February 2006 - Darwin-dev - lists.apple.com

Re: Crash report
by Philippe Devallois 15 Feb '06

15 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Bug ID# 4445905 On 14 févr. 06, at 23:05, Brian Bechtel wrote: Hello All, Nobody's perfect, I just received my first crash log from a Coreduo user. Is it a big challenge to dump some bytes around the EBP register to the report? _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On 2/14/06, Philippe Devallois <phdevallois(a)intego.com> wrote: <http://bugreporter.apple.com> This email sent to site_archiver(a)lists.apple.com

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Re: Protected Memory
by Peter Lovell 15 Feb '06

15 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Feb 14, 2006, at 5:51 PM, William Riley-Land wrote: Regards.....Peter _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Hi, I haven't posted here before. So, nice to meet you all and hope this isn't off topic :) I was wondering if it is possible at all for one userland application to access another application's memory space. By "userland" I mean non-kernel code... that's the correct term right? I had a program under OS 9 that could be used to do this (mostly to cheat at games :) I understand that under Darwin memory is "protected" and one application can only use its memory space and/or shared memory (which I have no idea about at all). Anyway, my secondary question is: can one application access another's memory? It's possible for one application to make its memory available to be shared. It's also possible for a privileged process to get access to memory of another process (think of how a debugger might work). The answer depends a lot on just what you mean by "can one application access another's memory?" Can you be a bit more descriptive? This email sent to site_archiver(a)lists.apple.com

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Re: Protected Memory
by Alexander von Below 15 Feb '06

15 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Am 14.02.2006 um 23:51 schrieb William Riley-Land: So, to the community: SHOULD one be able to do that? Alex (1) http://www.ccc.de/congress/2004/index.en.html _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Hi, I haven't posted here before. So, nice to meet you all and hope this isn't off topic :) I was wondering if it is possible at all for one userland application to access another application's memory space. By "userland" I mean non-kernel code... that's the correct term right? I had a program under OS 9 that could be used to do this (mostly to cheat at games :) Yes it is possible. I am somewhat hesitant to post the code here, because I am not sure if it is a "security leak" . The snippet I have was originally intended for the 21c3 (1) This email sent to site_archiver(a)lists.apple.com

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Using too much memory crashes entire machine
by Tor Andre Myrvoll 15 Feb '06

15 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi, Any input is appreciated! -- - Tor André Myrvoll Researcher, Dep. of Electronics and Telecomm., Norwegian University of Science and Technology Crash Dump: ========== _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… I hope this is a proper mailing list for my problem. If not - please redirect me. I have written a piece of simulation software in C++ that relies heavily on the Accelerate framework - in particular the BLAS implementation. The software is compiled for the ppc64 architecture, i.e. 64 bit. I can control how much memory the program uses, but needless to say - the more of my main memory I allow it too use, the faster the BLAS routines run due to the internal threading used in the library. The problem is that if I let the program use 6-7 GB out of my total of 8 GB, the machine will eventually crash (see an example of a crash- dump below. The cpu causing the panic varies from time to time). Note that the machine is not swapping when these crashes occur. Now, I would be willing to blame this on bad memory, but the machine runs weeks on end performing other heavy computational tasks (although in 32-bit mode). The same problem also occurs on a separate dual G5 with 8 GB of memory. So - do anyone have any opinions on what might be going on here? Is it a hardware problem (occuring on both machines), can it be a problem with my software (same setup runs fine on a dual Opteron machine with 8 GB of memory), or is it a problem with OS X/Darwin? panic(cpu 2 caller 0x000A8D80): Uncorrectable machine check: pc = FFFFFFFFFFFF8260, msr = 900000000004F030, dsisr = 00200000, dar = 00000000B0011C00 AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000 L2FIR = 0000000000000000, BusFir = 0000000000000000 Latest stack backtrace for cpu 2: Backtrace: 0x00095718 0x00095C30 0x0002683C 0x000A8D80 0x000A84C8 0x000ABD00 Proceeding back via exception chain: Exception state (sv=0x5849D780) PC=0xFFFF8260; MSR=0x0004F030; DAR=0xB0011C00; DSISR=0x00200000; LR=0x00845194; R1=0x8AD13BB0; XCP=0x00000008 (0x200 - Machine check) Kernel version: Darwin Kernel Version 8.4.0: Tue Jan 3 18:22:10 PST 2006; root:xnu-792.6.56.obj~1/RELEASE_PPCModel: PowerMac11,2, BootROM 5.2.7f1, 4 processors, PowerPC G5 (1.1), 2.5 GHz, 8 GB Graphics: NVIDIA GeForce 6600, GeForce 6600, PCI, 256 MB Memory Module: DIMM0/J6700, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM1/J6800, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM2/J6900, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM3/J7000, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM4/J7100, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM5/J7200, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM6/J7300, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Memory Module: DIMM7/J7400, 1 GB, DDR2 SDRAM ECC, PC2-4200E-444 Network Service: Innebygd Ethernet 1, Ethernet, en0 PCI Card: GeForce 6600, Display, SLOT-1 PCI Card: bcom5714, network, GIGE PCI Card: bcom5714, network, GIGE Serial ATA Device: Hitachi HDS725050KLA360, 465.76 GB Parallel ATA Device: HL-DT-ST DVD-RW GWA-4165B, USB Device: Hub in Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/ sec, 500 mA USB Device: Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 250 mA FireWire Device: unknown_device, unknown_value, Up to 400 Mb/sec This email sent to site_archiver(a)lists.apple.com

