[....] Starting enhanced syslogd: rsyslogd[ 11.324146] audit: type=1400 audit(1513985892.192:5): avc: denied { syslog } for pid=2995 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 15.623692] audit: type=1400 audit(1513985896.492:6): avc: denied { map } for pid=3133 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 'ci-upstream-mmots-kasan-gce-5,10.128.0.18' (ECDSA) to the list of known hosts. 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 executing program executing program executing program executing program executing program executing program executing program [ 350.499994] audit: type=1400 audit(1513986231.368:7): avc: denied { map } for pid=3151 comm="syzkaller626814" path="/root/syzkaller626814968" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 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 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 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 executing program [ 475.607031] INFO: rcu_sched self-detected stall on CPU [ 475.612501] 1-...!: (124998 ticks this GP) idle=1aa/1/4611686018427387906 softirq=6401/6401 fqs=178 [ 475.621880] (t=125000 jiffies g=3233 c=3232 q=384) [ 475.627003] rcu_sched kthread starved for 124263 jiffies! g3233 c3232 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 [ 475.637379] rcu_sched R running task 23272 8 2 0x80000000 [ 475.644573] Call Trace: [ 475.647153] __schedule+0x8eb/0x2060 [ 475.650862] ? __sched_text_start+0x8/0x8 [ 475.654992] ? __mod_timer+0x317/0x16e0 [ 475.658958] ? trace_event_raw_event_timer_start+0x360/0x360 [ 475.664734] ? __debug_object_init+0x235/0x1040 [ 475.669399] ? debug_object_fixup+0x30/0x30 [ 475.673711] ? find_held_lock+0x35/0x1d0 [ 475.677763] schedule+0xf5/0x430 [ 475.681117] ? __schedule+0x2060/0x2060 [ 475.685072] ? lock_downgrade+0x980/0x980 [ 475.689210] ? lock_release+0xa40/0xa40 [ 475.693169] ? find_held_lock+0x35/0x1d0 [ 475.697217] ? __lockdep_init_map+0xe4/0x650 [ 475.701618] ? lockdep_init_map+0x9/0x10 [ 475.705665] ? init_timer_on_stack_key+0xb7/0xe0 [ 475.710446] schedule_timeout+0x13e/0x6f0 [ 475.714588] ? prepare_to_swait+0x18f/0x4f0 [ 475.718899] ? usleep_range+0x190/0x190 [ 475.722904] ? __init_swait_queue_head+0x140/0x140 [ 475.727820] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 475.732927] ? __next_timer_interrupt+0x150/0x150 [ 475.737772] rcu_gp_kthread+0x9dd/0x18e0 [ 475.741814] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 475.747013] ? rcu_batches_completed_sched+0x10/0x10 [ 475.752096] ? down_timeout+0x61/0x80 [ 475.755881] ? switched_to_fair+0xb0/0xb0 [ 475.760011] ? check_noncircular+0x20/0x20 [ 475.764228] ? check_noncircular+0x20/0x20 [ 475.768438] ? check_noncircular+0x20/0x20 [ 475.772658] ? pick_next_entity+0x197/0x400 [ 475.776967] ? down_timeout+0x60/0x80 [ 475.780759] ? finish_task_switch+0x1d3/0x740 [ 475.785238] ? __lock_acquire+0x292/0x3e00 [ 475.789453] ? load_balance+0x34c0/0x34c0 [ 475.793582] ? check_noncircular+0x20/0x20 [ 475.797802] ? lock_release+0xa40/0xa40 [ 475.801755] ? compat_start_thread+0x80/0x80 [ 475.806146] ? do_raw_spin_trylock+0x190/0x190 [ 475.810710] ? _raw_spin_unlock_irq+0x27/0x70 [ 475.815188] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 475.820187] ? trace_hardirqs_on+0xd/0x10 [ 475.824317] ? mmdrop+0x18/0x30 [ 475.827575] ? finish_task_switch+0x1f6/0x740 [ 475.832056] ? copy_overflow+0x20/0x20 [ 475.835942] ? __schedule+0x8f3/0x2060 [ 475.839842] ? find_held_lock+0x35/0x1d0 [ 475.843898] ? find_held_lock+0x35/0x1d0 [ 475.847951] ? complete+0x62/0x80 [ 475.851398] ? __schedule+0x2060/0x2060 [ 475.855350] ? do_wait_intr_irq+0x3e0/0x3e0 [ 475.859651] ? __lockdep_init_map+0xe4/0x650 [ 475.864042] ? do_raw_spin_trylock+0x190/0x190 [ 475.868612] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 475.873612] ? trace_hardirqs_on+0xd/0x10 [ 475.877738] ? __kthread_parkme+0x175/0x240 [ 475.882046] kthread+0x33c/0x400 [ 475.885395] ? rcu_batches_completed_sched+0x10/0x10 [ 475.890482] ? kthread_stop+0x7a0/0x7a0 [ 475.894440] ret_from_fork+0x24/0x30 [ 475.898164] NMI backtrace for cpu 1 [ 475.901771] CPU: 1 PID: 3169 Comm: syzkaller626814 Not tainted 4.15.0-rc4-mm1+ #49 [ 475.909452] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 475.918788] Call Trace: [ 475.921350] [ 475.923484] dump_stack+0x194/0x257 [ 475.927098] ? arch_local_irq_restore+0x53/0x53 [ 475.931749] ? lock_release+0xa40/0xa40 [ 475.935703] ? nmi_cpu_backtrace+0x1be/0x210 [ 475.940098] ? lapic_can_unplug_cpu+0xa0/0xa0 [ 475.944573] nmi_cpu_backtrace+0x1d2/0x210 [ 475.948794] ? lapic_can_unplug_cpu+0xa0/0xa0 [ 475.953271] nmi_trigger_cpumask_backtrace+0x122/0x180 [ 475.958534] arch_trigger_cpumask_backtrace+0x14/0x20 [ 475.963704] rcu_dump_cpu_stacks+0x186/0x1de [ 475.968110] check_cpu_stall.isra.62+0xbb8/0x15b0 [ 475.972952] ? rcu_lockdep_current_cpu_online+0x190/0x190 [ 475.978485] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 475.983675] ? find_held_lock+0x35/0x1d0 [ 475.987731] ? check_noncircular+0x20/0x20 [ 475.991946] ? lock_downgrade+0x980/0x980 [ 475.996071] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 476.001245] ? lock_release+0xa40/0xa40 [ 476.005214] ? check_noncircular+0x20/0x20 [ 476.009445] ? check_noncircular+0x20/0x20 [ 476.013674] ? cpuacct_account_field+0x1e4/0x3b0 [ 476.018435] ? check_noncircular+0x20/0x20 [ 476.022648] ? find_held_lock+0x35/0x1d0 [ 476.026693] ? __acct_update_integrals+0x339/0x4d0 [ 476.031610] ? __lock_is_held+0xb6/0x140 [ 476.035674] rcu_check_callbacks+0x238/0xd20 [ 476.040072] ? rcu_cpu_stall_reset+0x260/0x260 [ 476.044641] ? trace_hardirqs_off+0xd/0x10 [ 476.048856] ? raise_softirq+0x325/0x490 [ 476.052902] ? raise_softirq_irqoff+0x320/0x320 [ 476.057556] ? read_boot_clock64+0x70/0x70 [ 476.061791] ? lock_downgrade+0x980/0x980 [ 476.065922] ? lock_downgrade+0x980/0x980 [ 476.070059] ? run_local_timers+0x18d/0x200 [ 476.074358] ? timer_clear_idle+0x50/0x50 [ 