[eersnington]

Fixes #2052.

A long-lived sidecar, including the default shared one, failed every call with SidecarEventBufferOverflow after about 2048 VM create/dispose cycles.

• Each dispose emits vm_lifecycle disposing and disposed after the VM's event loop has stopped, so no waiter claims them. The client buffered them forever: 4096 / 2 = 2048 VMs.
• When a VM's final disposed event arrives unclaimed, the buffer now releases every buffered event for that VM. A waiter that is already registered still receives the event.
• SidecarEventBufferOverflow is exported from @rivet-dev/agentos-core and secure-exec.
• The Rust client is not affected: it fans events out through a bounded broadcast channel.

2100 create → evaluate → dispose cycles, one sidecar	main	This PR
Result	overflow at cycle 2048	all 2100 succeed

[railway-app]

This PR was not deployed automatically as @eersnington does not have access to the Railway project.

In order to get automatic PR deploys, please add @eersnington to your workspace on Railway.

[github-actions]

📟 Pip-Boy · 04f0b6e

📦 Packages · fresh npm install resolve, no lockfile · this PR vs base

package (linux-x64-gnu)	@latest	base	this PR	Δ vs base	packages
@rivet-dev/agentos-core	458.2 MB	458.2 MB	458.2 MB	+1.1 KB (+0.0%)	121 (0)

`@rivet-dev/agentos-core` details

platform	base	this PR	Δ
linux-x64-gnu	458.2 MB	458.2 MB	+1.1 KB (+0.0%)
linux-arm64-gnu	455.4 MB	455.4 MB	+1.1 KB (+0.0%)
darwin-arm64	434.7 MB	434.7 MB	+1.1 KB (+0.0%)
darwin-x64	444.2 MB	444.2 MB	+1.1 KB (+0.0%)
win32-x64	314.6 MB	314.6 MB	+1.1 KB (+0.0%)

Entrypoints (own code, minified; third-party imports excluded)

entrypoint	base	this PR	Δ	imports	exports
.	291.3 KB	291.6 KB	+324 B (+0.1%)	—	+SidecarEventBufferOverflow

All 6 packages · linux-x64-gnu

package (linux-x64-gnu)	@latest	base	this PR	Δ vs base	packages
@rivet-dev/agentos-core	458.2 MB	458.2 MB	458.2 MB	+1.1 KB (+0.0%)	121 (0)
@rivet-dev/agentos-node-pty	7.6 KB	18.0 KB	18.0 KB	0	1 (0)
@rivet-dev/agentos-posix	253.6 MB	253.6 MB	253.6 MB	+909 B (+0.0%)	7 (0)
@rivet-dev/agentos-runtime-core	253.6 MB	253.6 MB	253.6 MB	+909 B (+0.0%)	6 (0)
@rivet-dev/agentos-sandbox	495.5 MB	495.5 MB	495.5 MB	+1.1 KB (+0.0%)	177 (0)
@rivet-dev/agentos-toolchain	130.8 KB	141.2 KB	141.2 KB	0	2 (0)

🧹 Rust dependencies

Skipped: this PR doesn't change any Rust code or dependencies.

🦀 Binaries

Skipped: this PR doesn't change any Rust code.

⏱ Timing

job	wall time	slowest step
zizmor	8s	checkout · 2s
changes	29s	checkout · 25s
footprint	2m01s	Pack this commit · 41s
⏭ self-test	—	skipped
⏭ hygiene	—	skipped
⏭ native · ${{ matrix.platform }}	—	skipped
report	17s	setup-node · 4s

🔭 Full CI trace for this commit

One OpenTelemetry trace of CI and Pip-Boy for 04f0b6e: every job and step, with the sizes above attached. Run after CI finishes.

pnpm install --frozen-lockfile --filter 'pipboy...'
pnpm --filter pipboy pipboy trace --sha 04f0b6e8d0e5b261fac9be356eb74c0780a119fc

Add --otlp <url> to send it to any OTLP/HTTP collector.

Agent instruction: From a rivet-dev/agentos checkout, run the commands above, then read the trace file the last command prints. List the slowest jobs and steps and explain where CI time went.