syzkaller
syzkaller login: [   12.458072][   T23] kauditd_printk_skb: 60 callbacks suppressed
[   12.458078][   T23] audit: type=1400 audit(1635221216.820:71): 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
[   12.464494][   T23] audit: type=1400 audit(1635221216.830:72): avc:  denied  { write } for  pid=290 comm="sh" path="pipe:[3771]" dev="pipefs" ino=3771 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1
[   12.635180][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #82!!!
[   12.638447][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #82!!!
[   13.132329][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!
[   13.135126][    T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!
Warning: Permanently added '10.128.1.34' (ECDSA) to the list of known hosts.
[   19.494329][   T23] audit: type=1400 audit(1635221223.860:73): avc:  denied  { execmem } for  pid=365 comm="syz-executor547" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   19.514643][   T23] audit: type=1400 audit(1635221223.890:74): avc:  denied  { mounton } for  pid=366 comm="syz-executor547" 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
executing program
[   19.538891][   T23] audit: type=1400 audit(1635221223.910:75): avc:  denied  { mount } for  pid=366 comm="syz-executor547" name="/" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1
[   19.561677][   T23] audit: type=1400 audit(1635221223.910:76): avc:  denied  { mounton } for  pid=366 comm="syz-executor547" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1
[   19.566328][  T366] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
[   19.583573][   T23] audit: type=1400 audit(1635221223.910:77): avc:  denied  { read write } for  pid=366 comm="syz-executor547" 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
[   19.593143][  T366] EXT4-fs error (device loop0): __ext4_new_inode:1072: comm syz-executor547: reserved inode found cleared - inode=1
[   19.616482][   T23] audit: type=1400 audit(1635221223.910:78): avc:  denied  { open } for  pid=366 comm="syz-executor547" 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
[   19.628744][  T366] incfs: Can't find or create .index dir in ./file0
[   19.652917][   T23] audit: type=1400 audit(1635221223.910:79): avc:  denied  { ioctl } for  pid=366 comm="syz-executor547" 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
[   19.684924][   T23] audit: type=1400 audit(1635221223.910:80): avc:  denied  { mounton } for  pid=366 comm="syz-executor547" path="/root/file0" dev="sda1" ino=1137 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1
[   19.685154][  T366] BUG: Dentry ffff8881199a4770{i=0,n=.index}  still in use (1) [unmount of ext4 loop0]
[   19.707669][   T23] audit: type=1400 audit(1635221223.960:81): avc:  denied  { mount } for  pid=366 comm="syz-executor547" name="/" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1
[   19.717258][  T366] ------------[ cut here ]------------
[   19.739044][   T23] audit: type=1400 audit(1635221223.960:82): avc:  denied  { mounton } for  pid=366 comm="syz-executor547" path="/root/file0" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1
[   19.744541][  T366] WARNING: CPU: 1 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0
[   19.744552][  T366] Modules linked in:
[   19.781288][  T366] CPU: 1 PID: 366 Comm: syz-executor547 Not tainted 5.10.75-syzkaller-01082-g234d53d2bb60 #0
[   19.791580][  T366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   19.801781][  T366] RIP: 0010:umount_check+0x18d/0x1d0
[   19.807134][  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
[   19.826977][  T366] RSP: 0018:ffffc9000028fab8 EFLAGS: 00010286
[   19.833090][  T366] RAX: 0000000000000054 RBX: ffffffff86690d40 RCX: ad9b5f8aa6b09900
[   19.841551][  T366] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
[   19.849627][  T366] RBP: ffffc9000028fae8 R08: ffffffff81545368 R09: 0000000000000003
[   19.857693][  T366] R10: fffff52000051ea9 R11: 0000000000000004 R12: ffff8881199a4770
[   19.865679][  T366] R13: dffffc0000000000 R14: ffff88811d4293f8 R15: 0000000000000001
[   19.873660][  T366] FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
[   19.882623][  T366] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.889208][  T366] CR2: 0000559638860bc0 CR3: 000000010c32b000 CR4: 00000000003506a0
[   19.897200][  T366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   19.905205][  T366] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   19.913192][  T366] Call Trace:
[   19.916680][  T366]  d_walk+0x309/0x540
[   19.920657][  T366]  ? __d_free+0x30/0x30
[   19.924854][  T366]  shrink_dcache_for_umount+0x8e/0x1b0
[   19.930304][  T366]  generic_shutdown_super+0x66/0x2c0
[   19.935648][  T366]  kill_block_super+0x80/0xe0
[   19.940311][  T366]  deactivate_locked_super+0xb0/0x100
[   19.945717][  T366]  deactivate_super+0xa5/0xd0
[   19.950478][  T366]  cleanup_mnt+0x45f/0x510
[   19.954927][  T366]  __cleanup_mnt+0x19/0x20
[   19.959328][  T366]  task_work_run+0x147/0x1b0
[   19.963932][  T366]  do_exit+0x70e/0x23a0
[   19.968084][  T366]  ? vmacache_update+0xb7/0x120
[   19.972942][  T366]  ? mm_update_next_owner+0x6e0/0x6e0
[   19.978295][  T366]  ? do_user_addr_fault+0x863/0xd70
[   19.983677][  T366]  do_group_exit+0x16a/0x2d0
[   19.988268][  T366]  __do_sys_exit_group+0x17/0x20
[   19.993238][  T366]  __se_sys_exit_group+0x14/0x20
[   19.998161][  T366]  __x64_sys_exit_group+0x3b/0x40
[   20.003302][  T366]  do_syscall_64+0x31/0x70
[   20.007726][  T366]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   20.013911][  T366] RIP: 0033:0x7fa0992ea0a9
[   20.018493][  T366] Code: Unable to access opcode bytes at RIP 0x7fa0992ea07f.
[   20.025866][  T366] RSP: 002b:00007fff8b922a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   20.034280][  T366] RAX: ffffffffffffffda RBX: 00007fa09935e330 RCX: 00007fa0992ea0a9
[   20.042265][  T366] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
[   20.050312][  T366] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007fa099358e40
[   20.058294][  T366] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa09935e330
[   20.066267][  T366] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
[   20.074261][  T366] ---[ end trace 1aa5d271f17b63c0 ]---
[   20.081146][  T366] VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds.  Have a nice day...