Zeroing the page in between improves the situation substantially.
Although I'm not sure if it is fixed.
pdb seems broken, to use pdb the symbols for the pdb_ctx variable must
be present, but they aren't:
my options:
verbose ?= y
debug ?= y
debugger ?= y
perfc ?= n
trace ?= n
(gdb) ptype pdb_ctx
type = <data variable, no debug info>
gcc -nostdinc -fno-builtin -fno-common -fno-strict-aliasing -O3
-iwithprefix include -Wall -Werror -fomit-frame-pointer -pipe
-I/t/niners/users/xen/xeno-unstable.bk.work.1.1303/xen/include
-Wno-pointer-arith -Wredundant-decls -msoft-float -m32 -march=i686
-DVERBOSE -DXEN_DEBUGGER -c pdb-stub.c -o pdb-stub.o
-- If you stick a -g in there it works a little better:
(gdb) p pdb_ctx
$1 = {
valid = 0x0,
domain = 0x0,
process = 0xfc53bd1a,
system_call = 0x0,
ptbr = 0x0
}
(gdb)
but it still won't give me a backtrace like it used to:
(XEN) pdb: [m12,8]
(XEN) pdb: L2 error (0x12)
(XEN) pdb: [m12,8]
(XEN) pdb: L2 error (0x12)
(XEN) pdb: [m12,1]
(XEN) pdb: L2 error (0x12)
(XEN) pdb: [m12,1]
(XEN) pdb: L2 error (0x12)
(XEN) pdb: [m12,1]
(XEN) pdb: L2 error (0x12)
(XEN) pdb: [m12,1]
(XEN) pdb: L2 error (0x12)
(XEN) pdb: [mc01ab330,1]
(XEN) pdb: L2 error (0xc01ab330)
(XEN) pdb: [mc01ab330,1]
(XEN) pdb: L2 error (0xc01ab330)
On Fri, 10 Sep 2004, Keir Fraser wrote:
> > >
> > > Note that we don't support direct writing to pde's (yet), only to leaf
> > > entries in the multi-level page table.
> >
> > Ahh - then it wouldn't help with this particular problem. I'm getting
> > an error when I unpin a page as an L2 table and then immediately re-pin
> > it as an L1.
>
> Please post us the debug output from Xen when this occurs. Might you
> still be running on the L2? Whatever -- we can probably narrow it down
> with the debug tracing.
>
> -- Keir
>
>
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