BUG: Dentry ffff8881199a4770{i=0,n=.index} still in use (1) [unmount of ext4 loop0] ------------[ cut here ]------------ WARNING: CPU: 1 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0 fs/dcache.c:1607 Modules linked in: CPU: 1 PID: 366 Comm: syz-executor547 Not tainted 5.10.75-syzkaller-01082-g234d53d2bb60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:umount_check+0x18d/0x1d0 fs/dcache.c:1607 Code: 8b 0b 49 81 c6 f8 03 00 00 48 c7 c7 40 43 2e 85 4c 89 e6 48 8b 55 d0 4c 89 e1 45 89 f8 31 c0 41 56 e8 ae d9 9e ff 48 83 c4 08 <0f> 0b e9 f1 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c c9 fe ff RSP: 0018:ffffc9000028fab8 EFLAGS: 00010286 RAX: 0000000000000054 RBX: ffffffff86690d40 RCX: ad9b5f8aa6b09900 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc9000028fae8 R08: ffffffff81545368 R09: 0000000000000003 R10: fffff52000051ea9 R11: 0000000000000004 R12: ffff8881199a4770 R13: dffffc0000000000 R14: ffff88811d4293f8 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559638860bc0 CR3: 000000010c32b000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: d_walk+0x309/0x540 fs/dcache.c:1326 do_one_tree fs/dcache.c:1623 [inline] shrink_dcache_for_umount+0x8e/0x1b0 fs/dcache.c:1639 generic_shutdown_super+0x66/0x2c0 fs/super.c:447 kill_block_super+0x80/0xe0 fs/super.c:1446 deactivate_locked_super+0xb0/0x100 fs/super.c:335 deactivate_super+0xa5/0xd0 fs/super.c:366 cleanup_mnt+0x45f/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x147/0x1b0 kernel/task_work.c:154 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0x70e/0x23a0 kernel/exit.c:813 do_group_exit+0x16a/0x2d0 kernel/exit.c:910 __do_sys_exit_group+0x17/0x20 kernel/exit.c:921 __se_sys_exit_group+0x14/0x20 kernel/exit.c:919 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:919 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fa0992ea0a9 Code: Unable to access opcode bytes at RIP 0x7fa0992ea07f. RSP: 002b:00007fff8b922a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fa09935e330 RCX: 00007fa0992ea0a9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007fa099358e40 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa09935e330 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 ---[ end trace 1aa5d271f17b63c0 ]--- VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds. Have a nice day...