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Wed, 18 Feb 2026 11:36:07 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 7tS0ESeklWnOZQAAD6G6ig (envelope-from ); Wed, 18 Feb 2026 11:36:07 +0000 Message-ID: Date: Wed, 18 Feb 2026 12:36:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [next-20260216]NULL pointer dereference in drain_obj_stock() (RCU free path) Content-Language: en-US To: Carlos Maiolino , Venkat Rao Bagalkote , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, LKML , Madhavan Srinivasan , Ritesh Harjani , ojaswin@linux.ibm.com, Muchun Song , Cgroups , "linux-mm@kvack.org" , Harry Yoo , Hao Li References: From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Action: no action X-Rspamd-Server: rspam09 X-Stat-Signature: 64rimxe4kff8mrywyebp9sws5otmfud8 X-Rspamd-Queue-Id: 98E7B80003 X-Rspam-User: X-HE-Tag: 1771414569-996512 X-HE-Meta: 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 MVFlF5PU aOsVq8o/lE3xjikgFBHJkRlVVmwSz9mf8nEs8JWQOoNTKiw+gv7YwMzf3geM3cFA1BGbGeyMB/ft3vcMWNBuL+W2DR3xRr7ynlwksETAvBrTtLjhIi4Co2jlzXnl61bHvjraB1khRbRHHnH6RwDeQlLbBpr6G1BymjZaDNfkQe7xMYz09Cq9mM17FHHJRU6Dwc5Vnv6oeaQFTbeLGbckG/9XxiLr8DNbfL+oZqGGEvEy20A9HHL4P7GafipdAOlSZGj5Eq+eADstOe2BjnOZo75smvH9N3ZfjKQA0Rro1reagO7x5DI1hycxsOxscPVxBjz7g+FhgqXXYFJLlHGVnug3pDz3ilF00iUwBRlO+24T76kynXYZvE1llxu5AZjGx9nSS/Va/mfAkGgq6BA1/bnaFYg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/17/26 13:40, Carlos Maiolino wrote: > On Tue, Feb 17, 2026 at 04:59:12PM +0530, Venkat Rao Bagalkote wrote: >> Greetings!!! >> >> I am observing below OOPs, while running xfstests generic/428 test case. But >> I am not able to reproduce this consistently. >> >> >> Platform: IBM Power11 (pSeries LPAR), Radix MMU, LE, 64K pages >> Kernel: 6.19.0-next-20260216 >> Tests: generic/428 >> >> local.config >>> >> [xfs_4k] >> export RECREATE_TEST_DEV=true >> export TEST_DEV=/dev/loop0 >> export TEST_DIR=/mnt/test >> export SCRATCH_DEV=/dev/loop1 >> export SCRATCH_MNT=/mnt/scratch >> export MKFS_OPTIONS="-b size=4096" >> export FSTYP=xfs >> export MOUNT_OPTIONS=""- >> >> >> >> Attached is .config file used. >> >> >> Traces: >> > > /me fixing trace's indentation CCing memcg and slab folks. Would be nice to figure out where in drain_obj_stock things got wrong. Any change for e.g. ./scripts/faddr2line ? I wonder if we have either some bogus objext pointer, or maybe the rcu_free_sheaf() context is new (or previously rare) for memcg and we have some locking issues being exposed in refill/drain. >> >> [ 6054.957411] run fstests generic/428 at 2026-02-16 22:25:57 >> [ 6055.136443] Kernel attempted to read user page (0) - exploit attempt? >> (uid: 0) >> [ 6055.136474] BUG: Kernel NULL pointer dereference on read at 0x00000000 >> [ 6055.136485] Faulting instruction address: 0xc0000000008aff0c >> [ 6055.136495] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 