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 1C8151D90CD for ; Tue, 11 Feb 2025 09:51:53 +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=1739267514; cv=none; b=YF3LDWRXD54txB0Nh2CO+zZJAq7U7Oz7JeaCnhNdT4qbj9DF6/IhndmrUIn6zUpIC6v37ll5vjdmc1M0Gm56nh3Ej6gJ6SXxyVpVr5tChaE3dFg4kpEx88kv9kE4SV+FTc3cJvEKCTPut/svfAKlijy0B+T5TzykQzivg6SZwRE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739267514; c=relaxed/simple; bh=H4x9ljgQoiKY0hKQ2Dt8kn0PfGVyqL5v6Ld8akA9+6Q=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=YLnyNgL4xV+07guTj0tbAw/3cnynOkWBGk98mjNsKN7pNWGVfpY/O32Podkx97kH/Sc0BsMZCkOSL6qNEjXhXsdAXQVJf2fVAeOyzzg/HevprVBYu9lr1iEn4RZKJa8qS55noWX27nv6+ecQsz19wVhQRtdwvGr08J4KeX/waIE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bpsENeq+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bpsENeq+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5038C4CEDD; Tue, 11 Feb 2025 09:51:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739267513; bh=H4x9ljgQoiKY0hKQ2Dt8kn0PfGVyqL5v6Ld8akA9+6Q=; h=Subject:To:Cc:From:Date:From; b=bpsENeq+TCJMqRqaNp2l9giiZU4Ecl0qOzRZLCwHfhwK8sA4s2zcjIk150w/qY7Fd KLEQ6rdC3l4El8JSIFqlb8VXDnE17ZHan9iKfUHduIotIQSGn66x49w1SSyY0TAQ93 WwqY77b+0HobgtXQ2YohLs1XH6YBHdFAgcQyzils= Subject: FAILED: patch "[PATCH] RDMA/mlx5: Fix a race for an ODP MR which leads to CQE with" failed to apply to 6.6-stable tree To: yishaih@nvidia.com,artemyko@nvidia.com,jgg@nvidia.com,leonro@nvidia.com Cc: From: Date: Tue, 11 Feb 2025 10:51:49 +0100 Message-ID: <2025021149-mandarin-rethink-1770@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x abb604a1a9c87255c7a6f3b784410a9707baf467 # git commit -s git send-email --to '' --in-reply-to '2025021149-mandarin-rethink-1770@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From abb604a1a9c87255c7a6f3b784410a9707baf467 Mon Sep 17 00:00:00 2001 From: Yishai Hadas Date: Sun, 19 Jan 2025 14:38:25 +0200 Subject: [PATCH] RDMA/mlx5: Fix a race for an ODP MR which leads to CQE with error This patch addresses a race condition for an ODP MR that can result in a CQE with an error on the UMR QP. During the __mlx5_ib_dereg_mr() flow, the following sequence of calls occurs: mlx5_revoke_mr() mlx5r_umr_revoke_mr() mlx5r_umr_post_send_wait() At this point, the lkey is freed from the hardware's perspective. However, concurrently, mlx5_ib_invalidate_range() might be triggered by another task attempting to invalidate a range for the same freed lkey. This task will: - Acquire the umem_odp->umem_mutex lock. - Call mlx5r_umr_update_xlt() on the UMR QP. - Since the lkey has already been freed, this can lead to a CQE error, causing the UMR QP to enter an error state [1]. To resolve this race condition, the umem_odp->umem_mutex lock is now also acquired as part of the mlx5_revoke_mr() scope. Upon successful revoke, we set umem_odp->private which points to that MR to NULL, preventing any further invalidation attempts on its lkey. [1] From dmesg: infiniband rocep8s0f0: dump_cqe:277:(pid 0): WC error: 6, Message: memory bind operation error cqe_dump: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 