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BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1248/0x37c0
Read of size 1 at addr ffff8881b17cd1f5 by task syz.9.1296/14037

CPU: 0 UID: 0 PID: 14037 Comm: syz.9.1296 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_report+0xba/0x230
 kasan_report+0x117/0x150
 dtSplitPage+0x1248/0x37c0
 dtInsert+0x10a4/0x5f10
 jfs_mkdir+0x783/0xb00
 vfs_mkdir+0x413/0x630
 filename_mkdirat+0x285/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb96239b607
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:00007fb963283e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fb963283ee0 RCX: 00007fb96239b607
RDX: 00000000000001ff RSI: 0000200000000200 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000200000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000200
R13: 00007fb963283ea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 14037:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x2b8/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0x131/0x6a0
 jfs_iget+0x24/0x470
 jfs_lookup+0x220/0x420
 __lookup_slow+0x2b7/0x410
 lookup_slow+0x53/0x70
 path_lookupat+0x3f5/0x8c0
 filename_lookup+0x256/0x5d0
 __se_sys_chdir+0xa8/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881b17cc940
 which belongs to the cache jfs_ip of size 2216
The buggy address is located 13 bytes to the right of
 allocated 2216-byte region [ffff8881b17cc940, ffff8881b17cd1e8)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881b17cede0 pfn:0x1b17c8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881b17cf709
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff8881604463c0 ffff888168540b88 ffffea0006c55a10
raw: ffff8881b17cede0 00000008000d000c 00000000f5000000 ffff8881b17cf709
head: 057ff00000000240 ffff8881604463c0 ffff888168540b88 ffffea0006c55a10
head: ffff8881b17cede0 00000008000d000c 00000000f5000000 ffff8881b17cf709
head: 057ff00000000003 ffffea0006c5f201 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 6721, tgid 6720 (syz.0.232), ts 88690237588, free_ts 25652654781
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x331/0x3c0
 __pcs_replace_empty_main+0x2e6/0x730
 kmem_cache_alloc_lru_noprof+0x37c/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 diReadSpecial+0x52/0x710
 jfs_mount+0x174/0x870
 jfs_fill_super+0x6bc/0xd80
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
page last free pid 1 tgid 1 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 free_contig_range+0xbb/0x170
 destroy_args+0x4e5/0x570
 debug_vm_pgtable+0x3f8/0x410
 do_one_initcall+0x250/0x8d0
 do_initcall_level+0x104/0x190
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x2a6/0x3e0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff8881b17cd080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b17cd100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881b17cd180: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
                                                             ^
 ffff8881b17cd200: fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb fb
 ffff8881b17cd280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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