BUG: Dentry ffff8881ecbc7220{i=0,n=.index} still in use (1) [unmount of msdos loop0] ------------[ cut here ]------------ WARNING: CPU: 1 PID: 344 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Modules linked in: CPU: 1 PID: 344 Comm: syz-executor766 Not tainted 5.4.125-syzkaller-00008-ga8f2bcabf9c5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 a0 0b e9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 37 a2 af 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:ffff8881dafbf738 EFLAGS: 00010282 RAX: 0000000000000055 RBX: ffffffff85fc6160 RCX: ef497dcce1bf9000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8881f34f6420 R08: ffffffff814e90d7 R09: ffffed103ede9608 R10: ffffed103ede9608 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881ecbc7220 FS: 00007f49c6d68700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004d15c0 CR3: 0000000005e0e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xcb9/0x2bf0 kernel/exit.c:812 do_group_exit+0x15c/0x2c0 kernel/exit.c:910 get_signal+0x164f/0x1fc0 kernel/signal.c:2745 do_signal+0x8d/0x610 arch/x86/kernel/signal.c:793 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x207/0x310 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x449f29 Code: Bad RIP value. RSP: 002b:00007f49c6d68308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000004cb418 RCX: 0000000000449f29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cb418 RBP: 00000000004cb410 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cb41c R13: 0030656c69662f2e R14: 6e656d6572636e69 R15: 0000000000022000 ---[ end trace d8bed598702355c6 ]--- WARNING: CPU: 1 PID: 344 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Modules linked in: CPU: 1 PID: 344 Comm: syz-executor766 Tainted: G W 5.4.125-syzkaller-00008-ga8f2bcabf9c5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 a0 0b e9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 37 a2 af 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:ffff8881dafbf738 EFLAGS: 00010282 RAX: 0000000000000055 RBX: ffffffff85fc6160 RCX: ef497dcce1bf9000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffff8881f34f6420 R08: ffffffff814e90d7 R09: ffffed103ede9608 R10: ffffed103ede9608 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881ecbc7220 FS: 00007f49c6d68700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000449eff CR3: 00000001ee1a9000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xcb9/0x2bf0 kernel/exit.c:812 do_group_exit+0x15c/0x2c0 kernel/exit.c:910 get_signal+0x164f/0x1fc0 kernel/signal.c:2745 do_signal+0x8d/0x610 arch/x86/kernel/signal.c:793 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x207/0x310 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x449f29 Code: Bad RIP value. RSP: 002b:00007f49c6d68308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000004cb418 RCX: 0000000000449f29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cb418 RBP: 00000000004cb410 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cb41c R13: 0030656c69662f2e R14: 6e656d6572636e69 R15: 0000000000022000 ---[ end trace d8bed598702355c7 ]--- ---------------- Code disassembly (best guess): 0: ff 4c 8b 0b decl 0xb(%rbx,%rcx,4) 4: 48 81 c5 20 04 00 00 add $0x420,%rbp b: 48 c7 c7 a0 0b e9 84 mov $0xffffffff84e90ba0,%rdi 12: 4c 89 fe mov %r15,%rsi 15: 4c 89 f2 mov %r14,%rdx 18: 4c 89 f9 mov %r15,%rcx 1b: 45 89 e8 mov %r13d,%r8d 1e: 31 c0 xor %eax,%eax 20: 55 push %rbp 21: e8 37 a2 af ff callq 0xffafa25d 26: 48 83 c4 08 add $0x8,%rsp 2a: 0f 0b ud2 <-- trapping instruction 2c: e9 fd fe ff ff jmpq 0xffffff2e 31: 89 e9 mov %ebp,%ecx 33: 80 e1 07 and $0x7,%cl 36: 80 c1 03 add $0x3,%cl 39: 38 c1 cmp %al,%cl 3b: 0f .byte 0xf 3c: 8c d4 mov %ss,%esp 3e: fe (bad) 3f: ff .byte 0xff