February 2010 - Darwin-kernel

Re: Kernel Panic Error Code 9
by William Kucharski 18 Feb '10

18 Feb '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.1.7) Gecko/20100115 Lightning/1.0b1 Thunderbird/3.0.1 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'm deciphering a few kernel panics. What is Error Code 0x00000009? Some of the crashes indicate 0x00000000. This is reading from a non- present page (e.g. reading from 0). But what is error code 9? In this case the registers that were 0 in the error code 0 crash are all 0xffffffff. What kind of panic was it? Error codes mean different things depending on the exception type. <http://www.intel.com/Assets/PDF/manual/253668.pdf> William Kucharski _______________________________________________ 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 02/18/10 12:58, Duane Murphy wrote: Assuming it was an Intel Mac, see chapter 6 of "Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 3A: System Programming Guide, Part 1": This email sent to site_archiver(a)lists.apple.com

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Re: Kernel Panic Error Code 9
by Ryan Hankins 18 Feb '10

18 Feb '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 2.0.0.23 (Macintosh/20090812) Hard to know without context, but perhaps #define EBADF 9 /* Bad file descriptor */ in errno.h -Ryan -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'm deciphering a few kernel panics. What is Error Code 0x00000009? Thanks, ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBS32b3krg9acQ4r2CAQha4Af9GzUdYwb1xs35Og+suC+yr5mzPCK9y9IZ UtM9b1OYQ9+9inh0s+1xExjmN5JK0/cPKpzlkJq0IEiameEbZF09o2zzYQluC5Fm Y9lOwsc2jmnTGSs88y6eEVZAupvdA2H+BwyPAdxefov5Rva+GYnbMC8KgO2e/47G OOhzX4dM4gRhLQtC23pNb0lMgVoamCdoe1aU7nuOBtunEbW02fKjQA39OR6x8dUa 9us/+RO5TqPbesvhuz79fO2DS8uANJ/LVkyAcONIYihl0+/Jg94iI3qGtq/F29+C wVzwcBptc2jHSqBKNhpM+uwWngyODFgiexIY8UcrYfIQGGsqbTP8Zg== =Nd5y -----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/rqh%40small-tree.com This email sent to rqh(a)small-tree.com -- Ryan Hankins Software Engineer Small Tree Communications www.small-tree.com rqh(a)small-tree.com +1 651 209-6509 x303 _______________________________________________ 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.… Some of the crashes indicate 0x00000000. This is reading from a non- present page (e.g. reading from 0). But what is error code 9? In this case the registers that were 0 in the error code 0 crash are all 0xffffffff. This email sent to site_archiver(a)lists.apple.com

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Kernel Panic Error Code 9
by Duane Murphy 18 Feb '10

18 Feb '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I'm deciphering a few kernel panics. What is Error Code 0x00000009? Some of the crashes indicate 0x00000000. This is reading from a non- present page (e.g. reading from 0). But what is error code 9? In this case the registers that were 0 in the error code 0 crash are all 0xffffffff. Thanks, ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBS32b3krg9acQ4r2CAQha4Af9GzUdYwb1xs35Og+suC+yr5mzPCK9y9IZ UtM9b1OYQ9+9inh0s+1xExjmN5JK0/cPKpzlkJq0IEiameEbZF09o2zzYQluC5Fm Y9lOwsc2jmnTGSs88y6eEVZAupvdA2H+BwyPAdxefov5Rva+GYnbMC8KgO2e/47G OOhzX4dM4gRhLQtC23pNb0lMgVoamCdoe1aU7nuOBtunEbW02fKjQA39OR6x8dUa 9us/+RO5TqPbesvhuz79fO2DS8uANJ/LVkyAcONIYihl0+/Jg94iI3qGtq/F29+C wVzwcBptc2jHSqBKNhpM+uwWngyODFgiexIY8UcrYfIQGGsqbTP8Zg== =Nd5y -----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: Propagating Read-Only?
by Kevin Elliott 12 Feb '10

