read_mapping_page failed!
ERROR: (device loop8): txCommit: 
==================================================================
BUG: KASAN: slab-out-of-bounds in dtInsertEntry+0xe9a/0x1430
Read of size 4 at addr ffff888124865bc4 by task syz.8.3669/28462

CPU: 0 UID: 0 PID: 28462 Comm: syz.8.3669 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
 dtInsertEntry+0xe9a/0x1430
 dtSplitPage+0x2a83/0x3b20
 dtInsert+0x109b/0x5f40
 jfs_create+0x6c8/0xa80
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f57e578ebe9
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:00007f57e66d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f57e59c5fa0 RCX: 00007f57e578ebe9
RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f57e5811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f57e59c6038 R14: 00007f57e59c5fa0 R15: 00007ffe06b6b3a8
 </TASK>

Allocated by task 28462:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x1c6/0x3d0
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0xf0/0x570
 jfs_iget+0x24/0x3e0
 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/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881248652f8
 which belongs to the cache jfs_ip of size 2232
The buggy address is located 20 bytes to the right of
 allocated 2232-byte region [ffff8881248652f8, ffff888124865bb0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x124860
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88810f9cea01
ksm flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff8881060ef140 ffffea000492b600 0000000000000003
raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff88810f9cea01
head: 057ff00000000040 ffff8881060ef140 ffffea000492b600 0000000000000003
head: 0000000000000000 00000000800d000d 00000000f5000000 ffff88810f9cea01
head: 057ff00000000003 ffffea0004921801 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 6716, tgid 6715 (syz.0.155), ts 108448077889, free_ts 100754040182
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 kmem_cache_alloc_lru_noprof+0x288/0x3d0
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0xf0/0x570
 jfs_iget+0x24/0x3e0
 jfs_lookup+0x1c5/0x380
 path_openat+0x1101/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
page last free pid 6548 tgid 6547 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __slab_free+0x303/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x224/0x4f0
 __bch2_trans_get+0x711/0xd80
 __bch2_write+0x4b0/0x3900
 bch2_writepages+0x211/0x2d0
 do_writepages+0x32e/0x550
 file_write_and_wait_range+0x23e/0x340
 bch2_fsync+0x127/0x330
 bch2_write_iter+0x2822/0x2b90
 iter_file_splice_write+0x975/0x10e0
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x5a8/0xcc0

Memory state around the buggy address:
 ffff888124865a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888124865b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888124865b80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff888124865c00: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
 ffff888124865c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
