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Mon, 28 Apr 2025 07:07:44 +0000 (GMT) Message-ID: Date: Mon, 28 Apr 2025 12:37:43 +0530 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-GB To: LKML , linux-block@vger.kernel.org, Nilay Shroff , shinichiro.kawasaki@wdc.com, Madhavan Srinivasan From: Venkat Rao Bagalkote Subject: [mainline]WARNING: CPU: 29 PID: 1121679 at block/genhd.c:302 unregister_blkdev+0x1e8/0x2b0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: wqvGc2dr8XvS1ZIGziPgbaLKGIV5rqnV X-Authority-Analysis: v=2.4 cv=GJYIEvNK c=1 sm=1 tr=0 ts=680f2944 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=XR8D0OoHHMoA:10 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=PH-0tSwyd6fM5Fd3fpAA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNDI4MDA1OCBTYWx0ZWRfX7ASWhoCc4k82 PVDY1ZgrHQcIV6WYlKFp2dHwCIv8Et2jJrRdWOj6/dS/f2JC09YBciHvyKk0eaESclt+Syc2Riv szEzXeutwfkEp4X1S8ucW9NHfd/xCkbGtHqeGNTiG/Mq0XRyCzijQONJn5lMvJn2fENcX0KyWxd F/NS9TGn4hZxm0VXVLWKtr+EK+its4nhT3daVTBHTXoCk+OdA4ahAexYfU1givhuRtdSfdzhMtc YHSl8gIo2et021kEJounTViwDlYCQNeD3hI/s9loZ9Kh1y0f5IPNZvzt3jvFX3Gf3/mDR3BcFzt v9Sq/EDp05drzakr2SwQBq9qrAFx7wfjRGok6P7mg+TttpdNbJHEg4lTiuCY//+XsmLAEXRnVh+ 7F5d5dwM4BLOYmSLLb/vad0yvpm83o0GNejoviKoB63GafKYaihpHwk4iXbWfDzwqDlRM5hS X-Proofpoint-ORIG-GUID: wqvGc2dr8XvS1ZIGziPgbaLKGIV5rqnV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-04-28_02,2025-04-24_02,2025-02-21_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 mlxscore=0 phishscore=0 impostorscore=0 suspectscore=0 priorityscore=1501 adultscore=0 clxscore=1011 bulkscore=0 lowpriorityscore=0 mlxlogscore=928 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2504070000 definitions=main-2504280058 Hello, I am observing kernel warnings on the mainline kernel, while running block_dev Tests from LTP test suite, on IBM Power servers. Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git I have not started the bisection yet. Warnings: [13323.500222] ltp_block_dev: Test Case 7: unregister_blkdev() with major=0 [13323.500232] ------------[ cut here ]------------ [13323.500236] WARNING: CPU: 29 PID: 1121679 at block/genhd.c:302 unregister_blkdev+0x1e8/0x2b0 [13323.500245] Modules linked in: ltp_block_dev(O) dummy veth dns_resolver tun brd overlay exfat vfat fat btrfs blake2b_generic xor raid6_pq zstd_compress xfs loop sctp ip6_udp_tunnel udp_tunnel 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 tls rfkill ip_set nf_tables nfnetlink pseries_rng vmx_crypto dax_pmem fuse ext4 crc16 mbcache jbd2 sd_mod sg nd_pmem nd_btt papr_scm ibmvscsi scsi_transport_srp ibmveth libnvdimm [last unloaded: ltp_fw_load(O)] [13323.500297] CPU: 29 UID: 0 PID: 1121679 Comm: block_dev Kdump: loaded Tainted: G   M       O  K     6.15.0-rc3-gbc3372351d0c #1 VOLUNTARY [13323.500304] Tainted: [M]=MACHINE_CHECK, [O]=OOT_MODULE, [K]=LIVEPATCH [13323.500313] NIP:  c000000000882d40 LR: c000000000882bc0 CTR: c000000000882b58 [13323.500317] REGS: c00000006ff0f8b0 TRAP: 0700   Tainted: G M       O  K      (6.15.0-rc3-gbc3372351d0c) [13323.500322] MSR:  8000000000029033   CR: 28008222  XER: 2004000d [13323.500331] CFAR: c000000000882be4 