August 2011 - Darwin-kernel

Spurious warnings from sips (scriptable image processing system)
by Jerry Krinock 31 Aug '11

31 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Since updating to OS X Lion, I get two silly warnings whenever I invoke sips to reduce the height or width of a png file. Like this: MacMini2:~ jk$ sips –resampleWidth 200 /path/to/old/Whatever.png –out /path/to/new/Whatever.png /path/to/old/Whatever.png [ (kCGColorSpaceDeviceRGB)] ( 0 0 0 1 ) libpng warning: zero length keyword libpng warning: Empty language field in iTXt chunk /path/to/new/Whatever.png It still seems to work fine, though. Possibly Lion is using a newer version of libpng, and sips needs to be updated. Has anyone else noticed this? Is there a better email list to discuss this issue? Where should I report this bug? Thanks, Jerry Krinock _______________________________________________ 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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kextload loads old version of kext
by Antoine Missout 27 Aug '11

27 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, Basically, I'm doing this: - version A of a kext is inside /System/Library/Extensions - it is unloaded using kextunload - the mach-o file inside Contents/MacOS is modified and is now version B - /System/Library/Extensions is touched - kext is reloaded using kextload However, sometimes, version A is reloaded instead of version B, even though it doesn't exist anymore. What is happening (delay in kextd?) and how can I avoid it ? Thanks, Antoine _______________________________________________ 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: gdb error: Premature end of file reading symbol table
by mogambo 27 Aug '11

27 Aug '11

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=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=gqo98LlM4C+2GOnxg2pE/iz69Ml5/FvfeFfxJqOPy8A=; b=LwwIn0Dc6O2FloGO4Y8oH/KassUzIR5g7EZHbn9/pYxs1MnZ0aFNDb/5BG5XIrqaFF Z+fdHQzZ+Bvb1lXQiuJRoi6uyuNMbZcYfCaPOMCDD8BDOBr3VzQ1NV40KpPRlvEEM9Kx 0/ZPy/lg1YiGdoCHGS/WRbI9/h7J5rZiX9CsM= Thanks, Brian. I tried what you suggested, but it still does not work. I generated the symbols in the same directory as the kext while loading kext (did not need to use -n). I get the same error. -s. On Tue, Aug 23, 2011 at 8:03 AM, Brian Bechtel <brian.bechtel(a)gmail.com> wrote: > On Mon, Aug 22, 2011 at 6:31 PM, mogambo <mogambo13(a)gmail.com> wrote: >> This is preventing me from making any progress on debugging the kernel >> panic further. I am trying to provide more information that seems >> relevant to me. >> >> MacProQA9:~ apple$ sw_vers >> ProductName: Mac OS X >> ProductVersion: 10.7 >> BuildVersion: 11A494a >> MacProQA9:~ apple$ uname -a >> Darwin MacProQA9.local 11.0.0 Darwin Kernel Version 11.0.0: Mon Jun 13 >> 11:33:28 PDT 2011; root:xnu-1699.22.70~3/RELEASE_X86_64 x86_64 >> >> $ hdiutil attach >> ~/Downloads/kernel_debug_kit_mac_os_x_lion_developer_preview_4_update_1_11a494a.dmg >> /dev/disk2 Apple_partition_scheme >> /dev/disk2s1 Apple_partition_map >> /dev/disk2s2 Apple_HFS /Volumes/KernelDebugKit >> >> $ gdb -arch x86_64 /Volumes/KernelDebugKit/mach_kernel >> GNU gdb 6.3.50-20050815 (Apple version gdb-1704) (Thu Jun 23 10:48:29 UTC 2011) >> Copyright 2004 Free Software Foundation, Inc. >> GDB is free software, covered by the GNU General Public License, and you are >> welcome to change it and/or distribute copies of it under certain conditions. >> Type "show copying" to see the conditions. >> There is absolutely no warranty for GDB. Type "show warranty" for details. >> This GDB was configured as "x86_64-apple-darwin"... >> (gdb) add-symbol-file com.omneon.kext.omfs.sym > > What if you try "add-kext" instead of "add-symbol-file"? Specify the > path to the kext, i.e. > > (gdb) add-kext ~/fsd/omfs.kext > >> sudo kextutil -arch x86_64 -s ~/fsd/symdir ~/fsd/omfs.kext > > ...but before you do that, build the symbols into the same directory > as your kext, e.g. > > sudo kextutil -n -arch x86_64 -s ~/fsd/ ~/fsd/omfs.kext > > -n don't load the kext, just generate symbols > > There were changes in both SnowLeopard and Lion to help search for > kexts and their symbols (see a previous post by Jason Molenda in this > mailing list) which perhaps means that putting your symbols in a > different directory than the kext itself is confusing someone. > > 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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Can IOFramebuffer(kext) do rectangle update?
by Dinoi(G) 25 Aug '11

