Do not coalesce stack entry, vm_map_stack() asserts that the requested
region is claimed by a new entry. Pass MAP_STACK_GROWS_DOWN and MAP_STACK_GROWS_UP flags to vm_map_insert() from vm_map_stack(), to really turn off coalescing code and call to vm_map_simplify_entry() [1]. Reported by: avg, peter, many Tested by: avg, peter Noted by: avg [1] Sponsored by: The FreeBSD Foundation MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=259951
@ -1207,6 +1207,7 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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}
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else if ((prev_entry != &map->header) &&
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(prev_entry->eflags == protoeflags) &&
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(cow & (MAP_ENTRY_GROWS_DOWN | MAP_ENTRY_GROWS_UP)) == 0 &&
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(prev_entry->end == start) &&
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(prev_entry->wired_count == 0) &&
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(prev_entry->cred == cred ||
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@ -3339,7 +3340,6 @@ vm_map_stack(vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
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* NOTE: We explicitly allow bi-directional stacks.
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*/
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orient = cow & (MAP_STACK_GROWS_DOWN|MAP_STACK_GROWS_UP);
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cow &= ~orient;
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KASSERT(orient != 0, ("No stack grow direction"));
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if (addrbos < vm_map_min(map) ||
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