IRQMASK: 0 [13323.500331] GPR00: c000000000882bc0 c00000006ff0fb50 c000000001688100 c000000002fdb2e8 [13323.500331] GPR04: c008000006790118 000000000000000d 000000000000003b fffffffffffe0000 [13323.500331] GPR08: 0000000000000000 0000000000000000 0000000000000000 c008000006691498 [13323.500331] GPR12: c000000000882b58 c000000efde70300 0000000000000000 0000000000000000 [13323.500331] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [13323.500331] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [13323.500331] GPR24: 0000000000000000 0000000000000000 c0000000671767a0 c008000006790118 [13323.500331] GPR28: c000000002bca9b8 c000000002fdaae8 0000000000000000 0000000000000000 [13323.500376] NIP [c000000000882d40] unregister_blkdev+0x1e8/0x2b0 [13323.500381] LR [c000000000882bc0] unregister_blkdev+0x68/0x2b0 [13323.500386] Call Trace: [13323.500388] [c00000006ff0fb50] [c000000000882bb0] unregister_blkdev+0x58/0x2b0 (unreliable) [13323.500395] [c00000006ff0fba0] [c008000006691058] sys_tcase+0x804/0x938 [ltp_block_dev] [13323.500401] [c00000006ff0fc80] [c000000000ac2454] dev_attr_store+0x34/0x50 [13323.500408] [c00000006ff0fca0] [c000000000737d6c] sysfs_kf_write+0x78/0x8c [13323.500413] [c00000006ff0fcc0] [c0000000007367cc] kernfs_fop_write_iter+0x1b4/0x2a4 [13323.500419] [c00000006ff0fd10] [c000000000628d28] vfs_write+0x38c/0x488 [13323.500424] [c00000006ff0fdc0] [c000000000629158] ksys_write+0x84/0x140 [13323.500429] [c00000006ff0fe10] [c0000000000332f8] system_call_exception+0x138/0x330 [13323.500436] [c00000006ff0fe50] [c00000000000d05c] system_call_vectored_common+0x15c/0x2ec [13323.500442] --- interrupt: 3000 at 0x7fff92933e74 [13323.500446] NIP:  00007fff92933e74 LR: 00007fff92933e74 CTR: 0000000000000000 [13323.500450] REGS: c00000006ff0fe80 TRAP: 3000   Tainted: G M       O  K      (6.15.0-rc3-gbc3372351d0c) [13323.500455] MSR:  800000000280f033   CR: 44002424  XER: 00000000 [13323.500466] IRQMASK: 0 [13323.500466] GPR00: 0000000000000004 00007fffd5bca940 0000000010067f00 0000000000000003 [13323.500466] GPR04: 0000000030a90b50 0000000000000001 0000000000000000 0000000000000001 [13323.500466] GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [13323.500466] GPR12: 0000000000000000 00007fff92c5a5c0 0000000000000000 00000000100332d0 [13323.500466] GPR16: 0000000010033608 0000000010033ce4 0000000010033ce8 0000000010033b60 [13323.500466] GPR20: 0000000000000001 0000000000000000 0000000000000000 0000000000000000 [13323.500466] GPR24: 0000000010060848 00000000100307b0 0000000030a90b50 0000000000000001 [13323.500466] GPR28: 0000000000000001 0000000030a902a0 0000000030a90b50 0000000000000001 [13323.500508] NIP [00007fff92933e74] 0x7fff92933e74 [13323.500512] LR [00007fff92933e74] 0x7fff92933e74 [13323.500515] --- interrupt: 3000 [13323.500517] Code: 7d404c28 39200000 7d094bf8 7d0753f8 7d293b39 408200cc 389b0040 38630040 48851ecd 60000000 48000084 60000000 <0fe00000> a14d0c82 3be00000 7da96b78 [13323.500531] ---[ end trace 0000000000000000 ]--- [13323.500535] ltp_block_dev: Test Case Result: PASS If you happen to fix this, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.