Red Hat Bugzilla – Bug 64676
accessing LS120 disk drive can hang system
Last modified: 2007-04-18 12:42:29 EDT
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Description of problem:
When accessing the LS120 drive the system either hangs when reading the disk or
when umnounting it. This worked fine under RH7.1 IA64, but not under RH7.2. The
kernel has been updated to 2.4.9-31 and all package updates have been applied.
As a side note, if I managed to read the disk at all the directory list look ok
but any file contents are garbage. No entries in the system log files have ever
been added due to this, although once a SEGV was flashed on the screen prior to
the system hanging.
Red Hat service request 205284 was also raised against this.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.mount /dev/hda on /mnt/ls120
2.ls -l /mnt/ls120
3.read a file from /mnt/ls120
Actual Results: the system will either hang at step 3 or 4.
Expected Results: shouldn't hang
This would seem to be related to bug#60709. If we turn of dma with 'hdparm -
d0 /dev/hda' then not only does it not hang but we can actually read real data
drom files on the disk rather than garbage. Unlike 60709 we only have 4GB of
For drives that behave this should be resolved in the 2.4.20 errata. If not
please give me the info on the drive and I'll blacklist it properly. Old kernels
kept the LS120 in PIO always ...