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BUG: KASAN: slab-out-of-bounds in dtMoveEntry fs/jfs/jfs_dtree.c:3931 [inline]
BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1cc3/0x36a0 fs/jfs/jfs_dtree.c:1558
Write of size 1 at addr ffff888057789080 by task syz.7.111/6799

CPU: 0 UID: 0 PID: 6799 Comm: syz.7.111 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 dtMoveEntry fs/jfs/jfs_dtree.c:3931 [inline]
 dtSplitPage+0x1cc3/0x36a0 fs/jfs/jfs_dtree.c:1558
 dtSplitUp fs/jfs/jfs_dtree.c:1089 [inline]
 dtInsert+0x1081/0x5cd0 fs/jfs/jfs_dtree.c:868
 jfs_mknod+0x6bd/0x9d0 fs/jfs/namei.c:1413
 vfs_mknod+0x44e/0x620 fs/namei.c:5120
 filename_mknodat+0x3cf/0x670 fs/namei.c:-1
 __do_sys_mknod fs/namei.c:5207 [inline]
 __se_sys_mknod+0x3a/0x150 fs/namei.c:5204
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8c5884c819
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:00007f8c56a9e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f8c58ac5fa0 RCX: 00007f8c5884c819
RDX: 000000000000070f RSI: 0000000000001000 RDI: 0000200000000080
RBP: 00007f8c588e2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8c58ac6038 R14: 00007f8c58ac5fa0 R15: 00007ffd28da16c8
 </TASK>

Allocated by task 6654:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4569 [inline]
 slab_alloc_node mm/slub.c:4898 [inline]
 kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4905
 ptlock_alloc mm/memory.c:7563 [inline]
 ptlock_init include/linux/mm.h:3736 [inline]
 pmd_ptlock_init include/linux/mm.h:3848 [inline]
 pagetable_pmd_ctor include/linux/mm.h:3876 [inline]
 pmd_alloc_one_noprof include/asm-generic/pgalloc.h:146 [inline]
 __pmd_alloc+0xa4/0x5e0 mm/memory.c:6804
 pmd_alloc include/linux/mm.h:3562 [inline]
 copy_pmd_range+0x510f/0x5550 mm/memory.c:1372
 copy_pud_range mm/memory.c:1429 [inline]
 copy_p4d_range mm/memory.c:1453 [inline]
 copy_page_range+0xaf4/0x1120 mm/memory.c:1539
 dup_mmap+0xf4c/0x1d50 mm/mmap.c:1840
 dup_mm kernel/fork.c:1534 [inline]
 copy_mm+0x13b/0x4a0 kernel/fork.c:1586
 copy_process+0x1f24/0x4460 kernel/fork.c:2262
 kernel_clone+0x283/0x870 kernel/fork.c:2723
 __do_sys_clone kernel/fork.c:2864 [inline]
 __se_sys_clone kernel/fork.c:2848 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2848
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888057789000
 which belongs to the cache page->ptl of size 128
The buggy address is located 0 bytes to the right of
 allocated 128-byte region [ffff888057789000, ffff888057789080)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x57789
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88801a03c780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800150015 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5796, tgid 5796 (syz-executor), ts 91223573274, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1860
 prep_new_page mm/page_alloc.c:1868 [inline]
 get_page_from_freelist+0x27c8/0x2840 mm/page_alloc.c:3948
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5228
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3467
 new_slab mm/slub.c:3525 [inline]
 refill_objects+0x33c/0x3d0 mm/slub.c:7251
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4651
 alloc_from_pcs mm/slub.c:4749 [inline]
 slab_alloc_node mm/slub.c:4883 [inline]
 kmem_cache_alloc_noprof+0x433/0x680 mm/slub.c:4905
 ptlock_alloc+0x20/0x70 mm/memory.c:7563
 ptlock_init include/linux/mm.h:3736 [inline]
 pagetable_pte_ctor include/linux/mm.h:3785 [inline]
 __pte_alloc_one_noprof include/asm-generic/pgalloc.h:79 [inline]
 pte_alloc_one+0x7e/0x380 arch/x86/mm/pgtable.c:18
 __pte_alloc+0x25/0x1a0 mm/memory.c:453
 copy_pte_range mm/memory.c:1237 [inline]
 copy_pmd_range+0x4c75/0x5550 mm/memory.c:1392
 copy_pud_range mm/memory.c:1429 [inline]
 copy_p4d_range mm/memory.c:1453 [inline]
 copy_page_range+0xaf4/0x1120 mm/memory.c:1539
 dup_mmap+0xf4c/0x1d50 mm/mmap.c:1840
 dup_mm kernel/fork.c:1534 [inline]
 copy_mm+0x13b/0x4a0 kernel/fork.c:1586
 copy_process+0x1f24/0x4460 kernel/fork.c:2262
 kernel_clone+0x283/0x870 kernel/fork.c:2723
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888057788f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888057789000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888057789080: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
                   ^
 ffff888057789100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888057789180: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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