[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [ 109.754984][ T27] audit: type=1400 audit(1580042199.942:37): avc: denied { watch } for pid=10554 comm="restorecond" path="/root/.ssh" dev="sda1" ino=16179 scontext=system_u:system_r:kernel_t:s0 tcontext=unconfined_u:object_r:ssh_home_t:s0 tclass=dir permissive=1 [ 109.796563][ T27] audit: type=1400 audit(1580042199.942:38): avc: denied { watch } for pid=10554 comm="restorecond" path="/etc/selinux/restorecond.conf" dev="sda1" ino=2232 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.182' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 1120.635030][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 1120.635047][ T27] audit: type=1400 audit(1580043210.822:42): avc: denied { map } for pid=10657 comm="syz-executor996" path="/root/syz-executor996363102" dev="sda1" ino=16461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 1120.679103][ T27] audit: type=1400 audit(1580043210.832:43): avc: denied { open } for pid=10665 comm="syz-executor996" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=perf_event permissive=1 [ 1120.702846][ T27] audit: type=1400 audit(1580043210.832:44): avc: denied { kernel } for pid=10665 comm="syz-executor996" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=perf_event permissive=1 [ 1120.737508][ C1] hrtimer: interrupt took 32883 ns [ 1225.746403][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1225.753473][ C1] (detected by 1, t=10502 jiffies, g=11349, q=5) [ 1225.759898][ C1] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295059717-4295049214), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 1225.773265][ C1] syz-executor996 R running task 24984 10669 10660 0x00004000 [ 1225.781785][ C1] Call Trace: [ 1225.785086][ C1] [ 1225.788105][ C1] sched_show_task.cold+0x2ee/0x35d [ 1225.793437][ C1] ? can_nice.part.0+0x20/0x20 [ 1225.798301][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 1225.804230][ C1] rcu_sched_clock_irq.cold+0xaf4/0xc0d [ 1225.809979][ C1] update_process_times+0x2d/0x70 [ 1225.815074][ C1] tick_sched_handle+0xa2/0x190 [ 1225.819953][ C1] tick_sched_timer+0x53/0x140 [ 1225.824884][ C1] __hrtimer_run_queues+0x364/0xe40 [ 1225.830091][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 1225.835393][ C1] ? hrtimer_init+0x330/0x330 [ 1225.840084][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1225.845834][ C1] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 1225.852018][ C1] hrtimer_interrupt+0x314/0x770 [ 1225.857124][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 1225.862797][ C1] apic_timer_interrupt+0xf/0x20 [ 1225.867741][ C1] [ 1225.870793][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x50 [ 1225.876867][ C1] Code: 04 25 c0 1e 02 00 48 8b 80 98 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 65 48 8b 04 25 c0 1e 02 00 <65> 8b 15 14 27 8d 7e 81 e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 80 [ 1225.896570][ C1] RSP: 0018:ffffc90002067870 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 1225.904991][ C1] RAX: ffff88807c3ac380 RBX: ffff8880a8953ac0 RCX: ffffffff81bd09dd [ 1225.912969][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 1225.920949][ C1] RBP: ffffc90002067870 R08: ffff88807c3ac380 R09: ffffed10118b2e85 [ 1225.929050][ C1] R10: ffffed10118b2e84 R11: ffff88808c597427 R12: 0000000000000002 [ 1225.937040][ C1] R13: ffff88808c597348 R14: 0000000000000000 R15: 00000000000000d6 [ 1225.945103][ C1] ? do_iter_write+0x25d/0x610 [ 1225.949905][ C1] do_iter_write+0x26b/0x610 [ 