From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 48DF33EEACB; Tue, 1 Sep 2026 14:04:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788271452; cv=none; b=ue5mOaUH/G/8MqHAoqwMWz7acjCYAoFJ696WYoZ1ECoYnZV3bvhkEgr1wv/2ZYa9Pl+5g6SPZ79zmzRzzmRMuyRUkrOeCgRCMgW1CquwdQt54Nh/gm35pdl2aP5o/0CCI3xMX+Sks8XwSdXlwxPDxLhHAtDtMbx2Q2CbvsfLjYk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788271452; c=relaxed/simple; bh=Xfv2jt4cOB8bmx9v7TXqvrTMEmyMl+0EWxhvEqFVwBk=; h=From:To:Cc:In-Reply-To:References:Subject:Message-Id:Date: MIME-Version:Content-Type; b=kXP6I7ThXggMM2XdPqy250vq6a7afuFaymvQmyzf80I0VdTBUddddubonUC0Mm8CcOrMKp9GOOTfkAnvknOuTLMp1/8s0TQqJZXFK3kU0ZF4NSnoK5WxSEjRp6R2LuFCW5Z1ne9oYuKdXBXmfvqER4yoK73KH7JEX+Jxg+5O7+M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ds0Xkq+i; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ds0Xkq+i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44FC71F000E9; Tue, 1 Sep 2026 14:04:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788271450; bh=FHZybySiaPe14dbMDMUulMa6M5fWVpsEsQ/tKYxAVJc=; h=From:To:Cc:In-Reply-To:References:Subject:Date; b=Ds0Xkq+iDyAQ8C7jxQx8gVXYNunKJg6MbnhXtCfOZ/379srL6K0LXUWFor1r43s/Z 1Z7dzVLbj8wkKeGwM9vWlnKiXRswoSr4PE7GBXhxHL056oznRRU+2gs8m0yKbdzolS vgtpZzBUHYvl+3ZFy27xa0i2tsBJWZPec0kpLhUQjFfh20oI85RNlRPC3GQEbW/h9s q17oo5pEjUZ0hLNXKpumfqiCH98dgSRfq+9CaTMK68YvkU+IjIlDF4p7KJ2XmLBnES L1PVOEFuq913Vz+Xg/0F6S0BDIACI60Kq3fWyId3T2l+PlllhypSAzsNu/H3Xj/Mzo nBeV1RXapTOTw== From: Leon Romanovsky To: Jason Gunthorpe , Junxian Huang , Chengchang Tang , Edward Srouji Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Or Har-Toov In-Reply-To: <20260811-fix-mmap-lockdep-v1-1-1151b41063b4@nvidia.com> References: <20260811-fix-mmap-lockdep-v1-1-1151b41063b4@nvidia.com> Subject: Re: [PATCH rdma-next] RDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency Message-Id: <178827144803.1380198.18045973124694867362.b4-ty@kernel.org> Date: Tue, 01 Sep 2026 10:04:08 -0400 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.15-dev-18f8f On Tue, 11 Aug 2026 19:19:16 +0300, Edward Srouji wrote: > Commit 51976c6cd786 ("RDMA/core: Provide rdma_user_mmap_disassociate() > to disassociate mmap pages") introduced disassociation_lock to protect > new mmap registrations against uverbs_user_mmap_disassociate(), but > created an ABBA deadlock: > > Thread A (mmap / fork): > mmap_lock -> disassociation_lock > > [...] Applied, thanks! [1/1] RDMA/uverbs: Fix mmap_lock/disassociation_lock circular dependency https://git.kernel.org/rdma/rdma/c/a44a3f175eaee7 Best regards, -- Leon Romanovsky