loop3: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in ciCompare fs/jfs/jfs_dtree.c:3416 [inline] BUG: KASAN: slab-out-of-bounds in dtSearch+0x1650/0x2050 fs/jfs/jfs_dtree.c:645 Read of size 1 at addr ffff888055f14054 by task syz.3.196/5459 CPU: 1 PID: 5459 Comm: syz.3.196 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 ciCompare fs/jfs/jfs_dtree.c:3416 [inline] dtSearch+0x1650/0x2050 fs/jfs/jfs_dtree.c:645 jfs_lookup+0x1ad/0x420 fs/jfs/namei.c:1461 __lookup_slow+0x29d/0x3f0 fs/namei.c:1698 lookup_slow+0x53/0x70 fs/namei.c:1715 walk_component fs/namei.c:2006 [inline] link_path_walk+0x945/0xe70 fs/namei.c:2333 path_parentat fs/namei.c:2534 [inline] __filename_parentat+0x226/0x650 fs/namei.c:2558 filename_parentat fs/namei.c:2576 [inline] filename_create+0xd5/0x470 fs/namei.c:3865 do_mkdirat+0xa5/0x440 fs/namei.c:4129 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4152 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f282119b687 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f282200ae58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f282200aee0 RCX: 00007f282119b687 RDX: 00000000000001ff RSI: 0000200000000200 RDI: 00000000ffffff9c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000200 R13: 00007f282200aea0 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the object at ffff888055f13780 which belongs to the cache jfs_ip of size 2240 The buggy address is located 20 bytes to the right of 2240-byte region [ffff888055f13780, ffff888055f14040) The buggy address belongs to the physical page: page:ffffea000157c400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55f10 head:ffffea000157c400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff8880667e3701 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801a3b13c0 raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff8880667e3701 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5459, tgid 5455 (syz.3.196), ts 158477921208, free_ts 15225975757 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc_lru+0x1ae/0x2e0 mm/slub.c:3390 alloc_inode_sb include/linux/fs.h:3245 [inline] jfs_alloc_inode+0x24/0x60 fs/jfs/super.c:105 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x5f/0x1c0 fs/inode.c:1063 new_inode+0x25/0x1c0 fs/inode.c:1091 jfs_fill_super+0x398/0xad0 fs/jfs/super.c:544 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508 free_contig_range+0x9d/0x150 mm/page_alloc.c:9625 destroy_args+0xf0/0xa0a mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x33c/0x38e mm/debug_vm_pgtable.c:1359 do_one_initcall+0x26a/0x840 init/main.c:1310 do_initcall_level+0x137/0x1e4 init/main.c:1383 do_initcalls+0x4b/0x8a init/main.c:1399 kernel_init_freeable+0x415/0x5be init/main.c:1638 kernel_init+0x19/0x1b0 init/main.c:1526 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888055f13f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888055f13f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888055f14000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888055f14080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888055f14100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================