Red Hat Bugzilla – Bug 74173
ddcprobe can trigger a kernel panic
Last modified: 2015-01-04 17:02:00 EST
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Description of problem:
On a small number of our systems, the ddcprobe command causes a kernel panic.
It doesn't happen always and only some systems exhibit this behaviour.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Run ddcprobe many times (eg in a loop of "ddcprobe; sleep 5")
Actual Results: We get a few lines of identical ddcprobe output and then the
Expected Results: We should have just seen large number of identical DDC lines.
At the URL quotes you can find our manual transcription of the screen contining
the kernel panic message, the output of a run of ddcprobe and the hardware
configuration as spotted by kudzu.
$ rpm -q kernel
$ rpm -qf /usr/sbin/kudzu
$ rpm -qf /usr/sbin/ddcprobe
please try a more recent kernel too; we've fixed quite a few bugs in the vm86
emulation code (and ddcprobe uses that a lot ;)
We have tried it again with kernel-2.4.18-11 and the problem occurs in exactly
the same way. This is the latest in our "null" mirror. If you had a different
kernel in mind please give specifics.
Further data: We have built kernel-2.4.18-7.80 with apm configured as a module.
With the module unloaded our kernel survives ddcprobe without difficulty.
Loading the module causes the crashes to recur.
This bug has been inappropriately marked MODIFIED. Please review the bug life
cycle information at
Changing bug status to ASSIGNED.