VFS: Busy inodes after unmount of loop4 (btrfs) ------------[ cut here ]------------ kernel BUG at fs/super.c:700! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5103 Comm: syz-executor.4 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:generic_shutdown_super+0x2bd/0x2c0 fs/super.c:698 Code: 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e6 94 ef ff 48 8b 13 48 c7 c7 80 9c 77 8b 4c 89 e6 e8 94 65 19 09 90 <0f> 0b 90 66 0f 1f 00 41 57 41 56 53 49 89 fe 49 bf 00 00 00 00 00 RSP: 0018:ffffc900046c7ce8 EFLAGS: 00010246 RAX: 000000000000002f RBX: ffffffff8de4e580 RCX: ba5fce0cc3655e00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 1ffff110054644eb R08: ffffffff8171379c R09: 1ffff920008d8f3c R10: dffffc0000000000 R11: fffff520008d8f3d R12: ffff88802a322660 R13: dffffc0000000000 R14: ffffffff8baa9898 R15: ffff88802a322758 FS: 0000555557494480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff2af86d3b0 CR3: 000000001ef11000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kill_anon_super+0x3b/0x70 fs/super.c:1295 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2100 deactivate_locked_super+0xc1/0x130 fs/super.c:484 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f2be907de17 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc834c17b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f2be907de17 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc834c1870 RBP: 00007ffc834c1870 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc834c2930 R13: 00007f2be90c73b9 R14: 000000000006b7f9 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:generic_shutdown_super+0x2bd/0x2c0 fs/super.c:698 Code: 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e6 94 ef ff 48 8b 13 48 c7 c7 80 9c 77 8b 4c 89 e6 e8 94 65 19 09 90 <0f> 0b 90 66 0f 1f 00 41 57 41 56 53 49 89 fe 49 bf 00 00 00 00 00 RSP: 0018:ffffc900046c7ce8 EFLAGS: 00010246 RAX: 000000000000002f RBX: ffffffff8de4e580 RCX: ba5fce0cc3655e00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 1ffff110054644eb R08: ffffffff8171379c R09: 1ffff920008d8f3c R10: dffffc0000000000 R11: fffff520008d8f3d R12: ffff88802a322660 R13: dffffc0000000000 R14: ffffffff8baa9898 R15: ffff88802a322758 FS: 0000555557494480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffdac5da38 CR3: 000000001ef11000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400