From b24d2b8a213c09b511478e7eab5fa343e4a198de Mon Sep 17 00:00:00 2001 From: Andrew Turner Date: Mon, 21 Oct 2019 13:25:55 +0100 Subject: vm: Get debug information when FreeBSD on panics (#1470) The FreeBSD kernel debugger can provide more information when the kernel panics. Add support to bhybe and gce to print this information. --- vm/vmimpl/freebsd.go | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 vm/vmimpl/freebsd.go (limited to 'vm/vmimpl') diff --git a/vm/vmimpl/freebsd.go b/vm/vmimpl/freebsd.go new file mode 100644 index 000000000..c6074028a --- /dev/null +++ b/vm/vmimpl/freebsd.go @@ -0,0 +1,32 @@ +// Copyright 2018 syzkaller project authors. All rights reserved. +// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file. + +package vmimpl + +import ( + "io" + "time" +) + +// DiagnoseFreeBSD sends the debug commands to the given writer which +// is expected to be connected to a panicked FreeBSD kernel. If kernel +// just hanged, we've lost connection or detected some non-panic +// error, console still shows normal login prompt. +func DiagnoseFreeBSD(w io.Writer) bool { + commands := []string{ + "", + "set $lines = 0", // disable pagination + "set $maxwidth = 0", // disable line continuation + "show registers", + "show proc", + "ps", + "show all locks", + "show malloc", + "show ktr", + } + for _, c := range commands { + w.Write([]byte(c + "\n")) + time.Sleep(1 * time.Second) + } + return true +} -- cgit mrf-deployment