November 2004 - Darwin-kernel

Re: single machine debugging?/advice for noob on OS X panic analysis
by Garth Cummings 02 Nov '04

02 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Eric, On Nov 1, 2004, at 10:53 AM, Eric R Johnson wrote: Hi, I'm trying to lend a hand in troubleshooting a persistent kernel panic problem that's associated with the open source p2p bittorrent client, Azureus. In the past, I've done a little crash analysis on Solaris but I'm new to OS X and have alot of questions. If you're going to be annoyed by noob questions, please delete. Thanks in advance to anyone that can help. Azureus is written in Java and uses direct memory access for some of its networking and disk functions. http://azureus.sourceforge.net/wiki/index.php/MemoryUsage (It seems odd to me that a Java app could panic the kernel. But maybe the DMA code by-passes the JVM's memory management and therefore coding errors could cause the panics we're seeing. Any insights?) Anyway... I've read the kernel programming docs and kbase articles on panic analysis, but I've had a hard time getting started because the only intro-level doc I've seen assumes the a two-machine setup. Unfortunately, my wife has only allowed me one Mac (so far)... I'd like to try to my hand at doing some panic analysis if I can get past the single-machine limitation. In the past, I've worked on Solaris boxes and was able to use adb from a terminal on a system core dump in the /var/crash directory. Can I configure OS X to savecore in a filesystem directory and use gdb on it? Maybe this is described somewhere and I just missed it? Aside from the Apple developer and kbase docs, does anyone have any reference material they recommend on the panic analysis? I think I have a copy of Chris Drake's "Panic!" lying around somewhere. Any other references, online or otherwise, would be helpful. Thanks for any and all pointers, advice, RTFMs, etc. Good luck, --gc __________________________________________________________________ Garth Cummings Apple Developer Technical Support gcummings(a)apple.com http://developer.apple.com/technicalsupport _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com For the curious and benificent, there's a sourceforge thread that describes the issue at the URL below. I'm wondering if there's anything in the panic.log outputs that jumps out. From what I've gleaned, it looks like Azureus or the JVM is accessing a memory address in kernel land that is out of bounds... http://sourceforge.net/forum/forum.php? thread_id=1146956&forum_id=291997 --EJ Take a look at Technical Note 2063 <http://developer.apple.com/technotes/tn2002/tn2063.html>, titled "Understanding and Debugging Kernel Panics." This TN shows how to generate a useful backtrace from a panic log on a single machine. smime.p7s

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Re: single machine debugging?/advice for noob on OS X panic analysis
by Rohan Lloyd 02 Nov '04

02 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 2 Nov 2004, at 5:53 AM, Eric R Johnson wrote: Anyway... I've read the kernel programming docs and kbase articles on panic analysis, but I've had a hard time getting started because the only intro-level doc I've seen assumes the a two-machine setup. Unfortunately, my wife has only allowed me one Mac (so far)... I followed the instructions I found at: http://www.hta-bi.bfh.ch/~riepg/misc_cross.html -- Rohan Lloyd _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… It you have another machine (Linux?) available, it's possible (albeit non trivial) to set up 2 machine debugging from it. and successfully compiled a version of gdb, that I could use to remotely debug a Mac from a SuSe Linux box. This email sent to site_archiver(a)lists.apple.com

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Re: Darwin-kernel Digest, Vol 1, Issue 38
by David Gatwood 01 Nov '04

01 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: [little OT] Students at WWDC and Tiger
by Matt Jaffa 01 Nov '04

01 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com nvm, Sorry directing the question to ADC support, shouldn't ask the lists Matt On Nov 1, 2004, at 1:33 PM, Matt Jaffa wrote: Hi, for anyone at Apple that can answer. Or am I going to have to become a select member to get this new build? Thanks, Matt This email sent to matt(a)knowligent.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I went to WWDC on a student scholarship and got a distribution of Tiger there. Now I hear they just released a new build of it to Select and Premeir members today. Are those who went to WWDC going to receive it at all? Or is it just students they are excluding. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/ matt%40knowligent.com This email sent to site_archiver(a)lists.apple.com

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[little OT] Students at WWDC and Tiger
by Matt Jaffa 01 Nov '04

01 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, for anyone at Apple that can answer. Or am I going to have to become a select member to get this new build? Thanks, Matt _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I went to WWDC on a student scholarship and got a distribution of Tiger there. Now I hear they just released a new build of it to Select and Premeir members today. Are those who went to WWDC going to receive it at all? Or is it just students they are excluding. This email sent to site_archiver(a)lists.apple.com

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Re: single machine debugging?/advice for noob on OS X panic analysis
by Andrew Gallatin 01 Nov '04

01 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Eric R Johnson writes: > > I'd like to try to my hand at doing some panic analysis if I can get > past the single-machine limitation. In the past, I've worked on > Solaris boxes and was able to use adb from a terminal on a system > core dump in the /var/crash directory. Can I configure OS X to > savecore in a filesystem directory and use gdb on it? Maybe this > is described somewhere and I just missed it? > Nope, the lack of local crashdumps is a real source of frustration for me. Starting with 10.3, you can at least save a crashdump to a remote machine. See TN2118: http://developer.apple.com/technotes/tn2004/tn2118.html for instructions on how to set the mac up. You'll need to obtain the source to kdumpd from the network_cmds darwin project. Its just a modified tftpd, so porting it is easy. I run it on FreeBSD. You should also check out http://developer.apple.com/documentation/Darwin/Conceptual/KernelProgrammin… and http://developer.apple.com/technotes/tn2002/tn2063.html If you download the kernel debug kit, you get a nice set of gdb macros to do some of the cool things that adb can do (like showing all stacks), plus better kernel (and kext) synmbol info. Drew _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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single machine debugging?/advice for noob on OS X panic analysis
by Eric R Johnson 01 Nov '04

01 Nov '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, I'm trying to lend a hand in troubleshooting a persistent kernel panic problem that's associated with the open source p2p bittorrent client, Azureus. In the past, I've done a little crash analysis on Solaris but I'm new to OS X and have alot of questions. If you're going to be annoyed by noob questions, please delete. Thanks in advance to anyone that can help. Azureus is written in Java and uses direct memory access for some of its networking and disk functions. http://azureus.sourceforge.net/wiki/index.php/MemoryUsage (It seems odd to me that a Java app could panic the kernel. But maybe the DMA code by-passes the JVM's memory management and therefore coding errors could cause the panics we're seeing. Any insights?) Anyway... I've read the kernel programming docs and kbase articles on panic analysis, but I've had a hard time getting started because the only intro-level doc I've seen assumes the a two-machine setup. Unfortunately, my wife has only allowed me one Mac (so far)... I'd like to try to my hand at doing some panic analysis if I can get past the single-machine limitation. In the past, I've worked on Solaris boxes and was able to use adb from a terminal on a system core dump in the /var/crash directory. Can I configure OS X to savecore in a filesystem directory and use gdb on it? Maybe this is described somewhere and I just missed it? Aside from the Apple developer and kbase docs, does anyone have any reference material they recommend on the panic analysis? I think I have a copy of Chris Drake's "Panic!" lying around somewhere. Any other references, online or otherwise, would be helpful. http://sourceforge.net/forum/forum.php?thread_id=1146956&forum_id=291997 Thanks for any and all pointers, advice, RTFMs, etc. --EJ _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… For the curious and benificent, there's a sourceforge thread that describes the issue at the URL below. I'm wondering if there's anything in the panic.log outputs that jumps out. From what I've gleaned, it looks like Azureus or the JVM is accessing a memory address in kernel land that is out of bounds... This email sent to site_archiver(a)lists.apple.com

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