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    SubjectRe: [BUG] 2.5.65: Caching MSR_IA32_SYSENTER_CS kills dosemu

    On Mon, 31 Mar 2003, Wayne Whitney wrote:
    >
    > I run dosemu 1.0.2.1 on the 2.5.x kernels. Upgrading from 2.5.64 to
    > 2.5.65 (or 2.5.66) causes dosemu to no longer work: it locks up the
    > machine shortly after I run it.

    There appears to be at least one bug (that is longstanding but might be
    made worse by the MSR stuff). However, that one should matter only with
    preemption enabled. What's your configuration?

    Also, do you actually have a new library that uses SYSENTER (ie recent
    redhat beta), and whct kind of CPU do you have?

    Linus


    ----
    ===== arch/i386/kernel/vm86.c 1.21 vs edited =====
    --- 1.21/arch/i386/kernel/vm86.c Sun Mar 9 18:49:37 2003
    +++ edited/arch/i386/kernel/vm86.c Mon Mar 31 11:23:50 2003
    @@ -289,9 +289,10 @@
    asm volatile("movl %%fs,%0":"=m" (tsk->thread.saved_fs));
    asm volatile("movl %%gs,%0":"=m" (tsk->thread.saved_gs));

    - tss = init_tss + smp_processor_id();
    + tss = init_tss + get_cpu();
    tss->esp0 = tsk->thread.esp0 = (unsigned long) &info->VM86_TSS_ESP0;
    disable_sysenter(tss);
    + put_cpu();

    tsk->thread.screen_bitmap = info->screen_bitmap;
    if (info->flags & VM86_SCREEN_BITMAP)
    -
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