syzkaller syzkaller login: [ 10.827480][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #82!!! [ 10.875850][ T23] kauditd_printk_skb: 60 callbacks suppressed [ 10.875859][ T23] audit: type=1400 audit(1635383504.359:71): 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 [ 10.881227][ T23] audit: type=1400 audit(1635383504.369:72): avc: denied { write } for pid=290 comm="sh" path="pipe:[1431]" dev="pipefs" ino=1431 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1 [ 11.057951][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 11.060244][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 12.057294][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. executing program [ 20.292847][ T23] audit: type=1400 audit(1635383513.779:73): avc: denied { execmem } for pid=365 comm="syz-executor878" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 20.296038][ T23] audit: type=1400 audit(1635383513.779:74): avc: denied { mounton } for pid=366 comm="syz-executor878" 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 [ 20.299975][ T23] audit: type=1400 audit(1635383513.779:75): avc: denied { mount } for pid=366 comm="syz-executor878" name="/" dev="fusectl" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1 [ 20.303621][ T23] audit: type=1400 audit(1635383513.779:76): avc: denied { mounton } for pid=366 comm="syz-executor878" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1 [ 20.307401][ T23] audit: type=1400 audit(1635383513.789:77): avc: denied { read write } for pid=366 comm="syz-executor878" 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 [ 20.311157][ T23] audit: type=1400 audit(1635383513.799:78): avc: denied { open } for pid=366 comm="syz-executor878" 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 [ 20.318040][ T367] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue [ 20.325379][ T23] audit: type=1400 audit(1635383513.799:79): avc: denied { ioctl } for pid=366 comm="syz-executor878" 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 [ 20.348144][ T367] EXT4-fs error (device loop0): __ext4_new_inode:1072: comm syz-executor878: reserved inode found cleared - inode=1 [ 20.359975][ T23] audit: type=1400 audit(1635383513.799:80): avc: denied { mounton } for pid=366 comm="syz-executor878" path="/root/file0" dev="sda1" ino=1137 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 20.372100][ T367] incfs: Can't find or create .index dir in ./file0 [ 20.394847][ T23] audit: type=1400 audit(1635383513.819:81): avc: denied { mount } for pid=366 comm="syz-executor878" name="/" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1 [ 20.422810][ T23] audit: type=1400 audit(1635383513.839:82): avc: denied { mounton } for pid=366 comm="syz-executor878" path="/root/file0" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 20.423013][ T371] BUG: Dentry ffff88811a573bb0{i=0,n=.index} still in use (1) [unmount of ext4 loop0] [ 20.456171][ T371] ------------[ cut here ]------------ [ 20.461702][ T371] WARNING: CPU: 0 PID: 371 at fs/dcache.c:1616 umount_check+0x18d/0x1d0 [ 20.470066][ T371] Modules linked in: [ 20.473957][ T371] CPU: 0 PID: 371 Comm: syz-executor878 Not tainted 5.10.76-syzkaller-01178-g4944ec82ebb9 #0 [ 20.484194][ T371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.494301][ T371] RIP: 0010:umount_check+0x18d/0x1d0 [ 20.499641][ T371] 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 [ 20.519308][ T371] RSP: 0018:ffffc9000098f778 EFLAGS: 00010286 [ 20.525352][ T371] RAX: 0000000000000054 RBX: ffffffff86690d40 RCX: 40909e59cee71500 [ 20.533328][ T371] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 [ 20.541305][ T371] RBP: ffffc9000098f7a8 R08: ffffffff81545288 R09: ffffed103ee095d8 [ 20.549629][ T371] R10: ffffed103ee095d8 R11: 0000000000000000 R12: ffff88811a573bb0 [ 20.557603][ T371] R13: dffffc0000000000 R14: ffff888105fa93f8 R15: 0000000000000001 [ 20.565556][ T371] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 20.574484][ T371] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.581072][ T371] CR2: 00007fb80864f278 CR3: 000000010b96f000 CR4: 00000000003506b0 [ 20.589046][ T371] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.596997][ T371] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.604969][ T371] Call Trace: [ 20.608278][ T371] d_walk+0x309/0x540 [ 20.612234][ T371] ? __d_free+0x30/0x30 [ 20.616370][ T371] shrink_dcache_for_umount+0x8e/0x1b0 [ 20.621826][ T371] generic_shutdown_super+0x66/0x2c0 [ 20.627087][ T371] kill_block_super+0x80/0xe0 [ 20.631765][ T371] deactivate_locked_super+0xb0/0x100 [ 20.637115][ T371] deactivate_super+0xa5/0xd0 [ 20.641790][ T371] cleanup_mnt+0x45f/0x510 [ 20.646193][ T371] __cleanup_mnt+0x19/0x20 [ 20.650609][ T371] task_work_run+0x147/0x1b0 [ 20.655186][ T371] do_exit+0x70e/0x23a0 [ 20.659356][ T371] ? __fput+0x603/0x7d0 [ 20.663508][ T371] ? ____fput+0x15/0x20 [ 20.667665][ T371] ? syscall_exit_to_user_mode+0x24/0x40 [ 20.673304][ T371] ? do_syscall_64+0x3d/0x70 [ 20.677978][ T371] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 20.684055][ T371] ? mm_update_next_owner+0x6e0/0x6e0 [ 20.689453][ T371] ? __kasan_check_write+0x14/0x20 [ 20.694558][ T371] ? _raw_spin_lock_irq+0xa4/0x1b0 [ 20.699693][ T371] do_group_exit+0x16a/0x2d0 [ 20.704283][ T371] get_signal+0x133e/0x1f80 [ 20.708815][ T371] ? ptrace_notify+0x340/0x340 [ 20.713572][ T371] ? __kasan_slab_free+0x11/0x20 [ 20.718535][ T371] ? slab_free_freelist_hook+0xcc/0x1a0 [ 20.724167][ T371] arch_do_signal+0x8d/0x620 [ 20.728767][ T371] ? __do_sys_rt_sigreturn+0x1e0/0x1e0 [ 20.734223][ T371] ? debug_smp_processor_id+0x1c/0x20 [ 20.739601][ T371] exit_to_user_mode_prepare+0xaa/0xe0 [ 20.745046][ T371] syscall_exit_to_user_mode+0x24/0x40 [ 20.750505][ T371] do_syscall_64+0x3d/0x70 [ 20.754910][ T371] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 20.760824][ T371] RIP: 0033:0x7fb8085fe259 [ 20.765232][ T371] Code: Unable to access opcode bytes at RIP 0x7fb8085fe22f. [ 20.772602][ T371] RSP: 002b:00007fb80858a2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 20.781027][ T371] RAX: fffffffffffffe00 RBX: 00007fb8086833f0 RCX: 00007fb8085fe259 [ 20.789011][ T371] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb8086833f8 [ 20.796964][ T371] RBP: 00007fb8086833fc R08: 0000000000000000 R09: 0000000000000000 [ 20.804944][ T371] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 20.813087][ T371] R13: 6e656d6572636e69 R14: e5d26e84aa4cf3c6 R15: 00007fb8086833f8 [ 20.821088][ T371] ---[ end trace 04acae3d1bf2dbb2 ]--- [ 20.828209][ T371] VFS: Busy inodes after unmount of loop0. Self-destruct in 5 seconds. Have a nice day...