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BUG: KASAN: slab-use-after-free in dtSplitPage+0x1248/0x37c0
Read of size 1 at addr ffff888117b9a4ad by task syz.7.323/8445

CPU: 1 UID: 0 PID: 8445 Comm: syz.7.323 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+0x107a/0x5de0
 jfs_create+0x75b/0xb10
 path_openat+0x18dd/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe041d9acb9
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:00007fe03fbb2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe042016270 RCX: 00007fe041d9acb9
RDX: 0000000000105042 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007fe041e08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001db R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe042016308 R14: 00007fe042016270 R15: 00007ffc474eac08
 </TASK>

Allocated by task 6003:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x35f/0x6c0
 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+0x329/0xa50
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0xe2/0xf80
 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+0x195/0x610
 rcu_core+0xc9e/0x1750
 handle_softirqs+0x22a/0x7c0
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x541/0xa50
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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
 evict_inodes+0x75a/0x7f0
 generic_shutdown_super+0x9a/0x2c0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888117b9a4a0
 which belongs to the cache jfs_ip of size 2216
The buggy address is located 13 bytes inside of
 freed 2216-byte region [ffff888117b9a4a0, ffff888117b9ad48)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888117b9c018 pfn:0x117b98
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88823c5a4f81
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff888166fe73c0 dead000000000122 0000000000000000
raw: ffff888117b9c018 00000000800d000c 00000000f5000000 ffff88823c5a4f81
head: 017ff00000000040 ffff888166fe73c0 dead000000000122 0000000000000000
head: ffff888117b9c018 00000000800d000c 00000000f5000000 ffff88823c5a4f81
head: 017ff00000000003 ffffea00045ee601 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 6003, tgid 6002 (syz.0.21), ts 68483788278, free_ts 0
 post_alloc_hook+0x228/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x86/0x3a0
 ___slab_alloc+0xd82/0x1760
 __slab_alloc+0x65/0x100
 kmem_cache_alloc_lru_noprof+0x3ed/0x6c0
 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+0x329/0xa50
 __se_sys_mount+0x31d/0x420
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888117b9a380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888117b9a400: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888117b9a480: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888117b9a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888117b9a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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