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> Remote printing problem becomes total system meltdown, Can't even login
jamespetts
post Feb 11 2009, 05:54 PM
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At home, there are four computers: study, bedroom, kitchen and parlour. Kitchen and parlour are running Ubuntu Intrepid; bedroom is running Ubuntu Hardy and Study is running Windows XP.

Earlier this evening, a problem was found printing from kitchen to parlour. I had earlier configured cups using the GUI to print from kitchen to parlour without difficulty, so found this odd. I spent a great deal of time trying to solve the problem without success, the problem always appearing to be that the server was refusing permission to access it to the clients, even though the server was configured to allow remote printing and remote administration, the clients' IPs were in the allowed list, all relevant usernames were given permission to print, and it had worked with those exact settings recently before.

I tried to configure the printer from bedroom (I had not previously set up the printer from there), and got exactly the same error. I tried to access the CUPS web configuration on parlour, from bedroom and I got a 403 (I had earlier tried the same from kitchen with the same result). So, on bedroom, I tried to configure the printer through Bedroom's CUPS web interface. I added a printer, and selected the appropriate driver (HP Photosmart D7300 series). I sent it a test page from the web interface, but nothing printed - it was marked perpetually as "processing".

I went to parlour to investigate, and could now not access the CUPS web interface even locally - it appeared that the web server was not giving any sort of response. I tried restarting CUPS from the command line, but got a segmentation fault. Trying to reboot from the command line also gave a segmentation fault. I rebooted from the GUI. The loading bar screen appeared, but there were bizarre artefacts (looking like fragments of the blank loading bar under the Ubuntu logo) next to the live loading bar, which progressed as normal.

I reached the login screen as normal, but any attempt to login just brought the interface back to the login screen again, even with "failsafe terminal" selected as the session. I tried rebooting in failsafe mode from the GRUB menu, and attempted to use the automatic repair tools there (FSCK, XFIX, and DPKG fix), but, on rebooting again, there was no change. I am at a total loss, and very concerned that something quite drastic but utterly incomprehensible has gone wrong. I cannot even access shared NFS folders on parlour from other computers. I should be very, very grateful for any assistance at all, especially as this is my parents' computer that I help to maintain for them and they really do rely on it for a great many things.
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michaelk
post Feb 12 2009, 05:26 PM
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Just taking a stab in the dark but make sure your /(root) partition is not full using failsafe mode.
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jamespetts
post Feb 12 2009, 05:32 PM
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QUOTE (michaelk @ Feb 12 2009, 05:26 PM) *
Just taking a stab in the dark but make sure your /(root) partition is not full using failsafe mode.



Thank you very much for your reply :-) No, the root partition is not full - the entire hard drive has only two primary partitions (and no logical partitions): / and swap. The / partition is about 10% full. I was able to check by booting from a live CD when trying to test to see whether there was some hardware failure (there was none apparent). Also on the theme of hardware testing, I ran Memtest86+ for about 15 hours with 0 errors.

There is a mounted folder (at /backup) that is virtually full, but I cannot imagine that that would cause the sort of failure that I have described. Thank you again very much for replying :-)
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michaelk
post Feb 12 2009, 07:31 PM
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No problems mounting or accessing the / partition from a live CD. No obvious errors when looking at the output of the dmesg command?
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jamespetts
post Feb 13 2009, 04:08 AM
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QUOTE (michaelk @ Feb 12 2009, 07:31 PM) *
No problems mounting or accessing the / partition from a live CD. No obvious errors when looking at the output of the dmesg command?


Thank you very much for your help. There are some errors on dmesg when booting from the LiveCD, actually (I am writing this reply from the problem system on the LiveCD now). Here is the section with the errors (I tried to post the full output, but the forum software complained that it was too long):