12 Feb '10

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Re: Propagating Read-Only?
by Michael Smith 12 Feb '10

12 Feb '10

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Re: Propagating Read-Only?
by Duane Murphy 12 Feb '10

12 Feb '10

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Re: Propagating Read-Only?
by Michael Smith 12 Feb '10

12 Feb '10

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Re: Propagating Read-Only?
by Duane Murphy 12 Feb '10

12 Feb '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Thank you Kevin. That's the route that I have been trying to go down. However, I'm not working out the unmount incantation. This is especially difficult with a USB disk. I seems that I need to get all of the IOMedia to be recreated after changing to the state. Thoughts on how that can be accomplished? Thanks again! ...Duane On Feb 11, 2010, at 4:00 PM, Kevin Elliott wrote: > You should not be changing this state while the media is mounted. > Doing so has unpredictable consequences, varying between "bizarre" > and "catastrophic". A read/write filesystem expects to be able to > write data to it's target, so changing that value unpredictably will > corrupt the file system as it's metadata writes fail to complete. > > On the other hand, if you only change the state when the volume is > unmounted (unmount, make read only, remount, etc..) my experience > has been that very thing will work as expected. > > -Kevin > > > On Feb 11, 2010, at 2:54 PM, Duane Murphy wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA256 >> >> We have a block storage driver kext that can we would like to be able >> to change from read-write to read-only dynamically. >> >> I've worked out how to change the driver to read-only and the >> underlying IOMedia object. But the read-only change doesn't propagate >> any further to the file system IOMedia objects or the file system. >> >> If the underlying media is changed to read-only then an error is >> returned by the file system. However, if the media is then changed >> back to read-write, the file system continues to display an error. >> I'm >> fine with the error, the problem in this case is getting the file >> system to try again so that it is successful. >> >> How can I go about updating the file system so that it is aware that >> the media has changed to read-only and then later back to read-write? >> >> Thanks for any tips, >> >> ...Duane >> >> >> >> >> -----BEGIN PGP SIGNATURE----- >> Version: PGP Desktop 9.10.0 (Build 500) >> Charset: US-ASCII >> >> wsBVAwUBS3SKo0rg9acQ4r2CAQj5DwgA9zRRyL5bb8B2HkBs0bH0BhJwzc3LUukj >> sWMKIkM2ZMw80gED7ZT1ZPckxVReSDAaEKfe3usM8G3R1KMmq+CQansvm6y6J5lu >> R6r4sDb66POoR2l3xgQ8+iwo/Wl/oCCr/kNQC2DcgmQnD3X41+im3P0YV/NTafZB >> loaitvKGu95nXzVs8eEAkV0oz36Cxi0DhiPWBAzcA/A67sWot0NvaSo3Q0xec49M >> ztfJamVtNhOYrT2FknHXxUWKoiEDJcg+RNbdoRQa3W/JuOeiEL/X2mL1BA4ZuFYE >> SsNqk5aJixcVtcZ1w7KSGfR69oAu6vzOlrRErfxKrHUUaax9mcdc2g== >> =g48r >> -----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/kelliott%40mac.com >> >> This email sent to kelliott(a)mac.com > ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBS3Skn0rg9acQ4r2CAQjQcwgAoFVm4q/0AnveLBcUczRoEdtMRUTC6oic OC5FEsphFL5SY3bhsqbFEEbTZ9g9HlqYg9Yh4nWBWx+/tdCaI7P5vGPIvdgmz/hD ilDkn6/L2xdKAjDeaTH8trnj0D2uboab1GEzaXJ6u2r1N/VY4/8N2qSKsmcnh3q9 2CN3iMP9YPrvJTgBbHgX8+ggRkaIowCe3sc6JAIugrettYl5QF4x14894XqADM3g nLnLtG+DWkyEZ+CM+I02SnBsaG7vSwj2ecxfHHJR5la6vlVck4+nf+tZvyMDCkYV 3M8PHAo5hotBmKnYM+YbaCpI2inPHOKIeH7X61LXUUAqUYMbTbTpLg== =5yrG -----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: Propagating Read-Only?
by Kevin Elliott 12 Feb '10

