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-1,10.128.0.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 615.391130] INFO: task syzkaller654609:3051 blocked for more than 120 seconds. [ 615.398666] Not tainted 4.13.0-rc6-next-20170825+ #9 [ 615.404518] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 615.412518] syzkaller654609 D22392 3051 3049 0x00000000 [ 615.418259] Call Trace: [ 615.420890] __schedule+0x8e8/0x2070 [ 615.424634] ? __sched_text_start+0x8/0x8 [ 615.428796] ? prepare_to_wait_exclusive+0xb6/0x530 [ 615.433840] ? find_held_lock+0x39/0x1d0 [ 615.437927] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 615.442972] ? trace_hardirqs_on+0xd/0x10 [ 615.447155] schedule+0x108/0x440 [ 615.450641] ? __schedule+0x2070/0x2070 [ 615.454641] ? mark_held_locks+0xb2/0x100 [ 615.458829] ? __local_bh_enable_ip+0x9d/0x160 [ 615.463431] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.468483] ? __lock_sock+0x1d7/0x2f0 [ 615.472399] ? trace_hardirqs_on+0xd/0x10 [ 615.476571] ? __local_bh_enable_ip+0x9d/0x160 [ 615.481163] __lock_sock+0x1dc/0x2f0 [ 615.484901] ? proto_unregister+0x5e0/0x5e0 [ 615.489238] ? finish_wait+0x490/0x490 [ 615.493152] ? lock_sock_nested+0x44/0x110 [ 615.497421] lock_sock_nested+0xf3/0x110 [ 615.501530] tcp_sendmsg+0x21/0x50 [ 615.505125] inet_sendmsg+0x11f/0x5e0 [ 615.508953] ? inet_recvmsg+0x5f0/0x5f0 [ 615.512946] ? selinux_socket_sendmsg+0x36/0x40 [ 615.517644] ? security_socket_sendmsg+0x89/0xb0 [ 615.522415] ? inet_recvmsg+0x5f0/0x5f0 [ 615.526433] sock_sendmsg+0xca/0x110 [ 615.530166] kernel_sendmsg+0x47/0x60 [ 615.533993] sock_no_sendpage+0x1cc/0x280 [ 615.538158] ? sock_no_shutdown+0x10/0x10 [ 615.542353] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.547480] tcp_sendpage_locked+0x10b/0x160 [ 615.551913] tcp_sendpage+0x43/0x60 [ 615.555561] ? tcp_sendpage_locked+0x160/0x160 [ 615.560170] inet_sendpage+0x1aa/0x660 [ 615.564079] ? inet_sendmsg+0x5e0/0x5e0 [ 615.568080] ? inet_sendmsg+0x5e0/0x5e0 [ 615.572070] kernel_sendpage+0x8d/0xe0 [ 615.575972] sock_sendpage+0x92/0xc0 [ 615.579712] ? kernel_sendpage+0xe0/0xe0 [ 615.583794] pipe_to_sendpage+0x290/0x3b0 [ 615.587955] ? direct_splice_actor+0x180/0x180 [ 615.592562] ? check_same_owner+0x320/0x320 [ 615.596905] ? splice_from_pipe_next.part.9+0x22a/0x2e0 [ 615.602294] __splice_from_pipe+0x343/0x750 [ 615.606627] ? direct_splice_actor+0x180/0x180 [ 615.611234] splice_from_pipe+0x1e9/0x330 [ 615.615393] ? direct_splice_actor+0x180/0x180 [ 615.619990] ? splice_shrink_spd+0xb0/0xb0 [ 615.624252] ? security_file_permission+0x89/0x1f0 [ 615.629205] generic_splice_sendpage+0x40/0x50 [ 615.633796] ? splice_from_pipe+0x330/0x330 [ 615.638145] SyS_splice+0x7d5/0x1630 [ 615.641875] ? vmacache_find+0x61/0x270 [ 615.645879] ? compat_SyS_vmsplice+0x250/0x250 [ 615.650497] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.655540] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 615.660362] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 615.665133] RIP: 0033:0x43fd59 [ 615.668328] RSP: 002b:00007ffd15d1eb88 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 [ 615.676057] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd59 [ 615.683340] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000004 [ 615.690635] RBP: 0000000000000086 R08: 0000000800000004 R09: 0000000000000006 [ 615.697917] R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004016c0 [ 615.705204] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 615.712508] [ 615.712508] Showing all locks held in the system: [ 615.718851] 2 locks held by khungtaskd/642: [ 615.723192] #0: (rcu_read_lock){....