CODE
[    8.235527] kjournald starting.  Commit interval 5 seconds
[    8.235543] EXT3-fs: mounted filesystem with ordered data mode.
[    8.659624] end_request: I/O error, dev sr0, sector 1431184
[    8.659635] Buffer I/O error on device sr0, logical block 178898
[    9.266496] end_request: I/O error, dev sr0, sector 1431184
[    9.266507] Buffer I/O error on device sr0, logical block 178898
[    9.873350] end_request: I/O error, dev sr0, sector 1431184
[    9.873354] Buffer I/O error on device sr0, logical block 178898
[   10.480213] end_request: I/O error, dev sr0, sector 1431184
[   10.480221] Buffer I/O error on device sr0, logical block 178898
[   11.087082] end_request: I/O error, dev sr0, sector 1431184
[   11.087090] Buffer I/O error on device sr0, logical block 178898
[   11.264216] usb-storage: device scan complete
[   11.264701] scsi 6:0:0:0: Direct-Access     HP       Photosmart D7300 1.00 PQ: 0 ANSI: 2
[   11.274478] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[   11.274674] sd 6:0:0:0: Attached scsi generic sg4 type 0
[   11.518500] kjournald starting.  Commit interval 5 seconds
[   11.518517] EXT3-fs: mounted filesystem with ordered data mode.
[   11.693943] end_request: I/O error, dev sr0, sector 1431184
[   11.693953] Buffer I/O error on device sr0, logical block 178898
[   12.604241] end_request: I/O error, dev sr0, sector 1431184
[   12.604250] Buffer I/O error on device sr0, logical block 178898
[   13.017455] kjournald starting.  Commit interval 5 seconds
[   13.017472] EXT3-fs: mounted filesystem with ordered data mode.
[   13.211187] end_request: I/O error, dev sr0, sector 1431184
[   13.211198] Buffer I/O error on device sr0, logical block 178898
[   14.784902] kjournald starting.  Commit interval 5 seconds
[   14.784918] EXT3-fs: mounted filesystem with ordered data mode.
[   16.924584] ISO 9660 Extensions: Microsoft Joliet Level 3
[   17.069405] ISO 9660 Extensions: RRIP_1991A
[   17.617073] aufs 20080922


Any clues as to what the problem might be from that?

Edit: I have found further reference to "sr0" earlier in the output, which might be of assistance:
CODE
[    5.488463] sr0: scsi3-mmc drive: 4x/40x writer dvd-ram cd/rw xa/form2 cdda tray
[    5.488471] Uniform CD-ROM driver Revision: 3.20
[    5.488607] sr 5:0:0:0: Attached scsi CD-ROM sr0
[    5.491587] sr1: scsi3-mmc drive: 0x/50x cd/rw xa/form2 cdda tray
[    5.491743] sr 5:0:1:0: Attached scsi CD-ROM sr1


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michaelk
post Feb 13 2009, 12:25 PM
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sr0 and sr1 are your CDROM drives. The errors posted are from sr0 which I assume is the live CD.
How many hard drives are attached including removable USB etc.
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jamespetts
post Feb 15 2009, 04:03 PM
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QUOTE (michaelk @ Feb 13 2009, 12:25 PM) *
sr0 and sr1 are your CDROM drives. The errors posted are from sr0 which I assume is the live CD.
How many hard drives are attached including removable USB etc.


Thank you very much for your reply :-) Yes, I suspected that sr0 is a CD; I am not sure where that gets me, if anywhere. There is only one local hard drive in the system: other are setup to be mounted via NFS or SAMBA, but I don't think that that's what you meant, is it? There are two optical drives and one old-fashioned floppy drive, too, all IDE (either old-fashioned ribbon cable IDE for the optical drives, or SATA (but running through a third party bridge chip onto the motherboard's PATA port) for the hard drive).

This problem seems to be login-specific: even when I try CTRL+ALT+F1 at the login screen, I get a text login which, when a valid username and password pair are entered, simply re-prints the text login again. Entering an invalid username/password pair gives the correct "login incorrect" response, so the system can discriminate between valid and invalid pairs: it is not a simple case of loss of username/password data. I suspect that a similar problem might have precipitated the inability to print remotely (the system companied that authorisation was denied), and even problems with remote backups (authorisation problems again seemed to be the cause), but what would cause the whole login system to fail completely? And why the sudden segfaults when trying even to reboot? This is all very mysterious.
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michaelk
post Feb 17 2009, 12:29 PM
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Very mysterious.
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jamespetts
post Feb 17 2009, 03:39 PM
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QUOTE (michaelk @ Feb 17 2009, 12:29 PM) *
Very mysterious.


Yes, quite. Can anyone assist? The system has been more or less unusable for nearly a week now (it is running from a LiveCD, but that is very basic, of course). If nobody can think of a solution to this problem, or a possible cause, can anyone at least suggest how I might go about reinstalling without losing the data in /home and all of the endless hours that I have spent setting up various items of configuration (mythtv, firewall, scanner, sound card with difficult drivers that won't give AC3 output even though all the documentation says that it should and even though it worked on Windows, home networking configuration, printer, and other things that I have probably forgotten, all of which seem to throw up completely inexplicable and incomprehensible errors or failures when I try to set them up that either take weeks (or sometimes months) to solve or never get solved at all)?
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