From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFFA7263F36; Tue, 18 Feb 2025 13:58:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739887089; cv=none; b=SE4d/A5j8/2IKzOIp84I/pAdaZSzv8EliFhL+2NzZjFmdQpt+/r61UzgY9FEHYW73fXfHm6/RR3tm9K5Puk0puEuj91KKMD17Q2MsL4RD97mfmjjqKp/dXyMjRwZSgX/YI02628UPJ+MzCqoVA2k3gr506K+w8OFxbV+v9gWBFM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739887089; c=relaxed/simple; bh=05ioUIZ9eW4C3n+2uobzEo+SsGZXGW2MZGvEd6nxZZE=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=qgbrVpxsPd/hNWAA7RIsSLYimhVpxETXw8+UqZR01BWdmP0Sq6Wt/eRJgeo+4pTeCGp6JXyaC+0Gg+j/npId9o+SStF5pOtdnh9e+k9AvT82H5c5gXBSAGy+zmvELA4a5ujIR3b0zkrcC9oj/hTOtuYiKO987G9m7CK6iezWMMU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PPfEaT4Z; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PPfEaT4Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B06E1C4CEE2; Tue, 18 Feb 2025 13:58:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739887088; bh=05ioUIZ9eW4C3n+2uobzEo+SsGZXGW2MZGvEd6nxZZE=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=PPfEaT4Zu7LUI4aSqwJM23lA41HB6nMLrsFKV2spFq6OFRTH1vLAQppi2Byzh6agj xk/vQEhDUHGCVuj4BUG90L+aKlKyYmL2VAMGRmYT4pH8I99wTFscXus7ZW7HovX48m JDwA/ikKLM6QCpI3oDmgF47XBFX0kQRPw2+Zfnjc0LJZcw7VdzN1grP3m6ZzfAq1bg k5ODh1IcwUQ2QHSaqRYMfEQpchZIHsY1EIFhJHS1RzGy8JYx/iA0/KQ74HU8TBhnJk kfb5FcIBrsbiJayBZqklxc+rui8EQyNo4Z2imXghw2AXEY2m/FevjbR+S/5KmiMP1r IzbKT9tK9Khig== Message-ID: <0ae8a05272c2eb8a503102788341e1d9c49109dd.camel@kernel.org> Subject: Re: [PATCH] nfsd: decrease cl_cb_inflight if fail to queue cb_work From: Jeff Layton To: Li Lingfeng , chuck.lever@oracle.com, neilb@suse.de, okorniev@redhat.com, Dai.Ngo@oracle.com, tom@talpey.com, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Cc: yukuai1@huaweicloud.com, houtao1@huawei.com, yi.zhang@huawei.com, yangerkun@huawei.com, lilingfeng@huaweicloud.com Date: Tue, 18 Feb 2025 08:58:06 -0500 In-Reply-To: <20250218135423.1487309-1-lilingfeng3@huawei.com> References: <20250218135423.1487309-1-lilingfeng3@huawei.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-02-18 at 21:54 +0800, Li Lingfeng wrote: > In nfsd4_run_cb, cl_cb_inflight is increased before attempting to queue > cb_work to callback_wq. This count can be decreased in three situations: > 1) If queuing fails in nfsd4_run_cb, the count will be decremented > accordingly. > 2) After cb_work is running, the count is decreased in the exception > branch of nfsd4_run_cb_work via nfsd41_destroy_cb. > 3) The count is decreased in the release callback of rpc_task =E2=80=94 e= ither > directly calling nfsd41_cb_inflight_end in nfsd4_cb_probe_release, or > calling nfsd41_destroy_cb in nfsd4_cb_release. >=20 > However, in nfsd4_cb_release, if the current cb_work needs to restart, th= e > count will not be decreased, with the expectation that it will be reduced > once cb_work is running. > If queuing fails here, then the count will leak, ultimately causing the > nfsd service to be unable to exit as shown below: > [root@nfs_test2 ~]# cat /proc/2271/stack > [<0>] nfsd4_shutdown_callback+0x22b/0x290 > [<0>] __destroy_client+0x3cd/0x5c0 > [<0>] nfs4_state_destroy_net+0xd2/0x330 > [<0>] nfs4_state_shutdown_net+0x2ad/0x410 > [<0>] nfsd_shutdown_net+0xb7/0x250 > [<0>] nfsd_last_thread+0x15f/0x2a0 > [<0>] nfsd_svc+0x388/0x3f0 > [<0>] write_threads+0x17e/0x2b0 > [<0>] nfsctl_transaction_write+0x91/0xf0 > [<0>] vfs_write+0x1c4/0x750 > [<0>] ksys_write+0xcb/0x170 > [<0>] do_syscall_64+0x70/0x120 > [<0>] entry_SYSCALL_64_after_hwframe+0x78/0xe2 > [root@nfs_test2 ~]# >=20 > Fix this by decreasing cl_cb_inflight if the restart fails. >=20 > Fixes: cba5f62b1830 ("nfsd: fix callback restarts") > Signed-off-by: Li Lingfeng > --- > fs/nfsd/nfs4callback.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) >=20 > diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c > index 484077200c5d..8a7d24efdd08 100644 > --- a/fs/nfsd/nfs4callback.c > +++ b/fs/nfsd/nfs4callback.c > @@ -1459,12 +1459,16 @@ static void nfsd4_cb_done(struct rpc_task *task, = void *calldata) > static void nfsd4_cb_release(void *calldata) > { > struct nfsd4_callback *cb =3D calldata; > + struct nfs4_client *clp =3D cb->cb_clp; > + int queued; > =20 > trace_nfsd_cb_rpc_release(cb->cb_clp); > =20 > - if (cb->cb_need_restart) > - nfsd4_queue_cb(cb); > - else > + if (cb->cb_need_restart) { > + queued =3D nfsd4_queue_cb(cb); > + if (!queued) > + nfsd41_cb_inflight_end(clp); > + } else > nfsd41_destroy_cb(cb); > =20 > } Good catch! Reviewed-by: Jeff Layton