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SubjectRe: clocksource mutex deadlock, cat current_clocksource (2.6.33-rc6/7)
Hi,

On Mon, Feb 08, 2010 at 11:06:58AM +0100, Thomas Gleixner wrote:
> EIP: 0060:[<c1045170>] EFLAGS: 00000082 CPU: 0
> EIP is at timekeeping_forward_now+0x116/0x139
>
> I don't see what might make the machine stuck here. Can you decode the
> source line with "addr2line -e vmlinux c1045170" please ?

And the winner is:
/usr/src/linux-2.6.33-rc7/include/linux/math64.h:91

static __always_inline u32
__iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
{
u32 ret = 0;

while (dividend >= divisor) {
/* The following asm() prevents the compiler from
optimising this loop into a modulo operation. */
asm("" : "+rm"(dividend));

dividend -= divisor;
ret++;
}

*remainder = dividend;

return ret;
}


while ......



Do I see a divisor == 0 here?? ;)

Andreas Mohr


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