[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.438590] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.445798] random: sshd: uninitialized urandom read (32 bytes read)
[   24.786683] random: sshd: uninitialized urandom read (32 bytes read)
[   25.542623] random: sshd: uninitialized urandom read (32 bytes read)
[   25.698131] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts.
[   31.162162] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   31.252817] WARNING: CPU: 0 PID: 4511 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   31.261211] Kernel panic - not syncing: panic_on_warn set ...
[   31.261211] 
[   31.268564] CPU: 0 PID: 4511 Comm: syz-executor590 Not tainted 4.17.0-rc3+ #33
[   31.275901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.285319] Call Trace:
[   31.287890]  dump_stack+0x1b9/0x294
[   31.291499]  ? dump_stack_print_info.cold.2+0x52/0x52
[   31.296670]  ? smc_unhash_sk+0x270/0x4a0
[   31.300711]  panic+0x22f/0x4de
[   31.303884]  ? add_taint.cold.5+0x16/0x16
[   31.308021]  ? __warn.cold.8+0x148/0x1b3
[   31.312065]  ? __warn.cold.8+0x117/0x1b3
[   31.316108]  ? smc_unhash_sk+0x345/0x4a0
[   31.320149]  __warn.cold.8+0x163/0x1b3
[   31.324022]  ? smc_unhash_sk+0x345/0x4a0
[   31.328078]  report_bug+0x252/0x2d0
[   31.331684]  do_error_trap+0x1de/0x490
[   31.335548]  ? graph_lock+0x170/0x170
[   31.339328]  ? math_error+0x420/0x420
[   31.343109]  ? lock_acquire+0x1dc/0x520
[   31.347066]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   31.351886]  do_invalid_op+0x1b/0x20
[   31.355579]  invalid_op+0x14/0x20
[   31.359018] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   31.363667] RSP: 0018:ffff8801ad14f488 EFLAGS: 00010293
[   31.369009] RAX: ffff8801ad8204c0 RBX: ffff8801d95be7c0 RCX: ffffffff873fe71e
[   31.376268] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005
[   31.383514] RBP: ffff8801ad14f570 R08: ffff8801ad8204c0 R09: ffffed003b2b7d08
[   31.390761] R10: ffffed003b2b7d08 R11: ffff8801d95be843 R12: 1ffff10035a29e95
[   31.398010] R13: ffff8801ad14f548 R14: ffffffff8970e4e0 R15: ffff8801d95be840
[   31.405274]  ? smc_unhash_sk+0x28e/0x4a0
[   31.409312]  ? smc_unhash_sk+0x345/0x4a0
[   31.413351]  ? smc_unhash_sk+0x345/0x4a0
[   31.417403]  ? smc_rx_data_available+0x100/0x100
[   31.422139]  ? release_sock+0x1e2/0x2b0
[   31.426103]  ? __local_bh_enable_ip+0x161/0x230
[   31.430748]  ? __release_sock+0x3a0/0x3a0
[   31.434874]  ? smc_release+0x269/0x610
[   31.438738]  ? trace_hardirqs_on+0xd/0x10
[   31.442865]  ? __local_bh_enable_ip+0x161/0x230
[   31.447515]  smc_release+0x36e/0x610
[   31.451212]  sock_release+0x96/0x1b0
[   31.454904]  ? sock_alloc_file+0x4e0/0x4e0
[   31.459126]  sock_close+0x16/0x20
[   31.462561]  __fput+0x34d/0x890
[   31.465823]  ? fput+0x1a0/0x1a0
[   31.469082]  ? _raw_spin_unlock_irq+0x27/0x70
[   31.473557]  ____fput+0x15/0x20
[   31.476817]  task_work_run+0x1e4/0x290
[   31.480682]  ? task_work_cancel+0x240/0x240
[   31.484983]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   31.490508]  ? switch_task_namespaces+0xa2/0xd0
[   31.495159]  do_exit+0x1aee/0x2730
[   31.498688]  ? mm_update_next_owner+0x980/0x980
[   31.503335]  ? lock_downgrade+0x8e0/0x8e0
[   31.507469]  ? noop_count+0x40/0x40
[   31.511073]  ? lock_pin_lock+0x350/0x350
[   31.515116]  ? kasan_check_read+0x11/0x20
[   31.519243]  ? rcu_is_watching+0x85/0x140
[   31.523370]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   31.528545]  ? is_bpf_text_address+0xd7/0x170
[   31.533031]  ? check_usage_backwards+0x151/0x3a0
[   31.537780]  ? graph_lock+0x170/0x170
[   31.541560]  ? graph_lock+0x170/0x170
[   31.545346]  ? find_held_lock+0x36/0x1c0
[   31.549391]  ? lock_downgrade+0x8e0/0x8e0
[   31.553522]  ? kasan_check_read+0x11/0x20
[   31.557647]  ? do_raw_spin_unlock+0x9e/0x2e0
[   31.562041]  ? __local_bh_enable_ip+0x161/0x230
[   31.566689]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   31.571685]  ? release_sock+0x1e2/0x2b0
[   31.575638]  ? trace_hardirqs_on+0xd/0x10
[   31.579765]  ? __local_bh_enable_ip+0x161/0x230
[   31.584414]  ? _raw_spin_unlock_bh+0x30/0x40
[   31.588804]  ? release_sock+0x1e2/0x2b0
[   31.592767]  ? __release_sock+0x3a0/0x3a0
[   31.596895]  ? __local_bh_enable_ip+0x161/0x230
[   31.601544]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   31.606713]  ? smc_setsockopt+0x1ed/0x630
[   31.610840]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.616357]  ? __sys_setsockopt+0x24f/0x390
[   31.620662]  do_group_exit+0x16f/0x430
[   31.624530]  ? mm_fault_error+0x380/0x380
[   31.628656]  ? __ia32_sys_exit+0x50/0x50
[   31.632699]  ? do_syscall_64+0x92/0x800
[   31.636652]  __x64_sys_exit_group+0x3e/0x50
[   31.640955]  do_syscall_64+0x1b1/0x800
[   31.644821]  ? syscall_return_slowpath+0x5c0/0x5c0
[   31.649729]  ? syscall_return_slowpath+0x30f/0x5c0
[   31.654641]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   31.659987]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   31.664817]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   31.669985] RIP: 0033:0x43e8d8
[   31.673153] RSP: 002b:00007ffecadcec48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   31.680837] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8
[   31.688084] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   31.695333] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0
[   31.702582] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001
[   31.709831] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   31.717696] Dumping ftrace buffer:
[   31.721307]    (ftrace buffer empty)
[   31.724997] Kernel Offset: disabled
[   31.728605] Rebooting in 86400 seconds..