From nobody Mon Sep 28 13:18:55 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) (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 A19C63002DD for ; Fri, 21 Aug 2026 08:48:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787302123; cv=none; b=tfnIwNRfL/YZZ9rzaX3xSKIBKjhTCeKzTv6B/zpSP9W7t5YETHy5s7LxUfKBHXp6IigLo6r4PNJJbLlSkhiSMW+040+ohDr8XSILo9C2F0155bclI/ZCLxsSy6RgGp0cS12t/iW8N5RZna0DDJyhFm8VZaedK2DeuLIVoAQ8sOA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787302123; c=relaxed/simple; bh=rhim4HA8+Uz16NQTn86fv0Bgxi32FjeJhcbnedz7RDI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=tRcTMuzwz5xbAYpGtvWAVjSVwTh26A6wnoabWrDfxkH/qvQtwLaAn8M2GlFRfDmn6Ye4K5T/33L/9KzX7LDa2lM/ZXO/g6IvVqIQJCzuUuUrRbjzbay+HFEq1YydgjKbtWUwk2n7uTHVY9d/uNrlkb8Qc+00KDcGiQkwZV+HUHY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=akiChfQi; arc=none smtp.client-ip=220.197.31.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="akiChfQi" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=am 8ByIVgCFcuQjzXTdOrv7ypCBvVUl908REwuB2AOhQ=; b=akiChfQietvmET89up oRjuayYD0zGbgCwktbdwZWkzPOsagQdzMtvLzx7AKtLn9gGvzGIq5ySTSKHQWm7w T5pSpKfrRb+zV33gmdde4X3QPOejrLN4HOr58rliiYCI4sOhkqjFb/2+iUeNULR6 PHIBEP2yuWwM2dFmFXiq3maX8= Received: from localhost.localdomain (unknown []) by gzga-smtp-mtada-g1-1 (Coremail) with SMTP id _____wC3y3+1EIhqsgs3QQ--.34633S2; Fri, 21 Aug 2026 16:47:50 +0800 (CST) From: oushixiong1025@163.com To: Matthew Brost Cc: Danilo Krummrich , Philipp Stanner , =?UTF-8?q?Christian=20K=C3=B6nig?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Shixiong Ou Subject: [PATCH] drm/sched: Guard against NULL dev in drm_sched_job trace event Date: Fri, 21 Aug 2026 16:47:48 +0800 Message-Id: <20260821084748.543645-1-oushixiong1025@163.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wC3y3+1EIhqsgs3QQ--.34633S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7WFy8ZrWfJF43JFyrWFy5CFg_yoW8Aw4xpr Zruay5Kry8tr47t3yUZ3WrWry5Ca1fZayxCr1DW3s3Zrn0vr15JF17Kw4fJrW7Ar4xAr92 g3Wq9a1aq3Wjgw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07Um1v-UUUUU= X-CM-SenderInfo: xrxvxxx0lr0wirqskqqrwthudrp/xtbC-Rbt-GqIELbsQAAA3S Content-Type: text/plain; charset="utf-8" From: Shixiong Ou The drm_sched_job trace event class calls dev_name() on sched_job->sched->dev without checking for NULL. Since the dev field in drm_sched_init_args is optional (used for debugging), a NULL dev causes a kernel oops when the trace event fires. The DRM scheduler KUnit tests do not set the dev field in drm_sched_init_args, leaving sched->dev as NULL. This causes a NULL pointer dereference when the drm_sched_job trace event fires during test execution, as dev_name(NULL) is called. Unable to handle kernel NULL pointer dereference at virtual address 00000= 00000000050 Call trace: trace_event_raw_event_drm_sched_job+0x90/0x258 __traceiter_drm_sched_job_queue+0x4c/0x78 drm_sched_entity_push_job+0x188/0x380 drm_sched_basic_entity_cleanup+0xfc/0x240 kunit_try_run_case+0x74/0x170 Signed-off-by: Shixiong Ou --- drivers/gpu/drm/scheduler/gpu_scheduler_trace.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h b/drivers/gpu/= drm/scheduler/gpu_scheduler_trace.h index 261713dd7d5a..319a3ec54bec 100644 --- a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h +++ b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h @@ -61,7 +61,8 @@ DECLARE_EVENT_CLASS(drm_sched_job, __string(name, sched_job->sched->name) __field(u32, job_count) __field(int, hw_job_count) - __string(dev, dev_name(sched_job->sched->dev)) + __string(dev, sched_job->sched->dev ? + dev_name(sched_job->sched->dev) : "none") __field(u64, fence_context) __field(u64, fence_seqno) __field(u64, client_id) --=20 2.25.1 No virus found Checked by Hillstone Network AntiVirus