On Fri, 7 Nov 2003, Jin Guojun [NCS] wrote:
A KLD module ncs_time_ctl.ko compiled on both 4.8 and 4.9 hosts can be
loaded by kldload on any 4.8 machine. But neither .ko files can be
loaded on a 4.9 machine. The error is:
4.9 # kldload -v ./ncs_time_ctl.ko kldload: can't load ./ncs_time_ctl.ko: Exec format error
kldload should give more error information on what function it failed to load.
Is this possible a 4.9 bug in kldload? or does some KLD mechanism has
been changed in 4.9-RELEASE? Is there any way to analyze what is wrong
in the 4.9 LKD system?
Unfortunately, the UNIX "errno" mechanism isn't very expressive. However,
the kernel linker will send debugging output to the system console. Check
dmesg and see if there's more information there. Typically, this error
will be the result of a failure to link symbols in the module: either due
to a symbol already present, or a missing dependency. To debug this
further, look at the console output, and also compare the output of "nm" on the .ko built on 4.8 and 4.9 to see if its dependencies or exposed
symbols have changed.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
[EMAIL PROTECTED] Network Associates Laboratories
dmesg actually tells the missing function in patched kernel. "make depend & make" did NOT recompile the patched code somehow under 4.9. Removing the object code and recompiling the kernel fixed the problem. I will look into it to see what causes this compile problem.
Thanks,
-- ------------ Jin Guojun ----------- v --- [EMAIL PROTECTED] --- Distributed Systems Department http://www.itg.lbl.gov/~jin M/S 50B-2239 Ph#:(510) 486-7531 Fax: 486-6363 Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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