[info] Using makefile-style concurrent boot in runlevel 2. [ 24.755712] audit: type=1800 audit(1543911588.926:21): pid=5828 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 res=0 [ 24.782110] audit: type=1800 audit(1543911588.926:22): pid=5828 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2447 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?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: [ 31.260782] sshd (5967) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.0.92' (ECDSA) to the list of known hosts. executing program executing program [ 425.663312] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. executing program [ 425.719781] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 425.755172] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 575.389716] INFO: task syz-executor852:6003 blocked for more than 140 seconds. [ 575.397347] Not tainted 4.20.0-rc4+ #324 [ 575.401998] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 575.409990] syz-executor852 D20984 6003 5985 0x00000004 [ 575.415666] Call Trace: [ 575.418309] __schedule+0x8cf/0x21d0 [ 575.422075] ? print_usage_bug+0xc0/0xc0 [ 575.426140] ? __sched_text_start+0x8/0x8 [ 575.430455] ? __lock_acquire+0x62f/0x4c20 [ 575.434684] ? zap_class+0x640/0x640 [ 575.438388] ? print_usage_bug+0xc0/0xc0 [ 575.442536] ? __lock_acquire+0x62f/0x4c20 [ 575.446765] ? print_usage_bug+0xc0/0xc0 [ 575.450860] ? find_held_lock+0x36/0x1c0 [ 575.454914] ? zap_class+0x640/0x640 [ 575.458620] schedule+0xfe/0x460 [ 575.462020] ? find_held_lock+0x36/0x1c0 [ 575.466075] ? __schedule+0x21d0/0x21d0 [ 575.470093] ? find_held_lock+0x36/0x1c0 [ 575.474148] ? mark_held_locks+0xc7/0x130 [ 575.478296] schedule_timeout+0x1cc/0x260 [ 575.482594] ? usleep_range+0x1a0/0x1a0 [ 575.486558] ? wait_for_completion+0x41f/0x8a0 [ 575.491211] ? trace_hardirqs_off_caller+0x310/0x310 [ 575.496414] wait_for_completion+0x427/0x8a0 [ 575.500899] ? __save_stack_trace+0x8d/0xf0 [ 575.505642] ? wait_for_completion_interruptible+0x840/0x840 [ 575.511723] ? wake_up_q+0x100/0x100 [ 575.515458] ? save_stack+0xa9/0xd0 [ 575.519231] ? save_stack+0x43/0xd0 [ 575.522912] ? __kasan_slab_free+0x102/0x150 [ 575.527344] ? kasan_slab_free+0xe/0x10 [ 575.531351] ? kfree+0xcf/0x230 [ 575.534621] ? print_usage_bug+0xc0/0xc0 [ 575.538720] ? __sock_release+0xd7/0x250 [ 575.542823] ? sock_close+0x19/0x20 [ 575.546470] ? __fput+0x385/0xa30 [ 575.549956] ? ____fput+0x15/0x20 [ 575.553420] ? task_work_run+0x1e8/0x2a0 [ 575.557508] tls_sw_free_resources_tx+0x52b/0xcf0 [ 575.562402] ? trace_hardirqs_on+0x310/0x310 [ 575.566862] ? tls_sw_stream_read+0x4a0/0x4a0 [ 575.571424] ? mark_held_locks+0xc7/0x130 [ 575.575567] ? kfree+0x11e/0x230 [ 575.578919] ? kfree+0x11e/0x230 [ 575.582324] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 575.586901] ? trace_hardirqs_on+0xbd/0x310 [ 575.591289] ? tls_sk_proto_close+0x5fa/0x750 [ 575.595778] ? trace_hardirqs_off_caller+0x310/0x310 [ 575.600953] ? __kasan_slab_free+0x119/0x150 [ 575.605362] ? tls_sk_proto_close+0x5fa/0x750 [ 575.609910] tls_sk_proto_close+0x602/0x750 [ 575.614600] ? tcp_check_oom+0x530/0x530 [ 575.618665] ? tls_push_pending_closed_record+0x240/0x240 [ 575.624313] ? ipv6_sock_mc_close+0x162/0x1d0 [ 575.628824] ? ip_mc_drop_socket+0x20b/0x270 [ 575.633271] ? down_write+0x8a/0x130 [ 575.636979] inet_release+0x104/0x1f0 [ 575.640852] inet6_release+0x50/0x70 [ 575.644560] __sock_release+0xd7/0x250 [ 575.648437] ? __sock_release+0x250/0x250 [ 575.652649] sock_close+0x19/0x20 [ 575.656092] __fput+0x385/0xa30 [ 575.659361] ? get_max_files+0x20/0x20 [ 575.663433] ? trace_hardirqs_on+0xbd/0x310 [ 