Yesterday's mmotm hangs at startup, and with lockdep it reports:
BUG: spinlock recursion on CPU#1, blkid/284 - with bdi_lock_two()
called from bdev_inode_switch_bdi() in the backtrace. It appears
that this function is sometimes called with new the same as old.
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
Fix to
writeback-split-inode_wb_list_lock-into-bdi_writebacklist_lock.patch
fs/block_dev.c | 2 ++
1 file changed, 2 insertions(+)
--- 2.6.39-rc5-mm1/fs/block_dev.c 2011-04-29 18:20:09.183314733 -0700
+++ linux/fs/block_dev.c 2011-04-30 17:55:45.718785263 -0700
@@ -57,6 +57,8 @@ static void bdev_inode_switch_bdi(struct
{
struct backing_dev_info *old = inode->i_data.backing_dev_info;
+ if (dst == old)
+ return;
bdi_lock_two(&old->wb, &dst->wb);
spin_lock(&inode->i_lock);
inode->i_data.backing_dev_info = dst;
--
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