6055.136505] LE PAGE_SIZE=64K MMU=Radix  SMP NR_CPUS=8192 NUMA pSeries >> [ 6055.136517] Modules linked in: dm_thin_pool dm_persistent_data >> dm_bio_prison dm_snapshot dm_bufio dm_flakey xfs loop dm_mod 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 ip_set tls nf_tables rfkill sunrpc >> nfnetlink pseries_rng vmx_crypto dax_pmem fuse ext4 crc16 mbcache jbd2 >> nd_pmem papr_scm sd_mod libnvdimm sg ibmvscsi ibmveth scsi_transport_srp >> pseries_wdt [last unloaded: scsi_debug] >> [ 6055.136684] CPU: 19 UID: 0 PID: 0 Comm: swapper/19 Kdump: loaded Tainted: >> G        W           6.19.0-next-20260216 #1 PREEMPTLAZY >> [ 6055.136701] Tainted: [W]=WARN >> [ 6055.136708] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 >> 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries >> [ 6055.136719] NIP:  c0000000008aff0c LR: c0000000008aff00 CTR: >> c00000000036d5e0 >> [ 6055.136730] REGS: c000000d0dc877c0 TRAP: 0300   Tainted: G   W            >> (6.19.0-next-20260216) >> [ 6055.136742] MSR:  8000000000009033   CR: 84042802 XER: 20040037 >> [ 6055.136777] CFAR: c000000000862a74 DAR: 0000000000000000 DSISR: 40000000 IRQMASK: 0 >> [ 6055.136777] GPR00: c0000000008aff00 c000000d0dc87a60 c00000000243a500 0000000000000001 >> [ 6055.136777] GPR04: 0000000000000008 0000000000000001 c0000000008aff00 0000000000000001 >> [ 6055.136777] GPR08: a80e000000000000 0000000000000001 0000000000000007 >> a80e000000000000 >> [ 6055.136777] GPR12: c00e00000c46e6d5 c000000d0ddf0b00 c000000019069a00 >> 0000000000000006 >> [ 6055.136777] GPR16: c000000007012fa0 c000000007012fa4 c000000005160980 >> c000000007012f88 >> [ 6055.136777] GPR20: c00c0000004d7cec c000000d0d10f008 0000000000000001 >> ffffffffffffff78 >> [ 6055.136777] GPR24: 0000000000000005 c000000d0d58f180 c0000001d0795e00 >> c000000d0d10f01c >> [ 6055.136777] GPR28: c000000d0d10f008 c000000d0d10f010 c0000001d0795e08 >> 0000000000000000 >> [ 6055.136891] NIP [c0000000008aff0c] drain_obj_stock+0x620/0xa48 >> [ 6055.136905] LR [c0000000008aff00] drain_obj_stock+0x614/0xa48 >> [ 6055.136915] Call Trace: >> [ 6055.136919] [c000000d0dc87a60] [c0000000008aff00] drain_obj_stock+0x614/0xa48 (unreliable) >> [ 6055.136933] [c000000d0dc87b10] [c0000000008b27e4] refill_obj_stock+0x104/0x680 >> [ 6055.136945] [c000000d0dc87b90] [c0000000008b9238] __memcg_slab_free_hook+0x238/0x3ec >> [ 6055.136956] [c000000d0dc87c60] [c0000000007f39a0] __rcu_free_sheaf_prepare+0x314/0x3e8 >> [ 6055.136968] [c000000d0dc87d10] [c0000000007fbf0c] rcu_free_sheaf+0x38/0x170 >> [ 6055.136980] [c000000d0dc87d50] [c0000000003344b0] rcu_do_batch+0x2ec/0xfa8 >> [ 6055.136992] [c000000d0dc87e50] [c000000000339948] rcu_core+0x22c/0x48c >> [ 6055.137002] [c000000d0dc87ec0] [c0000000001cfe6c] handle_softirqs+0x1f4/0x74c >> [ 6055.137013] [c000000d0dc87fe0] [c00000000001b0cc] do_softirq_own_stack+0x60/0x7c >> [ 6055.137025] [c000000009717930] [c00000000001b0b8] do_softirq_own_stack+0x4c/0x7c >> [ 6055.137036] [c000000009717960] [c0000000001cf128] __irq_exit_rcu+0x268/0x308 >> [ 6055.137046] [c0000000097179a0] [c0000000001d0ba4] irq_exit+0x20/0x38 >> [ 6055.137056] [c0000000097179c0] [c0000000000315f4] interrupt_async_exit_prepare.constprop.0+0x18/0x2c >> [ 6055.137069] [c0000000097179e0] [c000000000009ffc] decrementer_common_virt+0x28c/0x290 >> [ 6055.137080] ---- interrupt: 900 at plpar_hcall_norets_notrace+0x18/0x2c >> [ 6055.137090] NIP:  c00000000012d8f0 LR: c00000000135c3fc CTR: 0000000000000000 >> [ 6055.137097] REGS: c000000009717a10 TRAP: 0900   Tainted: G   W            (6.19.0-next-20260216) >> [ 6055.137105] MSR:  800000000280b033   CR: 24000804  XER: 00000037 >> [ 6055.137134] CFAR: 0000000000000000 IRQMASK: 0 >> [ 6055.137134] GPR00: 0000000000000000 c000000009717cb0 c00000000243a500 0000000000000000 >> [ 6055.137134] GPR04: 0000000000000000 800400002fe6fc10 0000000000000000 0000000000000001 >> [ 6055.137134] GPR08: 0000000000000033 0000000000000000 0000000000000090 0000000000000001 >> [ 6055.137134] GPR12: 800400002fe6fc00 c000000d0ddf0b00 0000000000000000 000000002ef01a60 >> [ 6055.137134] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 >> [ 6055.137134] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000001 >> [ 6055.137134] GPR24: 0000000000000000 c000000004d7a778 00000581d1a507b8 0000000000000000 >> [ 6055.137134] GPR28: 0000000000000000 0000000000000001 c0000000032b18d8 c0000000032b18e0 >> [ 6055.137229] NIP [c00000000012d8f0] plpar_hcall_norets_notrace+0x18/0x2c >> [ 6055.137238] LR [c00000000135c3fc] cede_processor.isra.0+0x1c/0x30 >> [ 6055.137248] ---- interrupt: 900 >> [ 6055.137253] [c000000009717cb0] [c000000009717cf0] 0xc000000009717cf0 (unreliable) >> [ 6055.137265] [c000000009717d10] [c0000000019af160] dedicated_cede_loop+0x90/0x170 >> [ 6055.137277] [c000000009717d60] [c0000000019aeb10] cpuidle_enter_state+0x394/0x480 >> [ 6055.137288] [c000000009717e00] [c0000000013589ec] cpuidle_enter+0x64/0x9c >> [ 6055.137298] [c000000009717e50] [c000000000284a8c] call_cpuidle+0x7c/0xf8 >> [ 6055.137310] [c000000009717e90] [c000000000290398] cpuidle_idle_call+0x1c4/0x2b4 >> [ 6055.137321] [c000000009717f00] [c0000000002905bc] do_idle+0x134/0x208 >> [ 6055.137330] [c000000009717f50] [c000000000290a0c] cpu_startup_entry+0x60/0x64 >> [ 6055.137341] [c000000009717f80] [c0000000000744b8] start_secondary+0x3fc/0x400 >> [ 6055.137352] [c000000009717fe0] [c00000000000e258] start_secondary_prolog+0x10/0x14 >> [ 6055.137363] Code: 60000000 3bda0008 7fc3f378 4bfb148d 60000000 ebfa0008 38800008 7fe3fb78 4bfb2b51 60000000 7c0004ac 39200001 <7d40f8a8> 7d495050 7d40f9ad 40c2fff4 >> [ 6055.137400] ---[ end trace 0000000000000000 ]--- > > Again, nothing here seems to point to a xfs problem. >