================================================================== BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x12c6/0x3b20 fs/jfs/jfs_dtree.c:-1 Read of size 1 at addr ffff888073aaee9d by task syz.1.493/10012 CPU: 1 UID: 0 PID: 10012 Comm: syz.1.493 Not tainted 6.16.0-rc2-syzkaller-00278-g3f75bfff44be #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 dtSplitPage+0x12c6/0x3b20 fs/jfs/jfs_dtree.c:-1 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline] dtInsert+0x109b/0x5f40 fs/jfs/jfs_dtree.c:871 jfs_mknod+0x640/0x960 fs/jfs/namei.c:1410 vfs_mknod+0x37f/0x3c0 fs/namei.c:4244 do_mknodat+0x385/0x4d0 fs/namei.c:-1 __do_sys_mknod fs/namei.c:4327 [inline] __se_sys_mknod fs/namei.c:4325 [inline] __x64_sys_mknod+0x8c/0xa0 fs/namei.c:4325 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8c98f8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8c99e70038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00007f8c991b6080 RCX: 00007f8c98f8e929 RDX: 0000000000000703 RSI: 0000000000002000 RDI: 0000200000000780 RBP: 00007f8c99010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8c991b6080 R15: 00007ffd6c531578 Allocated by task 9970: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_lru_noprof+0x1c6/0x3d0 mm/slub.c:4216 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x67/0x1b0 fs/inode.c:346 iget_locked+0xf0/0x570 fs/inode.c:1439 jfs_iget+0x24/0x3e0 fs/jfs/inode.c:29 jfs_lookup+0x1c5/0x380 fs/jfs/namei.c:1469 lookup_one_qstr_excl_raw+0x115/0x280 fs/namei.c:1689 lookup_one_qstr_excl fs/namei.c:1711 [inline] filename_create+0x225/0x470 fs/namei.c:4149 do_mkdirat+0xa0/0x590 fs/namei.c:4400 __do_sys_mkdirat fs/namei.c:4425 [inline] __se_sys_mkdirat fs/namei.c:4423 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4423 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888073aae568 which belongs to the cache jfs_ip of size 2232 The buggy address is located 125 bytes to the right of allocated 2232-byte region [ffff888073aae568, ffff888073aaee20) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x73aa8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88804e9b1c01 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888146af6500 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff88804e9b1c01 head: 00fff00000000040 ffff888146af6500 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff88804e9b1c01 head: 00fff00000000003 ffffea0001ceaa01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9776, tgid 9775 (syz.4.470), ts 312614689751, free_ts 303598932796 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] kmem_cache_alloc_lru_noprof+0x288/0x3d0 mm/slub.c:4216 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x67/0x1b0 fs/inode.c:346 iget_locked+0xf0/0x570 fs/inode.c:1439 jfs_iget+0x24/0x3e0 fs/jfs/inode.c:29 jfs_fill_super+0x8c2/0xd90 fs/jfs/super.c:547 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1681 vfs_get_tree+0x92/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 page last free pid 6489 tgid 6489 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc65/0xe60 mm/page_alloc.c:2706 __slab_free+0x326/0x400 mm/slub.c:4554 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204 anon_vma_chain_alloc mm/rmap.c:142 [inline] __anon_vma_prepare+0xcb/0x4a0 mm/rmap.c:195 __vmf_anon_prepare mm/memory.c:3523 [inline] vmf_anon_prepare mm/internal.h:410 [inline] do_anonymous_page mm/memory.c:5087 [inline] do_pte_missing mm/memory.c:4249 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault+0x4d02/0x5620 mm/memory.c:6232 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6401 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 Memory state around the buggy address: ffff888073aaed80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888073aaee00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff888073aaee80: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ^ ffff888073aaef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888073aaef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================