Stuart Henderson <s...@spacehopper.org> writes:
> On 2017/10/21 12:04, Tim Stewart wrote:
>> *49727 296965 0 0 7 0x14200 crynlk
>
> aha, it was that one. Try this diff on top.
>
> Index: fpu.c
> ===================================================================
> RCS file: /cvs/src/sys/arch/amd64/amd64/fpu.c,v
> retrieving revision 1.38
> diff -u -p -r1.38 fpu.c
> --- fpu.c 14 Oct 2017 04:44:43 -0000 1.38
> +++ fpu.c 21 Oct 2017 16:16:14 -0000
> @@ -347,7 +347,7 @@ void
> fpu_kernel_enter(void)
> {
> struct cpu_info *ci = curcpu();
> - uint32_t cw;
> + struct savefpu *sfp;
> int s;
>
> /*
> @@ -376,10 +376,11 @@ fpu_kernel_enter(void)
>
> /* Initialize the FPU */
> fninit();
> - cw = __INITIAL_NPXCW__;
> - fldcw(&cw);
> - cw = __INITIAL_MXCSR__;
> - ldmxcsr(&cw);
> + sfp = &proc0.p_addr->u_pcb.pcb_savefpu;
> + memset(&sfp->fp_fxsave, 0, sizeof(sfp->fp_fxsave));
> + sfp->fp_fxsave.fx_fcw = __INITIAL_NPXCW__;
> + sfp->fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__;
> + fxrstor(&sfp->fp_fxsave);
> }
>
> void
I've been running with this additional patch for a couple of hours and
the hang has not reappeared. I'll keep the system active and confirm
thta everything looks good tomorrow.
I swear I've seen this patch before on a list but can't find the
original. Can someone give me or point me at some context, so I know
what I've just done? :)
Thanks!
-TimS
--
Tim Stewart
-----------
Mail: t...@stoo.org
Matrix: @tim:stoo.org
