loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in ciCompare fs/jfs/jfs_dtree.c:3428 [inline] BUG: KASAN: slab-out-of-bounds in dtSearch+0x16b4/0x21b0 fs/jfs/jfs_dtree.c:645 Read of size 1 at addr ffff88805d3171a4 by task syz.0.17/5981 CPU: 0 UID: 0 PID: 5981 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 ciCompare fs/jfs/jfs_dtree.c:3428 [inline] dtSearch+0x16b4/0x21b0 fs/jfs/jfs_dtree.c:645 jfs_lookup+0x1b0/0x420 fs/jfs/namei.c:1464 __lookup_slow+0x2d2/0x440 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 walk_component fs/namei.c:2279 [inline] link_path_walk+0xd1e/0x18d0 fs/namei.c:2653 path_parentat fs/namei.c:2857 [inline] __filename_parentat+0x27f/0x6f0 fs/namei.c:2881 filename_parentat fs/namei.c:2899 [inline] filename_create+0xd9/0x370 fs/namei.c:4909 filename_mkdirat+0xd2/0x520 fs/namei.c:5265 __do_sys_mkdirat fs/namei.c:5293 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5290 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f77371cc819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd3bb85c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f7737445fa0 RCX: 00007f77371cc819 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f7737262c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7737445fac R14: 00007f7737445fa0 R15: 00007f7737445fa0 The buggy address belongs to the object at ffff88805d316b40 which belongs to the cache jfs_ip of size 2368 The buggy address is located 1636 bytes inside of allocated 2368-byte region [ffff88805d316b40, ffff88805d317480) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805d316b40 pfn:0x5d310 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805d317ec1 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff88801e31bc80 ffff88801e31ac88 ffff88801e31ac88 raw: ffff88805d316b40 00000008000d000b 00000000f5000000 ffff88805d317ec1 head: 0080000000000240 ffff88801e31bc80 ffff88801e31ac88 ffff88801e31ac88 head: ffff88805d316b40 00000008000d000b 00000000f5000000 ffff88805d317ec1 head: 0080000000000003 ffffea000174c401 00000000ffffffff 00000000ffffffff head: 0000000000000000 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 5981, tgid 5981 (syz.0.17), ts 112476010004, free_ts 100551819174 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3292 [inline] allocate_slab+0x77/0x660 mm/slub.c:3481 new_slab mm/slub.c:3539 [inline] refill_objects+0x334/0x3c0 mm/slub.c:7175 refill_sheaf mm/slub.c:2812 [inline] alloc_full_sheaf mm/slub.c:2834 [inline] __pcs_replace_empty_main+0x480/0x710 mm/slub.c:4626 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] kmem_cache_alloc_lru_noprof+0x433/0x680 mm/slub.c:4885 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x6a/0x1b0 fs/inode.c:347 iget_locked+0x131/0x6a0 fs/inode.c:1480 jfs_iget+0x24/0x470 fs/jfs/inode.c:29 jfs_fill_super+0x8ad/0xd80 fs/jfs/super.c:547 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694 vfs_get_tree+0x92/0x2a0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x341/0xd30 fs/namespace.c:3839 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4338 page last free pid 5862 tgid 5862 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xfe3/0x1170 mm/page_alloc.c:2978 vfree+0x2ac/0x470 mm/vmalloc.c:3479 kcov_put kernel/kcov.c:442 [inline] kcov_close+0x2e/0x60 kernel/kcov.c:543 __fput+0x461/0xa90 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x70f/0x23c0 kernel/exit.c:976 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118 get_signal+0x125c/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805d317080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805d317100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805d317180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805d317200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805d317280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================