November 2009 - Darwin-kernel

Re: remote debugging with gdb on 10.6.2
by Brian Bechtel 22 Nov '09

22 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=Sa/FsMOjCHbKEeV8KQzPDS81e6MCBZOpR7Yr9u5OB3I=; b=esDkBCQYVoxUEwLpeWeJfWUQZwV5+kqop4BJKhtLP1ImiKVlt9voTaujlDf88CK5T+ K5UAaelmH8cY2mImKszc/IjP+RQRlLvUsBtdg1IqSSIklYNr5pk+hqAhdeZZiYBm2MFr jx5a8QFF6amX29HasV3Ecw04Yom0IzvhSHfu8= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=a9tgN9oZBTONO84+v6tPLSUDMflGf2nQxah8xAeQ7dV2YU7W9d9L6gE8sY1lqyWaRl I/4t4bee8XwBHFVfc9RxhJyv6OFuMPiLGBgXvIORe27qHpVYQTrBAFixpy5O23NBgkZ7 +VxwdSpCU+RPmElO1cEwEZk/YddHtbU/bObmc= On Fri, Nov 20, 2009 at 1:06 PM, mogambo <mogambo13(a)gmail.com> wrote: > Hi, > I want to do remote debugging on 10.6.2 system. I found the following link > about remote kernel debugging. I tried using the default kernel, rather than > building my own and use mach_kernel in the debug kit. You should use the Kernel Debug Kit, found at developer.apple.com/sdk. Mount the disk image Apple provides, then issue the command gdb -arch i386 /Volumes/KernelDebugKit/mach_kernel inside gdb, issue the command source /Volumes/KernelDebugKit/kgmacros > However, when I issue > attach <ip> command in the gdb, remote_connect keeps timing out. The > boot-args on the target contains debug=0xd44. It should be debug=0x144, rather than debug=0xd44. The additional bits you've set are defined in technote 2118, "Kernel Core Dumps" at http://developer.apple.com/mac/library/technotes/tn2004/tn2118.html setting DB_KERN_DUMP_ON_PANIC means that you'll attempt to send a core to the IP address in the boot-args argument _panicd_ip. Since you probably haven't set that, you're probably confusing things. The quick summary of 2 machine debugging is: For ethernet connections, on the panicking machine: % sudo nvram boot-args="debug=0x144" reboot to let this new setting take affect. Panic the machine, or NMI the machine by pressing the power key. On the host machine, download the Kernel Debug Kit from http://developer.apple.com/sdk, or use the search function on developer.apple.com to find the appropriate Kernel Debug Kit which matches the operating system version on the panicking machine. Mount the Kernel Debug Kit image to create /Volumes/KernelDebugKit % gdb -arch i386 /Volumes/KernelDebugKit/mach_kernel (gdb) source /Volumes/KernelDebugKit/kgmacros (gdb) kdp-reattach {ip address or name of panicking machine} For firewire connections in Leopard or later, on the panicking machine: % sudo nvram boot-args="debug=0x144 kdp_match_name=firewire" reboot to let this new setting take affect. Panic the machine, or NMI the machine by pressing the power key. On the host machine, download the Kernel Debug Kit from http://developer.apple.com/sdk, or use the search function on developer.apple.com to find the appropriate Kernel Debug Kit which matches the operating system version on the panicking machine. Mount the Kernel Debug Kit image to create /Volumes/KernelDebugKit In a terminal window, invoke fwkdp % fwkdp Leave that window open, and in another window, load gdb % gdb -arch i386 /Volumes/KernelDebugKit/mach_kernel (gdb) source /Volumes/KernelDebugKit/kgmacros (gdb) kdp-reattach localhost fwkdp redirects your gdb session so that gdb acts as if the host machine was panicked. It isn't, of course, but the fwkdp session gives you access to everything on the panicking machine. Good luck _______________________________________________ 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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remote debugging with gdb on 10.6.2
by mogambo 20 Nov '09

20 Nov '09

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Re: Target system locks when single stepping in GDB kernel debug session
by Duane Murphy 17 Nov '09