25 Aug '11

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Using SSE registers in kernel code
by Arun 24 Aug '11

24 Aug '11

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Re: gdb error: Premature end of file reading symbol table
by Brian Bechtel 23 Aug '11

23 Aug '11

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=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=vkRiUOoPp0hW6winUFxcMC8y714KiwoPBrCTg5VNy8Q=; b=lnFXF8AZtyicOHDBv9Qh6onvTiMDyH24xclmFf6COmR2UM42Y4HDA+U6TaCc7GEmY7 pyG9FODo7s6Z8M11YqVtgEMOpTbCJy6VczsmWzsNkRPNZY10Hcjp9rZKffFDi5oc74/M rHPpyAW0CEDJB0wS2N22/R84j2QDPQiLRU16M= On Mon, Aug 22, 2011 at 6:31 PM, mogambo <mogambo13(a)gmail.com> wrote: > This is preventing me from making any progress on debugging the kernel > panic further. I am trying to provide more information that seems > relevant to me. > > MacProQA9:~ apple$ sw_vers > ProductName: Mac OS X > ProductVersion: 10.7 > BuildVersion: 11A494a > MacProQA9:~ apple$ uname -a > Darwin MacProQA9.local 11.0.0 Darwin Kernel Version 11.0.0: Mon Jun 13 > 11:33:28 PDT 2011; root:xnu-1699.22.70~3/RELEASE_X86_64 x86_64 > > $ hdiutil attach > ~/Downloads/kernel_debug_kit_mac_os_x_lion_developer_preview_4_update_1_11a494a.dmg > /dev/disk2 Apple_partition_scheme > /dev/disk2s1 Apple_partition_map > /dev/disk2s2 Apple_HFS /Volumes/KernelDebugKit > > $ gdb -arch x86_64 /Volumes/KernelDebugKit/mach_kernel > GNU gdb 6.3.50-20050815 (Apple version gdb-1704) (Thu Jun 23 10:48:29 UTC 2011) > Copyright 2004 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and you are > welcome to change it and/or distribute copies of it under certain conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for details. > This GDB was configured as "x86_64-apple-darwin"... > (gdb) add-symbol-file com.omneon.kext.omfs.sym What if you try "add-kext" instead of "add-symbol-file"? Specify the path to the kext, i.e. (gdb) add-kext ~/fsd/omfs.kext > sudo kextutil -arch x86_64 -s ~/fsd/symdir ~/fsd/omfs.kext ...but before you do that, build the symbols into the same directory as your kext, e.g. sudo kextutil -n -arch x86_64 -s ~/fsd/ ~/fsd/omfs.kext -n don't load the kext, just generate symbols There were changes in both SnowLeopard and Lion to help search for kexts and their symbols (see a previous post by Jason Molenda in this mailing list) which perhaps means that putting your symbols in a different directory than the kext itself is confusing someone. 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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Need help....
by rapuru.sriram＠wipro.com 23 Aug '11

23 Aug '11

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Re: gdb error: Premature end of file reading symbol table
by mogambo 23 Aug '11

