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Date:	Thu, 23 Jun 2011 12:02:11 -0400
From:	Valdis.Kletnieks@...edu
To:	Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
	stable@...nel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jeff Garzik <jgarzik@...ox.com>,
	IngIngo Molnar <mingo@...hat.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: mmotm 2011-06-22 - inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.

On Thu, 23 Jun 2011 17:38:36 +0200, Peter Zijlstra said:
> On Wed, 2011-06-22 at 21:59 -0400, Valdis.Kletnieks@...edu wrote:
> > [   20.254275] {SOFTIRQ-ON-W} state was registered at:
> > [   20.254275]   [<ffffffff8106973b>] mark_irqflags+0xf2/0x13e
> > [   20.254275]   [<ffffffff810699b2>] __lock_acquire+0x22b/0x3e2
> > [   20.254275]   [<ffffffff8106a09f>] lock_acquire+0x103/0x153
> > [   20.254275]   [<ffffffff8157bb01>] _raw_spin_lock+0x36/0x45
> > [   20.254275]   [<ffffffff8110ddf8>] end_writeback+0x33/0x103
> > [   20.254275]   [<ffffffff81125425>] bdev_evict_inode+0x3e/0xbe
> > [   20.254275]   [<ffffffff8110df78>] evict+0xb0/0x173
> > [   20.254275]   [<ffffffff8110e1ea>] iput_final+0x171/0x17a
> > [   20.254275]   [<ffffffff8110e241>] iput+0x4e/0x53
> > [   20.254275]   [<ffffffff81125cad>] __blkdev_put+0x1c0/0x1eb
> > [   20.254275]   [<ffffffff81125ebe>] blkdev_put+0x1e6/0x1f5
> > [   20.254275]   [<ffffffff8121d143>] register_disk+0xea/0x13c
> > [   20.254275]   [<ffffffff8121d2c4>] add_disk+0x12f/0x1a4
> > [   20.254275]   [<ffffffff812ef339>] sd_probe_async+0x115/0x1b5
> > [   20.254275]   [<ffffffff8105ce2f>] async_run_entry_fn+0x99/0x12a
> > [   20.254275]   [<ffffffff810505e8>] process_one_work+0x25d/0x467
> > [   20.254275]   [<ffffffff81051ddb>] worker_thread+0x152/0x206
> > [   20.254275]   [<ffffffff810561fa>] kthread+0x7f/0x87
> > [   20.254275]   [<ffffffff815835d4>] kernel_thread_helper+0x4/0x10=20
> 
> That looks broken. Not having -mm, is there a git tree some place?, I
> cannot quite see how end_writeback() is taking mapping->tree_lock as my
> version looks like:
> 
> void end_writeback(struct inode *inode)
> {
> 	might_sleep();
> 	BUG_ON(inode->i_data.nrpages);
> 	BUG_ON(!list_empty(&inode->i_data.private_list));

mm-fix-assertion-mapping-nrpages-==-0-in-end_writeback.patch does this:

diff -puN fs/inode.c~mm-fix-assertion-mapping-nrpages-==-0-in-end_writeback fs/inode.c
--- a/fs/inode.c~mm-fix-assertion-mapping-nrpages-==-0-in-end_writeback
+++ a/fs/inode.c
@@ -423,7 +423,14 @@ EXPORT_SYMBOL(remove_inode_hash);
 void end_writeback(struct inode *inode)
 {
        might_sleep();
+       /*
+        * We have to cycle tree_lock here because reclaim can be still in the
+        * process of removing the last page (in __delete_from_page_cache())
+        * and we must not free mapping under it.
+        */
+       spin_lock(&inode->i_data.tree_lock);
        BUG_ON(inode->i_data.nrpages);
+       spin_unlock(&inode->i_data.tree_lock);
        BUG_ON(!list_empty(&inode->i_data.private_list));
        BUG_ON(!(inode->i_state & I_FREEING));
        BUG_ON(inode->i_state & I_CLEAR);

Adding Jan Kara to the list, and stable@...nel.org because the patch was cc'ed to there...


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