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Message-ID: <20230411122651.GV182481@unreal>
Date: Tue, 11 Apr 2023 15:26:51 +0300
From: Leon Romanovsky <leon@...nel.org>
To: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
Cc: Guoqing Jiang <guoqing.jiang@...ux.dev>,
"haris.iqbal@...os.com" <haris.iqbal@...os.com>,
"jinpu.wang@...os.com" <jinpu.wang@...os.com>,
"jgg@...pe.ca" <jgg@...pe.ca>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH for-next 2/3] RDMA/rtrs: Fix rxe_dealloc_pd warning
On Tue, Apr 11, 2023 at 02:43:46AM +0000, Zhijian Li (Fujitsu) wrote:
>
>
> On 10/04/2023 21:10, Guoqing Jiang wrote:
> >
> >
> > On 4/10/23 20:08, Leon Romanovsky wrote:
> >> On Mon, Apr 10, 2023 at 06:43:03AM +0000, Li Zhijian wrote:
> >>> The warning occurs when destroying PD whose reference count is not zero.
> >>>
> >>> Precodition: clt_path->s.con_num is 2.
> >>> So 2 cm connection will be created as below:
> >>> CPU0 CPU1
> >>> init_conns { |
> >>> create_cm() // a. con[0] created |
> >>> | a'. rtrs_clt_rdma_cm_handler() {
> >>> | rtrs_rdma_addr_resolved()
> >>> | create_con_cq_qp(con); << con[0]
> >>> | }
> >>> | in this moment, refcnt of PD was increased to 2+
> >>> |
> >>> create_cm() // b. cid = 1, failed |
> >>> destroy_con_cq_qp() |
> >>> rtrs_ib_dev_put() |
> >>> dev_free() |
> >>> ib_dealloc_pd(dev->ib_pd) << PD |
> >>> is destroyed, but refcnt is |
> >>> still greater than 0 |
> >>> }
> >>>
> >>> Simply, Here we can avoid this warning by introducing conn own flag to
> >>> track if its cleanup should drop the PD.
> >>>
> >>> -----------------------------------------------
> >>> rnbd_client L597: Mapping device /dev/nvme0n1 on session client, (access_mode: rw, nr_poll_queues: 0)
> >>> ------------[ cut here ]------------
> >>> WARNING: CPU: 0 PID: 26407 at drivers/infiniband/sw/rxe/rxe_pool.c:256 __rxe_cleanup+0x13a/0x170 [rdma_rxe]
> >>> Modules linked in: rpcrdma rdma_ucm ib_iser rnbd_client libiscsi rtrs_client scsi_transport_iscsi rtrs_core rdma_cm iw_cm ib_cm crc32_generic rdma_rxe udp_tunnel ib_uverbs ib_core kmem device_dax nd_pmem dax_pmem nd_
> >>> vme crc32c_intel fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua dm_mirror dm_region_hash dm_log dm_mod
> >>> CPU: 0 PID: 26407 Comm: rnbd-client.sh Kdump: loaded Not tainted 6.2.0-rc6-roce-flush+ #53
> >>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
> >>> RIP: 0010:__rxe_cleanup+0x13a/0x170 [rdma_rxe]
> >>> Code: 45 84 e4 0f 84 5a ff ff ff 48 89 ef e8 5f 18 71 f9 84 c0 75 90 be c8 00 00 00 48 89 ef e8 be 89 1f fa 85 c0 0f 85 7b ff ff ff <0f> 0b 41 bc ea ff ff ff e9 71 ff ff ff e8 84 7f 1f fa e9 d0 fe ff
> >>> RSP: 0018:ffffb09880b6f5f0 EFLAGS: 00010246
> >>> RAX: 0000000000000000 RBX: ffff99401f15d6a8 RCX: 0000000000000000
> >>> RDX: 0000000000000001 RSI: ffffffffbac8234b RDI: 00000000ffffffff
> >>> RBP: ffff99401f15d6d0 R08: 0000000000000001 R09: 0000000000000001
> >>> R10: 0000000000002d82 R11: 0000000000000000 R12: 0000000000000001
> >>> R13: ffff994101eff208 R14: ffffb09880b6f6a0 R15: 00000000fffffe00
> >>> FS: 00007fe113904740(0000) GS:ffff99413bc00000(0000) knlGS:0000000000000000
> >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >>> CR2: 00007ff6cde656c8 CR3: 000000001f108004 CR4: 00000000001706f0
> >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> >>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> >>> Call Trace:
> >>> <TASK>
> >>> rxe_dealloc_pd+0x16/0x20 [rdma_rxe]
> >>> ib_dealloc_pd_user+0x4b/0x80 [ib_core]
> >>> rtrs_ib_dev_put+0x79/0xd0 [rtrs_core]
> >>> destroy_con_cq_qp+0x8a/0xa0 [rtrs_client]
> >>> init_path+0x1e7/0x9a0 [rtrs_client]
> >>> ? __pfx_autoremove_wake_function+0x10/0x10
> >>> ? lock_is_held_type+0xd7/0x130
> >>> ? rcu_read_lock_sched_held+0x43/0x80
> >>> ? pcpu_alloc+0x3dd/0x7d0
> >>> ? rtrs_clt_init_stats+0x18/0x40 [rtrs_client]
> >>> rtrs_clt_open+0x24f/0x5a0 [rtrs_client]
> >>> ? __pfx_rnbd_clt_link_ev+0x10/0x10 [rnbd_client]
> >>> rnbd_clt_map_device+0x6a5/0xe10 [rnbd_client]
> >>>
> >>> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
> >>> ---
> >>> drivers/infiniband/ulp/rtrs/rtrs-clt.c | 4 ++++
> >>> drivers/infiniband/ulp/rtrs/rtrs-clt.h | 1 +
> >>> 2 files changed, 5 insertions(+)
> >>>
> >>> diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> >>> index c2065fc33a56..4c8f42e46e2f 100644
> >>> --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> >>> +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
> >>> @@ -1664,6 +1664,7 @@ static int create_con_cq_qp(struct rtrs_clt_con *con)
> >>> return -ENOMEM;
> >>> }
> >>> clt_path->s.dev_ref = 1;
> >>> + con->has_dev = true;
> >>> query_fast_reg_mode(clt_path);
> >>> wr_limit = clt_path->s.dev->ib_dev->attrs.max_qp_wr;
> >>> /*
> >>> @@ -1690,6 +1691,7 @@ static int create_con_cq_qp(struct rtrs_clt_con *con)
> >>> wr_limit = clt_path->s.dev->ib_dev->attrs.max_qp_wr;
> >>> /* Shared between connections */
> >>> clt_path->s.dev_ref++;
> >> Without looking in the code, I would expect dev_ref from the line above
> >> to perform PD protection.
> >
> > Agreed.
>
> Sorry, i didn't get your point. Do you mean something like this:
>
> + con->has_dev = true;
> clt_path->s.dev_ref++;
No, my point was that clt_path->s.dev_ref > 0 means that has_dev is
equal to true, and dev_ref is supposed to protect from early PD
destruction.
Thanks
>
>
>
> Thanks
> Zhijian
>
> >
> > Thanks,
> > Guoqing
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