[ 49.965859] audit: type=1800 audit(1583083246.519:30): pid=8141 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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 syzkaller login: [ 54.717534] kauditd_printk_skb: 4 callbacks suppressed [ 54.717549] audit: type=1400 audit(1583083251.289:35): avc: denied { map } for pid=8314 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program [ 674.762066] audit: type=1400 audit(1583083871.339:36): avc: denied { map } for pid=8326 comm="syz-executor855" path="/root/syz-executor855303590" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 674.813961] hrtimer: interrupt took 52692 ns [ 674.818724] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. [ 675.247995] kvm: emulating exchange as write executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 782.650944] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 782.657291] rcu: (detected by 1, t=10502 jiffies, g=7029, q=9) [ 782.663470] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295015275-4295004773), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 782.676207] syz-executor855 R running task 28120 8454 8328 0x00000800 [ 782.683435] Call Trace: [ 782.686031] [ 782.688199] sched_show_task.cold+0x2e2/0x343 [ 782.692761] ? set_rq_offline.part.0+0x140/0x140 [ 782.697557] rcu_check_callbacks.cold+0xaf0/0xddc [ 782.702434] update_process_times+0x2a/0x70 [ 782.706787] tick_sched_handle+0x9b/0x180 [ 782.710956] tick_sched_timer+0x42/0x130 [ 782.715133] __hrtimer_run_queues+0x2fc/0xd50 [ 782.719668] ? tick_sched_do_timer+0x1a0/0x1a0 [ 782.724284] ? hrtimer_fixup_activate+0x30/0x30 [ 782.728971] ? kvm_clock_read+0x14/0x30 [ 782.732986] ? ktime_get_update_offsets_now+0x2db/0x450 [ 782.738380] hrtimer_interrupt+0x312/0x770 [ 782.742739] smp_apic_timer_interrupt+0x10c/0x550 [ 782.747742] apic_timer_interrupt+0xf/0x20 [ 782.752009] [ 782.754536] RIP: 0010:vcpu_enter_guest+0xed3/0x5ed0 [ 782.760444] Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 cb 44 00 00 48 83 3d 67 2f a6 07 00 0f 84 c0 36 00 00 e8 84 71 5b 00 fb 66 0f 1f 44 00 00 01 00 00 00 e8 13 73 3a 00 65 8b 1d 7c c6 f5 7e 31 ff 89 de e8 [ 782.783224] RSP: 0018:ffff88809fa37a30 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 782.792703] RAX: ffff88809f51e540 RBX: ffff88809f51e540 RCX: 1ffff11013ea3dbc [ 782.800863] RDX: 0000000000000000 RSI: ffffffff810c273c RDI: ffff88809f51edbc [ 782.808164] RBP: ffff88809fa37b40 R08: ffff88809f51e540 R09: 0000000000000000 [ 782.815538] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a4f306c0 [ 782.823032] R13: ffff8880a4f306ec R14: fffffe92e03ed1ee R15: 0000000000000000 [ 782.830356] ? vcpu_enter_guest+0xecc/0x5ed0 [ 782.834801] ? lockdep_hardirqs_on+0x40b/0x5d0 [ 782.839419] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 782.844213] ? emulator_read_emulated+0x40/0x40 [ 782.848911] ? kvm_check_async_pf_completion+0x2a4/0x400 [ 782.854404] ? kvm_arch_vcpu_ioctl_run+0x452/0x16a0 [ 782.859448] ? kvm_arch_vcpu_ioctl_run+0x446/0x16a0 [ 782.864498] kvm_arch_vcpu_ioctl_run+0x446/0x16a0 [ 782.869367] kvm_vcpu_ioctl+0x493/0xe20 [ 782.873386] ? kvm_vcpu_block+0xc40/0xc40 [ 782.878002] ? mark_held_locks+0xf0/0xf0 [ 782.882196] ? signal_setup_done+0xb6/0x290 [ 782.886534] ? set_current_blocked+0x40/0x40 [ 782.891122] ? find_held_lock+0x2d/0x110 [ 782.895218] ? __fget+0x319/0x510 [ 782.898690] ? kvm_vcpu_block+0xc40/0xc40 [ 782.902868] do_vfs_ioctl+0xcda/0x12e0 [ 782.906783] ? selinux_file_ioctl+0x125/0x5d0 [ 782.911408] ? check_preemption_disabled+0x41/0x280 [ 782.916466] ? ioctl_preallocate+0x200/0x200 [ 782.921427] ? selinux_file_mprotect+0x600/0x600 [ 782.926206] ? __fget+0x340/0x510 [ 782.929695] ? iterate_fd+0x350/0x350 [ 782.933517] ? __x64_sys_futex+0x37c/0x4f0 [ 782.937775] ? __x64_sys_futex+0x386/0x4f0 [ 782.942040] ? security_file_ioctl+0x6c/0xb0 [ 782.946476] ksys_ioctl+0x9b/0xc0 [ 782.950248] __x64_sys_ioctl+0x6f/0xb0 [ 782.954158] ? lockdep_hardirqs_on+0x40b/0x5d0 [ 782.958777] do_syscall_64+0xf9/0x620 [ 782.962633] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 782.968006] RIP: 0033:0x44a9e9 [ 782.971219] Code: e8 ec 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 1b ff fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 782.990235] RSP: 002b:00007f0d0e1e4ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 782.998106] RAX: ffffffffffffffda RBX: 00000000006dfc58 RCX: 000000000044a9e9 [ 783.005521] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000008 [ 783.012868] RBP: 00000000006dfc50 R08: 0000000000000000 R09: 0000000000000000 [ 783.020157] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dfc5c [ 783.027472] R13: 00007ffec2d9748f R14: 00007f0d0e1e59c0 R15: 0000000000000005 [ 783.034781] rcu: rcu_preempt kthread starved for 10502 jiffies! g7029 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 783.045192] rcu: RCU grace-period kthread stack dump: [ 783.050398] rcu_preempt R running task 29152 10 2 0x80000000 [ 783.057707] Call Trace: [ 783.060387] ? __schedule+0x866/0x1d80 [ 783.064302] ? schedule_timeout+0x4c3/0xf20 [ 783.068830] ? firmware_map_remove+0x19a/0x19a [ 783.073447] ? _raw_spin_unlock_irqrestore+0x67/0xe0 [ 783.078585] schedule+0x8d/0x1b0 [ 783.081973] schedule_timeout+0x4d1/0xf20 [ 783.086153] ? usleep_range+0x160/0x160 [ 783.090153] ? __next_timer_interrupt+0x190/0x190 [ 783.095051] ? prepare_to_swait_exclusive+0x110/0x110 [ 783.100260] rcu_gp_kthread+0xcee/0x2060 [ 783.104363] ? rcu_blocking_is_gp+0x90/0x90 [ 783.108704] ? _raw_spin_unlock_irqrestore+0x67/0xe0 [ 783.113847] ? lockdep_hardirqs_on+0x40b/0x5d0 [ 783.118546] ? _raw_spin_unlock_irqrestore+0xa0/0xe0 [ 783.123662] ? __kthread_parkme+0xfd/0x1b0 [ 783.127937] ? rcu_blocking_is_gp+0x90/0x90 [ 783.132290] kthread+0x34a/0x420 [ 783.135767] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 783.141324] ret_from_fork+0x24/0x30