syzkaller login: [    7.537370][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!
[   12.417221][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #10!!!
[   12.429441][   T23] kauditd_printk_skb: 60 callbacks suppressed
[   12.429447][   T23] audit: type=1400 audit(1635563686.869:71): avc:  denied  { transition } for  pid=290 comm="sshd" path="/bin/sh" dev="sda1" ino=73 scontext=system_u:system_r:initrc_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   12.434877][   T23] audit: type=1400 audit(1635563686.869:72): avc:  denied  { write } for  pid=290 comm="sh" path="pipe:[10530]" dev="pipefs" ino=10530 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1
[   12.599892][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
[   12.602735][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
[   12.604872][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
[   13.067238][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #88!!!
Warning: Permanently added '10.128.1.124' (ECDSA) to the list of known hosts.
executing program
[   23.458853][   T23] audit: type=1400 audit(1635563697.899:73): avc:  denied  { execmem } for  pid=365 comm="syz-executor166" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   23.462241][   T23] audit: type=1400 audit(1635563697.899:74): avc:  denied  { mounton } for  pid=366 comm="syz-executor166" path="/sys/fs/fuse/connections" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=dir permissive=1
[   23.465896][   T23] audit: type=1400 audit(1635563697.899:75): avc:  denied  { mount } for  pid=366 comm="syz-executor166" name="/" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1
[   23.469617][   T23] audit: type=1400 audit(1635563697.899:76): avc:  denied  { mounton } for  pid=366 comm="syz-executor166" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1
[   23.473196][   T23] audit: type=1400 audit(1635563697.909:77): avc:  denied  { mounton } for  pid=366 comm="syz-executor166" path="/dev/binderfs" dev="devtmpfs" ino=363 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:device_t tclass=dir permissive=1
[   23.476581][   T23] audit: type=1400 audit(1635563697.909:78): avc:  denied  { mount } for  pid=366 comm="syz-executor166" name="/" dev="binder" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=filesystem permissive=1
[   23.480441][   T23] audit: type=1400 audit(1635563697.909:79): avc:  denied  { read write } for  pid=366 comm="syz-executor166" name="loop0" dev="devtmpfs" ino=115 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1
[   23.485159][  T366] EXT4-fs (loop0): mounted filesystem without journal. Opts: noblock_validity,,errors=continue
[   23.504754][   T23] audit: type=1400 audit(1635563697.909:80): avc:  denied  { open } for  pid=366 comm="syz-executor166" path="/dev/loop0" dev="devtmpfs" ino=115 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1
[   23.527943][  T366] incfs: Can't find or create .index dir in ./file0
[   23.539298][   T23] audit: type=1400 audit(1635563697.909:81): avc:  denied  { ioctl } for  pid=366 comm="syz-executor166" path="/dev/loop0" dev="devtmpfs" ino=115 ioctlcmd=0x4c00 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1
[   23.571275][   T23] audit: type=1400 audit(1635563697.909:82): avc:  denied  { mounton } for  pid=366 comm="syz-executor166" path="/root/file0" dev="sda1" ino=1138 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1
[   23.571656][  T366] BUG: Dentry ffff88811a0a4220{i=0,n=.index}  still in use (1) [unmount of ext4 loop0]
[   23.603839][  T366] ------------[ cut here ]------------
[   23.609372][  T366] WARNING: CPU: 0 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0
[   23.617742][  T366] Modules linked in:
[   23.621618][  T366] CPU: 0 PID: 366 Comm: syz-executor166 Not tainted 5.10.76-syzkaller-01178-g4944ec82ebb9 #0
[   23.632166][  T366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   23.642274][  T366] RIP: 0010:umount_check+0x18d/0x1d0
[   23.647628][  T366] Code: 8b 0b 49 81 c6 f8 03 00 00 48 c7 c7 40 44 2e 85 4c 89 e6 48 8b 55 d0 4c 89 e1 45 89 f8 31 c0 41 56 e8 5e d9 9e ff 48 83 c4 08 <0f> 0b e9 f1 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c c9 fe ff
[   23.667287][  T366] RSP: 0018:ffffc9000029fab8 EFLAGS: 00010286
[   23.673328][  T366] RAX: 0000000000000054 RBX: ffffffff86690d40 RCX: 0891bab4d1cc5900
[   23.681353][  T366] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
[   23.689431][  T366] RBP: ffffc9000029fae8 R08: ffffffff81545288 R09: ffffed103ee095d8
[   23.697419][  T366] R10: ffffed103ee095d8 R11: 0000000000000000 R12: ffff88811a0a4220
[   23.705385][  T366] R13: dffffc0000000000 R14: ffff8881061ee3f8 R15: 0000000000000001
[   23.713411][  T366] FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
[   23.722395][  T366] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   23.729152][  T366] CR2: 00007f4e5ba421d0 CR3: 000000010c2ff000 CR4: 00000000003506b0
[   23.737105][  T366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   23.745077][  T366] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   23.753052][  T366] Call Trace:
[   23.756326][  T366]  d_walk+0x309/0x540
[   23.760305][  T366]  ? __d_free+0x30/0x30
[   23.764441][  T366]  shrink_dcache_for_umount+0x8e/0x1b0
[   23.769910][  T366]  generic_shutdown_super+0x66/0x2c0
[   23.775184][  T366]  kill_block_super+0x80/0xe0
[   23.779858][  T366]  deactivate_locked_super+0xb0/0x100
[   23.785216][  T366]  deactivate_super+0xa5/0xd0
[   23.789889][  T366]  cleanup_mnt+0x45f/0x510
[   23.794327][  T366]  __cleanup_mnt+0x19/0x20
[   23.798746][  T366]  task_work_run+0x147/0x1b0
[   23.803326][  T366]  do_exit+0x70e/0x23a0
[   23.807483][  T366]  ? vmacache_update+0xb7/0x120
[   23.812324][  T366]  ? mm_update_next_owner+0x6e0/0x6e0
[   23.817692][  T366]  ? do_user_addr_fault+0x863/0xd70
[   23.822875][  T366]  do_group_exit+0x16a/0x2d0
[   23.827492][  T366]  __do_sys_exit_group+0x17/0x20
[   23.832430][  T366]  __se_sys_exit_group+0x14/0x20
[   23.837369][  T366]  __x64_sys_exit_group+0x3b/0x40
[   23.842381][  T366]  do_syscall_64+0x31/0x70
[   23.846767][  T366]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   23.852654][  T366] RIP: 0033:0x7f4e5b9cd059
[   23.857045][  T366] Code: Unable to access opcode bytes at RIP 0x7f4e5b9cd02f.
[   23.864413][  T366] RSP: 002b:00007ffd764d8988 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   23.872845][  T366] RAX: ffffffffffffffda RBX: 00007f4e5ba41330 RCX: 00007f4e5b9cd059
[   23.880826][  T366] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
[   23.888985][  T366] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f4e5ba3be40
[   23.896937][  T366] R10: 0000000000804c10 R11: 0000000000000246 R12: 00007f4e5ba41330
[   23.904908][  T366] R13: 0000000000000001 R14: 0000000000000000 R15