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BUG: KASAN: use-after-free in debugfs_remove+0x10d/0x130 fs/debugfs/inode.c:690
Read of size 8 at addr ffff8880979eb880 by task kworker/0:3/7799
CPU: 0 PID: 7799 Comm: kworker/0:3 Not tainted 5.1.0-rc6+ #87
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+0x7c/0x20d mm/kasan/report.c:187
kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
debugfs_remove+0x10d/0x130 fs/debugfs/inode.c:690
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:753
__blk_release_queue+0x1dc/0x3a0 block/blk-sysfs.c:866
process_one_work+0x98e/0x1790 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x357/0x430 kernel/kthread.c:253
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Allocated by task 10693:
save_stack+0x45/0xd0 mm/kasan/common.c:75
set_track mm/kasan/common.c:87 [inline]
__kasan_kmalloc mm/kasan/common.c:497 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505
slab_post_alloc_hook mm/slab.h:437 [inline]
slab_alloc mm/slab.c:3393 [inline]
kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3555
__d_alloc+0x2e/0x8c0 fs/dcache.c:1622
d_alloc+0x4d/0x2b0 fs/dcache.c:1701
d_alloc_parallel+0xf4/0x1bc0 fs/dcache.c:2449
__lookup_slow+0x1ab/0x500 fs/namei.c:1652
lookup_one_len+0x16d/0x1a0 fs/namei.c:2541
start_creating fs/debugfs/inode.c:313 [inline]
start_creating+0xbf/0x1e0 fs/debugfs/inode.c:289
__debugfs_create_file+0x65/0x400 fs/debugfs/inode.c:352
debugfs_create_file+0x5a/0x70 fs/debugfs/inode.c:405
do_blk_trace_setup+0x376/0xb90 kernel/trace/blktrace.c:528
__blk_trace_setup+0xe3/0x190 kernel/trace/blktrace.c:577
blk_trace_ioctl+0x170/0x300 kernel/trace/blktrace.c:716
blkdev_ioctl+0x276/0x1d10 block/ioctl.c:591
block_ioctl+0xee/0x130 fs/block_dev.c:1933
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 16:
save_stack+0x45/0xd0 mm/kasan/common.c:75
set_track mm/kasan/common.c:87 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
__cache_free mm/slab.c:3499 [inline]
kmem_cache_free+0x86/0x260 mm/slab.c:3765
__d_free+0x20/0x30 fs/dcache.c:269
__rcu_reclaim kernel/rcu/rcu.h:227 [inline]
rcu_do_batch kernel/rcu/tree.c:2475 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2788 [inline]
rcu_core+0x916/0x13a0 kernel/rcu/tree.c:2769
__do_softirq+0x266/0x95a kernel/softirq.c:293
The buggy address belongs to the object at ffff8880979eb840
which belongs to the cache dentry(33:syz1) of size 288
The buggy address is located 64 bytes inside of
288-byte region [ffff8880979eb840, ffff8880979eb960)
The buggy address belongs to the page:
page:ffffea00025e7ac0 count:1 mapcount:0 mapping:ffff88808b71b900 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002142948 ffffea00025e7f88 ffff88808b71b900
raw: 0000000000000000 ffff8880979eb000 000000010000000b ffff88809f1dc980
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88809f1dc980
Memory state around the buggy address:
ffff8880979eb780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880979eb800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880979eb880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880979eb900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8880979eb980: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
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