syzkaller syzkaller login: [ 12.670824][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 12.850918][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 13.279015][ T23] kauditd_printk_skb: 60 callbacks suppressed [ 13.279022][ T23] audit: type=1400 audit(1635226326.620:71): 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 [ 13.285694][ T23] audit: type=1400 audit(1635226326.630:72): avc: denied { write } for pid=290 comm="sh" path="pipe:[1436]" dev="pipefs" ino=1436 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1 [ 13.290947][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!! [ 13.472156][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #8a!!! Warning: Permanently added '10.128.0.114' (ECDSA) to the list of known hosts. executing program [ 20.444736][ T23] audit: type=1400 audit(1635226333.790:73): avc: denied { execmem } for pid=365 comm="syz-executor154" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 20.464495][ T23] audit: type=1400 audit(1635226333.810:74): avc: denied { mounton } for pid=366 comm="syz-executor154" 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 [ 20.485527][ T366] incfs: Can't find or create .index dir in ./file0 [ 20.488720][ T23] audit: type=1400 audit(1635226333.820:75): avc: denied { mount } for pid=366 comm="syz-executor154" name="/" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1 [ 20.517366][ T23] audit: type=1400 audit(1635226333.820:76): avc: denied { mounton } for pid=366 comm="syz-executor154" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1 [ 20.517504][ T366] BUG: Dentry ffff88811a19d000{i=0,n=.index} still in use (1) [unmount of sysfs sysfs] [ 20.539108][ T23] audit: type=1400 audit(1635226333.830:77): avc: denied { mounton } for pid=366 comm="syz-executor154" path="/root/file0" dev="sda1" ino=1137 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 20.548683][ T366] ------------[ cut here ]------------ [ 20.571594][ T23] audit: type=1400 audit(1635226333.830:78): avc: denied { mount } for pid=366 comm="syz-executor154" name="/" dev="sysfs" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:sysfs_t tclass=filesystem permissive=1 [ 20.576889][ T366] WARNING: CPU: 0 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0 [ 20.599179][ T23] audit: type=1400 audit(1635226333.830:79): avc: denied { mounton } for pid=366 comm="syz-executor154" path="/root/file0" dev="sysfs" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:sysfs_t tclass=dir permissive=1 [ 20.607496][ T366] Modules linked in: [ 20.634215][ T366] CPU: 0 PID: 366 Comm: syz-executor154 Not tainted 5.10.75-syzkaller-01082-g234d53d2bb60 #0 [ 20.644355][ T366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.654439][ T366] RIP: 0010:umount_check+0x18d/0x1d0 [ 20.659702][ 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 [ 20.679342][ T366] RSP: 0018:ffffc90000c07a70 EFLAGS: 00010292 [ 20.685449][ T366] RAX: 0000000000000055 RBX: ffffffff86672100 RCX: b47d5ab550672900 [ 20.693455][ T366] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 [ 20.701442][ T366] RBP: ffffc90000c07aa0 R08: ffffffff81545368 R09: 0000000000000003 [ 20.709419][ T366] R10: fffff52000180ea1 R11: 0000000000000004 R12: ffff88811a19d000 [ 20.717398][ T366] R13: dffffc0000000000 R14: ffff8881069b13f8 R15: 0000000000000001 [ 20.725384][ T366] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 20.734352][ T366] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.740960][ T366] CR2: 00007f76596621d0 CR3: 000000010bb9d000 CR4: 00000000003506b0 [ 20.748922][ T366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.756922][ T366] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.764908][ T366] Call Trace: [ 20.768180][ T366] d_walk+0x309/0x540 [ 20.772163][ T366] ? __d_free+0x30/0x30 [ 20.776304][ T366] shrink_dcache_for_umount+0x8e/0x1b0 [ 20.781765][ T366] generic_shutdown_super+0x66/0x2c0 [ 20.787037][ T366] kill_anon_super+0x3c/0x70 [ 20.791640][ T366] kernfs_kill_sb+0x14d/0x170 [ 20.796311][ T366] sysfs_kill_sb+0x22/0x40 [ 20.800700][ T366] deactivate_locked_super+0xb0/0x100 [ 20.806084][ T366] deactivate_super+0xa5/0xd0 [ 20.810768][ T366] cleanup_mnt+0x45f/0x510 [ 20.815170][ T366] __cleanup_mnt+0x19/0x20 [ 20.819584][ T366] task_work_run+0x147/0x1b0 [ 20.824183][ T366] do_exit+0x70e/0x23a0 [ 20.828323][ T366] ? vmacache_update+0xb7/0x120 [ 20.833181][ T366] ? mm_update_next_owner+0x6e0/0x6e0 [ 20.838543][ T366] ? do_user_addr_fault+0x863/0xd70 [ 20.843762][ T366] do_group_exit+0x16a/0x2d0 [ 20.848333][ T366] __do_sys_exit_group+0x17/0x20 [ 20.853309][ T366] __se_sys_exit_group+0x14/0x20 [ 20.858244][ T366] __x64_sys_exit_group+0x3b/0x40 [ 20.863782][ T366] do_syscall_64+0x31/0x70 [ 20.868190][ T366] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 20.874213][ T366] RIP: 0033:0x7f76595ed529 [ 20.878779][ T366] Code: Unable to access opcode bytes at RIP 0x7f76595ed4ff. [ 20.886155][ T366] RSP: 002b:00007ffff6d381e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 20.894588][ T366] RAX: ffffffffffffffda RBX: 00007f7659661330 RCX: 00007f76595ed529 [ 20.902579][ T366] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 20.910542][ T366] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f765965be40 [ 20.918706][ T366] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7659661330 [ 20.926686][ T366] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 20.934672][ T366] ---[ end trace 74677774e38cd9f3 ]--- [ 20.940209][ T366] VFS: Busy inodes after unmount of sysfs. Self-destruct in