INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] 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 Warning: Permanently added 'ci-upstream-next-kasan-gce-1,10.128.15.194' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 615.392157] INFO: task syzkaller137134:3046 blocked for more than 120 seconds. [ 615.399683] Not tainted 4.13.0-rc6-next-20170825+ #9 [ 615.405519] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 615.413508] syzkaller137134 D24216 3046 3040 0x00000004 [ 615.419209] Call Trace: [ 615.421837] __schedule+0x8e8/0x2070 [ 615.425585] ? __sched_text_start+0x8/0x8 [ 615.429748] ? prepare_to_wait_exclusive+0xb6/0x530 [ 615.434798] ? find_held_lock+0x39/0x1d0 [ 615.438887] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 615.443925] ? trace_hardirqs_on+0xd/0x10 [ 615.448103] schedule+0x108/0x440 [ 615.451574] ? __schedule+0x2070/0x2070 [ 615.455566] ? mark_held_locks+0xb2/0x100 [ 615.459749] ? __local_bh_enable_ip+0x9d/0x160 [ 615.464350] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.469401] ? __lock_sock+0x1d7/0x2f0 [ 615.473303] ? trace_hardirqs_on+0xd/0x10 [ 615.477482] ? __local_bh_enable_ip+0x9d/0x160 [ 615.482090] __lock_sock+0x1dc/0x2f0 [ 615.485831] ? proto_unregister+0x5e0/0x5e0 [ 615.490174] ? finish_wait+0x490/0x490 [ 615.494080] ? lock_sock_nested+0x44/0x110 [ 615.498330] lock_sock_nested+0xf3/0x110 [ 615.502441] tcp_sendmsg+0x21/0x50 [ 615.506046] inet_sendmsg+0x11f/0x5e0 [ 615.509893] ? inet_recvmsg+0x5f0/0x5f0 [ 615.513893] ? selinux_socket_sendmsg+0x36/0x40 [ 615.518584] ? security_socket_sendmsg+0x89/0xb0 [ 615.523372] ? inet_recvmsg+0x5f0/0x5f0 [ 615.527384] sock_sendmsg+0xca/0x110 [ 615.531121] kernel_sendmsg+0x47/0x60 [ 615.534938] sock_no_sendpage+0x1cc/0x280 [ 615.539111] ? sock_no_shutdown+0x10/0x10 [ 615.543290] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.548336] tcp_sendpage_locked+0x10b/0x160 [ 615.552774] tcp_sendpage+0x43/0x60 [ 615.556422] ? tcp_sendpage_locked+0x160/0x160 [ 615.561043] inet_sendpage+0x1aa/0x660 [ 615.564964] ? inet_sendmsg+0x5e0/0x5e0 [ 615.568986] ? inet_sendmsg+0x5e0/0x5e0 [ 615.572993] kernel_sendpage+0x8d/0xe0 [ 615.576897] sock_sendpage+0x92/0xc0 [ 615.580632] ? kernel_sendpage+0xe0/0xe0 [ 615.584697] pipe_to_sendpage+0x290/0x3b0 [ 615.588858] ? direct_splice_actor+0x180/0x180 [ 615.593446] ? splice_from_pipe_next.part.9+0x22a/0x2e0 [ 615.598842] __splice_from_pipe+0x343/0x750 [ 615.603181] ? direct_splice_actor+0x180/0x180 [ 615.607792] splice_from_pipe+0x1e9/0x330 [ 615.611972] ? direct_splice_actor+0x180/0x180 [ 615.616573] ? splice_shrink_spd+0xb0/0xb0 [ 615.620831] ? security_file_permission+0x89/0x1f0 [ 615.625788] generic_splice_sendpage+0x40/0x50 [ 615.630381] ? splice_from_pipe+0x330/0x330 [ 615.634721] SyS_splice+0x7d5/0x1630 [ 615.638460] ? compat_SyS_vmsplice+0x250/0x250 [ 615.643061] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.648267] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 615.653104] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 615.657873] RIP: 0033:0x445469 [ 615.661074] RSP: 002b:00007f4df70cbdb8 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 [ 615.668803] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445469 [ 615.676090] RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 [ 615.683369] RBP: 0000000000000086 R08: 000000000000001f R09: 0000000000000000 [ 615.690654] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 [ 615.697944] R13: 00007ffff3c68f1f R14: 00007f4df70cc9c0 R15: 0000000000000000 [ 615.705259] [ 615.705259] Showing all locks held in the system: [ 615.711599] 2 locks held by khungtaskd/644: [ 615.715957] #0: (rcu_read_lock){....