BUG: Dentry 00000000cb28573b{i=0,n=.index} still in use (1) [unmount of msdos loop5] ------------[ cut here ]------------ WARNING: CPU: 1 PID: 358 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 358 Comm: syz-executor.5 Not tainted 5.4.98-syzkaller-00277-g0cd79a8750fa #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+0x1d8/0x24e lib/dump_stack.c:118 panic+0x285/0x740 kernel/panic.c:221 report_bug+0x380/0x4d0 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 00 ca e8 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 87 43 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:ffff8881bb627c58 EFLAGS: 00010282 RAX: 0000000000000055 RBX: ffffffff85fc4f20 RCX: 3f79e02a185f7400 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8881e439f420 R08: ffffffff814e6147 R09: ffffed103ede5e08 R10: ffffed103ede5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881e8957aa0 d_walk+0x2d9/0x540 fs/dcache.c:1307 do_one_tree fs/dcache.c:1604 [inline] shrink_dcache_for_umount+0x8a/0x1a0 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+0x1b3/0x270 fs/super.c:366 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102 task_work_run+0x186/0x1b0 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: 0033:0x4671f7 Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffde3e91bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004671f7 RDX: 00007ffde3e91cc9 RSI: 0000000000000002 RDI: 00007ffde3e91cc0 RBP: 00007ffde3e91cc0 R08: 00000000ffffffff R09: 00007ffde3e91a90 R10: 000000000299678b R11: 0000000000000246 R12: 00000000004bbd54 R13: 00007ffde3e92d90 R14: 00000000029966f0 R15: 00007ffde3e92dd0 Kernel Offset: disabled Rebooting in 86400 seconds..