[?25l[?1c7[ ok 8[?25h[?0c. [ 31.594552] random: sshd: uninitialized urandom read (32 bytes read) [ 31.798325] kauditd_printk_skb: 10 callbacks suppressed [ 31.798333] audit: type=1400 audit(1567920763.906:35): avc: denied { map } for pid=6923 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 [ 31.843287] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.387188] random: sshd: uninitialized urandom read (32 bytes read) [ 617.001895] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.127' (ECDSA) to the list of known hosts. [ 622.542142] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 622.668563] audit: type=1400 audit(1567921354.776:36): avc: denied { map } for pid=6937 comm="syz-executor259" path="/root/syz-executor259614837" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 858.070282] INFO: task syz-executor259:6937 blocked for more than 140 seconds. [ 858.077789] Not tainted 4.14.142 #0 [ 858.082805] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.090996] syz-executor259 D28144 6937 6935 0x80000002 [ 858.096650] Call Trace: [ 858.099307] __schedule+0x7b8/0x1cd0 [ 858.103072] ? pci_mmcfg_check_reserved+0x150/0x150 [ 858.108147] ? trace_hardirqs_on+0x10/0x10 [ 858.112613] schedule+0x92/0x1c0 [ 858.115982] schedule_timeout+0x93b/0xe10 [ 858.120240] ? wait_for_completion+0x274/0x420 [ 858.124822] ? find_held_lock+0x35/0x130 [ 858.128863] ? usleep_range+0x130/0x130 [ 858.132922] ? _raw_spin_unlock_irq+0x28/0x90 [ 858.137410] ? trace_hardirqs_on_caller+0x400/0x590 [ 858.142464] wait_for_completion+0x27c/0x420 [ 858.146866] ? wait_for_completion_interruptible+0x490/0x490 [ 858.152708] ? wake_up_q+0xf0/0xf0 [ 858.156307] ucma_close+0xf0/0x310 [ 858.159828] ? ucma_free_ctx+0xa30/0xa30 [ 858.163934] __fput+0x275/0x7a0 [ 858.167209] ____fput+0x16/0x20 [ 858.170532] task_work_run+0x114/0x190 [ 858.174592] do_exit+0x7df/0x2c10 [ 858.178134] ? rw_verify_area+0xea/0x2b0 [ 858.182286] ? mm_update_next_owner+0x5d0/0x5d0 [ 858.188524] ? vfs_write+0x104/0x500 [ 858.192310] ? SyS_write+0x15e/0x230 [ 858.196024] do_group_exit+0x111/0x330 [ 858.199899] SyS_exit_group+0x1d/0x20 [ 858.203825] ? do_group_exit+0x330/0x330 [ 858.207890] do_syscall_64+0x1e8/0x640 [ 858.212317] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 858.217251] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 858.222504] RIP: 0033:0x43eee8 [ 858.225690] RSP: 002b:00007ffd4b691e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 858.233478] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eee8 [ 858.240791] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 858.248046] RBP: 00000000004be6e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 858.255398] R10: 0000000000401ba0 R11: 0000000000000246 R12: 0000000000000001 [ 858.262831] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 858.270195] [ 858.270195] Showing all locks held in the system: [ 858.276519] 1 lock held by khungtaskd/1012: [ 858.280943] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f [ 858.290087] 2 locks held by getty/6913: [ 858.294060] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.302884] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.312234] 2 locks held by getty/6914: [ 858.316459] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.325193] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.334725] 2 locks held by getty/6915: [ 858.338693] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.347426] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.356830] 2 locks held by getty/6916: [ 858.360961] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.369636] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.379778] 2 locks held by getty/6917: [ 858.383792] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.392572] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.401909] 2 locks held by getty/6918: [ 858.405867] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.414597] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.423981] 2 locks held by getty/6919: [ 858.427953] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 858.436709] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 858.446057] [ 858.447689] ============================================= [ 858.447689] [ 858.455118] NMI backtrace for cpu 0 [ 858.458857] CPU: 0 PID: 1012 Comm: khungtaskd Not tainted 4.14.142 #0 [ 858.465517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.474976] Call Trace: [ 858.477622] dump_stack+0x138/0x197 [ 858.481253] nmi_cpu_backtrace.cold+0x57/0x94 [ 858.485748] ? irq_force_complete_move.cold+0x7d/0x7d [ 858.490932] nmi_trigger_cpumask_backtrace+0x141/0x189 [ 858.496192] arch_trigger_cpumask_backtrace+0x14/0x20 [ 858.501376] watchdog+0x5e7/0xb90 [ 858.504901] kthread+0x319/0x430 [ 858.508249] ? hungtask_pm_notify+0x50/0x50 [ 858.512564] ? kthread_create_on_node+0xd0/0xd0 [ 858.517214] ret_from_fork+0x24/0x30 [ 858.521100] Sending NMI from CPU 0 to CPUs 1: [ 858.525651] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff861c1c6e [ 858.526619] Kernel panic - not syncing: hung_task: blocked tasks [ 858.538976] CPU: 0 PID: 1012 Comm: khungtaskd Not tainted 4.14.142 #0 [ 858.545553] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.554906] Call Trace: [ 858.557493] dump_stack+0x138/0x197 [ 858.561107] panic+0x1f2/0x426 [ 858.564283] ? add_taint.cold+0x16/0x16 [ 858.568338] ? ___preempt_schedule+0x16/0x18 [ 858.572750] watchdog+0x5f8/0xb90 [ 858.576193] kthread+0x319/0x430 [ 858.579549] ? hungtask_pm_notify+0x50/0x50 [ 858.584201] ? kthread_create_on_node+0xd0/0xd0 [ 858.588884] ret_from_fork+0x24/0x30 [ 858.594405] Kernel Offset: disabled [ 858.598055] Rebooting in 86400 seconds..