From: Sun Ke <sunke32@huawei.com>
To: <josef@toxicpanda.com>, <axboe@kernel.dk>, <sunke32@huawei.com>,
<mchristi@redhat.com>
Cc: <linux-block@vger.kernel.org>, <nbd@other.debian.org>,
<linux-kernel@vger.kernel.org>
Subject: [v2] nbd: add a flush_workqueue in nbd_start_device
Date: Wed, 22 Jan 2020 11:18:57 +0800 [thread overview]
Message-ID: <20200122031857.5859-1-sunke32@huawei.com> (raw)
When kzalloc fail, may cause trying to destroy the
workqueue from inside the workqueue.
If num_connections is m (2 < m), and NO.1 ~ NO.n
(1 < n < m) kzalloc are successful. The NO.(n + 1)
failed. Then, nbd_start_device will return ENOMEM
to nbd_start_device_ioctl, and nbd_start_device_ioctl
will return immediately without running flush_workqueue.
However, we still have n recv threads. If nbd_release
run first, recv threads may have to drop the last
config_refs and try to destroy the workqueue from
inside the workqueue.
To fix it, add a flush_workqueue in nbd_start_device.
Fixes: e9e006f5fcf2 ("nbd: fix max number of supported devs")
Signed-off-by: Sun Ke <sunke32@huawei.com>
---
drivers/block/nbd.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index b4607dd96185..78181908f0df 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1265,6 +1265,16 @@ static int nbd_start_device(struct nbd_device *nbd)
args = kzalloc(sizeof(*args), GFP_KERNEL);
if (!args) {
sock_shutdown(nbd);
+ /*
+ * If num_connections is m (2 < m),
+ * and NO.1 ~ NO.n(1 < n < m) kzallocs are successful.
+ * But NO.(n + 1) failed. We still have n recv threads.
+ * So, add flush_workqueue here to prevent recv threads
+ * dropping the last config_refs and trying to destroy
+ * the workqueue from inside the workqueue.
+ */
+ if (i)
+ flush_workqueue(nbd->recv_workq);
return -ENOMEM;
}
sk_set_memalloc(config->socks[i]->sock->sk);
--
2.17.2
next reply other threads:[~2020-01-22 3:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 3:18 Sun Ke [this message]
2020-02-04 2:28 ` [v2] nbd: add a flush_workqueue in nbd_start_device sunke (E)
2020-02-04 2:41 ` Jens Axboe
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