}, at: [] watchdog+0x1c5/0xd60 [ 615.731302] #1: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0xd2/0x410 [ 615.740385] 1 lock held by rsyslogd/2939: [ 615.744548] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x131/0x1a0 [ 615.753007] 2 locks held by getty/3021: [ 615.757024] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.765737] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.775057] 2 locks held by getty/3022: [ 615.779053] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.787753] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.797073] 2 locks held by getty/3023: [ 615.801051] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.809759] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.819072] 2 locks held by getty/3024: [ 615.823070] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.831790] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.841110] 2 locks held by getty/3025: [ 615.845081] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.853796] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.863120] 2 locks held by getty/3026: [ 615.867116] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.875834] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.885160] 2 locks held by getty/3027: [ 615.889132] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 [ 615.897856] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 [ 615.907180] 2 locks held by syzkaller654609/3051: [ 615.912046] #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock+0x56/0x70 [ 615.920154] #1: (sk_lock-AF_INET){+.+.}, at: [] tcp_sendpage+0x2e/0x60 [ 615.928610] [ 615.930236] ============================================= [ 615.930236] [ 615.937270] NMI backtrace for cpu 1 [ 615.940910] CPU: 1 PID: 642 Comm: khungtaskd Not tainted 4.13.0-rc6-next-20170825+ #9 [ 615.948851] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 615.958178] Call Trace: [ 615.960790] dump_stack+0x194/0x257 [ 615.964396] ? arch_local_irq_restore+0x53/0x53 [ 615.969049] nmi_cpu_backtrace+0x20e/0x240 [ 615.973258] ? kobject_synth_uevent+0xad0/0xad0 [ 615.977899] ? debug_check_no_locks_held+0x140/0x140 [ 615.982975] ? show_regs_print_info+0x65/0x65 [ 615.987446] ? irq_force_complete_move+0x390/0x390 [ 615.992354] nmi_trigger_cpumask_backtrace+0x122/0x180 [ 615.997607] arch_trigger_cpumask_backtrace+0x14/0x20 [ 616.002769] watchdog+0x90c/0xd60 [ 616.006201] ? reset_hung_task_detector+0xa0/0xa0 [ 616.011013] ? complete+0x18/0x80 [ 616.014443] ? __schedule+0x2070/0x2070 [ 616.018396] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 616.023469] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.028475] ? trace_hardirqs_on+0xd/0x10 [ 616.032595] ? __kthread_parkme+0x173/0x240 [ 616.036899] kthread+0x39c/0x470 [ 616.040235] ? reset_hung_task_detector+0xa0/0xa0 [ 616.045046] ? kthread_create_on_node+0x100/0x100 [ 616.049862] ret_from_fork+0x2a/0x40 [ 616.053644] Sending NMI from CPU 1 to CPUs 0: [ 616.058158] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff84da2b86 [ 616.059156] Kernel panic - not syncing: hung_task: blocked tasks [ 616.059163] CPU: 1 PID: 642 Comm: khungtaskd Not tainted 4.13.0-rc6-next-20170825+ #9 [ 616.059167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.059169] Call Trace: [ 616.059178] dump_stack+0x194/0x257 [ 616.059188] ? arch_local_irq_restore+0x53/0x53 [ 616.059207] panic+0x1e4/0x41c [ 616.059214] ? refcount_error_report+0x214/0x214 [ 616.059238] watchdog+0x91d/0xd60 [ 616.059255] ? reset_hung_task_detector+0xa0/0xa0 [ 616.059261] ? complete+0x18/0x80 [ 616.059276] ? __schedule+0x2070/0x2070 [ 616.059290] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 616.059299] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.059306] ? trace_hardirqs_on+0xd/0x10 [ 616.059313] ? __kthread_parkme+0x173/0x240 [ 616.059324] kthread+0x39c/0x470 [ 616.059330] ? reset_hung_task_detector+0xa0/0xa0 [ 616.059334] ? kthread_create_on_node+0x100/0x100 [ 616.059343] ret_from_fork+0x2a/0x40 [ 616.158348] Dumping ftrace buffer: [ 616.161952] (ftrace buffer empty) [ 616.165639] Kernel Offset: disabled [ 616.169245] Rebooting in 86400 seconds..