On 05/07/2012 06:46 PM, Helmut Hullen wrote:
> btrfs: error reading free space cache
> BUG: unable to handle kernel NULL pointer dereference at 00000001
> IP: [<c1295c36>] io_ctl_drop_pages+0x26/0x50
> *pdpt = 0000000029712001 *pde = 0000000000000000
> Oops: 0002 [#1]
Could you please try this and show us the results?
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 202008e..ae514ad 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -296,7 +296,9 @@ static void io_ctl_free(struct io_ctl *io_ctl)
static void io_ctl_unmap_page(struct io_ctl *io_ctl)
{
if (io_ctl->cur) {
- kunmap(io_ctl->page);
+ WARN_ON(!io_ctl->page);
+ if (io_ctl->page)
+ kunmap(io_ctl->page);
io_ctl->cur = NULL;
io_ctl->orig = NULL;
}
--
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