On Wed, May 26 2010, Christoph Hellwig wrote:
> On Wed, May 26, 2010 at 01:21:25PM +0200, Jens Axboe wrote:
> > Not good, can you see if reverting 7c8a3554 makes it go away?
>
> Reverting back to the revision before 7c8a3554 gives me lots of warnings ala:
>
> [ 178.253431] ------------[ cut here ]------------
> [ 178.256845] WARNING: at
> /home/hch/work/linux-2.6/fs/fs-writeback.c:596
> writeback_inodes_wb+0x423/0x440()
> [ 178.259995] Hardware name: Bochs
> [ 178.261270] Modules linked in:
> [ 178.262508] Pid: 2298, comm: flush-253:16 Tainted: G W
> 2.6.34-rc5 #121
> [ 178.265199] Call Trace:
> [ 178.266210] [<c08d86ca>] ? printk+0x18/0x1a
> [ 178.267597] [<c0162d0d>] warn_slowpath_common+0x6d/0xa0
> [ 178.269296] [<c0216ff3>] ? writeback_inodes_wb+0x423/0x440
> [ 178.271348] [<c0216ff3>] ? writeback_inodes_wb+0x423/0x440
> [ 178.273121] [<c0162d55>] warn_slowpath_null+0x15/0x20
> [ 178.274681] [<c0216ff3>] writeback_inodes_wb+0x423/0x440
> [ 178.276390] [<c0217111>] wb_writeback+0x101/0x1b0
> [ 178.277846] [<c01a9a79>] ? __call_rcu+0x99/0x130
> [ 178.279287] [<c01a9b38>] ? call_rcu+0x8/0x10
> [ 178.281110] [<c02161fa>] ? wb_clear_pending+0x7a/0xa0
> [ 178.282673] [<c021728f>] wb_do_writeback+0xcf/0x1a0
> [ 178.284239] [<c02171e0>] ? wb_do_writeback+0x20/0x1a0
> [ 178.285823] [<c021738a>] bdi_writeback_task+0x2a/0x90
> [ 178.287371] [<c01dca90>] ? bdi_start_fn+0x0/0xb0
> [ 178.288992] [<c01dcae8>] bdi_start_fn+0x58/0xb0
> [ 178.290823] [<c01dca90>] ? bdi_start_fn+0x0/0xb0
> [ 178.292378] [<c017dc7c>] kthread+0x6c/0x80
> [ 178.293711] [<c017dc10>] ? kthread+0x0/0x80
> [ 178.295073] [<c013023a>] kernel_thread_helper+0x6/0x1c
> [ 178.296753] ---[ end trace a7919e7f17c0a80f ]---
Oops yes, you need to revert the parent too. But nevermind, I think I
see the issue. Can you try the below (go back to -git again)?
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index ea8592b..5e6cc61 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -121,6 +121,7 @@ static void bdi_work_free(struct rcu_head *head)
static void wb_work_complete(struct bdi_work *work)
{
const enum writeback_sync_modes sync_mode = work->args.sync_mode;
+ const int caller_frees = work->args.sb_pinned;
int onstack = bdi_work_on_stack(work);
/*
@@ -131,7 +132,7 @@ static void wb_work_complete(struct bdi_work *work)
*/
if (!onstack)
bdi_work_clear(work);
- if (sync_mode == WB_SYNC_NONE || onstack)
+ if ((sync_mode == WB_SYNC_NONE && caller_frees) || onstack)
call_rcu(&work->rcu_head, bdi_work_free);
}
@@ -206,8 +207,10 @@ static void bdi_alloc_queue_work(struct backing_dev_info *bdi,
if (work) {
bdi_work_init(work, args);
bdi_queue_work(bdi, work);
- if (wait)
+ if (wait) {
bdi_wait_on_work_clear(work);
+ kfree(work);
+ }
} else {
struct bdi_writeback *wb = &bdi->wb;
--
Jens Axboe
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