575.667819] ? kasan_check_read+0x11/0x20 [ 575.672058] ? task_work_run+0x1af/0x2a0 [ 575.676115] ? trace_hardirqs_off_caller+0x310/0x310 [ 575.681263] ? filp_close+0x1cd/0x250 [ 575.685060] ____fput+0x15/0x20 [ 575.688330] task_work_run+0x1e8/0x2a0 [ 575.692267] ? task_work_cancel+0x240/0x240 [ 575.696640] ? copy_fd_bitmaps+0x210/0x210 [ 575.700938] ? do_syscall_64+0x9a/0x820 [ 575.704904] exit_to_usermode_loop+0x318/0x380 [ 575.709531] ? __bpf_trace_sys_exit+0x30/0x30 [ 575.714093] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 575.719802] do_syscall_64+0x6be/0x820 [ 575.723688] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 575.729038] ? syscall_return_slowpath+0x5e0/0x5e0 [ 575.734121] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 575.738968] ? trace_hardirqs_on_caller+0x310/0x310 [ 575.744047] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 575.749053] ? prepare_exit_to_usermode+0x291/0x3b0 [ 575.754116] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 575.758957] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 575.764192] RIP: 0033:0x400fe0 [ 575.767375] Code: 01 f0 ff ff 0f 83 b0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d ed 16 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 0a 00 00 c3 48 83 ec 08 e8 3a 01 00 00 [ 575.786504] RSP: 002b:00007ffe30095a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 575.794250] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000400fe0 [ 575.801677] RDX: 0000000000000058 RSI: 0000000020000000 RDI: 0000000000000003 [ 575.809013] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000004002c8 [ 575.816363] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000067edd [ 575.823656] R13: 0000000000401f80 R14: 0000000000000000 R15: 0000000000000000 [ 575.831009] [ 575.831009] Showing all locks held in the system: [ 575.837339] 1 lock held by khungtaskd/1020: [ 575.841711] #0: 0000000034ca4b1e (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 [ 575.850429] 1 lock held by rsyslogd/5866: [ 575.854613] #0: 00000000f2b3f94d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 [ 575.862668] 2 locks held by getty/5956: [ 575.866773] #0: 000000000ac99831 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 575.875083] #1: 00000000d09933e4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 575.884112] 2 locks held by getty/5957: [ 575.888066] #0: 000000005f0193c3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 575.896342] #1: 00000000f88a15c8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 575.905228] 2 locks held by getty/5958: [ 575.909518] #0: 00000000794f4a79 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 575.917779] #1: 000000002fefcb05 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 575.926758] 2 locks held by getty/5959: [ 575.930766] #0: 0000000074eb97d6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 575.938997] #1: 0000000065ce552e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 575.948316] 2 locks held by getty/5960: [ 575.952325] #0: 00000000c84b7e95 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 575.960653] #1: 0000000020f1a59d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 575.969528] 2 locks held by getty/5961: [ 575.973603] #0: 00000000c90dcbd8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 575.981933] #1: 00000000409d1c2e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 575.990817] 2 locks held by getty/5962: [ 575.994780] #0: 000000006f39f77f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 576.003237] #1: 00000000c23bd515 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 [ 576.012117] 2 locks held by syz-executor852/6003: [ 576.016940] #0: 000000005aa3007c (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x8b/0x250 [ 576.026495] #1: 0000000097a7edc0 (sk_lock-AF_INET6){+.