syzkaller syzkaller login: [ 11.448219][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 11.521295][ T23] kauditd_printk_skb: 60 callbacks suppressed [ 11.521302][ T23] audit: type=1400 audit(1635416528.959:71): 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 [ 11.527037][ T23] audit: type=1400 audit(1635416528.959:72): avc: denied { write } for pid=290 comm="sh" path="pipe:[1996]" dev="pipefs" ino=1996 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1 [ 11.728800][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 11.731034][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 12.048624][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 12.050433][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! Warning: Permanently added '10.128.1.51' (ECDSA) to the list of known hosts. executing program [ 18.385565][ T23] audit: type=1400 audit(1635416535.819:73): avc: denied { execmem } for pid=365 comm="syz-executor811" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 18.389190][ T23] audit: type=1400 audit(1635416535.829:74): avc: denied { mounton } for pid=366 comm="syz-executor811" 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 [ 18.392786][ T23] audit: type=1400 audit(1635416535.829:75): avc: denied { mount } for pid=366 comm="syz-executor811" name="/" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1 [ 18.396145][ T23] audit: type=1400 audit(1635416535.829:76): avc: denied { mounton } for pid=366 comm="syz-executor811" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1 [ 18.402114][ T23] audit: type=1400 audit(1635416535.839:77): avc: denied { read write } for pid=366 comm="syz-executor811" 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 [ 18.405697][ T366] exFAT-fs (loop0): failed to load upcase table (idx : 0x00000c00, chksum : 0x00000000, utbl_chksum : 0xe619d30d) [ 18.407665][ T23] audit: type=1400 audit(1635416535.839:78): avc: denied { open } for pid=366 comm="syz-executor811" 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 [ 18.420036][ T366] exFAT-fs (loop0): error, exfat_alloc_cluster: invalid used clusters(t:15,u:4294967295) [ 18.420036][ T366] [ 18.455615][ T366] exFAT-fs (loop0): Filesystem has been set read-only [ 18.462412][ T366] incfs: Can't find or create .index dir in ./file0 [ 18.469645][ T23] audit: type=1400 audit(1635416535.839:79): avc: denied { ioctl } for pid=366 comm="syz-executor811" 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 [ 18.495497][ T366] BUG: Dentry ffff88811a47a660{i=0,n=.index} still in use (1) [unmount of exfat loop0] [ 18.495526][ T23] audit: type=1400 audit(1635416535.839:80): avc: denied { mounton } for pid=366 comm="syz-executor811" path="/root/file0" dev="sda1" ino=1137 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 18.505316][ T366] ------------[ cut here ]------------ [ 18.528504][ T23] audit: type=1400 audit(1635416535.859:81): avc: denied { mount } for pid=366 comm="syz-executor811" name="/" dev="loop0" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=filesystem permissive=1 [ 18.533413][ T366] WARNING: CPU: 0 PID: 366 at fs/dcache.c:1616 umount_check+0x18d/0x1d0 [ 18.556115][ T23] audit: type=1400 audit(1635416535.859:82): avc: denied { write } for pid=366 comm="syz-executor811" name="/" dev="loop0" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 18.564199][ T366] Modules linked in: [ 18.564217][ T366] CPU: 0 PID: 366 Comm: syz-executor811 Not tainted 5.10.76-syzkaller-01178-g4944ec82ebb9 #0 [ 18.564231][ T366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.611151][ T366] RIP: 0010:umount_check+0x18d/0x1d0 [ 18.616524][ T366] Code: 8b 0b 49 81 c6 f8 03 00 00 48 c7 c7 00 40 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 [ 18.636167][ T366] RSP: 0018:ffffc90000bb7ab8 EFLAGS: 00010286 [ 18.642239][ T366] RAX: 0000000000000055 RBX: ffffffff866b4400 RCX: a00c70a513dce700 [ 18.650208][ T366] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 [ 18.658181][ T366] RBP: ffffc90000bb7ae8 R08: ffffffff81545288 R09: 0000000000000003 [ 18.666124][ T366] R10: fffff52000176ea9 R11: 0000000000000004 R12: ffff88811a47a660 [ 18.674097][ T366] R13: dffffc0000000000 R14: ffff8881069b83f8 R15: 0000000000000001 [ 18.682064][ T366] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 18.690988][ T366] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.697570][ T366] CR2: 00007f5db3f691d0 CR3: 000000000640f000 CR4: 00000000003506b0 [ 18.705546][ T366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.713512][ T366] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.721484][ T366] Call Trace: [ 18.724757][ T366] d_walk+0x309/0x540 [ 18.728744][ T366] ? __d_free+0x30/0x30 [ 18.732900][ T366] shrink_dcache_for_umount+0x8e/0x1b0 [ 18.738357][ T366] generic_shutdown_super+0x66/0x2c0 [ 18.743624][ T366] kill_block_super+0x80/0xe0 [ 18.748310][ T366] deactivate_locked_super+0xb0/0x100 [ 18.753666][ T366] deactivate_super+0xa5/0xd0 [ 18.758340][ T366] cleanup_mnt+0x45f/0x510 [ 18.762835][ T366] __cleanup_mnt+0x19/0x20 [ 18.767233][ T366] task_work_run+0x147/0x1b0 [ 18.771833][ T366] do_exit+0x70e/0x23a0 [ 18.775990][ T366] ? vmacache_update+0xb7/0x120 [ 18.780863][ T366] ? mm_update_next_owner+0x6e0/0x6e0 [ 18.786224][ T366] ? do_user_addr_fault+0x863/0xd70 [ 18.791440][ T366] do_group_exit+0x16a/0x2d0 [ 18.796015][ T366] __do_sys_exit_group+0x17/0x20 [ 18.800949][ T366] __se_sys_exit_group+0x14/0x20 [ 18.805873][ T366] __x64_sys_exit_group+0x3b/0x40 [ 18.810911][ T366] do_syscall_64+0x31/0x70 [ 18.815335][ T366] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 18.821228][ T366] RIP: 0033:0x7f5db3ef4249 [ 18.825620][ T366] Code: Unable to access opcode bytes at RIP 0x7f5db3ef421f. [ 18.832986][ T366] RSP: 002b:00007fff23a8ba98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 18.841427][ T366] RAX: ffffffffffffffda RBX: 00007f5db3f68330 RCX: 00007f5db3ef4249 [ 18.849416][ T366] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 18.857376][ T366] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f5db3f62e40 [ 18.865450][ T366] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5db3f68330 [ 18.873427][ T366] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 18.881407][ T366] ---[ end trace 614232d097d0a2fd ]--- [ 18.886981][ T366] VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds. Have a nice day...