linux-kernel - Re: [PATCH] fscache: check consistency does not decrement refcount

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Date:	Tue, 10 Sep 2013 09:48:38 -0700 (PDT)
From:	Sage Weil <sage@...tank.com>
To:	Milosz Tanski <milosz@...in.com>
cc:	ceph-devel <ceph-devel@...r.kernel.org>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	"linux-cachefs@...hat.com" <linux-cachefs@...hat.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] fscache: check consistency does not decrement refcount

On Tue, 10 Sep 2013, Milosz Tanski wrote:
> Sage,
> 
> Can you submit to the upstream next in your next round of fixes (with
> David's ack).

Yep; it's in the queue.  Thanks!

sage

> 
> Thanks,
> - Milosz
> 
> P.S: Thanks David.
> 
> On Tue, Sep 10, 2013 at 8:34 AM, David Howells <dhowells@...hat.com> wrote:
> > Milosz Tanski <milosz@...in.com> wrote:
> >
> >> __fscache_check_consistency() does not decrement the count of operations
> >> active after it finishes in the success case. This leads to a hung tasks on
> >> cookie de-registration (commonly in inode eviction).
> >>
> >> INFO: task kworker/1:2:4214 blocked for more than 120 seconds.
> >> kworker/1:2     D ffff880443513fc0     0  4214      2 0x00000000
> >> Workqueue: ceph-msgr con_work [libceph]
> >>   ...
> >> Call Trace:
> >>  [<ffffffff81569fc6>] ? _raw_spin_unlock_irqrestore+0x16/0x20
> >>  [<ffffffffa0016570>] ? fscache_wait_bit_interruptible+0x30/0x30 [fscache]
> >>  [<ffffffff81568d09>] schedule+0x29/0x70
> >>  [<ffffffffa001657e>] fscache_wait_atomic_t+0xe/0x20 [fscache]
> >>  [<ffffffff815665cf>] out_of_line_wait_on_atomic_t+0x9f/0xe0
> >>  [<ffffffff81083560>] ? autoremove_wake_function+0x40/0x40
> >>  [<ffffffffa0015a9c>] __fscache_relinquish_cookie+0x15c/0x310 [fscache]
> >>  [<ffffffffa00a4fae>] ceph_fscache_unregister_inode_cookie+0x3e/0x50 [ceph]
> >>  [<ffffffffa007e373>] ceph_destroy_inode+0x33/0x200 [ceph]
> >>  [<ffffffff811c13ae>] ? __fsnotify_inode_delete+0xe/0x10
> >>  [<ffffffff8119ba1c>] destroy_inode+0x3c/0x70
> >>  [<ffffffff8119bb69>] evict+0x119/0x1b0
> >>
> >> Signed-off-by: Milosz Tanski <milosz@...in.com>
> >
> > Acked-by: David Howells <dhowells@...hat.com>
> --
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