12 Feb '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com You should not be changing this state while the media is mounted. Doing so has unpredictable consequences, varying between "bizarre" and "catastrophic". A read/write filesystem expects to be able to write data to it's target, so changing that value unpredictably will corrupt the file system as it's metadata writes fail to complete. On the other hand, if you only change the state when the volume is unmounted (unmount, make read only, remount, etc..) my experience has been that very thing will work as expected. -Kevin On Feb 11, 2010, at 2:54 PM, Duane Murphy wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > We have a block storage driver kext that can we would like to be able > to change from read-write to read-only dynamically. > > I've worked out how to change the driver to read-only and the > underlying IOMedia object. But the read-only change doesn't propagate > any further to the file system IOMedia objects or the file system. > > If the underlying media is changed to read-only then an error is > returned by the file system. However, if the media is then changed > back to read-write, the file system continues to display an error. I'm > fine with the error, the problem in this case is getting the file > system to try again so that it is successful. > > How can I go about updating the file system so that it is aware that > the media has changed to read-only and then later back to read-write? > > Thanks for any tips, > > ...Duane > > > > > -----BEGIN PGP SIGNATURE----- > Version: PGP Desktop 9.10.0 (Build 500) > Charset: US-ASCII > > wsBVAwUBS3SKo0rg9acQ4r2CAQj5DwgA9zRRyL5bb8B2HkBs0bH0BhJwzc3LUukj > sWMKIkM2ZMw80gED7ZT1ZPckxVReSDAaEKfe3usM8G3R1KMmq+CQansvm6y6J5lu > R6r4sDb66POoR2l3xgQ8+iwo/Wl/oCCr/kNQC2DcgmQnD3X41+im3P0YV/NTafZB > loaitvKGu95nXzVs8eEAkV0oz36Cxi0DhiPWBAzcA/A67sWot0NvaSo3Q0xec49M > ztfJamVtNhOYrT2FknHXxUWKoiEDJcg+RNbdoRQa3W/JuOeiEL/X2mL1BA4ZuFYE > SsNqk5aJixcVtcZ1w7KSGfR69oAu6vzOlrRErfxKrHUUaax9mcdc2g== > =g48r > -----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/kelliott%40mac.com > > This email sent to kelliott(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/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Propagating Read-Only?
by Duane Murphy 11 Feb '10

11 Feb '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 We have a block storage driver kext that can we would like to be able to change from read-write to read-only dynamically. I've worked out how to change the driver to read-only and the underlying IOMedia object. But the read-only change doesn't propagate any further to the file system IOMedia objects or the file system. If the underlying media is changed to read-only then an error is returned by the file system. However, if the media is then changed back to read-write, the file system continues to display an error. I'm fine with the error, the problem in this case is getting the file system to try again so that it is successful. How can I go about updating the file system so that it is aware that the media has changed to read-only and then later back to read-write? Thanks for any tips, ...Duane -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 9.10.0 (Build 500) Charset: US-ASCII wsBVAwUBS3SKo0rg9acQ4r2CAQj5DwgA9zRRyL5bb8B2HkBs0bH0BhJwzc3LUukj sWMKIkM2ZMw80gED7ZT1ZPckxVReSDAaEKfe3usM8G3R1KMmq+CQansvm6y6J5lu R6r4sDb66POoR2l3xgQ8+iwo/Wl/oCCr/kNQC2DcgmQnD3X41+im3P0YV/NTafZB loaitvKGu95nXzVs8eEAkV0oz36Cxi0DhiPWBAzcA/A67sWot0NvaSo3Q0xec49M ztfJamVtNhOYrT2FknHXxUWKoiEDJcg+RNbdoRQa3W/JuOeiEL/X2mL1BA4ZuFYE SsNqk5aJixcVtcZ1w7KSGfR69oAu6vzOlrRErfxKrHUUaax9mcdc2g== =g48r -----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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