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BUG: KASAN: use-after-free in dtSplitPage+0x1bce/0x36a0
Write of size 1 at addr ffff888110479000 by task syz.8.1355/13379

CPU: 0 UID: 0 PID: 13379 Comm: syz.8.1355 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_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 dtSplitPage+0x1bce/0x36a0
 dtInsert+0x1080/0x5cb0
 jfs_rename+0x89d/0x1870
 vfs_rename+0xbd9/0xef0
 filename_renameat2+0x533/0x9a0
 __se_sys_rename+0x55/0x2c0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f44fc59e0d9
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:00007f44fd49c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f44fc825fa0 RCX: 00007f44fc59e0d9
RDX: 0000000000000000 RSI: 0000200000000f40 RDI: 00002000000003c0
RBP: 00007f44fc635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f44fc826038 R14: 00007f44fc825fa0 R15: 00007ffdfe59b1d8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888110479000 pfn:0x110479
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 017ff00000000000 ffffea0004780988 ffffea00045b9888 0000000000000000
raw: ffff888110479000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12950, tgid 12950 (dhcpcd), ts 293881362696, free_ts 298139383422
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x21fa/0x2270
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x79/0x5e0
 refill_objects+0x2d5/0x350
 __pcs_replace_empty_main+0x2bf/0x6b0
 __kmalloc_cache_noprof+0x3a7/0x660
 dummy_urb_enqueue+0x7c/0x780
 usb_hcd_submit_urb+0x328/0x1b60
 ath9k_hif_usb_reg_in_cb+0x4d5/0x6f0
 __usb_hcd_giveback_urb+0x374/0x530
 dummy_timer+0xa91/0x4cf0
 __hrtimer_run_queues+0x3bc/0xa10
 hrtimer_run_softirq+0x17a/0x240
 handle_softirqs+0x225/0x840
 do_softirq+0x76/0xd0
page last free pid 5049 tgid 5049 stack trace:
 __free_frozen_pages+0xc1e/0xd10
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2a0/0x5f0
 do_getname+0x2e/0x250
 do_sys_openat2+0xcc/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888110478f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888110478f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888110479000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888110479080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888110479100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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