syzkaller
syzkaller login: [    8.101398][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!
[   12.032727][   T23] kauditd_printk_skb: 60 callbacks suppressed
[   12.032733][   T23] audit: type=1400 audit(1635222265.530:71): 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
[   12.038288][   T23] audit: type=1400 audit(1635222265.530:72): avc:  denied  { write } for  pid=290 comm="sh" path="pipe:[11407]" dev="pipefs" ino=11407 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1
[   12.651207][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #88!!!
[   12.652913][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #88!!!
Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts.
executing program
[   18.930050][   T23] audit: type=1400 audit(1635222272.420:73): avc:  denied  { execmem } for  pid=365 comm="syz-executor695" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   18.933422][   T23] audit: type=1400 audit(1635222272.430:74): avc:  denied  { mounton } for  pid=366 comm="syz-executor695" 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
[   18.936925][   T23] audit: type=1400 audit(1635222272.430:75): avc:  denied  { mount } for  pid=366 comm="syz-executor695" name="/" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1
[   18.940278][   T23] audit: type=1400 audit(1635222272.430:76): avc:  denied  { mounton } for  pid=366 comm="syz-executor695" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1
[   18.946117][   T23] audit: type=1400 audit(1635222272.440:77): avc:  denied  { read write } for  pid=366 comm="syz-executor695" 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
[   18.949647][   T23] audit: type=1400 audit(1635222272.440:78): avc:  denied  { open } for  pid=366 comm="syz-executor695" 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
[   18.960352][  T366] ======================================================
[   18.960352][  T366] WARNING: the mand mount option is being deprecated and
[   18.960352][  T366]          will be removed in v5.15!
[   18.960352][  T366] ======================================================
[   18.974833][   T23] audit: type=1400 audit(1635222272.440:79): avc:  denied  { ioctl } for  pid=366 comm="syz-executor695" 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
[   18.997818][  T366] incfs: Can't find or create .index dir in ./file0
[   19.023456][   T23] audit: type=1400 audit(1635222272.450:80): avc:  denied  { mounton } for  pid=366 comm="syz-executor695" path="/root/file0" dev="sda1" ino=1137 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1
[   19.052243][   T23] audit: type=1400 audit(1635222272.450:81): avc:  denied  { mount } for  pid=366 comm="syz-executor695" name="/" dev="loop0" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:dosfs_t tclass=filesystem permissive=1
[   19.052446][  T366] BUG: Dentry ffff888119d84220{i=0,n=.index}  still in use (1) [unmount of vfat loop0]
[   19.074875][   T23] audit: type=1400 audit(1635222272.450:82): avc:  denied  { mounton } for  pid=366 comm="syz-executor695" path="/root/file0/file0" dev="loop0" ino=4 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:dosfs_t tclass=dir permissive=1
[   19.084069][  T366] ------------[ cut here ]------------
[   19.112577][  T366] WARNING: CPU: 0 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0
[   19.120877][  T366] Modules linked in:
[   19.124832][  T366] CPU: 0 PID: 366 Comm: syz-executor695 Not tainted 5.10.75-syzkaller-01082-g234d53d2bb60 #0
[   19.134983][  T366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   19.145050][  T366] RIP: 0010:umount_check+0x18d/0x1d0
[   19.150322][  T366] Code: 8b 0b 49 81 c6 f8 03 00 00 48 c7 c7 40 43 2e 85 4c 89 e6 48 8b 55 d0 4c 89 e1 45 89 f8 31 c0 41 56 e8 ae 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
[   19.169943][  T366] RSP: 0018:ffffc9000026fab8 EFLAGS: 00010286
[   19.176168][  T366] RAX: 0000000000000054 RBX: ffffffff866b3380 RCX: e181cf95107d0f00
[   19.184164][  T366] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
[   19.192161][  T366] RBP: ffffc9000026fae8 R08: ffffffff81545368 R09: 0000000000000003
[   19.200115][  T366] R10: fffff5200004dea9 R11: 0000000000000004 R12: ffff888119d84220
[   19.208088][  T366] R13: dffffc0000000000 R14: ffff88811d83d3f8 R15: 0000000000000001
[   19.216066][  T366] FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
[   19.225000][  T366] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.231591][  T366] CR2: 0000565259328000 CR3: 000000011d75f000 CR4: 00000000003506b0
[   19.239637][  T366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   19.247608][  T366] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   19.255589][  T366] Call Trace:
[   19.258860][  T366]  d_walk+0x309/0x540
[   19.262836][  T366]  ? __d_free+0x30/0x30
[   19.266976][  T366]  shrink_dcache_for_umount+0x8e/0x1b0
[   19.272434][  T366]  generic_shutdown_super+0x66/0x2c0
[   19.277708][  T366]  kill_block_super+0x80/0xe0
[   19.282390][  T366]  deactivate_locked_super+0xb0/0x100
[   19.287739][  T366]  deactivate_super+0xa5/0xd0
[   19.292421][  T366]  cleanup_mnt+0x45f/0x510
[   19.296825][  T366]  __cleanup_mnt+0x19/0x20
[   19.301241][  T366]  task_work_run+0x147/0x1b0
[   19.305822][  T366]  do_exit+0x70e/0x23a0
[   19.309949][  T366]  ? vmacache_update+0xb7/0x120
[   19.314804][  T366]  ? mm_update_next_owner+0x6e0/0x6e0
[   19.320155][  T366]  ? do_user_addr_fault+0x863/0xd70
[   19.325361][  T366]  do_group_exit+0x16a/0x2d0
[   19.329931][  T366]  __do_sys_exit_group+0x17/0x20
[   19.334867][  T366]  __se_sys_exit_group+0x14/0x20
[   19.339797][  T366]  __x64_sys_exit_group+0x3b/0x40
[   19.344841][  T366]  do_syscall_64+0x31/0x70
[   19.349272][  T366]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   19.355198][  T366] RIP: 0033:0x7fd144359829
[   19.359602][  T366] Code: Unable to access opcode bytes at RIP 0x7fd1443597ff.
[   19.366985][  T366] RSP: 002b:00007ffd57113618 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   19.375513][  T366] RAX: ffffffffffffffda RBX: 00007fd1443cd330 RCX: 00007fd144359829
[   19.383529][  T366] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
[   19.391513][  T366] RBP: 0000000000000001 R08: ffffffffffffffc4 R09: 0000000000000000
[   19.399579][  T366] R10: 0000000002000040 R11: 0000000000000246 R12: 00007fd1443cd330
[   19.407604][  T366] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
[   19.415609][  T366] ---[ end trace e1efaedf9d309be8 ]---
[   19.421788][  T366] VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds.  Have a nice day...