loop0: 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+0x164c/0x2050 fs/jfs/jfs_dtree.c:645 Read of size 1 at addr ffff888060a02154 by task syz.0.20/4433 CPU: 0 PID: 4433 Comm: syz.0.20 Not tainted 6.1.148-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e 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+0x164c/0x2050 fs/jfs/jfs_dtree.c:645 jfs_lookup+0x152/0x380 fs/jfs/namei.c:1459 lookup_open fs/namei.c:3460 [inline] open_last_lookups fs/namei.c:3550 [inline] path_openat+0xfaf/0x2e70 fs/namei.c:3780 do_filp_open+0x1c1/0x3c0 fs/namei.c:3810 do_sys_openat2+0x142/0x490 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f1950f8ebe9 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:00007fffe6a19908 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f19511b5fa0 RCX: 00007f1950f8ebe9 RDX: 0000000000183341 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007f1951011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f19511b5fa0 R14: 00007f19511b5fa0 R15: 0000000000000004 The buggy address belongs to the object at ffff888060a01bc0 which belongs to the cache jfs_ip of size 2240 The buggy address is located 1428 bytes inside of 2240-byte region [ffff888060a01bc0, ffff888060a02480) The buggy address belongs to the physical page: page:ffffea0001828000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60a00 head:ffffea0001828000 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888078539501 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff8881472acc80 raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff888078539501 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 4433, tgid 4433 (syz.0.20), ts 72098813337, free_ts 61622820862 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x87/0x2c0 mm/slub.c:1992 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x1ae/0x2e0 mm/slub.c:3429 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 diReadSpecial+0x4e/0x700 fs/jfs/jfs_imap.c:426 jfs_mount+0x29e/0x860 fs/jfs/jfs_mount.c:138 jfs_fill_super+0x4de/0xac0 fs/jfs/super.c:556 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 __vunmap+0x856/0xa00 mm/vmalloc.c:2726 kcov_put kernel/kcov.c:437 [inline] kcov_close+0x27/0x50 kernel/kcov.c:533 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x93e/0x2400 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888060a02000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060a02080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888060a02100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888060a02180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060a02200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================