lighter 0.12.3
A network drive on the Mac that stops answering no longer freezes lighter's machine, and a device that calls a published UDP port over an IPv6 link-local address (fe80::) now gets an answer.
What went wrong
A hung network drive froze part of the machine. lighter answers a file request on the CPU that asked for it when nothing else is waiting, which is faster than handing it to a worker. A request on a network drive (SMB, NFS, AFP, WebDAV) that had stopped answering then stopped that CPU for as long as the drive did: with a NAS hung for 48 seconds, three of the machine's CPUs stopped, one for 40 seconds, and any container on them stopped too, whatever it was doing. And with enough requests waiting on that drive at once, every worker of the shared folder it was in was waiting too, so even files on the Mac's own disk in the same folder went unanswered: 38.7 seconds in one test.
A link-local IPv6 caller got no answer over UDP. lighter passes each caller's own address to a published port, so a DNS server such as Pi-hole or Technitium sees which device is asking. A link-local IPv6 address cannot be passed on: it only means something on the Mac's own network, and a container's reply to it would never leave the container. Over TCP such a caller was shown as lighter's own address, as a caller on the Mac itself is. Over UDP it was not shown at all: the datagram was dropped, and the caller got no answer.
What changed
- Only requests on the Mac's own disks are answered on the CPU that asked. A request on a network drive goes to a worker, and at most a quarter of a shared folder's workers wait on such drives at once, so a drive that hangs holds up only what is waiting for it: with the same NAS hung for 48 seconds, no CPU stopped, and a file on the Mac's own disk in the same folder still answered at once. Requests on the Mac's own disks are as fast as before.
- A link-local IPv6 caller is answered over UDP as well as TCP, and shown as lighter's own address, as a caller on the Mac itself is. Callers on IPv4 and on global IPv6 addresses are shown as themselves, as before.
Upgrading
brew upgrade lighter
lighter restart
Or lighter update download then lighter upgrade --restart if you installed with the install script.
Also
- Linux remains 6.18.52 (kernel f4dfc278). The data epoch remains 1.
Checksums
lighter-0.12.3-arm64.tar.gz: SHA2560a0c88211a89b69293c7f46a12e68af8fb58f60a31cf0dedf648178e451853c2lighter-0.12.3-arm64(installer bootstrap): SHA25605e77c133b2baf741c2f3798a667aae3774d8310d05d3ce17d168e3c05f30dce- Kernel f4dfc278, rootfs 8dbbd78f. Notarization 6274c29c accepted.