+.}, at: tls_sk_proto_close+0xf5/0x750 [ 576.035232] [ 576.036851] ============================================= [ 576.036851] [ 576.043936] NMI backtrace for cpu 0 [ 576.047553] CPU: 0 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc4+ #324 [ 576.054546] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 576.064132] Call Trace: [ 576.066785] dump_stack+0x244/0x39d [ 576.070404] ? dump_stack_print_info.cold.1+0x20/0x20 [ 576.075615] ? check_preemption_disabled+0x48/0x280 [ 576.080719] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 576.086263] nmi_cpu_backtrace.cold.2+0x5c/0xa1 [ 576.090994] ? lapic_can_unplug_cpu.cold.27+0x3f/0x3f [ 576.096184] nmi_trigger_cpumask_backtrace+0x1e8/0x22a [ 576.101454] arch_trigger_cpumask_backtrace+0x14/0x20 [ 576.106637] watchdog+0xb51/0x1060 [ 576.110178] ? hungtask_pm_notify+0xb0/0xb0 [ 576.114492] ? __kthread_parkme+0xce/0x1a0 [ 576.118792] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 576.123887] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 576.128985] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 576.133789] ? trace_hardirqs_on+0xbd/0x310 [ 576.138105] ? kasan_check_read+0x11/0x20 [ 576.142243] ? __kthread_parkme+0xce/0x1a0 [ 576.146465] ? trace_hardirqs_off_caller+0x310/0x310 [ 576.151556] ? trace_hardirqs_off_caller+0x310/0x310 [ 576.156644] ? lockdep_init_map+0x9/0x10 [ 576.160776] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 576.165885] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 576.171415] ? __kthread_parkme+0xfb/0x1a0 [ 576.175716] ? hungtask_pm_notify+0xb0/0xb0 [ 576.180036] kthread+0x35a/0x440 [ 576.183393] ? kthread_stop+0x900/0x900 [ 576.187361] ret_from_fork+0x3a/0x50 [ 576.191229] Sending NMI from CPU 0 to CPUs 1: [ 576.195810] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 [ 576.196750] Kernel panic - not syncing: hung_task: blocked tasks [ 576.209595] CPU: 0 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc4+ #324 [ 576.216824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 576.226228] Call Trace: [ 576.228821] dump_stack+0x244/0x39d [ 576.232444] ? dump_stack_print_info.cold.1+0x20/0x20 [ 576.237626] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 576.242704] panic+0x2ad/0x55c [ 576.245892] ? add_taint.cold.5+0x16/0x16 [ 576.250035] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 576.255562] ? nmi_trigger_cpumask_backtrace+0x1d1/0x22a [ 576.261003] ? nmi_trigger_cpumask_backtrace+0x1c8/0x22a [ 576.266457] watchdog+0xb62/0x1060 [ 576.270000] ? hungtask_pm_notify+0xb0/0xb0 [ 576.274433] ? __kthread_parkme+0xce/0x1a0 [ 576.278666] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 576.283755] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 576.288905] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 576.293489] ? trace_hardirqs_on+0xbd/0x310 [ 576.297803] ? kasan_check_read+0x11/0x20 [ 576.301960] ? __kthread_parkme+0xce/0x1a0 [ 576.306188] ? trace_hardirqs_off_caller+0x310/0x310 [ 576.311284] ? trace_hardirqs_off_caller+0x310/0x310 [ 576.316398] ? lockdep_init_map+0x9/0x10 [ 576.320534] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 576.325729] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 576.331259] ? __kthread_parkme+0xfb/0x1a0 [ 576.335487] ? hungtask_pm_notify+0xb0/0xb0 [ 576.340037] kthread+0x35a/0x440 [ 576.343395] ? kthread_stop+0x900/0x900 [ 576.347360] ret_from_fork+0x3a/0x50 [ 576.352657] Kernel Offset: disabled [ 576.356328] Rebooting in 86400 seconds..