The branch stable/14 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=f0d6377a3eab6d07f73d5b34922c2b3d9019554c
commit f0d6377a3eab6d07f73d5b34922c2b3d9019554c Author: Konstantin Belousov <[email protected]> AuthorDate: 2024-05-08 13:58:52 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2024-05-19 00:57:54 +0000 swap-like pagers: assert that writemapping decrease does not pass zero (cherry picked from commit 6ada4e8a0ae901f0012015c8d277d80aad7d8f37) --- sys/fs/tmpfs/tmpfs_subr.c | 3 +++ sys/vm/swap_pager.c | 4 ++++ 2 files changed, 7 insertions(+) diff --git a/sys/fs/tmpfs/tmpfs_subr.c b/sys/fs/tmpfs/tmpfs_subr.c index 13323d50228a..b12e9b91fabc 100644 --- a/sys/fs/tmpfs/tmpfs_subr.c +++ b/sys/fs/tmpfs/tmpfs_subr.c @@ -179,6 +179,9 @@ tmpfs_pager_release_writecount(vm_object_t object, vm_offset_t start, KASSERT((object->flags & OBJ_ANON) == 0, ("%s: object %p with OBJ_ANON", __func__, object)); old = object->un_pager.swp.writemappings; + KASSERT(old >= (vm_ooffset_t)end - start, + ("tmpfs obj %p writecount %jx dec %jx", object, (uintmax_t)old, + (uintmax_t)((vm_ooffset_t)end - start))); object->un_pager.swp.writemappings -= (vm_ooffset_t)end - start; new = object->un_pager.swp.writemappings; tmpfs_pager_writecount_recalc(object, old, new); diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c index c8b08e0e8315..ce578cc4fd8b 100644 --- a/sys/vm/swap_pager.c +++ b/sys/vm/swap_pager.c @@ -3161,6 +3161,10 @@ swap_pager_release_writecount(vm_object_t object, vm_offset_t start, VM_OBJECT_WLOCK(object); KASSERT((object->flags & OBJ_ANON) == 0, ("Splittable object with writecount")); + KASSERT(object->un_pager.swp.writemappings >= (vm_ooffset_t)end - start, + ("swap obj %p writecount %jx dec %jx", object, + (uintmax_t)object->un_pager.swp.writemappings, + (uintmax_t)((vm_ooffset_t)end - start))); object->un_pager.swp.writemappings -= (vm_ooffset_t)end - start; VM_OBJECT_WUNLOCK(object); }
