Date: Thu, 9 May 2013 19:04:33 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Jim Ohlstein <jim@ohlste.in> Cc: freebsd-stable@freebsd.org Subject: Re: Apparent regression in r250359 Message-ID: <20130509160433.GW3047@kib.kiev.ua> In-Reply-To: <518BC3E4.1030104@ohlste.in> References: <518A880C.3090906@ohlste.in> <20130509053055.GM3047@kib.kiev.ua> <518BAEFB.5090204@ohlste.in> <20130509143038.GV3047@kib.kiev.ua> <518BC3E4.1030104@ohlste.in>
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On Thu, May 09, 2013 at 11:42:28AM -0400, Jim Ohlstein wrote:
> On 05/09/13 10:30, Konstantin Belousov wrote:
> > On Thu, May 09, 2013 at 10:13:15AM -0400, Jim Ohlstein wrote:
> >> # sysctl hw.model
> >> hw.model: AMD FX(tm)-8350 Eight-Core Processor
> > Ahh, so it seems that this is a CPU with the LWP.
> > Please try the patch at the end of message.
>
> Same error
>
> >
> > As another workaround, which does not disable AVX support, you
> > could try loader tunable hw.xsave_mask=0x7.
>
> This works
Hm, I see another bug in the next line as well. Could you try this
updated patch ?
diff --git a/sys/amd64/amd64/fpu.c b/sys/amd64/amd64/fpu.c
index de79baa..9bc8a2f 100644
--- a/sys/amd64/amd64/fpu.c
+++ b/sys/amd64/amd64/fpu.c
@@ -687,8 +687,8 @@ fpugetregs(struct thread *td)
offsetof(struct xstate_hdr, xstate_bv));
max_ext_n = flsl(xsave_mask);
for (i = 0; i < max_ext_n; i++) {
- bit = 1 << i;
- if ((*xstate_bv & bit) != 0)
+ bit = 1ULL << i;
+ if ((xsave_mask & bit) == 0 || (*xstate_bv & bit) != 0)
continue;
bcopy((char *)fpu_initialstate +
xsave_area_desc[i].offset,
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