September 2004 - Darwin-kernel

Re: Help with _MALLOC
by Peter Lovell 29 Sep '04

29 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 27, 2004, at 12:55 PM, Matt Jaffa wrote: No, but I should do that I am guessing right? When is it smart to do M_NOWAIT? Matt On Sep 27, 2004, at 10:31 AM, stephane sudre wrote: On Sep 27, 2004, at 6:28 PM, Matt Jaffa wrote: Hi, Cheers.....Peter _______________________________________________ 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 have been core dumping my panics to a remote machine and been using gdb to figure out where in my NKE it keeps crashing, and it appears to be randomly crashing at different parts. maybe due to the fact I call _MALLOC and get space but it never allocated it. because I have a structure pointer that I allocate and store things in there, but it is crashing at this line: one->thedata = data; To me one must not be allocated so it crashes, how do I ensure that calling _MALLOC is going to give me space and not crash my NKE??? Are you using M_WAITOK? M_NOWAIT is good if you don't want to block. You'll retry somehow on your own, or abandon the attempt, or ... M_WAITOK means that you want to wait until the request can be fulfilled. That may take a while. This email sent to site_archiver(a)lists.apple.com

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Re: Help with _MALLOC
by Justin Walker 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 27, 2004, at 9:28, Matt Jaffa wrote: Hi, Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | Men are from Earth. | Women are from Earth. | Deal with it. *--------------------------------------*-------------------------------* _______________________________________________ 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 have been core dumping my panics to a remote machine and been using gdb to figure out where in my NKE it keeps crashing, and it appears to be randomly crashing at different parts. maybe due to the fact I call _MALLOC and get space but it never allocated it. because I have a structure pointer that I allocate and store things in there, but it is crashing at this line: one->thedata = data; To me one must not be allocated so it crashes, how do I ensure that calling _MALLOC is going to give me space and not crash my NKE??? In all likelihood, it is not _MALLOC that is crashing your NKE. If you call _MALLOC and it returns with an allocation, then you have the space. Are you sure that you get the space you requested? Are you checking for errors? Are you using the correct arguments? The last code snippet you posted, as I recall, had bad arguments in the call. This email sent to site_archiver(a)lists.apple.com

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Re: Help with _MALLOC
by Peter Lovell 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 27, 2004, at 12:28 PM, Matt Jaffa wrote: You can't. It's just ornery sometimes, and you have to deal with it. Regards.....Peter _______________________________________________ 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.… how do I ensure that calling _MALLOC is going to give me space Pressing on regardless is one option but is not generally helpful. Wait and retry is usually better. Or you could decide, depending on what's being done, just to scrap this request. That would be appropriate if you're dealing with lossy transmission, for example. This email sent to site_archiver(a)lists.apple.com

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Re: Help with _MALLOC
by Matt Jaffa 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com No, but I should do that I am guessing right? When is it smart to do M_NOWAIT? Matt On Sep 27, 2004, at 10:31 AM, stephane sudre wrote: On Sep 27, 2004, at 6:28 PM, Matt Jaffa wrote: Hi, Are you using M_WAITOK? _______________________________________________ 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 have been core dumping my panics to a remote machine and been using gdb to figure out where in my NKE it keeps crashing, and it appears to be randomly crashing at different parts. maybe due to the fact I call _MALLOC and get space but it never allocated it. because I have a structure pointer that I allocate and store things in there, but it is crashing at this line: one->thedata = data; To me one must not be allocated so it crashes, how do I ensure that calling _MALLOC is going to give me space and not crash my NKE??? This email sent to site_archiver(a)lists.apple.com

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Re: Help with _MALLOC
by stephane sudre 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 27, 2004, at 6:28 PM, Matt Jaffa wrote: Hi, Are you using M_WAITOK? _______________________________________________ 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 have been core dumping my panics to a remote machine and been using gdb to figure out where in my NKE it keeps crashing, and it appears to be randomly crashing at different parts. maybe due to the fact I call _MALLOC and get space but it never allocated it. because I have a structure pointer that I allocate and store things in there, but it is crashing at this line: one->thedata = data; To me one must not be allocated so it crashes, how do I ensure that calling _MALLOC is going to give me space and not crash my NKE??? This email sent to site_archiver(a)lists.apple.com

