Date: Sun, 22 Jun 2025 03:58:12 GMT From: Ahmad Khalifa <vexeduxr@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 2e91875bc2d8 - main - libkvm/kvm_open.3: document broken full dumps Message-ID: <202506220358.55M3wCb8041072@gitrepo.freebsd.org>
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The branch main has been updated by vexeduxr: URL: https://cgit.FreeBSD.org/src/commit/?id=2e91875bc2d861ce3b8f3e893dca999d139f590e commit 2e91875bc2d861ce3b8f3e893dca999d139f590e Author: Ahmad Khalifa <vexeduxr@FreeBSD.org> AuthorDate: 2025-05-22 12:44:57 +0000 Commit: Ahmad Khalifa <vexeduxr@FreeBSD.org> CommitDate: 2025-06-22 03:49:32 +0000 libkvm/kvm_open.3: document broken full dumps Starting 13.1 the amd64 kernel was made relocatable, but the kernel didn't provide enough information for libkvm to figure out where it was loaded. Reviewed by: markj Approved by: imp (mentor) Pull Request: https://github.com/freebsd/freebsd-src/pull/1706 Closes: https://github.com/freebsd/freebsd-src/pull/1706 --- lib/libkvm/kvm_open.3 | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/lib/libkvm/kvm_open.3 b/lib/libkvm/kvm_open.3 index a7e428748215..9a32719d537b 100644 --- a/lib/libkvm/kvm_open.3 +++ b/lib/libkvm/kvm_open.3 @@ -29,7 +29,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd March 20, 2017 +.Dd June 22, 2025 .Dt KVM_OPEN 3 .Os .Sh NAME @@ -245,7 +245,20 @@ The value passed via was .Dv NULL . .El +.Sh NOTE +Full memory dumps taken on 13.x (excluding 13.0) and 14.x amd64 kernels +will cause both +.Fn kvm_open +and +.Fn kvm_open2 +to fail since they do not provide sufficient information to figure out +where in physical memory the kernel was loaded. +Full memory dumps have to be explicitly enabled by setting the +.Va debug.minidump +.Xr sysctl 8 +to 0. .Sh SEE ALSO +.Xr dumpon 8 , .Xr close 2 , .Xr open 2 , .Xr kvm 3 ,
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