R13: 0000000020000080 R14: 0000000000000000 R15: 0000000000000000 QAT: Invalid ioctl print_req_error: I/O error, dev loop199, sector 2 hfsplus: unable to find HFS+ superblock ================================================================== BUG: KASAN: use-after-free in debugfs_remove+0x10b/0x130 fs/debugfs/inode.c:682 Read of size 8 at addr ffff8801b2be1380 by task syz-executor6/10824 CPU: 1 PID: 10824 Comm: syz-executor6 Not tainted 4.17.0-rc1+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 debugfs_remove+0x10b/0x130 fs/debugfs/inode.c:682 bdi_debug_unregister mm/backing-dev.c:127 [inline] bdi_unregister+0x606/0x8e0 mm/backing-dev.c:934 release_bdi mm/backing-dev.c:951 [inline] kref_put include/linux/kref.h:70 [inline] bdi_put+0x153/0x180 mm/backing-dev.c:960 generic_shutdown_super+0x3c2/0x520 fs/super.c:457 kill_anon_super+0x3c/0x50 fs/super.c:1036 fuse_kill_sb_anon+0x90/0xb0 fs/fuse/inode.c:1205 deactivate_locked_super+0x97/0x100 fs/super.c:316 deactivate_super+0x188/0x1b0 fs/super.c:347 cleanup_mnt+0xbf/0x160 fs/namespace.c:1174 __cleanup_mnt+0x16/0x20 fs/namespace.c:1181 task_work_run+0x1e4/0x290 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1aee/0x2730 kernel/exit.c:865 do_group_exit+0x16f/0x430 kernel/exit.c:968 __do_sys_exit_group kernel/exit.c:979 [inline] __se_sys_exit_group kernel/exit.c:977 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455389 RSP: 002b:00007fff28940e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000006b RCX: 0000000000455389 RDX: 000000000040f380 RSI: 0000000000a44bd0 RDI: 0000000000000045 RBP: 00000000004b9ed5 R08: 000000000000000d R09: 0000000000000000 R10: 000000000297f940 R11: 0000000000000246 R12: 0000000002980940 R13: 0000000000000000 R14: 00000000000000fe R15: 0000000000094af1 Allocated by task 11096: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 __d_alloc+0xc0/0xd30 fs/dcache.c:1638 d_alloc+0x8e/0x370 fs/dcache.c:1722 d_alloc_parallel+0x152/0x1e80 fs/dcache.c:2497 __lookup_slow+0x1e6/0x540 fs/namei.c:1613 lookup_one_len+0x1c7/0x210 fs/namei.c:2490 start_creating+0xc6/0x200 fs/debugfs/inode.c:308 debugfs_create_dir+0x23/0x3c0 fs/debugfs/inode.c:505 bdi_debug_register mm/backing-dev.c:110 [inline] bdi_register_va.part.10+0x318/0x970 mm/backing-dev.c:875 bdi_register_va+0x68/0x80 mm/backing-dev.c:884 super_setup_bdi_name+0x123/0x220 fs/super.c:1319 fuse_bdi_init fs/fuse/inode.c:987 [inline] fuse_fill_super+0xe6e/0x1e20 fs/fuse/inode.c:1110 mount_nodev+0x6b/0x110 fs/super.c:1210 fuse_mount+0x2c/0x40 fs/fuse/inode.c:1192 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11095: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 __d_free+0x20/0x30 fs/dcache.c:257 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2675 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline] rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801b2be1340 which belongs to the cache dentry(17:syz6) of size 288 The buggy address is located 64 bytes inside of 288-byte region [ffff8801b2be1340, ffff8801b2be1460) The buggy address belongs to the page: page:ffffea0006caf840 count:1 mapcount:0 mapping:ffff8801b2be1080 index:0xffff8801b2be1a20 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801b2be1080 ffff8801b2be1a20 0000000100000002 raw: ffffea000726f320 ffffea0007267820 ffff8801afc09cc0 ffff8801b1dfab80 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801b1dfab80 Memory state around the buggy address: ffff8801b2be1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b2be1300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8801b2be1380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b2be1400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801b2be1480: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================