Date: Thu, 31 Oct 2024 18:23:54 -0400 From: Justin Hibbits <jhibbits@FreeBSD.org> To: <freebsd-hackers@FreeBSD.org>, <freebsd-arch@freebsd.org> Subject: Direct dumped kernel cores Message-ID: <20241031182354.14fa48aa@ralga.knownspace>
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Hi everyone, At Juniper we've been using a so-called 'rescue' kernel for dumping vmcores directly to the filesystem after a panic. We're now contributing this feature, implemented by Klara Systems, to FreeBSD, and looking for feedback. I posted a review at https://reviews.freebsd.org/D47358 for anyone interested. Interesting bits to keep in mind: * It requires a 2-stage build process, one to build the rescue kernel, the other to build the main kernel, which embeds the rescue kernel inside its image. This might need some further work. * Thus far it's been implemented for amd64 and arm64, once proven out, other architectures (powerpc64/le, riscv64) can follow suit. * Kernel environment bits to pass down to the rescue kernel are prefixed `debug.rescue.`, for instance `debug.rescue.vfs.root.mountfrom`. There are many more details in the review summary. We'd love to get feedback from anyone interested. Thanks, Justin Hibbits
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