site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Does the "PC" in the following line refer to a line number in code? -- Thanks, James Reynolds University of Utah Student Computing Labs james@scl.utah.edu 801-585-9811 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... I have several questions on debugging kernel panics. I hope this isn't asking too much. Because of my work debugging a previous panic, my boss is having me do a presentation tomorrow and webpage on panics, and I thought I understood things well enough to do one, until I got into it, then I realized how much I don't know... Is "unresolved kernel trap" different from "panic(cpu ... caller ...)" because the trap was initiated by the CPU but the panic was initiated by the kernel code? Or is it that certain traps (0x100 to 0x900) are initiated by the CPU and the others are code? Unresolved kernel trap(cpu 0): 0x600 - Alignment DAR=0x0000000001BB5DEE PC=0x00000000000A4F20 So if I have a bunch of panic logs from different computers and they all have the same PC numbers, but different DAR numbers, what does that mean? If I understand correctly, the trap number (0x100-0xF00) refers to the type of error that caused the crash, but doesn't really help figure out what caused the crash. Is that right? How is moving to Intel going to change CPU panics? Will trap numbers stay the same? There is a bit of documentation about debugging the FreeBSD kernel on the web and I'm wondering how similar it is to Darwin. (for example: http://www.onlamp.com/pub/a/bsd/2002/04/04/Big_Scary_Daemons.html http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-troub...) In particular, I read that a core dump is the size of your physical RAM. Does Darwin do the same? I also read that core dumps may contain passwords that were stored in RAM. Is that true of Darwin? I also read that it is possible to setup FreeBSD to save core dumps to the swap partition. Because Darwin doesn't have a swap partition but uses the main partition for swap, is that why Darwin supports kdumpd for remote core dump storing? Does Darwin support saving core dumps to the local hard disk at all (not that I want it, just curious)? This email sent to site_archiver@lists.apple.com