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BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1248/0x37c0
Read of size 1 at addr ffff8881b47d91dd by task syz.1.2111/28251

CPU: 0 UID: 0 PID: 28251 Comm: syz.1.2111 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_create+0x75b/0xb10
 path_openat+0x1395/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f78a899c799
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:00007f78a9821028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f78a8c15fa0 RCX: 00007f78a899c799
RDX: 0000000000022042 RSI: 0000200000000180 RDI: ffffffffffffff9c
RBP: 00007f78a8a32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000fc R11: 0000000000000246 R12: 0000000000000000
R13: 00007f78a8c16038 R14: 00007f78a8c15fa0 R15: 00007ffc5d1c0928
 </TASK>

Allocated by task 28251:
 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 ffff8881b47d8928
 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 [ffff8881b47d8928, ffff8881b47d91d0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881b47db6f0 pfn:0x1b47d8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881b47df709
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88816044a780 ffff888160448b88 ffffea0006b10010
raw: ffff8881b47db6f0 00000008000d000b 00000000f5000000 ffff8881b47df709
head: 057ff00000000240 ffff88816044a780 ffff888160448b88 ffffea0006b10010
head: ffff8881b47db6f0 00000008000d000b 00000000f5000000 ffff8881b47df709
head: 057ff00000000003 ffffea0006d1f601 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 7473, tgid 7472 (syz.8.224), ts 123227299203, free_ts 112588362668
 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
 iget_locked+0x131/0x6a0
 jfs_iget+0x24/0x470
 jfs_fill_super+0x8ad/0xd80
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
page last free pid 6530 tgid 6530 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 __slab_free+0x263/0x2b0
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_lru_noprof+0x2b8/0x640
 sock_alloc_inode+0x28/0xc0
 alloc_inode+0x6a/0x1b0
 __sock_create+0x12d/0x9d0
 __sys_socket+0xd6/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8881b47d9080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b47d9100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881b47d9180: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                    ^
 ffff8881b47d9200: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00
 ffff8881b47d9280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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