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BUG: KASAN: use-after-free in debugfs_remove+0x10d/0x130 fs/debugfs/inode.c:705
Read of size 8 at addr ffff8880951284a0 by task kworker/1:0/16826

CPU: 1 PID: 16826 Comm: kworker/1:0 Not tainted 5.3.0-rc5+ #116
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events __blk_release_queue
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
 kasan_report+0x12/0x17 mm/kasan/common.c:612
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 debugfs_remove+0x10d/0x130 fs/debugfs/inode.c:705
 blk_trace_free+0x38/0x140 kernel/trace/blktrace.c:312
 blk_trace_cleanup kernel/trace/blktrace.c:339 [inline]
 __blk_trace_remove+0x78/0xa0 kernel/trace/blktrace.c:352
 blk_trace_shutdown+0x67/0x90 kernel/trace/blktrace.c:747
 __blk_release_queue+0x219/0x380 block/blk-sysfs.c:905
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 28640:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495
 slab_post_alloc_hook mm/slab.h:520 [inline]
 slab_alloc mm/slab.c:3319 [inline]
 kmem_cache_alloc+0x121/0x710 mm/slab.c:3483
 __d_alloc+0x2e/0x8c0 fs/dcache.c:1688
 d_alloc+0x4d/0x280 fs/dcache.c:1767
 d_alloc_parallel+0xf4/0x1c30 fs/dcache.c:2519
 lookup_open+0x525/0x1a50 fs/namei.c:3145
 do_last fs/namei.c:3322 [inline]
 path_openat+0x1e94/0x4630 fs/namei.c:3533
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 fs/open.c:1089
 __do_compat_sys_open fs/open.c:1126 [inline]
 __se_compat_sys_open fs/open.c:1124 [inline]
 __ia32_compat_sys_open+0x79/0xb0 fs/open.c:1124
 do_syscall_32_irqs_on arch/x86/entry/common.c:332 [inline]
 do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:403
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 9691:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
 __cache_free mm/slab.c:3425 [inline]
 kmem_cache_free+0x86/0x320 mm/slab.c:3693
 __d_free+0x20/0x30 fs/dcache.c:271
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2114 [inline]
 rcu_core+0x67f/0x1580 kernel/rcu/tree.c:2314
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323
 __do_softirq+0x262/0x98c kernel/softirq.c:292

The buggy address belongs to the object at ffff888095128460
 which belongs to the cache dentry(17:syz0) of size 288
The buggy address is located 64 bytes inside of
 288-byte region [ffff888095128460, ffff888095128580)
The buggy address belongs to the page:
page:ffffea0002544a00 refcount:1 mapcount:0 mapping:ffff88809b612700 index:0xffff888095128460
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00024b8a08 ffffea00018b7dc8 ffff88809b612700
raw: ffff888095128460 ffff888095128040 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888095128380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888095128400: fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb
>ffff888095128480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888095128500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888095128580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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