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 E400023D2AE; Mon, 2 Jun 2025 14:13:17 +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=1748873598; cv=none; b=Sx/fZ0gAEoOmMQb/9BzkrregNyhDpAl5NHr2JWPPDiVkm9MLTqzyGE0x6lWKROe21Q63aMJHaQNBzfX3CmrHtuV5gcap6kyUiE1D0Tmik7Zy6kRV0J5yL72mw8daGsj7x4wHOD59P1vFfwfo+CmyNL1ei13HxVaEgeItXRs2qZk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748873598; c=relaxed/simple; bh=vCbI+cjAV40fLqr/0YITuKS1NjAnwhUX/IZZ40MX6ec=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=P8A4peTIemdITLMNKtxvAhzxDyEx72T/1iPTaAckEVbnPiJhVOCpS4s3aXJi9+dBFQHvrVJy+RhzEvnZTsh0eHOPclZDBLGDQKZ+UvsVnXoQtI8wHDMnnp4d/svEDlJqGLStA0hcYCSEX/IGy5lpJs0Ac+GpHE/YI4pZkPx6raw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qEnOyCnA; 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="qEnOyCnA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50A97C4CEEB; Mon, 2 Jun 2025 14:13:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1748873597; bh=vCbI+cjAV40fLqr/0YITuKS1NjAnwhUX/IZZ40MX6ec=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qEnOyCnAfS8Dh30jQTdaO+ra1kzMxcprH2qmL8MwIUvldqT5J5ZjN5WX00/eyysi1 xmA+7xO+INVHJdjxyBnKteAbr2ndvhsQbPOjJo2H9VcmGmdvbSqcnfxDBaOLn3mMPc fjCl8sUHqwEMbmEhbc4ZDzbzMXQUI9OyyDOu3qOE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Philip Yang , Felix Kuehling , Alex Deucher , Sasha Levin Subject: [PATCH 6.6 174/444] drm/amdkfd: KFD release_work possible circular locking Date: Mon, 2 Jun 2025 15:43:58 +0200 Message-ID: <20250602134347.958260835@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250602134340.906731340@linuxfoundation.org> References: <20250602134340.906731340@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Philip Yang [ Upstream commit 1b9366c601039d60546794c63fbb83ce8e53b978 ] If waiting for gpu reset done in KFD release_work, thers is WARNING: possible circular locking dependency detected #2 kfd_create_process kfd_process_mutex flush kfd release work #1 kfd release work wait for amdgpu reset work #0 amdgpu_device_gpu_reset kgd2kfd_pre_reset kfd_process_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((work_completion)(&p->release_work)); lock((wq_completion)kfd_process_wq); lock((work_completion)(&p->release_work)); lock((wq_completion)amdgpu-reset-dev); To fix this, KFD create process move flush release work outside kfd_process_mutex. Signed-off-by: Philip Yang Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdkfd/kfd_process.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index a6d08dee74f6e..93740b8fc3f44 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -812,6 +812,14 @@ struct kfd_process *kfd_create_process(struct task_struct *thread) return ERR_PTR(-EINVAL); } + /* If the process just called exec(3), it is possible that the + * cleanup of the kfd_process (following the release of the mm + * of the old process image) is still in the cleanup work queue. + * Make sure to drain any job before trying to recreate any + * resource for this process. + */ + flush_workqueue(kfd_process_wq); + /* * take kfd processes mutex before starting of process creation * so there won't be a case where two threads of the same process @@ -830,14 +838,6 @@ struct kfd_process *kfd_create_process(struct task_struct *thread) if (process) { pr_debug("Process already found\n"); } else { - /* If the process just called exec(3), it is possible that the - * cleanup of the kfd_process (following the release of the mm - * of the old process image) is still in the cleanup work queue. - * Make sure to drain any job before trying to recreate any - * resource for this process. - */ - flush_workqueue(kfd_process_wq); - process = create_process(thread); if (IS_ERR(process)) goto out; -- 2.39.5