[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.109704] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.661150] random: sshd: uninitialized urandom read (32 bytes read)
[   23.951330] random: sshd: uninitialized urandom read (32 bytes read)
[   24.713230] random: sshd: uninitialized urandom read (32 bytes read)
[   41.167124] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts.
[   46.669275] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   46.759249] WARNING: CPU: 1 PID: 4514 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   46.767629] Kernel panic - not syncing: panic_on_warn set ...
[   46.767629] 
[   46.774977] CPU: 1 PID: 4514 Comm: syz-executor212 Not tainted 4.17.0-rc3+ #33
[   46.782317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   46.791673] Call Trace:
[   46.794246]  dump_stack+0x1b9/0x294
[   46.797870]  ? dump_stack_print_info.cold.2+0x52/0x52
[   46.803059]  ? smc_unhash_sk+0x270/0x4a0
[   46.807107]  panic+0x22f/0x4de
[   46.810300]  ? add_taint.cold.5+0x16/0x16
[   46.814436]  ? __warn.cold.8+0x148/0x1b3
[   46.818494]  ? __warn.cold.8+0x117/0x1b3
[   46.822548]  ? smc_unhash_sk+0x345/0x4a0
[   46.826595]  __warn.cold.8+0x163/0x1b3
[   46.830561]  ? smc_unhash_sk+0x345/0x4a0
[   46.834612]  report_bug+0x252/0x2d0
[   46.838226]  do_error_trap+0x1de/0x490
[   46.842106]  ? graph_lock+0x170/0x170
[   46.845892]  ? math_error+0x420/0x420
[   46.849682]  ? lock_acquire+0x1dc/0x520
[   46.853640]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   46.858465]  do_invalid_op+0x1b/0x20
[   46.862161]  invalid_op+0x14/0x20
[   46.865611] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   46.870264] RSP: 0018:ffff8801acfc7488 EFLAGS: 00010293
[   46.875608] RAX: ffff8801aca0e440 RBX: ffff8801acd0e7c0 RCX: ffffffff873fe71e
[   46.882864] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005
[   46.890134] RBP: ffff8801acfc7570 R08: ffff8801aca0e440 R09: ffffed00359a1d08
[   46.897390] R10: ffffed00359a1d08 R11: ffff8801acd0e843 R12: 1ffff100359f8e95
[   46.904644] R13: ffff8801acfc7548 R14: ffffffff8970e4e0 R15: ffff8801acd0e840
[   46.911912]  ? smc_unhash_sk+0x28e/0x4a0
[   46.915960]  ? smc_unhash_sk+0x345/0x4a0
[   46.920002]  ? smc_unhash_sk+0x345/0x4a0
[   46.924042]  ? smc_rx_data_available+0x100/0x100
[   46.928779]  ? release_sock+0x1e2/0x2b0
[   46.932735]  ? __local_bh_enable_ip+0x161/0x230
[   46.937383]  ? __release_sock+0x3a0/0x3a0
[   46.941510]  ? smc_release+0x269/0x610
[   46.945381]  ? trace_hardirqs_on+0xd/0x10
[   46.949536]  ? __local_bh_enable_ip+0x161/0x230
[   46.954278]  smc_release+0x36e/0x610
[   46.957977]  sock_release+0x96/0x1b0
[   46.961673]  ? sock_alloc_file+0x4e0/0x4e0
[   46.965886]  sock_close+0x16/0x20
[   46.969321]  __fput+0x34d/0x890
[   46.972587]  ? fput+0x1a0/0x1a0
[   46.975851]  ? _raw_spin_unlock_irq+0x27/0x70
[   46.980329]  ____fput+0x15/0x20
[   46.983588]  task_work_run+0x1e4/0x290
[   46.987455]  ? task_work_cancel+0x240/0x240
[   46.991765]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   46.997296]  ? switch_task_namespaces+0xa2/0xd0
[   47.001952]  do_exit+0x1aee/0x2730
[   47.005477]  ? mm_update_next_owner+0x980/0x980
[   47.010125]  ? lock_downgrade+0x8e0/0x8e0
[   47.014269]  ? noop_count+0x40/0x40
[   47.017874]  ? lock_pin_lock+0x350/0x350
[   47.021915]  ? kasan_check_read+0x11/0x20
[   47.026044]  ? rcu_is_watching+0x85/0x140
[   47.030174]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   47.035348]  ? is_bpf_text_address+0xd7/0x170
[   47.039825]  ? check_usage_backwards+0x151/0x3a0
[   47.044564]  ? graph_lock+0x170/0x170
[   47.048349]  ? graph_lock+0x170/0x170
[   47.052133]  ? find_held_lock+0x36/0x1c0
[   47.056179]  ? lock_downgrade+0x8e0/0x8e0
[   47.060305]  ? kasan_check_read+0x11/0x20
[   47.064430]  ? do_raw_spin_unlock+0x9e/0x2e0
[   47.068826]  ? __local_bh_enable_ip+0x161/0x230
[   47.073473]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   47.078467]  ? release_sock+0x1e2/0x2b0
[   47.082415]  ? trace_hardirqs_on+0xd/0x10
[   47.086541]  ? __local_bh_enable_ip+0x161/0x230
[   47.091190]  ? _raw_spin_unlock_bh+0x30/0x40
[   47.095587]  ? release_sock+0x1e2/0x2b0
[   47.099542]  ? __release_sock+0x3a0/0x3a0
[   47.103672]  ? __local_bh_enable_ip+0x161/0x230
[   47.108324]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   47.113496]  ? smc_setsockopt+0x1ed/0x630
[   47.117625]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   47.123156]  ? __sys_setsockopt+0x24f/0x390
[   47.127457]  do_group_exit+0x16f/0x430
[   47.131322]  ? mm_fault_error+0x380/0x380
[   47.135446]  ? __ia32_sys_exit+0x50/0x50
[   47.139489]  ? do_syscall_64+0x92/0x800
[   47.143444]  __x64_sys_exit_group+0x3e/0x50
[   47.147744]  do_syscall_64+0x1b1/0x800
[   47.151610]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   47.156431]  ? syscall_return_slowpath+0x5c0/0x5c0
[   47.161338]  ? syscall_return_slowpath+0x30f/0x5c0
[   47.166261]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   47.171606]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   47.176480]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   47.181650] RIP: 0033:0x43e8d8
[   47.184815] RSP: 002b:00007ffc37a6c678 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   47.192505] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8
[   47.199755] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   47.207033] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0
[   47.214282] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001
[   47.221527] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   47.229273] Dumping ftrace buffer:
[   47.232869]    (ftrace buffer empty)
[   47.236554] Kernel Offset: disabled
[   47.240162] Rebooting in 86400 seconds..