September 2007 - Darwin-kernel

Re: May I post a Leopard kernel panic question here?
by Terry Lambert 18 Sep '07

18 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Sorry, but DTS is the best bet. -- Terry Hi Chris, why don't you send directly a private e-mail to Terry or Mike or the both ? -mm w On Sep 17, 2007, at 2:33 PM, Shawn Erickson wrote: I am getting a kernel panic and I wonder if it is okay to post the kernel panic log output here for a possible answer. _______________________________________________ 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/openspecies%40gmail.com This email sent to openspecies(a)gmail.com -- echo zapydapntpd.rxltw@nzx | tr a-z@. p-za-o.@ _______________________________________________ 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/tlambert%40apple.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'm sure I'm not saying anything that isn't common knowledge to most of the people here, but it occasionally needs said... Neither Mike nor I have the ability to verify access to seed builds, or authenticate NDAs, which means we can't talk to anyone about unreleased product outside channels without authorization. If, however, it shows up in a bug report, and that bug report gets handed off to one of us, then we can jump in on that side of things, since that means there's DTS authentication. It also means you are more likely to get a fix, because we can point to a documented customer issue to justify spending the time working on the problem to our management, and have a place to hang the fix so that it will make it through the process into a customer build. If you can reproduce the problem in a shipped version of the OS (e.g. a Tiger release), then we could just pull out the decoder rings and look for you. Often, though, the stack traceback won't be enough for a panic fix, if there is a KEXT involved. In those cases, we like to get a core dump attached to a bug report so we can poke around and see what's going on; it's not as good as two machine debugging, but it lets us better track down side effects of side effects. That's the other reason for going through the normal bug reporting process. The best bug report is one with a reproducible test case, rather than a frozen core; that way if we have to go to hardware level debugging (JTAG, etc.), then we can. That's something that would be necessary for, for example, an issue in the pmap layer on a 64 bit machine, where not all of the structures are visible from virtual rather than physical memory addressing (which could also leave them missing from a kernel core image). The absolute best bug report, of course, has a patch attached to it. 8-). On Sep 18, 2007, at 7:41 AM, mm w wrote: On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: Shawn, I have submitted a bug report to Apple. What I wanted to know is if it is permissible to show the summary for the kernel panic and see if someone can tell me if it is an easy pointer to a fix like I missed something or not. Thanks, Chris On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: Review the release notes for the Leopard preview to understand how to submit an issue like this. -Shawn This email sent to tlambert(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: May I post a Leopard kernel panic question here?
by mm w 18 Sep '07

18 Sep '07

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=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=uZpwROW6CIRttij6oaMf+KSdF1nz4W6+r+vOhNBblpE=; b=VpoPLGuZ7nx1lpCZ06ukwJXWdL+MWGSlcZmvL7h0Ry09YtsXP+xc3Uuxhwb/RY4TairIwAMpKWJgoW+Xi1Rz9Kkt7SgD+TFdHqJgXoPpGOlVmgAjLU0fV0km1wvSvIeKtWUUdNXr5pOqaS8j+KsIMKSyMCSYhiczreyDLMzwJxE= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=J8mmnqFZ1WvYijeI5iWKy/ybT3qPerWsOU9bYqyf8F+pjkY015QUFhTaDKmQb3DyXnEhc4h/ZIlWvXuL4LEqvqVvANJSs4mZQjUwmtru0KzcMo09XMPBYDKLbGVnpYeZ/KjoklzqWArtSu7PG9wAywazm4KRioN9dp+H2y2F5Bo= Hi Chris, why don't you send directly a private e-mail to Terry or Mike or the both ? -mm w On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: > Shawn, > I have submitted a bug report to Apple. What I wanted to know is if > it is permissible to show the summary for the kernel panic and see > if someone can tell me if it is an easy pointer to a fix like I > missed something or not. > Thanks, > Chris > > On Sep 17, 2007, at 2:33 PM, Shawn Erickson wrote: > > > On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: > >> I am getting a kernel panic and I wonder if it is okay to post the > >> kernel panic log output here for a possible answer. > > > > Review the release notes for the Leopard preview to understand how to > > submit an issue like this. > > > > -Shawn > > _______________________________________________ > 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/openspecies%40gmail.com > > This email sent to openspecies(a)gmail.com > -- echo zapydapntpd.rxltw@nzx | tr a-z@. p-za-o.@ _______________________________________________ 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: Virtual serial ports
by Thomas Hauk 18 Sep '07