cqe_dump: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 cqe_dump: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 cqe_dump: 00000030: 00 00 00 00 08 00 78 06 25 00 11 b9 00 0e dd d2 WARNING: CPU: 15 PID: 1506 at drivers/infiniband/hw/mlx5/umr.c:394 mlx5r_umr_post_send_wait+0x15a/0x2b0 [mlx5_ib] Modules linked in: ip6table_mangle ip6table_natip6table_filter ip6_tables iptable_mangle xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xt_addrtype iptable_nat nf_nat br_netfilter rpcsec_gss_krb5 auth_rpcgss oid_registry overlay rpcrdma rdma_ucm ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_umad ib_ipoib ib_cm mlx5_ib ib_uverbs ib_core fuse mlx5_core CPU: 15 UID: 0 PID: 1506 Comm: ibv_rc_pingpong Not tainted 6.12.0-rc7+ #1626 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:mlx5r_umr_post_send_wait+0x15a/0x2b0 [mlx5_ib] [..] Call Trace: mlx5r_umr_update_xlt+0x23c/0x3e0 [mlx5_ib] mlx5_ib_invalidate_range+0x2e1/0x330 [mlx5_ib] __mmu_notifier_invalidate_range_start+0x1e1/0x240 zap_page_range_single+0xf1/0x1a0 madvise_vma_behavior+0x677/0x6e0 do_madvise+0x1a2/0x4b0 __x64_sys_madvise+0x25/0x30 do_syscall_64+0x6b/0x140 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fixes: e6fb246ccafb ("RDMA/mlx5: Consolidate MR destruction to mlx5_ib_dereg_mr()") Cc: stable@vger.kernel.org Link: https://patch.msgid.link/r/68a1e007c25b2b8fe5d625f238cc3b63e5341f77.1737290229.git.leon@kernel.org Signed-off-by: Yishai Hadas Reviewed-by: Artemy Kovalyov Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index 45d9dc9c6c8f..bb02b6adbf2c 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -2021,6 +2021,11 @@ static int mlx5_revoke_mr(struct mlx5_ib_mr *mr) { struct mlx5_ib_dev *dev = to_mdev(mr->ibmr.device); struct mlx5_cache_ent *ent = mr->mmkey.cache_ent; + bool is_odp = is_odp_mr(mr); + int ret = 0; + + if (is_odp) + mutex_lock(&to_ib_umem_odp(mr->umem)->umem_mutex); if (mr->mmkey.cacheable && !mlx5r_umr_revoke_mr(mr) && !cache_ent_find_and_store(dev, mr)) { ent = mr->mmkey.cache_ent; @@ -2032,7 +2037,7 @@ static int mlx5_revoke_mr(struct mlx5_ib_mr *mr) ent->tmp_cleanup_scheduled = true; } spin_unlock_irq(&ent->mkeys_queue.lock); - return 0; + goto out; } if (ent) { @@ -2041,7 +2046,15 @@ static int mlx5_revoke_mr(struct mlx5_ib_mr *mr) mr->mmkey.cache_ent = NULL; spin_unlock_irq(&ent->mkeys_queue.lock); } - return destroy_mkey(dev, mr); + ret = destroy_mkey(dev, mr); +out: + if (is_odp) { + if (!ret) + to_ib_umem_odp(mr->umem)->private = NULL; + mutex_unlock(&to_ib_umem_odp(mr->umem)->umem_mutex); + } + + return ret; } static int __mlx5_ib_dereg_mr(struct ib_mr *ibmr) diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c index f2eb940bddc8..f655859eec00 100644 --- a/drivers/infiniband/hw/mlx5/odp.c +++ b/drivers/infiniband/hw/mlx5/odp.c @@ -268,6 +268,8 @@ static bool mlx5_ib_invalidate_range(struct mmu_interval_notifier *mni, if (!umem_odp->npages) goto out; mr = umem_odp->private; + if (!mr) + goto out; start = max_t(u64, ib_umem_start(umem_odp), range->start); end = min_t(u64, ib_umem_end(umem_odp), range->end);