}, at: [] watchdog+0x1c5/0xd60 [ 615.724057] #1: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0xd2/0x410 [ 615.733123] 2 locks held by getty/3013: [ 615.737098] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.745804] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.755124] 2 locks held by getty/3014: [ 615.759117] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.767811] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.777154] 2 locks held by getty/3015: [ 615.781153] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.789883] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.799201] 2 locks held by getty/3016: [ 615.803190] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.811889] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.821208] 2 locks held by getty/3017: [ 615.825194] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.833910] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.843234] 2 locks held by getty/3018: [ 615.847400] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.856095] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.865410] 2 locks held by getty/3019: [ 615.869394] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.878117] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.887457] 2 locks held by syzkaller137134/3046: [ 615.892319] #0: (&pipe->mutex/1){+.+.}, at: [] pipe_wait+0x1e6/0x280 [ 615.900605] #1: (sk_lock-AF_INET){+.+.}, at: [] tcp_sendpage+0x2e/0x60 [ 615.909061] [ 615.910690] ============================================= [ 615.910690] [ 615.917732] NMI backtrace for cpu 0 [ 615.921373] CPU: 0 PID: 644 Comm: khungtaskd Not tainted 4.13.0-rc6-next-20170825+ #9 [ 615.929312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 615.938646] Call Trace: [ 615.942077] dump_stack+0x194/0x257 [ 615.945678] ? arch_local_irq_restore+0x53/0x53 [ 615.950331] nmi_cpu_backtrace+0x20e/0x240 [ 615.954546] ? kobject_synth_uevent+0xad0/0xad0 [ 615.959185] ? debug_check_no_locks_held+0x140/0x140 [ 615.964259] ? show_regs_print_info+0x65/0x65 [ 615.968731] ? irq_force_complete_move+0x390/0x390 [ 615.973630] nmi_trigger_cpumask_backtrace+0x122/0x180 [ 615.978883] arch_trigger_cpumask_backtrace+0x14/0x20 [ 615.984046] watchdog+0x90c/0xd60 [ 615.987480] ? reset_hung_task_detector+0xa0/0xa0 [ 615.992290] ? complete+0x18/0x80 [ 615.995720] ? __schedule+0x2070/0x2070 [ 615.999672] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 616.004749] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.009737] ? trace_hardirqs_on+0xd/0x10 [ 616.013856] ? __kthread_parkme+0x173/0x240 [ 616.018160] kthread+0x39c/0x470 [ 616.021497] ? reset_hung_task_detector+0xa0/0xa0 [ 616.026306] ? kthread_create_on_node+0x100/0x100 [ 616.031128] ret_from_fork+0x2a/0x40 [ 616.034890] Sending NMI from CPU 0 to CPUs 1: [ 616.039409] NMI backtrace for cpu 1 [ 616.039416] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0-rc6-next-20170825+ #9 [ 616.039418] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.039421] task: ffff8801d9f8a300 task.stack: ffff8801d9f90000 [ 616.039429] RIP: 0010:lock_release+0x1bf/0xd70 [ 616.039431] RSP: 0018:ffff8801db307ca8 EFLAGS: 00000082 [ 616.039434] RAX: 0000000000000000 RBX: 1ffff1003b660f9a RCX: 0000000000000000 [ 616.039436] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8801d9f8ab94 [ 616.039438] RBP: ffff8801db307e58 R08: 0000000000000000 R09: 0000000000000001 [ 616.039440] R10: 0000000000000000 R11: ffffffff8707ac60 R12: ffff8801d9f8a300 [ 616.039442] R13: ffff8801db307e30 R14: ffffffff8707cc88 R15: ffff8801d9f8a300 [ 616.039445] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 616.039447] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.039449] CR2: 0000000020844fe0 CR3: 00000001d3e48000 CR4: 00000000001406e0 [ 616.039453] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.039455] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.039456] Call Trace: [ 616.039458] [ 616.039466] ? rebalance_domains+0xcc0/0xcc0 [ 616.039470] ? tick_irq_enter+0x9e/0x390 [ 616.039474] ? lock_downgrade+0x990/0x990 [ 616.039479] ? lock_acquire+0x1d5/0x580 [ 616.039481] ? tick_irq_enter+0x9e/0x390 [ 616.039487] ? lock_release+0xd70/0xd70 [ 616.039491] ? __do_softirq+0x74d/0xbd0 [ 616.039500] ktime_get+0x144/0x3a0 [ 616.039503] ? tick_irq_enter+0x9e/0x390 [ 616.039508] ? lapic_next_event+0x5a/0x90 [ 616.039512] ? ktime_get_resolution_ns+0x300/0x300 [ 616.039517] ? hrtimer_interrupt+0x489/0x5f0 [ 616.039522] tick_irq_enter+0x9e/0x390 [ 616.039527] irq_enter+0xbd/0xe0 [ 616.039532] scheduler_ipi+0x8c/0x460 [ 616.039536] smp_reschedule_interrupt+0x61/0x80 [ 616.039540] reschedule_interrupt+0x9d/0xb0 [ 616.039541] [ 616.039545] RIP: 0010:native_safe_halt+0x6/0x10 [ 616.039546] RSP: 0018:ffff8801d9f97db0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 [ 616.039550] RAX: dffffc0000000000 RBX: 1ffff1003b3f2fb9 RCX: 0000000000000000 [ 616.039551] RDX: 1ffffffff0b59188 RSI: 0000000000000001 RDI: ffffffff85ac8c40 [ 616.039553] RBP: ffff8801d9f97db0 R08: ffffffff85804a88 R09: 0000000000000000 [ 616.039555] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac8c30 [ 616.039557] R13: ffff8801d9f97e68 R14: 0000000000000000 R15: ffff8801d9f8a300 [ 616.039564] default_idle+0xbf/0x460 [ 616.039568] ? __sched_text_end+0x4/0x4 [ 616.039573] ? tick_nohz_idle_enter+0xde/0x160 [ 616.039580] arch_cpu_idle+0xa/0x10 [ 616.039583] default_idle_call+0x36/0x90 [ 616.039586] do_idle+0x256/0x3b0 [ 616.039590] cpu_startup_entry+0x18/0x20 [ 616.039594] start_secondary+0x277/0x310 [ 616.039599] secondary_startup_64+0xa5/0xa5 [ 616.039604] Code: 93 08 00 00 41 c7 87 94 08 00 00 01 00 00 00 0f 1f 44 00 00 65 8b 05 a9 05 ac 7e 89 c0 48 0f a3 05 17 26 c9 04 0f 82 dc 07 00 00 <4d> 8d a5 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 c7 c7 00 [ 616.040414] Kernel panic - not syncing: hung_task: blocked tasks [ 616.040421] CPU: 0 PID: 644 Comm: khungtaskd Not tainted 4.13.0-rc6-next-20170825+ #9 [ 616.040425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.040427] Call Trace: [ 616.040436] dump_stack+0x194/0x257 [ 616.040446] ? arch_local_irq_restore+0x53/0x53 [ 616.040466] panic+0x1e4/0x41c [ 616.040473] ? refcount_error_report+0x214/0x214 [ 616.040495] watchdog+0x91d/0xd60 [ 616.040513] ? reset_hung_task_detector+0xa0/0xa0 [ 616.040519] ? complete+0x18/0x80 [ 616.040534] ? __schedule+0x2070/0x2070 [ 616.040548] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 616.040557] ? trace_hardirqs_on_caller+0x421/0x5c0