mod/github.com/panjf2000/ants/[email protected]/worker_func_generic.go:78 +0x276
created by github.com/panjf2000/ants/v2.(*goWorkerWithFuncGeneric[...]).run in goroutine 19
        /home/arlo/.gvm/pkgsets/go1.23.2/global/pkg/mod/github.com/panjf2000/ants/[email protected]/worker_func_generic.go:53 +0x111

Reproducer

How to Reproduce

Steps to reproduce the behavior:

1. Go to '....'
2. Click on '....'
3. Do '....'
4. See '....'

Does this issue reproduce with the latest release?

It can reproduce with the latest release

[panjf2000]

Did you make sure that ReleaseTimeout() didn't return a non-nil error before calling Reboot()?

Please provide a go program that can reproduce this issue.

[POABOB]

@panjf2000 I found the bug and submitted a PR #360. Please take a look~