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Thu, 12 Nov 2026 06:38:06 +0000 (GMT) Received: from [9.61.240.49] (unknown [9.61.240.49]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 12 Nov 2026 06:38:06 +0000 (GMT) Message-ID: <0d9a9fd6-3824-4709-a7f7-eb1d5849e079@linux.ibm.com> Date: Thu, 12 Nov 2026 12:08:05 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-GB To: Ted Tso , Jan Kara , Ojaswin Mujoo , Ritesh Harjani , Madhavan Srinivasan Cc: linuxppc-dev , LKML , linux-ext4@vger.kernel.org From: Venkat Rao Bagalkote Subject: [next-20261111] ext4: Oops in ext4_writepages() during fast commit, replay (generic/483, 64K pagesize, ppc64le) Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEyMDAyNCBTYWx0ZWRfXzkSZbFjxUcGT l7AtGG2qgqdbdP8Y9/Xet/7YTiVMhCgVj7S8hWfxXsCELQlYmCx2b/ntkFCZmAXWv5puG7UPohn KAIUjK1hZ9wI/NHQL/i13ZAI8f0uocI= X-Authority-Analysis: v=2.4 cv=GISdgeNK c=1 sm=1 tr=0 ts=6af55ed2 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=-IFbq3Xo538CQDMHEQUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: HUuwRGpVZWvqaF-BWHFBlM4Dujs-ih3S X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEyMDAyNCBTYWx0ZWRfX1tyninbRGAkw RjRCTtWO2WMkrA4/R1BhnSdfLgQSQkgVU01gw6+MunDpvC5QTnLkQlF9hIUa3RCSKw/MrSb4V9N GPzTO2nqZiyr6n3sAAw2i8MFb7cOrtvwr2f2QTfnDqL2+SmFkyK9Xd8BYzAJZzKAeky7GYqG0jY Gy2HY90IWENDAIdaxzK3Uh7zkD/xqMZAqdDIPbFU1R/QC5amOiV9DDAgmru9ZIT2/AL+oTLnrz4 sIG+LZnxHZnPX1VzS9VORAqMm2JqIdPba/hmFB5QN8WTwjWaMg3ZoyFT+TIpALwImli4W/iGNqe xQgQGDSc3DFtXTrRymDO8qtzkpdu3krpAEr9bGuWKmw7HF2y8xGlpRrDpvS+NLM8+4ekGWmd28o EO4IEJc6MmtLex0mBYfyITBlA2vIOjAjrkwxX4XbZPPnU86SBOslmyc0oEWb5pb/FCmjiLmnW9P ffm4OFACuOg/p3zLWbQ== X-Proofpoint-ORIG-GUID: HUuwRGpVZWvqaF-BWHFBlM4Dujs-ih3S X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-12_01,2026-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 impostorscore=0 clxscore=1015 adultscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611120024 Hi, While running xfstests on linux-next next-20261111 on a Power9 pSeries LPAR with 64K PAGE_SIZE, generic/483 on ext4 (64K block size, fast_commit enabled) triggers a kernel oops. Reproducer ---------- Kernel:   7.4.0-rc2-next-20261111 (ppc64le, PAGE_SIZE=64K, Hash MMU) Hardware: IBM 8375-42A POWER9 (pSeries LPAR) xfstests local.config:   export FSTYP=ext4   export TEST_DEV=/dev/loop0   export TEST_DIR=/mnt/test   export SCRATCH_DEV=/dev/loop1   export SCRATCH_MNT=/mnt/scratch   export MKFS_OPTIONS="-b 65536 -O fast_commit"   ./check -ext4 generic/483 Oops ---- [14844.411091] EXT4-fs (dm-0): mounted filesystem 7ef13de7-... r/w with ordered data mode. Quota mode: none. [14847.236154] EXT4-fs (dm-0): unmounting filesystem 7ef13de7-... [14847.275380] Kernel attempted to read user page (1174770000) - exploit attempt? (uid: 0) [14847.275406] BUG: Unable to handle kernel data access on read at 0x1174770000 [14847.275414] Faulting instruction address: 0xc00800000ed42f74 [14847.275423] Oops: Kernel access of bad area, sig: 11 [#1] [14847.275430] LE PAGE_SIZE=64K MMU=Hash  SMP NR_CPUS=8192 NUMA pSeries [14847.275575] CPU: 26 UID: 0 PID: 53042 Comm: mount Kdump: loaded Not tainted 7.4.0-rc2-next-20261111 #1 PREEMPT(lazy) [14847.275587] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries [14847.275597] NIP:  c00800000ed42f74 LR: c00800000ed42f70 CTR: c0000000009e2a60 [14847.275647] CFAR: c00000000000db4c DAR: 0000001174770000 DSISR: 40000000 IRQMASK: 1 [14847.275771] NIP [c00800000ed42f74] ext4_writepages+0x12c/0x3a0 [ext4] [14847.275908] LR [c00800000ed42f70] ext4_writepages+0x128/0x3a0 [ext4] [14847.276038] Call Trace: [14847.276058]  do_writepages+0x190/0x330 [14847.276073]  __writeback_single_inode+0x9c/0xa30 [14847.276087]  writeback_single_inode+0x18c/0x2a0 [14847.276101]  write_inode_now+0xc0/0x100 [14847.276114]  iput_final+0x10c/0x300 [14847.276128]  ext4_fc_replay_add_range+0x2f0/0x5a0 [ext4] [14847.276262]  ext4_fc_replay+0x564/0xdd0 [ext4] [14847.276394]  do_one_pass+0x9bc/0x1370 [jbd2] [14847.276439]  jbd2_journal_recover+0x358/0x400 [jbd2] [14847.276481]  jbd2_journal_load+0x28/0x110 [jbd2] [14847.276530]  ext4_load_journal+0x7cc/0xc60 [ext4] [14847.276664]  ext4_load_and_init_journal+0x6c/0x680 [ext4] [14847.276801]  __ext4_fill_super+0x1454/0x2360 [ext4] [14847.276937]  ext4_fill_super+0x188/0x4d0 [ext4] [14847.277072]  get_tree_bdev_flags+0x250/0x350 [14847.277086]  ext4_get_tree+0x24/0x40 [ext4] [14847.277221]  vfs_get_tree+0x78/0x210 [14847.277234]  vfs_cmd_create+0x8c/0x1a0 [14847.277246]  __do_sys_fsconfig+0x58c/0x880 [14847.277259]  system_call_exception+0x3c4/0x600 [14847.277273]  system_call_vectored_common+0x15c/0x2ec [14847.277477] Code: 387f0740 480b8b11 e8410018 ebff0740 7dbe6b78 386d0030 480b8afd e8410018 ebde0030 7c7ff214 480b8b65 e8410018 <7d3ff02e> 7f83e378 39290001 7d3ff12e If you happen to fix this, Please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.