18 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Configure both pty line disciplines to disable local echo? To do so, clear ECHO in c_lflag before calling tcsetattr(3)... Thanks for the response! I tried it -- good guess, but still no luck. T _______________________________________________ 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.… On Sep 17, 2007, at 9:34 PM, Régis Duchesne wrote: Another interesting tidbit: I test by using one of the two clients (running a little sandbox in xterm) to send "a" followed by hitting return, and it sends 2 bytes (0x61 0xa, which is 'a' followed by a newline, so that's fine). But when my app reads this from the master file descriptor, it reads 3 bytes -- 0x61 0xa 0xa. Based on that observation and your hint, I also tried clearing the ECHONL flag in my app, but that didn't change anything. I will continue looking at the rest of these flags, but if there's any more ideas out there, feel free to reply. -- Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems. --Jamie Zawinski, in comp.lang.emacs This email sent to site_archiver(a)lists.apple.com

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Re: Virtual serial ports
by Régis Duchesne 18 Sep '07

18 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Icedove 1.5.0.9 (X11/20061220) Thomas, > which means that every time I read from masterA and write to > masterB, masterB is then flagged as having input to be read... which > means I get an infinite loop of data being copied back and forth. This > happens every loop, no matter the delay between iterations (I'm running > it inside Xcode). I am hoping this can be prevented, as there is no way > to tell the difference between the master being ready to read because of > input from the a client writing to the slave pty, or from app writing to > that master file descriptor. > > I have to assume that I'm missing some small detail. Pouring through > Stevens' Advanced Programming in the UNIX Environment has not yet > revealed any answers. Any ideas out there? Configure both pty line disciplines to disable local echo? To do so, clear ECHO in c_lflag before calling tcsetattr(3)... -- hpreg _______________________________________________ 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: Virtual serial ports
by Thomas Hauk 18 Sep '07

18 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com T _______________________________________________ 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.… On Sep 11, 2007, at 4:35 PM, Terry Lambert wrote: If they should both think they are talking to serial ports, then you can write a little program that opens the master side of two ptys, calls grantpt() on both and unlockpt() on both, uses fcntl() to put them in non-blocking mode, then calls select() on both, and when they become active, writes the data from one end to the other and vice versa. I've written a little app that does this, mostly... openpty(3) handles most of the getpt/grantpt/unlockpt/etc stuff... at least I think. :) I've scanned through implementations of openpty on Google Code Search and it looks like it, at least. My app calls openpty twice, and has a loop with select that reads from one master and writes the data read to the other master. My understanding was that if you write to a ptm, it actually goes to the input of the pts... and writing to the pts is input for the ptm. The good news is that the clients who just open up the slave ptys correctly get their input read, and they receive data from my app. There's one small problem... what is also happening *inside* my app is that if I write to my master file descriptor it also becomes input for the other... which means that every time I read from masterA and write to masterB, masterB is then flagged as having input to be read... which means I get an infinite loop of data being copied back and forth. This happens every loop, no matter the delay between iterations (I'm running it inside Xcode). I am hoping this can be prevented, as there is no way to tell the difference between the master being ready to read because of input from the a client writing to the slave pty, or from app writing to that master file descriptor. I have to assume that I'm missing some small detail. Pouring through Stevens' Advanced Programming in the UNIX Environment has not yet revealed any answers. Any ideas out there? -- Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems. --Jamie Zawinski, in comp.lang.emacs This email sent to site_archiver(a)lists.apple.com

