loop7: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: use-after-free in dtSplitPage+0x1bce/0x36a0
Write of size 1 at addr ffff8880439f4000 by task syz.7.13258/9871

CPU: 0 UID: 0 PID: 9871 Comm: syz.7.13258 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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_symlink+0x8a1/0xfb0
 vfs_symlink+0x18b/0x330
 filename_symlinkat+0x1cd/0x410
 __se_sys_symlinkat+0x4e/0x2b0
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f72fef9e159
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:00007f72ffe90028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f72ff225fa0 RCX: 00007f72fef9e159
RDX: 00002000000005c0 RSI: ffffffffffffff9c RDI: 0000200000000700
RBP: 00007f72ff03506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f72ff226038 R14: 00007f72ff225fa0 R15: 00007ffe726b6608
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880439f4000 pfn:0x439f4
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea0000dc4988 ffffea00010b7488 0000000000000000
raw: ffff8880439f4000 0000000000000001 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2880(GFP_NOWAIT|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9196, tgid 9195 (syz.7.12964), ts 1783899013968
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x2209/0x2280
 __alloc_frozen_pages_noprof+0x217/0x5a0
 allocate_slab+0x7d/0x620
 refill_objects+0x2d5/0x350
 __pcs_replace_empty_main+0x2c8/0x6c0
 kmem_cache_alloc_noprof+0x399/0x600
 bio_alloc_bioset+0x1cf/0xc60
 iomap_dio_bio_iter+0xaaa/0x1a20
 __iomap_dio_rw+0xf24/0x1c40
 iomap_dio_rw+0x45/0xb0
 ntfs_file_write_iter+0x7bb/0xab0
 iter_file_splice_write+0xa31/0x1240
 direct_splice_actor+0x101/0x160
 splice_direct_to_actor+0x57b/0xcb0
 do_splice_direct+0x195/0x290
page last free pid 3 tgid 3 ts 1792629847074 stack trace:
 __free_frozen_pages+0xc93/0xd90
 rcu_core+0x926/0x1260
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20

Memory state around the buggy address:
 ffff8880439f3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880439f3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880439f4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8880439f4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880439f4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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