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@xxxxxxxxxxx> --- 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. Thanks, Guoqing
