On Sun, 20 May 2007 22:18:09 -0400
Gary Duzan <gary@duzan.org> wrote:

>    I tried the following, but it didn't seem to help. The easiest
> way I've found to crash X is to bring up a bunch of tabs in firefox,
> but parallel kernel builds are dying, too.

I've been using the following patch since yamt-idlelwp was merged in.
With that patch it works rock solid (Frank Van Der Linden is still 
trying to find the problem) so it's a temporary workaround:

$ cat
locore.diff Index: locore.S
===================================================================
RCS file: /cvsroot/src/sys/arch/amd64/amd64/locore.S,v
retrieving revision 1.23
diff -b -u -r1.23 locore.S
--- locore.S    19 May 2007 20:20:47 -0000      1.23
+++ locore.S    20 May 2007 00:29:36 -0000
@@ -843,6 +843,8 @@
        movq    CPUVAR(SCRATCH),%r15
        subq    $32,%rsp
        INTR_SAVE_GPRS
+       movw    %fs,TF_FS(%rsp)
+       movw    %gs,TF_GS(%rsp)
        movw    %es,TF_ES(%rsp)
        movw    $(LSEL(LUDATA_SEL, SEL_UPL)),TF_DS(%rsp)
        movq    %r11, TF_RFLAGS(%rsp)   /* old rflags from syscall insn */
@@ -883,6 +885,8 @@
        cli
        swapgs
        movw    TF_ES(%rsp),%es
+       movw    TF_FS(%rsp),%fs
+       movw    TF_GS(%rsp),%gs
        INTR_RESTORE_GPRS
        movw    $(LSEL(LUDATA_SEL, SEL_UPL)),%r11
        movw    %r11,%ds
$


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