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Re: Protected Memory
by Steve Checkoway 14 Feb '06

14 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Feb 14, 2006, at 2:51 PM, William Riley-Land wrote: Hi. - Steve _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com Hi, I haven't posted here before. So, nice to meet you all and hope this isn't off topic :) I was wondering if it is possible at all for one userland application to access another application's memory space. By "userland" I mean non-kernel code... that's the correct term right? I had a program under OS 9 that could be used to do this (mostly to cheat at games :) I understand that under Darwin memory is "protected" and one application can only use its memory space and/or shared memory (which I have no idea about at all). Most modern operating systems do not allow one application to access memory of another application (apart from shared memory which requires the processes to cooperate). Anyway, my secondary question is: can one application access another's memory? In general, the answer is no; however, the debugger is able to do so. Read the man page for ptrace (actually, read the header file /usr/ include/sys/ptrace.h as the man page is missing some information). I am dissapointed that I have to ask this question, but I could not find any sort of in-depth documentation of Darwin's memory management on the Apple site or after doing a bit of Googling... So, my main question is where can I find that sort of information? Not sure where this is documented. I suppose there's something in gdb's source. smime.p7s

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Protected Memory
by William Riley-Land 14 Feb '06

14 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:sender:to:subject:mime-version:content-type; b=T3DE3LxJq9yC7w3qihVwPFWEMwg/goETnINI54c4X2rEs4LTlN6JdPK2i14HKEFj5dr62GFapFxcKbZmOSufh1T0AIRKl/oQIuwKdkGFOuumjZJeHsWm/It3p90WILupI8FjTIHQOncX9rYY/smMijUXORaK59m9oAVTfFnCucU= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: notification of front process change
by Eric Schlegel 14 Feb '06

14 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Feb 14, 2006, at 2:24 PM, Braden Thomas wrote: -eric _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… It's easy to get the frontmost application using the Carbon API GetFrontProcess. What the recommended way for my application to get a notification when this front process is changed, without having to constantly check the value returned by GetFrontProcess? If your app can link against Carbon.framework, we recommend the kEventAppFrontSwitched Carbon event. This email sent to site_archiver(a)lists.apple.com

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notification of front process change
by Braden Thomas 14 Feb '06

14 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thanks for any tips, Braden _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… It's easy to get the frontmost application using the Carbon API GetFrontProcess. What the recommended way for my application to get a notification when this front process is changed, without having to constantly check the value returned by GetFrontProcess? This email sent to site_archiver(a)lists.apple.com

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Re: Crash report
by Brian Bechtel 14 Feb '06

14 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=mu4hcyzcRCsubnPqh4Gj1YE1JRQd0Z1eZBfocgIPmcdhG0RP7rQpRPxCz7kEEEBABhsoz6oARAVQF0t6npzWUIZXSl4Sh4SbgJwz1pvRAFpfA2YgJzhhsTAjMnhX1t37N/i8nDcHxIc8dh09e+TBnWJ+SLjO4A7vIJWb5ZDBsX8= On 2/14/06, Philippe Devallois <phdevallois(a)intego.com> wrote: > Hello All, > > Nobody's perfect, I just received my first crash log from a Coreduo > user. > > Is it a big challenge to dump some bytes around the EBP register to > the report? <http://bugreporter.apple.com> _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Crash report
by Philippe Devallois 14 Feb '06

14 Feb '06

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hello All, Thanks in advance, -- Philippe Sorrow: an emotion of great sadness associated with loss or bereavement _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Nobody's perfect, I just received my first crash log from a Coreduo user. Is it a big challenge to dump some bytes around the EBP register to the report? In the regretted nice powerpc world, we had a small context kept in the registers (r3->rx) helping us to guess the crashing function parameter values. With the i386 ABI all values are pushed into the stack due to the LACK of registers ;-) This email sent to site_archiver(a)lists.apple.com

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