trace.so failing to load on newer kernels
On 10/14/2010 01:06 AM, Dave Anderson wrote:
> ----- "Jeff Moyer" <firstname.lastname@example.org> wrote:
>> I was trying to use the trace.so extension module, but it was bailing
>> out early with no explanation. I tracked it down to the fact that the
>> system member of the trace_event_call structure no longer exists. It
>> was moved up to the class structure. The change was introduced in this
>> upstream commit:
>> commit 8f0820183056ad26dabc0202115848a92f1143fc
>> Author: Steven Rostedt <email@example.com>
>> Date: Tue Apr 20 10:47:33 2010 -0400
>> tracing: Create class struct for events
>> I don't have the cycles to fix this up right now, so I was hoping
>> someone else would. ;-) Bonus points for printing useful error messages
>> when the module fails to load for some reason.
> (I've added the author Lai Jiangshan to the cc: list to address this issue.)
> Hello Lai,
> Can I also make a couple suggestions/requests when you fix this issue?
> (1) There should be a protection mechanism in place to prevent the use
> of a bogus structure member offset in any virtual address calculation.
> (2) I've also run into the frustration of trying to figure out which
> of the multiple failure reasons that can occur when the command
> ftrace_init fails to load, so I agree with Jeff that it would be
> very helpful to put some error messages in place.
> (3) When you make the fix for for the movement of the "system" member
> from the ftrace_event_call to the ftrace_event_class structure,
> please make it backwards-compatible so that the module still
> works for earlier kernels.
Our customer's and my vendor's requirement is very low: make it work at
the incoming RHEL6(2.6.32). so I don't get so much time to make it always
updated. I had written a patch which make it fit for the kernel newer than
2.6.32, but it still not fit the newest kernel, I will rewrite it,
(fit to the new kernel and compatible to the old kernels) and more checks.
Thank you for your suggestions, I will use them in the new patches.
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