1225.954642][ C1] ? __kmalloc+0x608/0x770 [ 1225.959090][ C1] vfs_iter_write+0x77/0xb0 [ 1225.963718][ C1] iter_file_splice_write+0x717/0xc10 [ 1225.969336][ C1] ? page_cache_pipe_buf_release+0x290/0x290 [ 1225.975403][ C1] ? rw_verify_area+0x126/0x360 [ 1225.980275][ C1] ? page_cache_pipe_buf_release+0x290/0x290 [ 1225.986394][ C1] direct_splice_actor+0x123/0x190 [ 1225.991521][ C1] splice_direct_to_actor+0x3b4/0xa30 [ 1225.996911][ C1] ? generic_pipe_buf_nosteal+0x10/0x10 [ 1226.002481][ C1] ? do_splice_to+0x180/0x180 [ 1226.007292][ C1] ? rw_verify_area+0x126/0x360 [ 1226.012162][ C1] do_splice_direct+0x1da/0x2a0 [ 1226.017118][ C1] ? splice_direct_to_actor+0xa30/0xa30 [ 1226.022685][ C1] ? rcu_read_lock_any_held+0xcd/0xf0 [ 1226.028172][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1226.034492][ C1] ? __this_cpu_preempt_check+0x35/0x190 [ 1226.040152][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1226.046410][ C1] ? __sb_start_write+0x1e5/0x460 [ 1226.051497][ C1] do_sendfile+0x597/0xd00 [ 1226.056025][ C1] ? do_compat_pwritev64+0x1c0/0x1c0 [ 1226.061350][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1226.066838][ C1] __x64_sys_sendfile64+0x1dd/0x220 [ 1226.072050][ C1] ? __ia32_sys_sendfile+0x230/0x230 [ 1226.077350][ C1] ? do_syscall_64+0xae/0x790 [ 1226.082041][ C1] ? do_syscall_64+0xc0/0x790 [ 1226.086731][ C1] do_syscall_64+0xfa/0x790 [ 1226.091255][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1226.097153][ C1] RIP: 0033:0x4419e9 [ 1226.101058][ C1] Code: e8 7c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1226.120671][ C1] RSP: 002b:00007ffc2dc15cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 1226.129099][ C1] RAX: ffffffffffffffda RBX: 00007ffc2dc15e80 RCX: 00000000004419e9 [ 1226.137215][ C1] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 [ 1226.145387][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1226.153379][ C1] R10: 00008000fffffffe R11: 0000000000000246 R12: 0000000000000000 [ 1226.161362][ C1] R13: 00000000004026c0 R14: 0000000000000000 R15: 0000000000000000 [ 1226.169494][ C1] rcu: rcu_preempt kthread starved for 10544 jiffies! g11349 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 1226.180682][ C1] rcu: RCU grace-period kthread stack dump: [ 1226.186584][ C1] rcu_preempt R running task 28960 10 2 0x80004000 [ 1226.194507][ C1] Call Trace: [ 1226.197956][ C1] __schedule+0x934/0x1f90 [ 1226.202401][ C1] ? __sched_text_start+0x8/0x8 [ 1226.207257][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1226.213087][ C1] ? schedule_timeout+0x47c/0xc50 [ 1226.218202][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1226.223504][ C1] schedule+0xdc/0x2b0 [ 1226.227590][ C1] schedule_timeout+0x486/0xc50 [ 1226.232458][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1226.238283][ C1] ? usleep_range+0x170/0x170 [ 1226.243032][ C1] ? trace_hardirqs_on+0x67/0x240 [ 1226.248074][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 1226.253682][ C1] ? swake_up_one+0x60/0x60 [ 1226.258345][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 1226.263138][ C1] ? rcu_barrier+0x350/0x350 [ 1226.267879][ C1] ? trace_hardirqs_on+0x67/0x240 [ 1226.272927][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1226.279263][ C1] ? __kthread_parkme+0x108/0x1c0 [ 1226.285257][ C1] ? __kasan_check_read+0x11/0x20 [ 1226.290292][ C1] kthread+0x361/0x430 [ 1226.294381][ C1] ? rcu_barrier+0x350/0x350 [ 1226.299110][ C1] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 1226.304837][ C1] ret_from_fork+0x24/0x30