From patchwork Mon May 10 10:20:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 434071 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD05BC433ED for ; Mon, 10 May 2021 10:35:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DA0161999 for ; Mon, 10 May 2021 10:35:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232217AbhEJKgy (ORCPT ); Mon, 10 May 2021 06:36:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:40904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232776AbhEJKfG (ORCPT ); Mon, 10 May 2021 06:35:06 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 375F861139; Mon, 10 May 2021 10:28:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620642494; bh=AAcA8OdPJl+ilu/dPnGtwVxONE61/5EAHLfi0bMQ3Q8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gujU750tjCS91vr2/hOWlEG3DAlzXBgb0+C2TFPFv5kHGO/gUfPGGT0qW0DHAW+hC cG0W3zsjobHLH+zpIfuYekgYUb+cCAFGTf9L1772OpjJMVahZB48fUQjL3vDlJR7TB 0KlUxOGEldf8f5Ym9Sh2lI+JtcApaGPdXIUmr5E0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Qu Huang , Alex Deucher , Sasha Levin Subject: [PATCH 5.4 116/184] drm/amdkfd: Fix cat debugfs hang_hws file causes system crash bug Date: Mon, 10 May 2021 12:20:10 +0200 Message-Id: <20210510101953.986835104@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510101950.200777181@linuxfoundation.org> References: <20210510101950.200777181@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Qu Huang [ Upstream commit d73610211eec8aa027850982b1a48980aa1bc96e ] Here is the system crash log: [ 1272.884438] BUG: unable to handle kernel NULL pointer dereference at (null) [ 1272.884444] IP: [< (null)>] (null) [ 1272.884447] PGD 825b09067 PUD 8267c8067 PMD 0 [ 1272.884452] Oops: 0010 [#1] SMP [ 1272.884509] CPU: 13 PID: 3485 Comm: cat Kdump: loaded Tainted: G [ 1272.884515] task: ffff9a38dbd4d140 ti: ffff9a37cd3b8000 task.ti: ffff9a37cd3b8000 [ 1272.884517] RIP: 0010:[<0000000000000000>] [< (null)>] (null) [ 1272.884520] RSP: 0018:ffff9a37cd3bbe68 EFLAGS: 00010203 [ 1272.884522] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000014d5f [ 1272.884524] RDX: fffffffffffffff4 RSI: 0000000000000001 RDI: ffff9a38aca4d200 [ 1272.884526] RBP: ffff9a37cd3bbed0 R08: ffff9a38dcd5f1a0 R09: ffff9a31ffc07300 [ 1272.884527] R10: ffff9a31ffc07300 R11: ffffffffaddd5e9d R12: ffff9a38b4e0fb00 [ 1272.884529] R13: 0000000000000001 R14: ffff9a37cd3bbf18 R15: ffff9a38aca4d200 [ 1272.884532] FS: 00007feccaa67740(0000) GS:ffff9a38dcd40000(0000) knlGS:0000000000000000 [ 1272.884534] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1272.884536] CR2: 0000000000000000 CR3: 00000008267c0000 CR4: 00000000003407e0 [ 1272.884537] Call Trace: [ 1272.884544] [] ? seq_read+0x130/0x440 [ 1272.884548] [] vfs_read+0x9f/0x170 [ 1272.884552] [] SyS_read+0x7f/0xf0 [ 1272.884557] [] system_call_fastpath+0x22/0x27 [ 1272.884558] Code: Bad RIP value. [ 1272.884562] RIP [< (null)>] (null) [ 1272.884564] RSP [ 1272.884566] CR2: 0000000000000000 Signed-off-by: Qu Huang Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c b/drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c index 511712c2e382..673d5e34f213 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c @@ -33,6 +33,11 @@ static int kfd_debugfs_open(struct inode *inode, struct file *file) return single_open(file, show, NULL); } +static int kfd_debugfs_hang_hws_read(struct seq_file *m, void *data) +{ + seq_printf(m, "echo gpu_id > hang_hws\n"); + return 0; +} static ssize_t kfd_debugfs_hang_hws_write(struct file *file, const char __user *user_buf, size_t size, loff_t *ppos) @@ -94,7 +99,7 @@ void kfd_debugfs_init(void) debugfs_create_file("rls", S_IFREG | 0444, debugfs_root, kfd_debugfs_rls_by_device, &kfd_debugfs_fops); debugfs_create_file("hang_hws", S_IFREG | 0200, debugfs_root, - NULL, &kfd_debugfs_hang_hws_fops); + kfd_debugfs_hang_hws_read, &kfd_debugfs_hang_hws_fops); } void kfd_debugfs_fini(void)