23 Aug '11

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=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=BCJL87kBjnDk8RJGfIY2P3CV1UFty3VKVproOC1SBVI=; b=UZVfegSWeimlrNEA1jcvM3SC5nF5otooKtutAVd1LiRwjvVLNbew8DJTX+FcdV7N5i W43N25Cp29RFh66AKX4ATrPEyJAq74xmT3gw4Ft2tMfAGNkbzbsdXH9tO9TfdJvYDHMi zZWBTorSPDw5hRlcLSLdWFQX6IqhX+K6pAir0= This is preventing me from making any progress on debugging the kernel panic further. I am trying to provide more information that seems relevant to me. MacProQA9:~ apple$ sw_vers ProductName: Mac OS X ProductVersion: 10.7 BuildVersion: 11A494a MacProQA9:~ apple$ uname -a Darwin MacProQA9.local 11.0.0 Darwin Kernel Version 11.0.0: Mon Jun 13 11:33:28 PDT 2011; root:xnu-1699.22.70~3/RELEASE_X86_64 x86_64 $ hdiutil attach ~/Downloads/kernel_debug_kit_mac_os_x_lion_developer_preview_4_update_1_11a494a.dmg /dev/disk2 Apple_partition_scheme /dev/disk2s1 Apple_partition_map /dev/disk2s2 Apple_HFS /Volumes/KernelDebugKit $ gdb -arch x86_64 /Volumes/KernelDebugKit/mach_kernel GNU gdb 6.3.50-20050815 (Apple version gdb-1704) (Thu Jun 23 10:48:29 UTC 2011) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "x86_64-apple-darwin"... (gdb) add-symbol-file com.omneon.kext.omfs.sym add symbol table from file "com.omneon.kext.omfs.sym"? (y or n) y Reading symbols from <path>/com.omneon.kext.omfs.sym...Premature end of file reading symbol table (gdb) $ file com.omneon.kext.omfs.sym com.omneon.kext.omfs.sym: Mach-O 64-bit kext bundle x86_64 Brian, using -arch option in kextutil command line does not make a difference. I would highly appreciate some insight into this. -m. On Wed, Aug 17, 2011 at 4:02 PM, mogambo <mogambo13(a)gmail.com> wrote: > Hi, > > While on the subject of kext debugging with gdb on 10.7, I have a > related problem. When I try to debug a panic on 10.7, I see the error > when I try to load the symbol file. > > (gdb) add-symbol-file ~/fsd/symdir/com.omneon.kext.omfs.sym > add symbol table from file "~/fsd/symdir/com.omneon.kext.omfs.sym"? (y or n) y > Reading symbols from ~/fsd/symdir/com.omneon.kext.omfs.sym...Premature > end of file reading symbol table > > The symbol file is generated with the following command: > sudo kextutil -arch x86_64 -s ~/fsd/symdir ~/fsd/omfs.kext > > The backtrace can not show any frames from my kernel extension. > Anyone know about this? > > Thanks, > -m. > _______________________________________________ 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: cpu_number()
by Anatol Pomozov 20 Aug '11

20 Aug '11

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Re: cpu_number()
by Ken Hornstein 19 Aug '11

19 Aug '11

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com >> I know, I could take the hit and use a >> spinlock for those buffers, but depending on the configuration Lustre >> can log a lot of data and doing that could really hurt performance > >Instead of taking a spinlock, can you consider using atomic increment >(locked cmpxchg) to update the index into the buffer. This worked very well >for me in the past for similar requirements. Okay, I think I understand ... via OSAddAtomic() or similar function? Yeah, I got it ... that returns the original value, so you'd add the value of what you'd want to log to a buffer pointer via OSAddAtomic and store it at the offset returned by OSAddAtomic(). >The thread writing at the end of the buffer and wraping around may have to >do atomic increment twice depending on your implementation.You don't even >need to disable preemption(assuming that size of data written by all threads >simultaneously to this buffer is not greater than size of the buffer). Alright, I think I can see how to do it with wraparound safely. This code in Lustre that handles all of this is rather complicated, and it really deals with a collection of pages and handles them on a per-page basis, rather than dealing with a single buffer. I was just hoping to do the minimal amount of work possible to port this code, but at least if I write a new set of debugging routines it should be pretty isolated from the rest of Lustre. Admittedly the situation isn't ideal. Sigh. --Ken _______________________________________________ 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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