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 '10.128.0.59' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 554.890208] INFO: task syz-executor501:5586 blocked for more than 140 seconds. [ 554.897876] Not tainted 4.19.0-rc4-next-20180921+ #77 [ 554.903858] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 554.911960] syz-executor501 D25064 5586 5568 0x00000004 [ 554.917590] Call Trace: [ 554.920444] __schedule+0x86c/0x1ed0 [ 554.924161] ? __switch_to_asm+0x34/0x70 [ 554.928222] ? __switch_to_asm+0x34/0x70 [ 554.932428] ? __sched_text_start+0x8/0x8 [ 554.936573] ? _raw_spin_unlock+0x2c/0x50 [ 554.940795] ? __sched_text_start+0x8/0x8 [ 554.945098] ? wq_calc_node_cpumask+0x390/0x390 [ 554.949795] ? is_bpf_text_address+0xd3/0x170 [ 554.954373] ? graph_lock+0x170/0x170 [ 554.958173] schedule+0xfe/0x460 [ 554.961634] ? __local_bh_enable_ip+0x160/0x260 [ 554.966372] ? __schedule+0x1ed0/0x1ed0 [ 554.970434] ? find_held_lock+0x36/0x1c0 [ 554.974501] ? mark_held_locks+0xc7/0x130 [ 554.978658] schedule_timeout+0x1cc/0x260 [ 554.982957] ? usleep_range+0x1a0/0x1a0 [ 554.986937] ? wait_for_completion+0x41f/0x8a0 [ 554.991721] ? trace_hardirqs_off_caller+0x300/0x300 [ 554.996906] ? kasan_check_write+0x14/0x20 [ 555.001231] ? do_raw_spin_lock+0xc1/0x200 [ 555.005477] wait_for_completion+0x427/0x8a0 [ 555.009941] ? wait_for_completion_interruptible+0x840/0x840 [ 555.015793] ? wake_up_q+0x100/0x100 [ 555.019608] ? pcrypt_aead_enc+0x190/0x190 [ 555.024063] ? rcu_read_lock_sched_held+0x108/0x120 [ 555.029239] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 555.034843] ? pcrypt_aead_encrypt+0x370/0x460 [ 555.039469] tls_push_record+0xf96/0x1480 [ 555.043708] ? check_preemption_disabled+0x48/0x200 [ 555.048750] tls_sw_sendmsg+0xbfd/0x1310 [ 555.052865] ? ttwu_stat+0x5c0/0x5c0 [ 555.056582] ? decrypt_skb_update+0xa30/0xa30 [ 555.061161] ? aa_sk_perm+0x22b/0x8e0 [ 555.065114] ? aa_af_perm+0x5a0/0x5a0 [ 555.068960] ? usercopy_warn+0x110/0x110 [ 555.073130] inet_sendmsg+0x19c/0x690 [ 555.076936] ? ipip_gro_receive+0x100/0x100 [ 555.081344] ? apparmor_socket_sendmsg+0x29/0x30 [ 555.086106] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 555.091745] ? security_socket_sendmsg+0x94/0xc0 [ 555.096608] ? ipip_gro_receive+0x100/0x100 [ 555.101278] sock_sendmsg+0xd5/0x120 [ 555.104998] __sys_sendto+0x3d7/0x670 [ 555.108789] ? __ia32_sys_getpeername+0xb0/0xb0 [ 555.113503] ? _raw_spin_unlock_bh+0x30/0x40 [ 555.117906] ? release_sock+0x1ec/0x2c0 [ 555.121917] ? tls_sw_free_resources_rx+0x80/0x80 [ 555.126802] ? __release_sock+0x3a0/0x3a0 [ 555.131011] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 555.136586] ? _copy_from_user+0xdf/0x150 [ 555.140805] ? sk_stream_wait_memory+0x1290/0x1290 [ 555.145728] ? tls_setsockopt+0xb2/0x770 [ 555.149802] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 555.155529] ? do_syscall_64+0x9a/0x820 [ 555.159506] ? do_syscall_64+0x9a/0x820 [ 555.163521] ? lockdep_hardirqs_on+0x421/0x5c0 [ 555.168097] ? trace_hardirqs_on+0xbd/0x310 [ 555.172477] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 555.177927] ? trace_hardirqs_off_caller+0x300/0x300 [ 555.183107] __x64_sys_sendto+0xe1/0x1a0 [ 555.187166] do_syscall_64+0x1b9/0x820 [ 555.191128] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 555.196626] ? syscall_return_slowpath+0x5e0/0x5e0 [ 555.201630] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 555.206587] ? trace_hardirqs_off+0x310/0x310 [ 555.211193] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 555.216209] ? prepare_exit_to_usermode+0x291/0x3b0 [ 555.221303] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 555.226152] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 555.231551] RIP: 0033:0x440fd9 [ 555.234748] Code: e8 cc ab 02 00 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 555.253926] RSP: 002b:00007ffdef886098 EFLAGS: 00000212 ORIG_RAX: 000000000000002c [ 555.261660] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440fd9 [ 555.268941] RDX: 00000000000000b4 RSI: 0000000020000200 RDI: 0000000000000003 [ 555.276277] RBP: 0000000000000000 R08: 0000000020000040 R09: 000000000000001c [ 555.283605] R10: 0000000000000000 R11: 0000000000000212 R12: 000000000006126d [ 555.290912] R13: 0000000000401fb0 R14: 0000000000000000 R15: 0000000000000000 [ 555.298202] [ 555.298202] Showing all locks held in the system: [ 555.304592] 1 lock held by khungtaskd/983: [ 555.308817] #0: 0000000002023f59 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 [ 555.317504] 1 lock held by rsyslogd/5448: [ 555.321669] #0: 000000001b54978e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 [ 555.329722] 2 locks held by getty/5539: [ 555.333742] #0: 00000000fc3dc491 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.342140] #1: 00000000760b9c74 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.351244] 2 locks