[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.906615] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.355473] random: sshd: uninitialized urandom read (32 bytes read) [ 22.845475] random: sshd: uninitialized urandom read (32 bytes read) [ 23.571137] random: sshd: uninitialized urandom read (32 bytes read) [ 701.810934] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. [ 707.352069] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 861.152652] INFO: task syz-executor810:4676 blocked for more than 140 seconds. [ 861.160213] Not tainted 4.18.0-rc4-next-20180711+ #4 [ 861.165947] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 861.174052] syz-executor810 D23936 4676 4481 0x00000004 [ 861.179931] Call Trace: [ 861.182704] __schedule+0x87c/0x1ed0 [ 861.186523] ? __sched_text_start+0x8/0x8 [ 861.190818] ? set_next_entity+0x2eb/0xc70 [ 861.195177] ? dequeue_entity+0x400/0x15e0 [ 861.199475] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 861.204673] ? active_load_balance_cpu_stop+0x1030/0x1030 [ 861.210283] ? reweight_task+0x130/0x130 [ 861.214431] ? trace_hardirqs_on+0x10/0x10 [ 861.218754] ? __debug_object_init+0x581/0x12e0 [ 861.223533] schedule+0xfb/0x450 [ 861.227004] ? __schedule+0x1ed0/0x1ed0 [ 861.231107] ? do_raw_spin_unlock+0xa7/0x2f0 [ 861.235586] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 861.240249] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 861.244921] ? kasan_check_write+0x14/0x20 [ 861.249229] ? lock_acquire+0x1e4/0x540 [ 861.253359] ? wait_for_completion+0x428/0x8d0 [ 861.257999] schedule_timeout+0x1cc/0x260 [ 861.262213] ? usleep_range+0x1a0/0x1a0 [ 861.266290] ? do_raw_spin_unlock+0xa7/0x2f0 [ 861.270790] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 861.275473] ? kasan_check_write+0x14/0x20 [ 861.279809] ? do_raw_spin_lock+0xc1/0x200 [ 861.284155] wait_for_completion+0x430/0x8d0 [ 861.288822] ? wait_for_completion_interruptible+0x950/0x950 [ 861.294774] ? lock_downgrade+0x8f0/0x8f0 [ 861.299107] ? wake_up_q+0x100/0x100 [ 861.302944] ? kasan_check_read+0x11/0x20 [ 861.307180] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 861.311876] ? kasan_check_write+0x14/0x20 [ 861.316167] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 861.321877] flush_work+0x531/0x900 [ 861.325554] ? try_to_grab_pending+0x180/0x9c0 [ 861.330204] ? insert_work+0x4f0/0x4f0 [ 861.334311] ? lock_downgrade+0x8f0/0x8f0 [ 861.338578] ? kasan_check_read+0x11/0x20 [ 861.342970] ? do_raw_spin_unlock+0xa7/0x2f0 [ 861.347548] ? flush_workqueue_prep_pwqs+0x7f0/0x7f0 [ 861.352766] ? finish_wait+0x25d/0x430 [ 861.356718] ? queue_work_on+0x12c/0x1e0 [ 861.360841] __cancel_work_timer+0x4bd/0x830 [ 861.365352] ? mod_delayed_work_on+0x260/0x260 [ 861.369999] ? lock_acquire+0x1e4/0x540 [ 861.374044] ? remove_wait_queue+0x1a6/0x360 [ 861.378511] ? lock_downgrade+0x8f0/0x8f0 [ 861.382719] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 861.388444] ? kasan_check_read+0x11/0x20 [ 861.392662] ? lock_acquire+0x1e4/0x540 [ 861.396782] ? p9_fd_close+0x352/0x5b0 [ 861.400731] ? lock_downgrade+0x8f0/0x8f0 [ 861.404927] ? do_raw_spin_lock+0xc1/0x200 [ 861.409248] ? do_raw_spin_unlock+0xa7/0x2f0 [ 861.414014] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 861.418681] ? kasan_check_write+0x14/0x20 [ 861.423023] ? do_raw_spin_lock+0xc1/0x200 [ 861.427358] cancel_work_sync+0x17/0x20 [ 861.431425] p9_fd_close+0x36a/0x5b0 [ 861.435223] ? p9_poll_workfn+0x6d0/0x6d0 [ 861.439438] ? p9_fd_show_options+0x1c0/0x1c0 [ 861.444076] ? __raw_spin_lock_init+0x2d/0x100 [ 861.448725] p9_client_create+0xa9a/0x1770 [ 861.453049] ? p9_client_read+0xc60/0xc60 [ 861.457267] ? kasan_check_read+0x11/0x20 [ 861.461598] ? lock_acquire+0x1e4/0x540 [ 861.465651] ? fs_reclaim_acquire+0x20/0x20 [ 861.470039] ? lock_release+0xa30/0xa30 [ 861.474092] ? __lockdep_init_map+0x105/0x590 [ 861.478652] ? kasan_check_write+0x14/0x20 [ 861.482949] ? __init_rwsem+0x1cc/0x2a0 [ 861.486995] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 861.492082] ? __kmalloc_track_caller+0x311/0x760 [ 861.496987] ? save_stack+0xa9/0xd0 [ 861.500664] ? save_stack+0x43/0xd0 [ 861.504354] ? kasan_kmalloc+0xc4/0xe0 [ 861.508353] ? kmem_cache_alloc_trace+0x152/0x780 [ 861.513232] ? memcpy+0x45/0x50 [ 861.516599] v9fs_session_init+0x21a/0x1a80 [ 861.521091] ? rcu_note_context_switch+0x730/0x730 [ 861.526201] ? do_mount+0x69e/0x1fb0 [ 861.530010] ? lock_acquire+0x1e4/0x540 [ 861.534100] ? v9fs_show_options+0x7e0/0x7e0 [ 861.538597] ? lock_release+0xa30/0xa30 [ 861.542641] ? check_same_owner+0x340/0x340 [ 861.547026] ? kasan_unpoison_shadow+0x35/0x50 [ 861.551671] ? kasan_kmalloc+0xc4/0xe0 [ 861.555621] ? kmem_cache_alloc_trace+0x318/0x780 [ 861.560561] ? kasan_unpoison_shadow+0x35/0x50 [ 861.565245] ? kasan_kmalloc+0xc4/0xe0 [ 861.569239] v9fs_mount+0x7c/0x900 [ 861.572921] ? v9fs_drop_inode+0x150/0x150 [ 861.577294] legacy_get_tree+0x118/0x440 [ 861.581453] vfs_get_tree+0x1cb/0x5c0 [ 861.585342] do_mount+0x6c1/0x1fb0 [ 861.588962] ? kasan_check_write+0x14/0x20 [ 861.593283] ? copy_mount_string+0x40/0x40 [ 861.597645] ? retint_kernel+0x10/0x10 [ 861.601630] ? copy_mount_options+0x1e3/0x380 [ 861.606369] ? write_comp_data+0x70/0x70 [ 861.610523] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 861.616183] ? copy_mount_options+0x285/0x380 [ 861.620724] ksys_mount+0x12d/0x140 [ 861.624402] __x64_sys_mount+0xbe/0x150 [ 861.628454] do_syscall_64+0x1b9/0x820 [ 861.632421] ? syscall_return_slowpath+0x5e0/0x5e0 [ 861.637413] ? syscall_return_slowpath+0x31d/0x5e0 [ 861.642408] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 861.647505] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 861.652440] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 861.657684] RIP: 0033:0x445e89 [ 861.660926] Code: Bad RIP value. [ 861.664401] RSP: 002b:00007fd68625eda8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 861.672187] RAX: ffffffffffffffda RBX: 00000000006dbc3c RCX: 0000000000445e89 [ 861.679547] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 861.686885] RBP: 0000000000000000 R08: 00000000200001c0 R09: 0000000000000000 [ 861.694234] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000006dbc38 [ 861.701558] R13: 0030656c69662f2e R14: 64663d736e617274 R15: 0000000000000005 [ 861.708895] INFO: lockdep is turned off. [ 861.713030] NMI backtrace for cpu 1 [ 861.716714] CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc4-next-20180711+ #4 [ 861.724675] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 861.734070] Call Trace: [ 861.736664] dump_stack+0x1c9/0x2b4 [ 861.740280] ? dump_stack_print_info.cold.2+0x52/0x52 [ 861.745471] ? vprintk_default+0x28/0x30 [ 861.749547] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 861.754741] nmi_cpu_backtrace.cold.3+0x48/0x88 [ 861.759419] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 861.764627] nmi_trigger_cpumask_backtrace+0x151/0x192 [ 861.769933] arch_trigger_cpumask_backtrace+0x14/0x20 [ 861.775170] watchdog+0xb81/0x10f0 [ 861.778721] ? reset_hung_task_detector+0xd0/0xd0 [ 861.783597] ? find_held_lock+0x36/0x1c0 [ 861.787672] ? kasan_check_read+0x11/0x20 [ 861.791839] ? do_raw_spin_unlock+0xa7/0x2f0 [ 861.796294] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 861.801412] ? __kthread_parkme+0x58/0x1b0 [ 861.805695] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 861.810713] ? trace_hardirqs_on+0xd/0x10 [ 861.814858] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 861.820399] ? __kthread_parkme+0x106/0x1b0 [ 861.824733] kthread+0x345/0x410 [ 861.828104] ? reset_hung_task_detector+0xd0/0xd0 [ 861.832952] ? kthread_bind+0x40/0x40 [ 861.836764] ret_from_fork+0x3a/0x50 [ 861.840588] Sending NMI from CPU 1 to CPUs 0: [ 861.845303] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 [ 861.846183] Kernel panic - not syncing: hung_task: blocked tasks [ 861.859102] CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc4-next-20180711+ #4 [ 861.867080] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 861.876434] Call Trace: [ 861.879033] dump_stack+0x1c9/0x2b4 [ 861.882651] ? dump_stack_print_info.cold.2+0x52/0x52 [ 861.887854] ? printk_safe_log_store+0x2f0/0x2f0 [ 861.892707] panic+0x238/0x4e7 [ 861.895901] ? add_taint.cold.5+0x16/0x16 [ 861.900051] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 861.905615] ? nmi_trigger_cpumask_backtrace+0x13a/0x192 [ 861.911103] ? printk_safe_flush+0xd7/0x130 [ 861.915448] watchdog+0xb92/0x10f0 [ 861.918996] ? reset_hung_task_detector+0xd0/0xd0 [ 861.923868] ? find_held_lock+0x36/0x1c0 [ 861.927972] ? kasan_check_read+0x11/0x20 [ 861.932144] ? do_raw_spin_unlock+0xa7/0x2f0 [ 861.936579] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 861.941702] ? __kthread_parkme+0x58/0x1b0 [ 861.945947] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 861.950981] ? trace_hardirqs_on+0xd/0x10 [ 861.955167] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 861.960892] ? __kthread_parkme+0x106/0x1b0 [ 861.965234] kthread+0x345/0x410 [ 861.968752] ? reset_hung_task_detector+0xd0/0xd0 [ 861.973694] ? kthread_bind+0x40/0x40 [ 861.977615] ret_from_fork+0x3a/0x50 [ 861.982009] Dumping ftrace buffer: [ 861.985566] (ftrace buffer empty) [ 861.989394] Kernel Offset: disabled [ 861.993054] Rebooting in 86400 seconds..