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    SubjectRe: lguest rebroken in 2.6.22-rc3-mm1
    On Mon, Jun 04, 2007 at 10:28:20AM -0700, Andrew Morton wrote:
    > On Mon, 4 Jun 2007 12:19:33 -0500 Matt Mackall <mpm@selenic.com> wrote:
    >
    > > On Wed, May 23, 2007 at 09:27:40AM +1000, Rusty Russell wrote:
    > > > On Tue, 2007-05-22 at 17:38 -0500, Matt Mackall wrote:
    > > > > [ 0.120007] EIP is at resync_sc_freq+0x4b/0x56
    > > >
    > > > Hi Matt,
    > > >
    > > > Thanks for the report! Andrew should have these two patches queued,
    > > > but here they are again:
    > > >
    > > > If you set tsc_disable (eg "notsc" on cmdline), sched-clock.c gives a
    > > > divide by zero on boot.
    > > >
    > > > Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
    > > >
    > > > ---
    > > > arch/i386/kernel/sched-clock.c | 2 +-
    > > > 1 file changed, 1 insertion(+), 1 deletion(-)
    > > >
    > > > ===================================================================
    > > > --- a/arch/i386/kernel/sched-clock.c
    > > > +++ b/arch/i386/kernel/sched-clock.c
    > > > @@ -103,7 +103,7 @@ static void resync_sc_freq(struct sc_dat
    > > > static void resync_sc_freq(struct sc_data *sc, unsigned int newfreq)
    > > > {
    > > > sc->sync_base = jiffies;
    > > > - if (!cpu_has_tsc) {
    > > > + if (!cpu_has_tsc || tsc_disable) {
    > > > sc->unstable = 1;
    > > > return;
    > > > }
    > >
    > > Looks like this one got lost in rc3-mm1.
    > >
    >
    > Andi said that he fixed the zero-divide by other means?

    Got this, patch fixed it:

    [ 0.392024] divide error: 0000 [#1]
    [ 0.392024] PREEMPT
    [ 0.392024] Modules linked in:
    [ 0.392024] CPU: 0
    [ 0.392024] EIP: 0061:[<c010995a>] Not tainted VLI
    [ 0.392024] EFLAGS: 00010246 (2.6.22-rc3-mm1 #145)
    [ 0.392024] EIP is at resync_freq+0x7a/0x85
    [ 0.392024] eax: 3d090000 ebx: c1c04f70 ecx: 00000e70 edx: 00000000
    [ 0.392024] esi: 00000000 edi: c1c04f80 ebp: c1c04f68 esp: c1c04f64
    [ 0.392024] ds: 007b es: 007b fs: 0000 gs: 0000 ss: 0069
    [ 0.392024] Process swapper (pid: 1, ti=c1c04000 task=c1c20ae0 task.ti=c1c04000)
    [ 0.392024] Stack: 00000000 c1c04f84 c058eb2d 00000000 00000000 00000000 00000000 00000000
    [ 0.392024] c1c04fe0 c058c6c4 c1c04fac c0119c22 00000000 00000002 c054c320 c1c20ae0
    [ 0.392024] 00000000 c05b2dc0 c1c20ae0 00000000 00000001 c058c608 00000000 00000000
    [ 0.392024] Call Trace:
    [ 0.392024] [<c058eb2d>] init_sched_clock+0x5c/0x90
    [ 0.392024] [<c058c6c4>] kernel_init+0xbc/0x23e
    [ 0.392024] [<c0104a6b>] kernel_thread_helper+0x7/0x10
    [ 0.392024] =======================
    [ 0.392024] INFO: lockdep is turned off.
    [ 0.392024] Code: 30 0c 55 c0 89 15 34 0c 55 c0 e8 75 a6 00 00 90 31 c9 89 d1 a3 28 0c 55 c0 ba 00 00 00 00 b8 00 00 09 3d 89 0d 2c 0c 55 c0 31 d2 <f7> 73 08 a3 20 0c 55 c0 5b 5d c3 55 b8 01 00 00 00 89 e5 57 56
    [ 0.392024] EIP: [<c010995a>] resync_freq+0x7a/0x85 SS:ESP 0069:c1c04f64
    [ 0.392024] Kernel panic - not syncing: Attempted to kill init!


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