From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [148.163.129.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE6F12367AC; Tue, 6 Jan 2026 18:57:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.129.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767725822; cv=none; b=vB/1g5fDKNOBoIHgZyXAWIxo1dS02BKyvlwl8kigsL+RZh4bPK4aMS09BMObXhlfksyM7q43+YcYvEAJQwT8zt+DaHoOp4F0k/iRklag3NiQMCd/35MeYBK6r3i0z5gOxvXCRljlcmJbmgk/2n/OQdnwDELQinkCrOyGtQUVikI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767725822; c=relaxed/simple; bh=meJWznmpisb4Z0tj5/BsgVG4zJyBnjMbDiLi5lcu3Rc=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=HhgMgBsjR7xVYVTPvOUxzam5JdqKYvt3jEoji3efECMzZk38G2Ie2atkRhmuymS2Z8s8RcMQ/8F8SGKX+LUdePN6r6XOfmuRPq0//dtJ5HrPh/zwo59Vx/X7rF1/OMCfMXbZwJ7HT/lhAhTHxqYf3cVl5de6t8NReUJzj3cxxNQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=candelatech.com; spf=pass smtp.mailfrom=candelatech.com; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b=Waaw//hG; arc=none smtp.client-ip=148.163.129.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=candelatech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=candelatech.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b="Waaw//hG" X-Virus-Scanned: Proofpoint Essentials engine Received: from mail3.candelatech.com (mail.candelatech.com [208.74.158.173]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 2E321AC00E2; Tue, 6 Jan 2026 18:56:52 +0000 (UTC) Received: from [192.168.101.118] (firewall.candelatech.com [50.251.239.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail3.candelatech.com (Postfix) with ESMTPSA id 8479913C2B0; Tue, 6 Jan 2026 10:56:49 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 mail3.candelatech.com 8479913C2B0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=candelatech.com; s=default; t=1767725809; bh=meJWznmpisb4Z0tj5/BsgVG4zJyBnjMbDiLi5lcu3Rc=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=Waaw//hG/TyF6p7ucTuzVCWt0sB/c1bBOwzvPvXFFaqrOWX5OaI4iUxgMTnIK0tjT HSGT+l6t6n0WB5adf8kstK/WRwC4VBeXY+Le+U3dC4YDWOJObQFAEm3aL59WmsTFwQ IlZf5Zsqj1dZKpg3hFdSCWHoCHuNwi3fGnbwqJtM= Message-ID: Date: Tue, 6 Jan 2026 10:56:49 -0800 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG 6.18.2] Null Pointer Exception in Fair Scheduler From: "Dylan E." To: stable@vger.kernel.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org Cc: gregkh@linuxfoundation.org, sashal@kernel.org, jjohnson@kernel.org References: <38b9cad8-1c17-4d89-9f17-44f89fb66ab8@candelatech.com> Content-Language: en-US In-Reply-To: <38b9cad8-1c17-4d89-9f17-44f89fb66ab8@candelatech.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-MDID: 1767725813-gyDGdEY0fzPW X-PPE-STACK: {"stack":"us5"} X-MDID-O: us5;ut7;1767725813;gyDGdEY0fzPW;;6d78aa1bc4c2468e9f5ce884163e871b X-PPE-TRUSTED: V=1;DIR=OUT; Hello again, On 6.18.3, I'm still seeing the scheduler NPE pop-up, though this one happened at shutdown. Looks to be an identical location to the previous stack trace. --- BUG: kernel NULL pointer dereference, address: 0000000000000051 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP CPU: 0 UID: 0 PID: 336 Comm: (udev-worker) Not tainted 6.18.3 #39 PREEMPT(full) Hardware name: Default string Default string/SKYBAY, BIOS 5.12 02/21/2023 RIP: 0010:pick_task_fair+0x57/0x160 Code: 66 90 66 90 48 8b 5d 50 48 85 db 74 10 48 8b 73 70 48 89 ef e8 3a 74 ff ff 85 c0 75 71 be 01 00 00 00 48 89 ef e8 29 a5 ff ff <80> 78 51 00 48 89 c3 0f 85 80 00 00 00 48 85 c0 0f 84 87 00 00 00 RSP: 0018:ffffc9000091bca0 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000c00 RDX: fffffa1b1b2acc00 RSI: 0000000000001000 RDI: 0000000000000400 RBP: ffff8881255ef000 R08: 0000000000000400 R09: 0000000000000002 R10: 00000000000003ae R11: ffff88812d2cc200 R12: ffff88845dc2cd00 R13: 0000000000000000 R14: ffff88845dc2cd80 R15: ffffffff827c71e0 FS:  00007fed68640980(0000) GS:ffff8884da723000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000051 CR3: 00000001244dd006 CR4: 00000000003706f0 Call Trace:    pick_next_task_fair+0x1d/0x3d0  __schedule+0x1ee/0x10c0  ? sock_def_readable+0x3e/0xb0  ? sock_poll+0x4d/0xd0  schedule+0x23/0xc0  schedule_hrtimeout_range_clock+0xf4/0x100  do_epoll_wait+0x481/0x4b0  ? ep_destroy_wakeup_source+0x20/0x20  __x64_sys_epoll_wait+0x5a/0xf0  ? syscall_trace_enter+0x8d/0x1a0  do_syscall_64+0x50/0x3a0  entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fed69033ea7 Code: 0c 00 f7 d8 64 89 02 b8 ff ff ff ff eb be 0f 1f 44 00 00 f3 0f 1e fa 80 3d c5 a4 0c 00 00 41 89 ca 74 10 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 55 48 89 e5 48 83 ec 20 89 55 f8 48 89 RSP: 002b:00007ffd7c3b5508 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007fed69033ea7 RDX: 0000000000000006 RSI: 0000558994c733e0 RDI: 0000000000000003 RBP: 00007ffd7c3b5620 R08: 0000558994c42010 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000202 R12: 0000558994c733e0 R13: 0000000000000002 R14: 0000558994c73060 R15: ffffffffffffffff   Modules linked in: i915 drm_buddy intel_gtt drm_client_lib drm_display_helper drm_kms_helper cec rc_core ttm agpgart ixgbe igb mdio i2c_algo_bit libie_fwlog drm dca hwmon intel_oc_wdt i2c_core mei_wdt video wmi CR2: 0000000000000051 ---[ end trace 0000000000000000 ]--- RIP: 0010:pick_task_fair+0x57/0x160 Code: 66 90 66 90 48 8b 5d 50 48 85 db 74 10 48 8b 73 70 48 89 ef e8 3a 74 ff ff 85 c0 75 71 be 01 00 00 00 48 89 ef e8 29 a5 ff ff <80> 78 51 00 48 89 c3 0f 85 80 00 00 00 48 85 c0 0f 84 87 00 00 00 RSP: 0018:ffffc9000091bca0 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000c00 RDX: fffffa1b1b2acc00 RSI: 0000000000001000 RDI: 0000000000000400 RBP: ffff8881255ef000 R08: 0000000000000400 R09: 0000000000000002 R10: 00000000000003ae R11: ffff88812d2cc200 R12: ffff88845dc2cd00 R13: 0000000000000000 R14: ffff88845dc2cd80 R15: ffffffff827c71e0 FS:  00007fed68640980(0000) GS:ffff8884da723000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000051 CR3: 00000001244dd006 CR4: 00000000003706f0 Kernel panic - not syncing: Fatal exception Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 30 seconds.. --- Let me know if I can provide anymore information! -- Dylan