17 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'll jump in this band wagon. I see this regularly. It is very frustrating to take 10-15 minutes to setup a two-machine debugging session only to have stepping shut down the entire session. Yes, I can verify that this happens regularly. On Nov 17, 2009, at 3:17 PM, Joe Lowe wrote: > > The break/continue, advance, and stepi commands work fine. I would > expect whatever technical difficulties there are with implementing > source level single stepping would to some extent affect these other > commands. > > I guess maybe a better question: Can anyone confirm that they use > ethernet kernel debugging with OSX and are able to single step > hrough source without the debuggee sometimes locking up? > > Joe > > > James Shimer wrote: >> There are special hardware debugging tools used for debugging >> schedulers, In Circuit Emulation (ICE) and JTAG. With out them, I >> think your subject to catch 22 between debugger scheduling and your >> "step over" break point causing deadlock. >> On Nov 9, 2009, at 12:32 PM, Joe Lowe wrote: >>> I am using GDB kernel debugging over ethernet. >>> Whenever I single step over a function call the target >>> system locks up and never returns to the debugger. The >>> keyboard debug break sequence and power button do not >>> help once in this state. The target machine has to be >>> power cycled. >>> >>> Target system is a quad core intel based mac running >>> OSX 10.5.8. The GDB version on the debugger system is >>> "GNU gdb 6.3.50-20050815 (Apple version gdb-966) >>> (Tue Mar 10 02:43:13 UTC 2009)", using the 10.5.8 >>> kernel debug kit. The debugger is fully functional >>> except for the single stepping issue. >>> >>> Has anyone else seen this or have any idea what might >>> be the cause? >>> >>> Joe >>> _______________________________________________ >>> 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/jamesshimer%40mac.com >>> >>> This email sent to jamesshimer(a)mac.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/duanemurphy%40mac.com > > This email sent to duanemurphy(a)mac.com ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBSwM36Urg9acQ4r2CAQhAuwf/ZmeTdmx2DgLpLeBuyTVVX0CepcOuQDoP ZNwIVAE9KYm8aREHRzs4CHMEQwXDWJy8d0hx9Afg363BsXKJn84mpSKjs8ur9+oT AYRmMI1rTSdlNHCafVrDzxub3LW2//Ph57UJp/3jUd+C/TthYC17VMxJEigf495D l4r4cx0C0dc4ZESPqO1nvbUllr7jryAqpM33DaYyGOxusUGvSJVJCWFtf2gca13e 1tj4UfkeQSk7rXCQWVdZSXbXphAf+sJEaS5w8Q6dQQscIB/jCctthYVbLLe8U0FZ rxQ48GejG/yZZ3Kr2AQcpFvYsjCb3MV2C1OEEOHs6Ov9F62OIoExuw== =cbDh -----END PGP SIGNATURE----- _______________________________________________ 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: Target system locks when single stepping in GDB kernel debug session
by Joe Lowe 17 Nov '09

17 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.23 (Macintosh/20090812) Joe On Nov 9, 2009, at 12:32 PM, Joe Lowe wrote: I am using GDB kernel debugging over ethernet. Whenever I single step over a function call the target system locks up and never returns to the debugger. The keyboard debug break sequence and power button do not help once in this state. The target machine has to be power cycled. Target system is a quad core intel based mac running OSX 10.5.8. The GDB version on the debugger system is "GNU gdb 6.3.50-20050815 (Apple version gdb-966) (Tue Mar 10 02:43:13 UTC 2009)", using the 10.5.8 kernel debug kit. The debugger is fully functional except for the single stepping issue. Has anyone else seen this or have any idea what might be the cause? _______________________________________________ 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.… The break/continue, advance, and stepi commands work fine. I would expect whatever technical difficulties there are with implementing source level single stepping would to some extent affect these other commands. I guess maybe a better question: Can anyone confirm that they use ethernet kernel debugging with OSX and are able to single step hrough source without the debuggee sometimes locking up? James Shimer wrote: There are special hardware debugging tools used for debugging schedulers, In Circuit Emulation (ICE) and JTAG. With out them, I think your subject to catch 22 between debugger scheduling and your "step over" break point causing deadlock. Joe _______________________________________________ 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/jamesshimer%40mac.com This email sent to jamesshimer(a)mac.com This email sent to site_archiver(a)lists.apple.com

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Re: Serious Interruptive Pauses
by Todd Heberlein 17 Nov '09

17 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com > The open/close dialog suggests that you may have one or more disks in your system spinning down. I get this all the time (I have 3 internal disks and 2 external disks), fortunately I can hear the disk spinning up so I know what is happening. I just wish there was a visual indicator to the user as to what is going on, because otherwise the program just looks like it is hung. When I do demos for people or screencasts, I turn off "Put the hard disk(s) to sleep when possible" in the Energy Saver panel. Todd _______________________________________________ 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: Serious Interruptive Pauses
by George Plymale 17 Nov '09

17 Nov '09

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Re: Serious Interruptive Pauses
by Michael Smith 17 Nov '09

17 Nov '09

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Serious Interruptive Pauses
by George Plymale 17 Nov '09

17 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I am experiencing very odd pauses throughout the operating system. It appears as though they are more frequent with open/save dialogs. Any ideas as to how to track down the culprit appropriately? Thanks, -George _______________________________________________ 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: pmap_flush_tlbs() timeout
by Michael Smith 14 Nov '09

14 Nov '09

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pmap_flush_tlbs() timeout
by Mike Valley 13 Nov '09

13 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcpkuZKLFuabzMVCRoqOq/fVvifwpQ== Thread-topic: pmap_flush_tlbs() timeout _______________________________________________ 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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