ERROR: (device loop2): txCommit: 
read_mapping_page failed!
ERROR: (device loop2): txCommit: 
==================================================================
BUG: KASAN: slab-use-after-free in dtSplitPage+0x1248/0x37c0
Read of size 1 at addr ffff8881a9c724ad by task syz.2.8/5936

CPU: 1 UID: 0 PID: 5936 Comm: syz.2.8 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_creat+0x8f/0xc0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47b219c799
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:00007f47b2fe7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f47b2415fa0 RCX: 00007f47b219c799
RDX: 0000000000000000 RSI: 0000000000000032 RDI: 00002000000004c0
RBP: 00007f47b2232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47b2416038 R14: 00007f47b2415fa0 R15: 00007ffebf8fd9d8
 </TASK>

Allocated by task 5936:
 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
 new_inode+0x22/0x170
 ialloc+0x4c/0x8f0
 jfs_mkdir+0x1e1/0xb00
 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

Freed by task 23:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kmem_cache_free+0x187/0x630
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x870
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x541/0xa50
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 evict+0x95b/0xb10
 jfs_mkdir+0x50a/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

The buggy address belongs to the object at ffff8881a9c724a0
 which belongs to the cache jfs_ip of size 2216
The buggy address is located 13 bytes inside of
 freed 2216-byte region [ffff8881a9c724a0, ffff8881a9c72d48)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881a9c76de0 pfn:0x1a9c70
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881a9c77709
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff888102bd6280 ffff888168c12b88 ffff888168c12b88
raw: ffff8881a9c76de0 00000008000d000c 00000000f5000000 ffff8881a9c77709
head: 057ff00000000240 ffff888102bd6280 ffff888168c12b88 ffff888168c12b88
head: ffff8881a9c76de0 00000008000d000c 00000000f5000000 ffff8881a9c77709
head: 057ff00000000003 ffffea0006a71c01 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 5936, tgid 5935 (syz.2.8), ts 67834363832, free_ts 25718947083
 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+0x40a/0x730
 kmem_cache_alloc_lru_noprof+0x37c/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 jfs_fill_super+0x569/0xd80
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x14d/0xf80
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:
 ffff8881a9c72380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881a9c72400: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881a9c72480: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8881a9c72500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881a9c72580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