held by getty/5540: [ 555.355222] #0: 000000003c2efcfc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.363539] #1: 00000000f14c369d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.372439] 2 locks held by getty/5541: [ 555.376424] #0: 00000000d996651b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.384843] #1: 0000000044246b44 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.393782] 2 locks held by getty/5542: [ 555.397749] #0: 0000000026d82c35 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.406082] #1: 00000000a5627aaa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.415104] 2 locks held by getty/5543: [ 555.419064] #0: 000000002aa82f96 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.427383] #1: 00000000d7c2f86b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.436280] 2 locks held by getty/5544: [ 555.440396] #0: 000000007a09cf21 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.448652] #1: 0000000065845d6b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.462713] 2 locks held by getty/5545: [ 555.466679] #0: 00000000030dff8b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 555.475186] #1: 00000000eba6db68 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 555.484145] 1 lock held by syz-executor501/5586: [ 555.488885] #0: 00000000db7b5e4f (sk_lock-AF_INET6){+.+.}, at: tls_sw_sendmsg+0x226/0x1310 [ 555.497594] [ 555.499226] ============================================= [ 555.499226] [ 555.506315] NMI backtrace for cpu 1 [ 555.509998] CPU: 1 PID: 983 Comm: khungtaskd Not tainted 4.19.0-rc4-next-20180921+ #77 [ 555.518037] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 555.527375] Call Trace: [ 555.530018] dump_stack+0x1d3/0x2c4 [ 555.533637] ? dump_stack_print_info.cold.2+0x52/0x52 [ 555.538827] ? check_preemption_disabled+0x48/0x200 [ 555.543899] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 555.549595] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 555.554869] nmi_cpu_backtrace.cold.4+0x63/0xa2 [ 555.559555] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 555.564739] nmi_trigger_cpumask_backtrace+0x1c2/0x22c [ 555.570080] arch_trigger_cpumask_backtrace+0x14/0x20 [ 555.575280] watchdog+0xb39/0x1050 [ 555.578814] ? reset_hung_task_detector+0xd0/0xd0 [ 555.583649] ? __kthread_parkme+0xce/0x1a0 [ 555.587885] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 555.592969] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 555.598159] ? lockdep_hardirqs_on+0x421/0x5c0 [ 555.602730] ? trace_hardirqs_on+0xbd/0x310 [ 555.607203] ? kasan_check_read+0x11/0x20 [ 555.611344] ? __kthread_parkme+0xce/0x1a0 [ 555.615567] ? trace_hardirqs_off_caller+0x300/0x300 [ 555.620654] ? kasan_check_write+0x14/0x20 [ 555.624882] ? do_raw_spin_lock+0xc1/0x200 [ 555.629124] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 555.634243] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 555.640091] ? __kthread_parkme+0xfb/0x1a0 [ 555.644332] ? reset_hung_task_detector+0xd0/0xd0 [ 555.649161] kthread+0x35a/0x440 [ 555.652518] ? kthread_bind+0x40/0x40 [ 555.656306] ret_from_fork+0x3a/0x50 [ 555.660131] Sending NMI from CPU 1 to CPUs 0: [ 555.664713] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 [ 555.665933] Kernel panic - not syncing: hung_task: blocked tasks [ 555.678445] CPU: 1 PID: 983 Comm: khungtaskd Not tainted 4.19.0-rc4-next-20180921+ #77 [ 555.686482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 555.695820] Call Trace: [ 555.698394] dump_stack+0x1d3/0x2c4 [ 555.702013] ? dump_stack_print_info.cold.2+0x52/0x52 [ 555.707251] panic+0x238/0x4e7 [ 555.710443] ? add_taint.cold.5+0x16/0x16 [ 555.714581] ? nmi_trigger_cpumask_backtrace+0x1a2/0x22c [ 555.720024] ? nmi_trigger_cpumask_backtrace+0x1fe/0x22c [ 555.725460] ? nmi_trigger_cpumask_backtrace+0x1ab/0x22c [ 555.730897] ? nmi_trigger_cpumask_backtrace+0x1a2/0x22c [ 555.736335] watchdog+0xb4a/0x1050 [ 555.739873] ? reset_hung_task_detector+0xd0/0xd0 [ 555.744722] ? __kthread_parkme+0xce/0x1a0 [ 555.749032] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 555.754204] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 555.759417] ? lockdep_hardirqs_on+0x421/0x5c0 [ 555.763994] ? trace_hardirqs_on+0xbd/0x310 [ 555.768310] ? kasan_check_read+0x11/0x20 [ 555.772489] ? __kthread_parkme+0xce/0x1a0 [ 555.776817] ? trace_hardirqs_off_caller+0x300/0x300 [ 555.781973] ? kasan_check_write+0x14/0x20 [ 555.786198] ? do_raw_spin_lock+0xc1/0x200 [ 555.790423] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 555.795515] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 555.801040] ? __kthread_parkme+0xfb/0x1a0 [ 555.805258] ? reset_hung_task_detector+0xd0/0xd0 [ 555.810106] kthread+0x35a/0x440 [ 555.813457] ? kthread_bind+0x40/0x40 [ 555.817252] ret_from_fork+0x3a/0x50 [ 555.822166] Kernel Offset: disabled [ 555.825800] Rebooting in 86400 seconds..