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linux-nilfs@vger.kernel.org, linux-kernel@vger.kernel.org Cc: slava@dubeyko.com, konishi.ryusuke@gmail.com Date: Fri, 27 Mar 2026 13:48:35 -0700 In-Reply-To: <08A3603A-ADB6-484C-9015-9AC1340E6FB8@gmail.com> References: <08A3603A-ADB6-484C-9015-9AC1340E6FB8@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43app2) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi Shuangpeng, On Fri, 2026-03-27 at 16:42 -0400, Shuangpeng wrote: > Hi Kernel Maintainers, >=20 > I hit the following KASAN report while testing current upstream kernel: >=20 > KASAN: slab-out-of-bounds in nilfs_direct_propagate >=20 > on commit: bbeb83d3182abe0d245318e274e8531e5dd7a948 (Mar 24 2026) >=20 > The reproducer and .config files are here. > https://gist.github.com/shuangpengbai/d1df8da98f957e101dd5d580b7f82215 >=20 >=20 > I=E2=80=99m happy to test debug patches or provide additional information= . >=20 > Reported-by: Shuangpeng Bai >=20 >=20 > [ 80.873778][ T8573] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > [ 80.874653][ T8573] BUG: KASAN: slab-out-of-bounds in nilfs_direct_pro= pagate (fs/nilfs2/direct.c:26 fs/nilfs2/direct.c:275) > [ 80.875485][ T8573] Read of size 8 at addr ffff888178c4bd38 by task se= gctord/8573 > [ 80.876255][ T8573] > [ 80.876511][ T8573] CPU: 1 UID: 0 PID: 8573 Comm: segctord Not tainted= 7.0.0-rc5-00051-gbbeb83d3182a #35 PREEMPT(f > [ 80.876520][ T8573] Hardware name: QEMU Standard PC (i440FX + PIIX, 19= 96), BIOS 1.15.0-1 04/01/2014 > [ 80.876527][ T8573] Call Trace: > [ 80.876531][ T8573] > [ 80.876534][ T8573] dump_stack_lvl (lib/dump_stack.c:122) > [ 80.876544][ T8573] print_report (mm/kasan/report.c:379 mm/kasan/repo= rt.c:482) > [ 80.876608][ T8573] kasan_report (mm/kasan/report.c:597) > [ 80.876627][ T8573] nilfs_direct_propagate (fs/nilfs2/direct.c:26 fs/= nilfs2/direct.c:275) > [ 80.876721][ T8573] nilfs_bmap_propagate (fs/nilfs2/bmap.c:329) > [ 80.876740][ T8573] nilfs_segctor_apply_buffers (fs/nilfs2/segment.c:= 1010) > [ 80.876752][ T8573] nilfs_segctor_scan_file (fs/nilfs2/segment.c:1072= ) > [ 80.876822][ T8573] nilfs_segctor_do_construct (fs/nilfs2/segment.c:1= 223 fs/nilfs2/segment.c:1547 fs/nilfs2/segment.c:2122) > [ 80.876964][ T8573] nilfs_segctor_construct (fs/nilfs2/segment.c:2464= ) > [ 80.876975][ T8573] nilfs_segctor_thread (fs/nilfs2/segment.c:? fs/ni= lfs2/segment.c:2684) > [ 80.877059][ T8573] kthread (kernel/kthread.c:437) > [ 80.877072][ T8573] ret_from_fork (arch/x86/kernel/process.c:164) > [ 80.877106][ T8573] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) > [ 80.877118][ T8573] > [ 80.877121][ T8573] > [ 80.913570][ T8573] Allocated by task 8571 on cpu 1 at 80.799594s: > [ 80.914266][ T8573] kasan_save_track (mm/kasan/common.c:58 mm/kasan/c= ommon.c:78) > [ 80.914762][ T8573] __kasan_slab_alloc (mm/kasan/common.c:369) > [ 80.915266][ T8573] kmem_cache_alloc_lru_noprof (./include/linux/kasa= n.h:253 mm/slub.c:4538 mm/slub.c:4866 mm/slub.c:4885) > [ 80.915870][ T8573] nilfs_alloc_inode (fs/nilfs2/super.c:159) > [ 80.916370][ T8573] alloc_inode (fs/inode.c:?) > [ 80.916825][ T8573] iget5_locked (fs/inode.c:1390) > [ 80.917312][ T8573] nilfs_iget (fs/nilfs2/inode.c:562) > [ 80.917775][ T8573] nilfs_get_root_dentry (fs/nilfs2/super.c:915) > [ 80.918328][ T8573] nilfs_fill_super (fs/nilfs2/super.c:1099) > [ 80.918837][ T8573] nilfs_get_tree (fs/nilfs2/super.c:1229) > [ 80.919328][ T8573] vfs_get_tree (fs/super.c:1754) > [ 80.919791][ T8573] do_new_mount (fs/namespace.c:1194 fs/namespace.c:= 3763 fs/namespace.c:3839) > [ 80.920264][ T8573] __se_sys_mount (fs/namespace.c:4172 fs/namespace.= c:4361 fs/namespace.c:4338) > [ 80.920754][ T8573] do_syscall_64 (arch/x86/entry/syscall_64.c:?) > [ 80.921228][ T8573] entry_SYSCALL_64_after_hwframe (arch/x86/entry/en= try_64.S:130) > [ 80.921870][ T8573] > [ 80.922121][ T8573] The buggy address belongs to the object at ffff888= 178c4b930 > [ 80.922121][ T8573] which belongs to the cache nilfs2_inode_cache of = size 848 > [ 80.923593][ T8573] The buggy address is located 184 bytes to the righ= t of > [ 80.923593][ T8573] allocated 848-byte region [ffff888178c4b930, ffff= 888178c4bc80) > [ 80.925065][ T8573] > [ 80.925315][ T8573] The buggy address belongs to the physical page: > [ 80.926011][ T8573] page: refcount:0 mapcount:0 mapping:00000000000000= 00 index:0x0 pfn:0x178c48 > [ 80.926913][ T8573] head: order:2 mapcount:0 entire_mapcount:0 nr_page= s_mapped:0 pincount:0 > [ 80.927770][ T8573] memcg:ffff888178c4bd01 > [ 80.928208][ T8573] flags: 0x17ff00000000040(head|node=3D0|zone=3D2|la= stcpupid=3D0x7ff) > [ 80.928994][ T8573] page_type: f5(slab) > [ 80.929411][ T8573] raw: 017ff00000000040 ffff88810dab5c80 dead0000000= 00100 dead000000000122 > [ 80.930318][ T8573] raw: 0000000000000000 0000000800100010 00000000f50= 00000 ffff888178c4bd01 > [ 80.931195][ T8573] head: 017ff00000000040 ffff88810dab5c80 dead000000= 000100 dead000000000122 > [ 80.932076][ T8573] head: 0000000000000000 0000000800100010 00000000f5= 000000 ffff888178c4bd01 > [ 80.932957][ T8573] head: 017ff00000000002 ffffea0005e31201 00000000ff= ffffff 00000000ffffffff > [ 80.933864][ T8573] head: ffffffffffffffff 0000000000000000 00000000ff= ffffff 0000000000000004 > [ 80.934742][ T8573] page dumped because: kasan: bad access detected > [ 80.935400][ T8573] page_owner tracks the page as allocated > [ 80.935991][ T8573] page last allocated via order 2, migratetype Recla= imable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|_9 > [ 80.938243][ T8573] post_alloc_hook (./include/linux/page_owner.h:? m= m/page_alloc.c:1889) > [ 80.938742][ T8573] get_page_from_freelist (mm/page_alloc.c:? mm/page= _alloc.c:3962) > [ 80.939318][ T8573] __alloc_frozen_pages_noprof (mm/page_alloc.c:5250= ) > [ 80.939923][ T8573] allocate_slab (mm/slub.c:3294 mm/slub.c:3481) > [ 80.940398][ T8573] refill_objects (mm/slub.c:7176) > [ 80.940889][ T8573] __pcs_replace_empty_main (mm/slub.c:2815 mm/slub.