On Wed, Feb 08, 2012 at 09:55:31AM -0500, Jean Delvare wrote: > On Wed, 8 Feb 2012 06:16:41 -0800, Guenter Roeck wrote: > > On Wed, Feb 08, 2012 at 06:39:46AM -0500, Patrick Marty wrote: > > > Guenter, > > > > > > I have tested all driver versions with the 3 linux kernels installed > > > on my system : > > > * 3.0.0-15-generic > > > * 3.0.0-12-generic > > > * 2.6.38-13-generic > > > > > > I have re-compiled and re-installed each driver version for each kernel version. > > > > > > All versions work with kernel 2.6.38-13 ( but you probably already > > > know that ) and ... all versions fail with kernels 3.0.0.* ( I mean I > > > got an error message when loading the driver with modprobe ) > > > > > > I have also tested all driver versions with linux running from an usb > > > key with kernel 3.0.0-12-generic. > > > > > > And all versions worked ! No error after loading the driver :) > > > > > > The main differences I could think of with the linux installed on my > > > hard drive with the linux from usb key were : > > > * not the same gcc version : > > > * 4.6.1 on usb key > > > * 4.4.6 on hard drive > > > * not the same graphic card driver > > > * nouveau driver on usb key > > > * nvidia driver on hard drive > > > > > > So I have also tried all driver versions compiled with gcc 4.6.1 with > > > linux kernel 3.0.0-15-generic ( I unload the driver with modprobe -r > > > ... before reloading it and I checked with dmesg & lsmod that the > > > driver was loaded :) ). > > > And all versions worked :) > > > > > > So It seems that compiling with gcc 4.4.6 is the source of the problem. > > > And compiling the driver with gcc 4.6 solved it. > > > Do you have any idea why ? > > > > > Puzzled. I am copying Jean and the list ... Jean, any idea ? Compiler bug ? > > Yes, this really looks like a compiler bug. > > There's at least one known kernel miscompilation issue with gcc 4.4.4: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45312 > > > > I can send you the .o & .ko files compiled with gcc 4.6 if you need them. > > > > Would be great if you could do that, with -DDEBUG as suggested by Jean > > in his other e-mail, to let us find the offending source. > > > > Please keep Jean and the list copied on your replies. We'll need as much support > > as we can get on this one. > > Unfortunately none of my systems has gcc 4.4... I have 4.3, 4.5 and 4.6. > I have 4.4.3 and 4.4.5 (and 4.5.1, and 4.6.1). Never had any problems with it, though. Given the bug report above, I don't think it would help much to even try any of those versions anyway; we would need 4.4.6. Would it be worthwhile trying to track this down further ? 4.4.6 is the latest gcc version from the 4.4 series, so the problem might bite us again. Guenter _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
