BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x12c6/0x3b20
Read of size 1 at addr ffff8881b680bfa5 by task syz.2.21/5961

CPU: 1 UID: 0 PID: 5961 Comm: syz.2.21 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+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 dtSplitPage+0x12c6/0x3b20
 dtInsert+0x109b/0x5f40
 jfs_create+0x6c8/0xa80
 path_openat+0x1941/0x3860
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_open+0x11e/0x150
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f88cdf8f6c9
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:00007f88cee54038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f88ce1e5fa0 RCX: 00007f88cdf8f6c9
RDX: 389b0d52417bb201 RSI: 0000000000064842 RDI: 00002000000005c0
RBP: 00007f88ce011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f88ce1e6038 R14: 00007f88ce1e5fa0 R15: 00007ffcb848d7f8
 </TASK>

Allocated by task 5961:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x36c/0x6e0
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0x135/0x6c0
 jfs_iget+0x24/0x470
 jfs_lookup+0x1c5/0x380
 __lookup_slow+0x297/0x3d0
 lookup_slow+0x53/0x70
 walk_component+0x2d2/0x400
 path_lookupat+0x163/0x430
 filename_lookup+0x212/0x570
 user_path_at+0x3a/0x60
 __se_sys_chdir+0x91/0x280
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881b680b6f0
 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 [ffff8881b680b6f0, ffff8881b680bf98)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b6808
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88816d365d01
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff888106e833c0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff88816d365d01
head: 057ff00000000040 ffff888106e833c0 dead000000000122 0000000000000000
head: 0000000000000000 00000000800d000d 00000000f5000000 ffff88816d365d01
head: 057ff00000000003 ffffea0006da0201 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 5961, tgid 5960 (syz.2.21), ts 69414844399, free_ts 25141082633
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x2365/0x2440
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x96/0x350
 ___slab_alloc+0xf56/0x1990
 __slab_alloc+0x65/0x100
 kmem_cache_alloc_lru_noprof+0x3fe/0x6e0
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 jfs_fill_super+0x569/0xd80
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x302/0xa10
 __se_sys_mount+0x313/0x410
page last free pid 1 tgid 1 stack trace:
 __free_frozen_pages+0xbc8/0xd30
 free_contig_range+0x1bd/0x4a0
 destroy_args+0x69/0x660
 debug_vm_pgtable+0x38f/0x3a0
 do_one_initcall+0x1fb/0x870
 do_initcall_level+0x104/0x190
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x334/0x4b0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x599/0xb30
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff8881b680be80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b680bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881b680bf80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8881b680c000: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b680c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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