I've gotten a strange new warning using a 2.6.27 guest linux kernel on VirtualBox 2.0.2:
[ 0.000000] last_pfn = 0xfff0 max_arch_pfn = 0x100000 [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at /build/buildd/linux-2.6.27/arch/x86/kernel/cpu/mtrr/main.c:1500 mtrr_trim_uncached_memory+0x153/0x386() [ 0.000000] WARNING: strange, CPU MTRRs all blank? [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.27-7-generic #1 [ 0.000000] [<c0131d25>] warn_slowpath+0x65/0x90 [ 0.000000] [<c037fb48>] ? _spin_unlock_irqrestore+0x28/0x40 [ 0.000000] [<c01052af>] ? mcount_call+0x5/0x16 [ 0.000000] [<c01324bb>] ? wake_up_klogd+0xb/0x40 [ 0.000000] [<c01326b1>] ? release_console_sem+0x1c1/0x1d0 [ 0.000000] [<c01052af>] ? mcount_call+0x5/0x16 [ 0.000000] [<c04b8666>] ? mtrr_cleanup+0x11/0x868 [ 0.000000] [<c0132a70>] ? vprintk+0x170/0x370 [ 0.000000] [<c01052af>] ? mcount_call+0x5/0x16 [ 0.000000] [<c01052af>] ? mcount_call+0x5/0x16 [ 0.000000] [<c0255c12>] ? strcmp+0x12/0x40 [ 0.000000] [<c04b932e>] mtrr_trim_uncached_memory+0x153/0x386 [ 0.000000] [<c04b978a>] ? get_mtrr_state+0x120/0x307 [ 0.000000] [<c04b4116>] setup_arch+0x51e/0x828 [ 0.000000] [<c0370020>] ? sha_transform+0x10/0x200 [ 0.000000] [<c01052af>] ? mcount_call+0x5/0x16 [ 0.000000] [<c014c249>] ? raw_notifier_chain_register+0x9/0x50 [ 0.000000] [<c04ad6a7>] start_kernel+0x6d/0x37f [ 0.000000] [<c04ad117>] ? reserve_ebda_region+0x6e/0x77 [ 0.000000] [<c04ad09e>] __init_begin+0x9e/0xa9 [ 0.000000] ======================= [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- It would seem that this post to lkml deals with this problem for VMware: http://linux.derkeiler.com/Mailing-Lists/Kernel/2008-09/msg08143.html Not knowing anything about MTRRs, I think the important question is, is the above warning message a purely cosmetic issue or will the kernel finding this "blank MTRRs" have any ill effects on the kernel's operation? Thanx! b.
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