BUG: Dentry ffff8881e5cb5550{i=0,n=.index} still in use (1) [unmount of sysfs sysfs] ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1168 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Modules linked in: CPU: 1 PID: 1168 Comm: syz-executor.5 Not tainted 5.4.119-syzkaller-00548-g06fadb540e1e #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 e0 02 e9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 07 ac 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:ffff8881ea7f7c18 EFLAGS: 00010286 RAX: 0000000000000055 RBX: ffffffff85f93e00 RCX: dff695c020970100 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8881e620d420 R08: ffffffff814e8787 R09: ffffed103ede5e08 R10: ffffed103ede5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881e5cb5550 FS: 0000000002d87400(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fde97590718 CR3: 00000001e546b000 CR4: 00000000001426e0 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_anon_super+0x36/0x60 fs/super.c:1108 kernfs_kill_sb+0x127/0x140 fs/kernfs/mount.c:360 sysfs_kill_sb+0x1e/0x30 fs/sysfs/mount.c:86 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: 0033:0x467a37 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:00007fff7930fb38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a37 RDX: 00007fff7930fc0b RSI: 0000000000000002 RDI: 00007fff7930fc00 RBP: 00007fff7930fc00 R08: 00000000ffffffff R09: 00007fff7930f9d0 R10: 0000000002d88bd3 R11: 0000000000000202 R12: 00000000004bee70 R13: 00007fff79310cd0 R14: 0000000002d88b00 R15: 00007fff79310d10 ---[ end trace fb4cda8319493616 ]--- BUG: Dentry ffff8881e5cb5550{i=0,n=.index} still in use (1) [unmount of sysfs sysfs] ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1168 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Modules linked in: CPU: 0 PID: 1168 Comm: syz-executor.5 Tainted: G W 5.4.119-syzkaller-00548-g06fadb540e1e #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 e0 02 e9 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 07 ac 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:ffff8881ea7f7c18 EFLAGS: 00010286 RAX: 0000000000000055 RBX: ffffffff85f93e00 RCX: dff695c020970100 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffff8881e620d420 R08: ffffffff814e8787 R09: ffffed103edc5e08 R10: ffffed103edc5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881e5cb5550 FS: 0000000002d87400(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558cabc39190 CR3: 00000001e546b000 CR4: 00000000001426f0 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_anon_super+0x36/0x60 fs/super.c:1108 kernfs_kill_sb+0x127/0x140 fs/kernfs/mount.c:360 sysfs_kill_sb+0x1e/0x30 fs/sysfs/mount.c:86 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: 0033:0x467a37 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:00007fff7930fb38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a37 RDX: 00007fff7930fc0b RSI: 0000000000000002 RDI: 00007fff7930fc00 RBP: 00007fff7930fc00 R08: 00000000ffffffff R09: 00007fff7930f9d0 R10: 0000000002d88bd3 R11: 0000000000000202 R12: 00000000004bee70 R13: 00007fff79310cd0 R14: 0000000002d88b00 R15: 00007fff79310d10 ---[ end trace fb4cda8319493617 ]--- VFS: Busy inodes after unmount of sysfs. Self-destruct in 5 seconds. Have a nice day...