diff options
| author | alc <alc@FreeBSD.org> | 2004-02-16 03:43:57 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2004-02-16 03:43:57 +0000 |
| commit | 600caa157eae5e9619a172eb362d497bf39da392 (patch) | |
| tree | 1515e6dab984bff1f3aa4032a1e7304666a31760 | |
| parent | 1e2ef501f0d5f552cae8e4514235ae939d09a69d (diff) | |
| download | FreeBSD-src-600caa157eae5e9619a172eb362d497bf39da392.zip FreeBSD-src-600caa157eae5e9619a172eb362d497bf39da392.tar.gz | |
Correct a long-standing race condition in vm_contig_launder() that could
result in a panic "vm_page_cache: caching a dirty page, ...": Access to the
page must be restricted or removed before calling vm_page_cache(). This
race condition is identical in nature to that which was addressed by
vm_pageout.c's revision 1.251 and vm_page.c's revision 1.275.
MFC after: 7 days
| -rw-r--r-- | sys/vm/vm_contig.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/vm/vm_contig.c b/sys/vm/vm_contig.c index fcdd45d..311a87a 100644 --- a/sys/vm/vm_contig.c +++ b/sys/vm/vm_contig.c @@ -105,6 +105,8 @@ vm_contig_launder(int queue) return (TRUE); } vm_page_test_dirty(m); + if (m->dirty == 0 && m->busy == 0 && m->hold_count == 0) + pmap_remove_all(m); if (m->dirty) { object = m->object; if (object->type == OBJT_VNODE) { |
