The patch titled
Fix for shmem_truncate_range() BUG_ON()
has been added to the -mm tree. Its filename is
fix-for-shmem_truncate_range-bug_on.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Fix for shmem_truncate_range() BUG_ON()
From: Badari Pulavarty <pbadari@xxxxxxxxxx>
Ran into BUG() while doing madvise(REMOVE) testing. If we are punching a
hole into shared memory segment using madvise(REMOVE) and the entire hole
is below the indirect blocks, we hit following assert.
BUG_ON(limit <= SHMEM_NR_DIRECT);
Signed-off-by: Badari Pulavarty <pbadari@xxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/shmem.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletion(-)
diff -puN mm/shmem.c~fix-for-shmem_truncate_range-bug_on mm/shmem.c
--- a/mm/shmem.c~fix-for-shmem_truncate_range-bug_on
+++ a/mm/shmem.c
@@ -515,7 +515,12 @@ static void shmem_truncate_range(struct
size = SHMEM_NR_DIRECT;
nr_swaps_freed = shmem_free_swp(ptr+idx, ptr+size);
}
- if (!topdir)
+
+ /*
+ * If there are no indirect blocks or we are punching a hole
+ * below indirect blocks, nothing to be done.
+ */
+ if (!topdir || (punch_hole && (limit <= SHMEM_NR_DIRECT)))
goto done2;
BUG_ON(limit <= SHMEM_NR_DIRECT);
_
Patches currently in -mm which might be from pbadari@xxxxxxxxxx are
origin.patch
fix-for-shmem_truncate_range-bug_on.patch
-
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