Some kind of race with loop in 2.4.18

Richard B. Johnson (root@chaos.analogic.com)
Thu, 23 May 2002 14:28:59 -0400 (EDT)

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If I create a 650 Mb file, make an ext2 file-system on it, then
mount it through the loop device on /mnt. It seems that I have
a virtual file-system that I could used to make an image, eventually
to burn a CR-ROM. This is how I've been doing it, but.... with
2.4.18, there is a problem.

Once the file-syetem gets about 50% full, using tar to copy
some directories from my hard disk, the hard-disk light remains
on continuously, but the file-system doesn't get any fuller.

10 second intervals, nothing happening plus SCSI Disk drive
continuously active....

Script started on Thu May 23 14:11:21 2002
# while df ; do sleep 10 ; done
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708780 10051188 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sdb1 16603376 5708812 10051156 36% /
/dev/sdc1 6356624 1198700 4835020 20% /alt
/dev/sdc3 2253284 1383916 754908 65% /home/users
/dev/sda1 1048272 282208 766064 27% /dos/drive_C
/dev/sda5 1046224 181280 864944 17% /dos/drive_D
/root/cdrom.root/cdrom.img
554284 262318 263806 50% /mnt

# exit
exit

Script done on Thu May 23 14:14:08 2002

None of the disks are full, and there is plenty of free RAM, etc.
I let this go one for about an hour, then I tried to ^C out of
`tar`. Well no, it's in the 'D' state forever....

If I create the VFS (loop-mounted file) on a disk that I am not tarring
from, tar completes okay.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).

Windows-2000/Professional isn't.

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Next message: John Levon: "Re: [announce] 'kerneltop'"
Previous message: Peter Osterlund: "Re: What to do with all of the USB UHCI drivers in the kernel?"