2.6.8 and cdrecord?

monkeyhead · Posted: Mon Aug 16, 2004 11:24 pm Post subject: 2.6.8 and cdrecord?

so i read about some people having problems with cdrecord and the 2.6.8 kernel because i could not for the life of me get cdrecord to work.

it kept reporting that my drive appeared to be a regular cd-rom and did not support burning.

so after searching gentoo forums, I rebooted to my 2.6.7-gentoo-r9 kernel and sure enough it worked without a hitch.

Anyone found any solutions to this yet? I was using 2.6.8-mm2-rc2 when i encountered the problem.

scmckenzie · Posted: Tue Aug 17, 2004 5:13 am Post subject:

don't know about solution yet .. have to burn discs as root

Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

From k3b.org news:

Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

Con has written an extremely simple patch to fix this problem (can;t beat his elegance and style in his patches compared to other brute force patches I could mention).

Anyway, here it is.

HTH

blaster999 · Posted: Tue Aug 17, 2004 7:09 pm Post subject:

Strange things are happening with the kernel. The second bug in 2.6.8 after the NFS. Shouldn't there be 2.6.8.2 soon?

PickledOnion, thanks for the link to the patch! I've discovered the bug when tried to clear a CD-RW today.

P.S. And big thanks to Con Kolivas! I am using ck-sources now.
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teutzz · Guru Joined: 22 Apr 2004 Posts: 333 Location: .ro

@PickledOnion: what would be the correct way to patch the kernel with this patch?
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Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

blaster999 · Posted: Wed Aug 18, 2004 7:59 am Post subject:

Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

Well, amazingly that is the basis of the so called 'security' problem. The fact that a user can record a cd is the whole security issue. The official answer is that you should be root to do that and only root should be able to record cds.

Now to me, and it is only my opinion, logging in as root to record cds is a far bigger security issue than a user recording cds. They say that anyone can come to your computer and record something but my argument would be that if that is the case then all, and I mean all, disk writing should be done as root. No user should be able to write or save or read something on a computer if using a cdr is a problem.

Obviously, my argument is not going to happen and would be ridiculous if it was even considered as realistic but that is the basis of the argument for the so called security issue.

Meh, at least we can record cds again

Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

teutzz · Guru Joined: 22 Apr 2004 Posts: 333 Location: .ro

10x
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teutzz · Guru Joined: 22 Apr 2004 Posts: 333 Location: .ro

looks like i have to start learning manual patching (a thing that a lot of time i avoided)
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blaster999 · Posted: Wed Aug 18, 2004 2:46 pm Post subject:

Well, may be alittle offtopic (just alittle). I've found this article on kerneltrap. Another issue with 2.6.8.1 and cdrecord - now memleak when recording audio cds. Patch included.

EDIT: After applying patch I haven't noticed the leak when writing audio cds. Didn't test before patching though (too lazy

)
EDIT2: Too optimistic: the CD recorded fine, but it sounds AWFUL! something is b0rked. Can someone confirm this misbehavior? Or maybe after ck's patch the patch by Kurt Garloff isn't necessary?
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Phlogiston · Posted: Wed Aug 18, 2004 3:37 pm Post subject:

I'm using the Love-Sources 2.6.8-rc4-love2 aka Staircase to Heaven Kernel and when I want to apply the patch I get this:

blaster999 · Posted: Wed Aug 18, 2004 5:06 pm Post subject:

Well, I reverted the memleak patch and got a huge memleak and a hangup while trying to write an audio CD (reset helped a lot

). Now rebooted in 2.6.7-ck5 and tried to write the same tracks on the same cd-rewritable - and everything works (sound is good and no memleaks). Be warned: if you have a cd burner, using 2.6.8.1 is not a good idea.
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Phlogiston · Posted: Wed Aug 18, 2004 5:26 pm Post subject:

hmm i just burned a cd with my 2.6.8-rc4 and had no problems. And i can also delete cdrws again: on console it works fine, i think its a k3b related issue...

blaster999 · Posted: Wed Aug 18, 2004 5:41 pm Post subject:

Writing data cds doesn't reveal the memory leak. The bug can be seen only when burning audio cds. Get a cd-rw and try to write some audio tracks on it - you'll see what I mean (save all unsaved work before doing it - your system most probably will become unusable till next reboot).
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Phlogiston · Posted: Wed Aug 18, 2004 5:48 pm Post subject:

hmm ok, so I won't try it, but I changed the default kernel back to 2.6.7

Will this problem be fixed in the next kernel version? Or is there a patch that really fixes this problem?

blaster999 · Posted: Wed Aug 18, 2004 6:00 pm Post subject:

There is a patch, but the Audio CD I've recorded using the patched 2.6.8.1 sounded AWFULLY. The patch (and info about the bug) can be found here:
http://kerneltrap.org/node/view/3659
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deadmoo · n00b Joined: 02 Feb 2004 Posts: 55 Location: MD

what exactly sounded so bad about your audio cd? I made a cd with the unpatched 2.6.8 and it was not playable at all. is the audio cd made with the patched kernel playable at least? if you are using a cdrw that me be the cause of bad audio quality and not the kernel. do you get the same results with a cdr?

blaster999 · Posted: Thu Aug 19, 2004 5:54 am Post subject:

Well, there was some audio when recorded with patched 2.6.8.1 but I hardly recognized the soundtracks. They sounded more like white noise than music. I rebooted into 2.6.7-ck5 and wrote the same tracks on the same cd-rw, the quality was good, so it's not the medium.
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squeegy · Posted: Thu Aug 19, 2004 6:11 am Post subject:

Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

If anyone wants to try it 2.6.8.1-mm2 contains fixes for the memory leak in recording cds.

it also has reiser4 in it (which will be interesting).

HTH

Phlogiston · Posted: Thu Aug 19, 2004 11:31 am Post subject:

Hmm why is reiserfs4 interesting? Which advantages will it habe? Is ist faster?

Pink · Veteran Joined: 24 Jul 2003 Posts: 1062

I think it will be interesting as it has been in patchsets such as love-sources for some months and has kind of been tested heavily in those patches.

Now, instead of using one of the patchsets or downloading directly from namesys and patching your own kernel, anyone can simply emerge (when it appears in portage) the latest mm-sources and give the filesystem a go.

This will exponentially increase exposure of this young file system to users. Something that can only be good for it I think.

The interesting part (for me) is whether it can stand the use and abuse it will receive from the hugely increased number of users and different setups and so-on.

That's all, it really is the first big exposure it has had. I think a lot of posts on lkml will be about it and I think there will be many problems (but then the mm patchset really is bleeding edge and users should know this), but in the long run it should help to mature it a bit, which it desperately needs

As for performance, there are lots of threads about it, but in summary it is meant to be faster than other filesystems due to it's structure, etc. Apart from 1 or 2 things (such as diffing patches, etc) I found it significantly slower and unstable so I removed it from my system. I really am looking forward to when it goes in the mainsteam kernels.