Hello Fernendo, I now have two machines running the same version of the CCRMA kernel (2.6.14-0.10.rrt.rhfc4.ccrma). One is an old Pentium III and that runs fine. The other is an AMD64 running in i386 mode and that gives me a kernel Oops at boot. Strangely enough I am able to use the machine and I only noticed this from looking at dmesg. I have attached the code to the tail of this email. Also, if I have a question about building a kernel module that is having trouble with the preempt spinlock changes who should I talk to? I emailed Ingo but haven't heard back for a few days. Thanks for the kelp and the excelent packages! -thewade BUG: Unable to handle kernel paging request at virtual address f895e672 printing eip: f895e672 *pde = 37c5f067 Oops: 0000 [#1] PREEMPT Modules linked in: i2c_sis96x(U) i2c_core(U) snd_intel8x0m(U) snd_intel8x0(U) snd_ac97_codec(U) snd_ac97_bus(U) snd_hdsp(U) snd_rawmidi(U) snd_seq_dummy(U) snd_seq_oss(U) snd_seq_midi_event(U) snd_seq(U) snd_seq_device(U) snd_pcm_oss(U) snd_mixer_oss(U) snd_pcm(U) snd_timer(U) snd_page_alloc(U) snd_hwdep(U) snd(U) soundcore(U) rt2500pci(U) rt2x00core(U) ieee80211(U) ieee80211_crypt(U) sis900(U) mii(U) serio_raw(U) joydev(U) ext3(U) jbd(U) CPU: 0 EIP: 0060:[<f895e672>] Not tainted VLI EFLAGS: 00010246 (2.6.14-0.10.rrt.rhfc4.ccrma) EIP is at 0xf895e672 eax: 00000000 ebx: f895b9b0 ecx: 00000001 edx: 00000000 esi: 00000000 edi: 00000000 ebp: 00000000 esp: f7dcffd8 ds: 007b es: 007b ss: 0068 preempt: 00000001 Process shpchpd_event (pid: 1077, threadinfo=f7dce000 task=f7dbb8b0 stack_left=8100 worst_left=-1) Stack: f896606c 0000007b ffffffff f895b9b0 c01013e9 00000000 00000000 00000000 00000000 00000000 Call Trace: [<c01013e9>] kernel_thread_helper+0x5/0xc (20) Code: Bad EIP value. <6>ehci_hcd 0000:00:03.3: EHCI Host Controller