From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38078C41513 for ; Tue, 17 Oct 2023 09:17:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234758AbjJQJRS (ORCPT ); Tue, 17 Oct 2023 05:17:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234821AbjJQJRP (ORCPT ); Tue, 17 Oct 2023 05:17:15 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84018B0 for ; Tue, 17 Oct 2023 02:17:13 -0700 (PDT) Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39H9Ea5M018239; Tue, 17 Oct 2023 09:17:04 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : content-type : content-transfer-encoding : mime-version : subject : message-id : date : cc : to; s=pp1; bh=xN7Xz7bdiV5FnscEEpFBNx8e2AdVqvL557a7SjDjUCc=; b=BBOkZpngSynpO7I96rj6RaYMTlDSJ16LvmA5XFsYg8fJUW+xo4NbCKs/aSicy1cnyz6e vqmAev1N+pE9WpPx3VmYu+LfjyoMSV5Er+pQqv6dkbaV0anwyiY+FfO4LTgoT3h6doRQ NMpV+lC0dlK3bckH/O8J+uVHS9cD0eT3hrtAiz3n02sGYKc988ixC+qtkGG6Df0pyBzr OYxhtBpbreG28bs/Ld7DnB/XZuqc8Qth77TnW8nUQ+vVJ1i0bfWM+MAiuzi0zwlaVASD gJDHugxrMn6v2TlmN4ShViGNh3/9dNlt+CKP9fOe3MZil71W+VzX+fiYlchBMX4S3S8y tw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3tsqf58566-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 09:17:03 +0000 Received: from m0356516.ppops.net (m0356516.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 39H9EnKt019342; Tue, 17 Oct 2023 09:16:58 GMT Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3tsqf584a4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 09:16:57 +0000 Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 39H8sxfW012850; Tue, 17 Oct 2023 09:16:22 GMT Received: from smtprelay07.fra02v.mail.ibm.com ([9.218.2.229]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3tr5py7uq5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 09:16:22 +0000 Received: from smtpav07.fra02v.mail.ibm.com (smtpav07.fra02v.mail.ibm.com [10.20.54.106]) by smtprelay07.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 39H9GJc237945844 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 17 Oct 2023 09:16:19 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 50D702004B; Tue, 17 Oct 2023 09:16:19 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3783B20043; Tue, 17 Oct 2023 09:16:18 +0000 (GMT) Received: from smtpclient.apple (unknown [9.43.80.84]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 17 Oct 2023 09:16:17 +0000 (GMT) From: Sachin Sant Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.100.2.1.4\)) Subject: [powerpc] Kernel crash while running LTP (bisected) Message-Id: <81C9E2C1-DCC3-4DDD-8466-069893398B5B@linux.ibm.com> Date: Tue, 17 Oct 2023 14:46:07 +0530 Cc: linux-mm@kvack.org, open list To: linuxppc-dev , lstoakes@gmail.com X-Mailer: Apple Mail (2.3774.100.2.1.4) X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: otCDU0km5g1xxX2zAESsEmX8oPRpQBzX X-Proofpoint-GUID: j6wSEwpGQIVJ5sULyiTY_orJXecYQi4D X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-16_13,2023-10-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=672 mlxscore=0 suspectscore=0 bulkscore=0 phishscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 priorityscore=1501 spamscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310170076 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While running LTP tests (getpid02) on a Power10 server booted with 6.6.0-rc6-next-20231016 following crash was seen: [ 76.386628] Kernel attempted to read user page (d8) - exploit = attempt? (uid: 0) [ 76.386649] BUG: Kernel NULL pointer dereference on read at = 0x000000d8 [ 76.386653] Faulting instruction address: 0xc0000000004cda90 [ 76.386658] Oops: Kernel access of bad area, sig: 11 [#1] [ 76.386661] LE PAGE_SIZE=3D64K MMU=3DRadix SMP NR_CPUS=3D8192 NUMA = pSeries [ 76.386667] Modules linked in: rpadlpar_io rpaphp xsk_diag = nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet = nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat = nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bonding rfkill tls ip_set = nf_tables nfnetlink sunrpc pseries_rng vmx_crypto aes_gcm_p10_crypto = binfmt_misc xfs libcrc32c sd_mod t10_pi sr_mod cdrom crc64_rocksoft = crc64 sg ibmvscsi ibmveth scsi_transport_srp fuse [ 76.386709] CPU: 22 PID: 5763 Comm: getpid02 Kdump: loaded Not = tainted 6.6.0-rc6-next-20231016 #3 [ 76.386713] Hardware name: IBM,9080-HEX POWER10 (raw) 0x800200 = 0xf000006 of:IBM,FW1030.20 (NH1030_058) hv:phyp pSeries [ 76.386718] NIP: c0000000004cda90 LR: c0000000004cd840 CTR: = 0000000000000000 [ 76.386721] REGS: c0000001f491b840 TRAP: 0300 Not tainted = (6.6.0-rc6-next-20231016) [ 76.386724] MSR: 8000000000009033 CR: = 48082804 XER: 00000000 [ 76.386733] CFAR: c0000000004cd848 DAR: 00000000000000d8 DSISR: = 40000000 IRQMASK: 0 [ 76.386733] GPR00: c0000000004cd840 c0000001f491bae0 c000000001471a00 = 0000000000000000 [ 76.386733] GPR04: 00000000000000fb 0000000000000000 0000000000000000 = 0000000000000001 [ 76.386733] GPR08: 00000000000001c4 c0000001fb8aa830 c0000001e5140d00 = c0000001eccfac00 [ 76.386733] GPR12: 000000000000001f c000000e87bf7300 0000000000000000 = 0000000000000000 [ 76.386733] GPR16: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000000 [ 76.386733] GPR20: 00007fff9944ffff 0000000000000000 c0000001e86bdd60 = c0000001e86be8e0 [ 76.386733] GPR24: 0000000000000001 0000000000000001 0000000000000001 = 0000000000000000 [ 76.386733] GPR28: 00000000000000fb c0000001e5140d00 00007fff99440000 = c0000001fb8aa830 [ 76.386773] NIP [c0000000004cda90] mmap_region+0x8b0/0xb30 [ 76.386781] LR [c0000000004cd840] mmap_region+0x660/0xb30 [ 76.386784] Call Trace: [ 76.386786] [c0000001f491bae0] [c0000000004cd840] = mmap_region+0x660/0xb30 (unreliable) [ 76.386791] [c0000001f491bc10] [c0000000004ce0dc] do_mmap+0x3cc/0x5c0 [ 76.386794] [c0000001f491bca0] [c000000000486724] = vm_mmap_pgoff+0x134/0x240 [ 76.386800] [c0000001f491bd80] [c0000000004c98a8] = ksys_mmap_pgoff+0x158/0x2b0 [ 76.386806] [c0000001f491bdf0] [c000000000011834] do_mmap2+0x54/0xc0 [ 76.386811] [c0000001f491be10] [c000000000036624] = system_call_exception+0x134/0x330 [ 76.386817] [c0000001f491be50] [c00000000000d6a0] = system_call_common+0x160/0x2e4 [ 76.386822] --- interrupt: c00 at 0x7fff9932ff68 [ 76.386825] NIP: 00007fff9932ff68 LR: 0000000010005074 CTR: = 0000000000000000 [ 76.386828] REGS: c0000001f491be80 TRAP: 0c00 Not tainted = (6.6.0-rc6-next-20231016) [ 76.386831] MSR: 800000000280f033 = CR: 24002204 XER: 00000000 [ 76.386840] IRQMASK: 0 [ 76.386840] GPR00: 000000000000005a 00007fffd709f9f0 00007fff99407300 = 0000000000000000 [ 76.386840] GPR04: 0000000000000004 0000000000000003 0000000000000021 = ffffffffffffffff [ 76.386840] GPR08: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000000 [ 76.386840] GPR12: 0000000000000000 00007fff994ea3d0 0000000000000000 = 0000000000000000 [ 76.386840] GPR16: ffffffffffffffff 0000000010034498 0000000010034be8 = 00000000100336a8 [ 76.386840] GPR20: 0000000010034ba8 0000000000000001 000000001007c418 = 0000000010033770 [ 76.386840] GPR24: 0000000000000000 0000000000000000 0000000010034bd0 = 000000001007c438 [ 76.386840] GPR28: 0000000010061c88 00007fffd70afed5 000000001007c438 = 0000000010033770 [ 76.386876] NIP [00007fff9932ff68] 0x7fff9932ff68 [ 76.386879] LR [0000000010005074] 0x10005074 [ 76.386881] --- interrupt: c00 [ 76.386883] Code: 73890008 4082012c e93f0020 3b000000 fb7f0078 = 4bfffc74 60000000 60000000 e87f0088 3b000000 4bffff20 60000000 = 39490044 7d005028 3108ffff [ 76.386896] ---[ end trace = 0000000000000000 ]--- [ 76.388667] pstore: backend (nvram) writing error (-1) Git bisect points to following patch commit 1db41d29b79ad271674081c752961edd064bbbac mm: perform the mapping_map_writable() check after call_mmap() Reverting the patch allows the test to complete. - Sachin=