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Re: May I post a Leopard kernel panic question here?
by Alexander v. Below 17 Sep '07

17 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com My suggestion is this: If you can reproduce the issue in 10.4, post that panic log. Alex On 17.09.2007, at 23:39, driggett(a)mac.com wrote: On Sep 17, 2007, at 2:33 PM, Shawn Erickson wrote: I am getting a kernel panic and I wonder if it is okay to post the kernel panic log output here for a possible answer. Review the release notes for the Leopard preview to understand how to submit an issue like this. _______________________________________________ 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/below%40mac.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.… If you can not reproduce the issue in 10.4, then it is likely that discussing it will violate the NDA Shawn, I have submitted a bug report to Apple. What I wanted to know is if it is permissible to show the summary for the kernel panic and see if someone can tell me if it is an easy pointer to a fix like I missed something or not. Thanks, Chris On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: -Shawn This email sent to below(a)mac.com This email sent to site_archiver(a)lists.apple.com

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Re: May I post a Leopard kernel panic question here?
by driggett＠mac.com 17 Sep '07

17 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Sep 17, 2007, at 2:33 PM, Shawn Erickson wrote: I am getting a kernel panic and I wonder if it is okay to post the kernel panic log output here for a possible answer. Review the release notes for the Leopard preview to understand how to submit an issue like this. _______________________________________________ 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.… Shawn, I have submitted a bug report to Apple. What I wanted to know is if it is permissible to show the summary for the kernel panic and see if someone can tell me if it is an easy pointer to a fix like I missed something or not. Thanks, Chris On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: -Shawn This email sent to site_archiver(a)lists.apple.com

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Re: May I post a Leopard kernel panic question here?
by Shawn Erickson 17 Sep '07

17 Sep '07

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=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=s5FM0IF77e00HRTLUPmrD3yuY4qQj11hf8qu0qvGumM=; b=TMsEiKnfG1UonrkLUeopPvPzXtToasVZPHRTyaVjG48LwWnHHL8Q8PJTh3yEUiVCGKymLpjMBdr3s17H5UoAoXYF6kDGmESmL9jkqprdBmolPNgFV1yFAmmJkyfE08rkTP+nJfL6pIC0LqoBzAOO9T5GXm24Ic7qQjfA+mYqst8= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=qENw0w2IPFMPQ38xtPx9L8kM6ktLiurF6ecJIivHmw5hNX+kAbztfLFUeR0NPrHEThNB88+eFY4sSVlVXFlRZEz3TM9XjwUpyTvPnHqEenzCZqSscav4cgEBtQxW/i5KDqD6t9IpjJ7ssP/tSRjn2Pk5growwgolVUeioeEiaaM= On 9/17/07, driggett(a)mac.com <driggett(a)mac.com> wrote: > I am getting a kernel panic and I wonder if it is okay to post the > kernel panic log output here for a possible answer. Review the release notes for the Leopard preview to understand how to submit an issue like this. -Shawn _______________________________________________ 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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May I post a Leopard kernel panic question here?
by driggett＠mac.com 17 Sep '07

17 Sep '07

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.… I am getting a kernel panic and I wonder if it is okay to post the kernel panic log output here for a possible answer. Thanks, Chris Driggett This email sent to site_archiver(a)lists.apple.com

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Re: File I/O from within a Filesystem Driver
by Terry Lambert 14 Sep '07

14 Sep '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com You will need to do the I/O from user space. -- Terry _______________________________________________ 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.… On Sep 13, 2007, at 5:12 PM, Ron Aldrich wrote: I'm currently adding Multi-session writing to our UDF filesystem driver, and need to be able to read and write temporary files on the root drive while processing I/Os to the UDF volume. My UDF filesystem currently resides entirely in Kernel space, so I'm wondering what kinds of problems I can expect to encounter when accessing those temporary files, and whether or not I will need to perform those I/Os in user space. This email sent to site_archiver(a)lists.apple.com

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