476.078486] ? account_process_tick+0xd4/0x3e0 [ 476.083051] ? thread_group_cputime+0xef0/0xef0 [ 476.087700] ? ktime_get_resolution_ns+0x300/0x300 [ 476.092625] update_process_times+0x30/0x60 [ 476.096931] tick_sched_handle+0x85/0x160 [ 476.101060] tick_sched_timer+0x42/0x120 [ 476.105114] __hrtimer_run_queues+0x358/0xe20 [ 476.109601] ? tick_sched_do_timer+0xe0/0xe0 [ 476.113999] ? hrtimer_fixup_init+0x70/0x70 [ 476.118315] ? pvclock_read_flags+0x160/0x160 [ 476.122809] ? kvm_clock_get_cycles+0x25/0x30 [ 476.127284] ? ktime_get_update_offsets_now+0x34a/0x520 [ 476.132637] ? do_timer+0x50/0x50 [ 476.136074] ? native_apic_msr_write+0x5c/0x80 [ 476.140638] ? do_raw_spin_trylock+0x190/0x190 [ 476.145205] ? rcu_idle_enter+0x530/0x530 [ 476.149335] ? clockevents_program_event+0x108/0x2e0 [ 476.154442] hrtimer_interrupt+0x1c2/0x5e0 [ 476.158687] smp_apic_timer_interrupt+0x14a/0x700 [ 476.163513] ? smp_call_function_single_interrupt+0x640/0x640 [ 476.169381] ? _raw_spin_lock+0x32/0x40 [ 476.173341] ? _raw_spin_unlock+0x22/0x30 [ 476.177470] ? handle_edge_irq+0x2b4/0x7c0 [ 476.181687] ? task_prio+0x40/0x40 [ 476.185221] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 476.190054] apic_timer_interrupt+0xa9/0xb0 [ 476.194352] [ 476.196569] RIP: 0010:n_tty_ioctl+0x218/0x2d0 [ 476.201038] RSP: 0018:ffff8801c914fb48 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11 [ 476.208728] RAX: 0000000000000643 RBX: ffffc900018c3060 RCX: ffffffff8293be5c [ 476.215978] RDX: 0000000000000000 RSI: 00000000749d30db RDI: ffffc900018c4260 [ 476.223229] RBP: ffff8801c914fb88 R08: 1ffff10039229e99 R09: 0000000000000004 [ 476.230565] R10: ffff8801c914f988 R11: 0000000000000003 R12: ffffc900018c2000 [ 476.237815] R13: 00000002e0efd643 R14: 0000000020a6bffc R15: ffff8801c8493938 [ 476.245082] ? n_tty_ioctl+0x20c/0x2d0 [ 476.248957] ? n_tty_ioctl+0x20c/0x2d0 [ 476.252836] tty_ioctl+0x336/0x1610 [ 476.256440] ? commit_echoes+0x1b0/0x1b0 [ 476.260486] ? tty_vhangup+0x30/0x30 [ 476.264180] ? __lock_is_held+0xb6/0x140 [ 476.268241] ? __fget+0x35c/0x570 [ 476.271697] ? file_has_perm+0x1ee/0x5d0 [ 476.275756] ? tty_vhangup+0x30/0x30 [ 476.279455] do_vfs_ioctl+0x1b1/0x1520 [ 476.283322] ? _cond_resched+0x14/0x30 [ 476.287198] ? ioctl_preallocate+0x2b0/0x2b0 [ 476.291593] ? selinux_capable+0x40/0x40 [ 476.295643] ? SyS_futex+0x269/0x390 [ 476.299360] ? security_file_ioctl+0x89/0xb0 [ 476.303756] SyS_ioctl+0x8f/0xc0 [ 476.307111] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 476.311844] RIP: 0033:0x445b39 [ 476.315012] RSP: 002b:00007f6ed1479d18 EFLAGS: 00000293 ORIG_RAX: 0000000000000010 [ 476.322699] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445b39 [ 476.329948] RDX: 0000000020a6bffc RSI: 000000000000541b RDI: 0000000000000013 [ 476.337196] RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 [ 476.344448] R10: 0000000000000000 R11: 0000000000000293 R12: 6d74702f7665642f [ 476.351697] R13: 00007ffe16e1657f R14: 00007f6ed147a9c0 R15: 0000000000000008