on 26/12/2013 16:05 Konstantin Belousov said the following:
> I provided the following patch yesterday to Peter, after the similar mail.
>
> diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
> index e3842a3..51b60de 100644
> --- a/sys/vm/vm_map.c
> +++ b/sys/vm/vm_map.c
> @@ -1207,6 +1207,7 @@ charged:
> }
> else if ((prev_entry != &map->header) &&
> (prev_entry->eflags == protoeflags) &&
> + (cow & (MAP_ENTRY_GROWS_DOWN | MAP_ENTRY_GROWS_UP)) == 0 &&
> (prev_entry->end == start) &&
> (prev_entry->wired_count == 0) &&
> (prev_entry->cred == cred ||
>
> But there were no core dump available, and I think that your note is also
> valid. I do not see why cow should be cleared from the stack direction
> bits.
>
> diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
> index e3842a3..e15e0ca 100644
> --- a/sys/vm/vm_map.c
> +++ b/sys/vm/vm_map.c
> @@ -3339,7 +3340,6 @@ vm_map_stack(vm_map_t map, vm_offset_t addrbos,
> vm_size_t max_ssize,
> * NOTE: We explicitly allow bi-directional stacks.
> */
> orient = cow & (MAP_STACK_GROWS_DOWN|MAP_STACK_GROWS_UP);
> - cow &= ~orient;
> KASSERT(orient != 0, ("No stack grow direction"));
>
> if (addrbos < vm_map_min(map) ||
>
I can confirm that the patch fixes the problem for me.
Thanks!
--
Andriy Gapon
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