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OrbStack Helper crashes with SIGSEGV inside vmnet on macOS 27.0.1 #2773
Description
Describe the bug
OrbStack 2.2.5, macOS 27.0.1 (26A434), Apple silicon, 8 GB, Rosetta enabled, network_bridge: true.
OrbStack Helper crashed twice on 2026-10-27, at 08:35 and 14:30, with EXC_BAD_ACCESS (KERN_INVALID_ADDRESS). The faulting thread is com.apple.framework.vmnet.interface.* both times, with the same stack:
dispatch_async
vmnet __vmnet_start_interface_block_invoke_3
Netrb ____NETRBClientResponseHandler_block_invoke
Just before the crash, vmgr.log shows scon host bridge failed error="vmnet start timed out". The bad address differs between the two crashes (0x60 and 0x23b2).
Workaround in testing: orb config set network_bridge false. After a restart, the bridge-failure line no longer appears. Crash reports and orb report output attached.
To Reproduce
No response
Expected behavior
No response
Diagnostic report (REQUIRED)
orbstack-helper-crash-0835.txt
orbstack-helper-crash-1430.txt
Screenshots and additional context (optional)
No response
Activity
orbstack-bot commentedon Oct 27, 2026
Hi! Please upload a diagnostic report from the OrbStack menu > Help > Upload Diagnostics (or run
orb report) and then paste the output here. The extra info makes it easier for us to debug issues.It should look like:
(It's safe to post the link publicly — only the OrbStack team can access it.)
CuWilliams commentedon Oct 27, 2026
https://orbstack.dev/_admin/diag/orbstack-diagreport_2026-10-27T17-10-00.175774Z.zip
CuWilliams commentedon Oct 27, 2026
To reproduce: not reliably reproducible. It happened twice on 2026-10-27 (08:35 and 14:30 local, UTC−2:30), both times while OrbStack was starting the bridge network (vmgr.log: "scon host bridge failed: vmnet start timed out"), shortly before the crash.
Expected: OrbStack starts, or logs the vmnet failure, without the Helper crashing.
Workaround in testing:
orb config set network_bridge false, set at about 14:38 the same day. This diagnostic report was taken after that change. I'll report back if the crash happens again with the bridge off.