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Help with _MALLOC
by Matt Jaffa 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, 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 have been core dumping my panics to a remote machine and been using gdb to figure out where in my NKE it keeps crashing, and it appears to be randomly crashing at different parts. maybe due to the fact I call _MALLOC and get space but it never allocated it. because I have a structure pointer that I allocate and store things in there, but it is crashing at this line: one->thedata = data; To me one must not be allocated so it crashes, how do I ensure that calling _MALLOC is going to give me space and not crash my NKE??? This email sent to site_archiver(a)lists.apple.com

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[solved] Re: Further debugging kernel panics.
by Matt Jaffa 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Ok, I got my symbols showing up now. Matt On Sep 27, 2004, at 5:59 AM, Peter Lovell wrote: Regards.....Peter On Sep 27, 2004, at 1:52 AM, Matt Jaffa wrote: Well I think I know what it is, but can't get the symbols to load. _______________________________________________ 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.… Get hold of the debug version of the kernel from ADC site. It has symbols in it and should help. Just make sure to get the version which matches the rest of the system you're running. When I load my kext, and do kextstat, the addresses begin there, so that is must be where it is crashing within my NKE, but I try to load my kext's symbol file generated by kextload -s, and do backtrace(bt) and still it shows the ??, This email sent to site_archiver(a)lists.apple.com

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Re: Further debugging kernel panics.
by Matt Jaffa 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Matt On Sep 27, 2004, at 5:59 AM, Peter Lovell wrote: Regards.....Peter On Sep 27, 2004, at 1:52 AM, Matt Jaffa wrote: Well I think I know what it is, but can't get the symbols to load. _______________________________________________ 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 was able to do that, so in the backtrace I can see where it is going through the kernel, but there are still some symbols undefined and I believe it is my NKE symbols, but I did add-symbol-file to my symbol file and it still isn't showing anything. Get hold of the debug version of the kernel from ADC site. It has symbols in it and should help. Just make sure to get the version which matches the rest of the system you're running. When I load my kext, and do kextstat, the addresses begin there, so that is must be where it is crashing within my NKE, but I try to load my kext's symbol file generated by kextload -s, and do backtrace(bt) and still it shows the ??, This email sent to site_archiver(a)lists.apple.com

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Re: Further debugging kernel panics.
by Peter Lovell 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Regards.....Peter On Sep 27, 2004, at 1:52 AM, Matt Jaffa wrote: Well I think I know what it is, but can't get the symbols to load. _______________________________________________ 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.… Get hold of the debug version of the kernel from ADC site. It has symbols in it and should help. Just make sure to get the version which matches the rest of the system you're running. When I load my kext, and do kextstat, the addresses begin there, so that is must be where it is crashing within my NKE, but I try to load my kext's symbol file generated by kextload -s, and do backtrace(bt) and still it shows the ??, This email sent to site_archiver(a)lists.apple.com

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Re: Further debugging kernel panics.
by Pekka Nikander 27 Sep '04

27 Sep '04

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Well I think I know what it is, but can't get the symbols to load. I had problems of debugging symbols being removed from my kexts. It appeared that I needed to do two things to fix it: - change some project property in Xcode (don't remember any more which one, as I have moved away from Xcode to use plain old Makefiles) - not to use Xcode to "install" the kext in /tmp, but copy it verbatim. For some reason I couldn't make Xcode install target not to strip the kext. Finally, it was necessary for me to copy back the symbol table, as generated with kextload -s, from the target machine back go the machine running gdb, and make sure that I was loading the right kernel to gdb. (I was running a debug kernel on the target machine, and regular kernel on the one where I run gdb.) --Pekka _______________________________________________ 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.… When I load my kext, and do kextstat, the addresses begin there, so that is must be where it is crashing within my NKE, but I try to load my kext's symbol file generated by kextload -s, and do backtrace(bt) and still it shows the ??, This email sent to site_archiver(a)lists.apple.com

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