BUG: Dentry 00000000e6e0ec57{i=0,n=.index} still in use (1) [unmount of vfat loop1] ------------[ cut here ]------------ WARNING: CPU: 0 PID: 362 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 362 Comm: syz-executor.1 Not tainted 5.4.88-syzkaller-00116-gc9951e5d80dd #0 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+0x1dd/0x24e lib/dump_stack.c:118 panic+0x285/0x750 kernel/panic.c:221 __warn+0x1fd/0x200 kernel/panic.c:582 report_bug+0x390/0x4d0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:179 [inline] do_error_trap arch/x86/kernel/traps.c:272 [inline] do_invalid_op+0x6e/0x110 arch/x86/kernel/traps.c:291 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:1029 RIP: 0010:umount_check+0x179/0x1c0 fs/dcache.c:1588 Code: ff 4c 8b 0b 48 81 c5 20 04 00 00 48 c7 c7 c3 48 1d 85 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 47 4e b0 ff 48 83 c4 08 <0f> 0b e9 fd fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c d4 fe ff RSP: 0018:ffff8881ab7bfc60 EFLAGS: 00010296 RAX: 0000000000000054 RBX: ffffffff8548cd70 RCX: c2cb6e852f67cb00 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8881eae3b420 R08: ffffffff814e3ed1 R09: ffffed103ee05e08 R10: ffffed103ee05e08 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881e90c2aa0 d_walk+0x2e9/0x570 fs/dcache.c:1307 do_one_tree fs/dcache.c:1604 [inline] shrink_dcache_for_umount+0x8a/0x1b0 fs/dcache.c:1620 generic_shutdown_super+0x63/0x2a0 fs/super.c:447 kill_block_super+0x79/0xd0 fs/super.c:1444 deactivate_locked_super+0xaf/0x100 fs/super.c:335 deactivate_super+0x1b8/0x280 fs/super.c:366 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102 task_work_run+0x176/0x1a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:163 [inline] prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460c47 Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffeaf224828 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000bb8 RCX: 0000000000460c47 RDX: 00000000004033a8 RSI: 0000000000000002 RDI: 00007ffeaf2248d0 RBP: 00000000000d4e2b R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffeaf225980 R13: 00000000022b0940 R14: 0000000000000000 R15: 00000000000d4d63 Kernel Offset: disabled Rebooting in 86400 seconds..