[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.423365] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.312958] random: sshd: uninitialized urandom read (32 bytes read) [ 25.575942] random: sshd: uninitialized urandom read (32 bytes read) [ 26.094459] random: sshd: uninitialized urandom read (32 bytes read) [ 61.534234] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 67.124673] 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 [ 67.826311] WARNING: CPU: 1 PID: 1691 at sound/core/rawmidi.c:1170 __snd_rawmidi_transmit_ack+0x263/0x2f0 [ 67.836156] Kernel panic - not syncing: panic_on_warn set ... [ 67.836156] [ 67.843527] CPU: 1 PID: 1691 Comm: kworker/1:1H Not tainted 4.18.0-next-20180814+ #38 [ 67.851488] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.860851] Workqueue: events_highpri snd_vmidi_output_work [ 67.866564] Call Trace: [ 67.869154] dump_stack+0x1c9/0x2b4 [ 67.872790] ? dump_stack_print_info.cold.2+0x52/0x52 [ 67.878013] panic+0x238/0x4e7 [ 67.881214] ? add_taint.cold.5+0x16/0x16 [ 67.885375] ? __warn.cold.8+0x148/0x1ba [ 67.889530] ? __warn.cold.8+0x117/0x1ba [ 67.893596] ? __snd_rawmidi_transmit_ack+0x263/0x2f0 [ 67.898799] __warn.cold.8+0x163/0x1ba [ 67.902693] ? __snd_rawmidi_transmit_ack+0x263/0x2f0 [ 67.907890] report_bug+0x252/0x2d0 [ 67.911521] do_error_trap+0x1fc/0x4d0 [ 67.915409] ? print_usage_bug+0xc0/0xc0 [ 67.919471] ? kasan_check_read+0x11/0x20 [ 67.923621] ? math_error+0x3e0/0x3e0 [ 67.927423] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 67.932448] ? find_held_lock+0x36/0x1c0 [ 67.936525] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.941377] do_invalid_op+0x1b/0x20 [ 67.945092] invalid_op+0x14/0x20 [ 67.948551] RIP: 0010:__snd_rawmidi_transmit_ack+0x263/0x2f0 [ 67.954359] Code: ba 01 00 00 00 be 03 00 00 00 e8 18 3a 66 fc e8 e3 44 86 fc 89 d8 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 cd 44 86 fc <0f> 0b e9 72 fe ff ff e8 21 5a c5 fc e9 1b ff ff ff bb ea ff ff ff [ 67.973264] RSP: 0018:ffff8801d2a6f5a8 EFLAGS: 00010093 [ 67.978628] RAX: ffff8801d2a52300 RBX: 0000000000000001 RCX: ffffffff84f64792 [ 67.992006] RDX: 0000000000000000 RSI: ffffffff84f64923 RDI: 0000000000000006 [ 67.999281] RBP: ffff8801d2a6f5e8 R08: ffff8801d2a52300 R09: ffffed003607acc1 [ 68.006558] R10: ffffed003607acc1 R11: ffff8801b03d660b R12: ffff8801ce2479c0 [ 68.013825] R13: 0000000000001001 R14: 0000000000000001 R15: ffff8801b03d65c0 [ 68.021112] ? __snd_rawmidi_transmit_ack+0xd2/0x2f0 [ 68.026217] ? __snd_rawmidi_transmit_ack+0x263/0x2f0 [ 68.031418] ? __snd_rawmidi_transmit_ack+0x263/0x2f0 [ 68.036620] snd_rawmidi_transmit_ack+0x51/0x80 [ 68.041296] snd_vmidi_output_work+0x3f4/0x4e0 [ 68.045887] ? snd_virmidi_free+0x50/0x50 [ 68.050039] ? __lock_is_held+0xb5/0x140 [ 68.054126] process_one_work+0xc73/0x1aa0 [ 68.058381] ? mark_held_locks+0x160/0x160 [ 68.062634] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 68.067306] ? __switch_to_asm+0x34/0x70 [ 68.071365] ? __switch_to_asm+0x40/0x70 [ 68.075425] ? __switch_to_asm+0x34/0x70 [ 68.079490] ? __switch_to_asm+0x40/0x70 [ 68.083550] ? __switch_to_asm+0x34/0x70 [ 68.087616] ? __switch_to_asm+0x40/0x70 [ 68.091698] ? __switch_to_asm+0x34/0x70 [ 68.095765] ? __switch_to_asm+0x40/0x70 [ 68.099827] ? __switch_to_asm+0x34/0x70 [ 68.103904] ? __sched_text_start+0x8/0x8 [ 68.108062] ? lock_downgrade+0x8f0/0x8f0 [ 68.112213] ? graph_lock+0x170/0x170 [ 68.116016] ? graph_lock+0x170/0x170 [ 68.119826] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 68.124586] ? lockdep_hardirqs_on+0x421/0x5c0 [ 68.129171] ? retint_kernel+0x10/0x10 [ 68.133075] ? lock_acquire+0x1e4/0x4f0 [ 68.137056] ? worker_thread+0x3dc/0x13c0 [ 68.141213] ? lock_release+0x9f0/0x9f0 [ 68.145197] ? trace_hardirqs_off+0xb8/0x2b0 [ 68.149608] ? kasan_check_read+0x11/0x20 [ 68.153760] ? worker_thread+0x3dc/0x13c0 [ 68.157915] ? trace_hardirqs_on+0x2c0/0x2c0 [ 68.162338] ? kasan_check_write+0x14/0x20 [ 68.166576] ? do_raw_spin_lock+0xc1/0x200 [ 68.170819] worker_thread+0x189/0x13c0 [ 68.174792] ? __switch_to_asm+0x34/0x70 [ 68.178858] ? __switch_to_asm+0x34/0x70 [ 68.182919] ? __switch_to_asm+0x40/0x70 [ 68.187014] ? process_one_work+0x1aa0/0x1aa0 [ 68.191516] ? graph_lock+0x170/0x170 [ 68.195326] ? graph_lock+0x170/0x170 [ 68.199129] ? find_held_lock+0x36/0x1c0 [ 68.203294] ? find_held_lock+0x36/0x1c0 [ 68.207370] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 68.212477] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 68.217587] ? lockdep_hardirqs_on+0x421/0x5c0 [ 68.222173] ? trace_hardirqs_on+0xbd/0x2c0 [ 68.226493] ? kasan_check_read+0x11/0x20 [ 68.230641] ? __kthread_parkme+0xd7/0x1b0 [ 68.234885] ? kasan_check_write+0x14/0x20 [ 68.239126] ? __kthread_parkme+0x58/0x1b0 [ 68.243371] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.248910] ? __kthread_parkme+0x106/0x1b0 [ 68.253251] kthread+0x35a/0x420 [ 68.256619] ? process_one_work+0x1aa0/0x1aa0 [ 68.261112] ? kthread_bind+0x40/0x40 [ 68.264918] ret_from_fork+0x3a/0x50 [ 69.327917] Shutting down cpus with NMI [ 69.332160] Dumping ftrace buffer: [ 69.335830] (ftrace buffer empty) [ 69.339525] Kernel Offset: disabled [ 69.343137] Rebooting in 86400 seconds..