= c:2834 mm/slub.c:4626) > [ 80.941462][ T8573] kmem_cache_alloc_lru_noprof (mm/slub.c:4718 mm/sl= ub.c:4851 mm/slub.c:4885) > [ 80.942092][ T8573] nilfs_alloc_inode (fs/nilfs2/super.c:159) > [ 80.942592][ T8573] alloc_inode (fs/inode.c:?) > [ 80.943045][ T8573] iget5_locked (fs/inode.c:1390) > [ 80.943502][ T8573] nilfs_attach_btree_node_cache (fs/nilfs2/inode.c:= 632) > [ 80.944120][ T8573] nilfs_btree_convert_and_insert (fs/nilfs2/btree.c= :1762 fs/nilfs2/btree.c:1902) > [ 80.944749][ T8573] nilfs_bmap_insert (fs/nilfs2/bmap.c:118 fs/nilfs2= /bmap.c:149) > [ 80.945263][ T8573] nilfs_mdt_get_block (fs/nilfs2/mdt.c:46 fs/nilfs2= /mdt.c:95 fs/nilfs2/mdt.c:258) > [ 80.945821][ T8573] nilfs_cpfile_create_checkpoint (fs/nilfs2/cpfile.= c:? fs/nilfs2/cpfile.c:330) > [ 80.946451][ T8573] nilfs_segctor_do_construct (fs/nilfs2/segment.c:1= 250 fs/nilfs2/segment.c:1547 fs/nilfs2/segment.c:2122) > [ 80.947065][ T8573] page last free pid 1 tgid 1 stack trace: > [ 80.947665][ T8573] __free_frozen_pages (./include/linux/page_owner.h:= ? mm/page_alloc.c:1433 mm/page_alloc.c:2978) > [ 80.948197][ T8573] free_contig_range (mm/page_alloc.c:7373) > [ 80.948699][ T8573] destroy_args (mm/debug_vm_pgtable.c:995) > [ 80.949174][ T8573] debug_vm_pgtable (mm/debug_vm_pgtable.c:?) > [ 80.949695][ T8573] do_one_initcall (init/main.c:?) > [ 80.950213][ T8573] do_initcall_level (init/main.c:1443) > [ 80.950721][ T8573] do_initcalls (init/main.c:1457) > [ 80.951173][ T8573] kernel_init_freeable (init/main.c:1696) > [ 80.951714][ T8573] kernel_init (init/main.c:1584) > [ 80.952167][ T8573] ret_from_fork (arch/x86/kernel/process.c:164) > [ 80.952651][ T8573] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) > [ 80.953151][ T8573] > [ 80.953400][ T8573] Memory state around the buggy address: > [ 80.954002][ T8573] ffff888178c4bc00: 00 00 00 00 00 00 00 00 00 00 0= 0 00 00 00 00 00 > [ 80.954819][ T8573] ffff888178c4bc80: fc fc fc fc fc fc fc fc fc fc f= c fc fc fc fc fc > [ 80.955641][ T8573] >ffff888178c4bd00: fc fc fc fc fc fc fc fc fc fc f= c fc fc fc fc fc > [ 80.956460][ T8573] ^ > [ 80.957067][ T8573] ffff888178c4bd80: fc fc fc fc fc fc fc fc fc fc f= c fc fc fc fc fc > [ 80.957917][ T8573] ffff888178c4be00: fc fc fc fc fc fc fc fc fc fc f= c fc fc fc fc fc > [ 80.958920][ T8541] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 Thank you for the report. Could you please create an issue here [1]? Thanks, Slava. [1] https://github.com/nilfs-dev/nilfs2/issues