[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   22.534498] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   23.464846] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.819716] random: sshd: uninitialized urandom read (32 bytes read)
[   24.540415] random: sshd: uninitialized urandom read (32 bytes read)
[   24.698428] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts.
[   30.224550] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   30.316993] WARNING: CPU: 1 PID: 4510 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0
[   30.325401] Kernel panic - not syncing: panic_on_warn set ...
[   30.325401] 
[   30.332757] CPU: 1 PID: 4510 Comm: syz-executor245 Not tainted 4.17.0-rc2+ #26
[   30.340098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.349438] Call Trace:
[   30.352021]  dump_stack+0x1b9/0x294
[   30.355648]  ? dump_stack_print_info.cold.2+0x52/0x52
[   30.360879]  ? smc_unhash_sk+0x290/0x4a0
[   30.364926]  panic+0x22f/0x4de
[   30.368099]  ? add_taint.cold.5+0x16/0x16
[   30.372232]  ? __warn.cold.8+0x148/0x1b3
[   30.376281]  ? __warn.cold.8+0x117/0x1b3
[   30.380325]  ? smc_unhash_sk+0x345/0x4a0
[   30.384369]  __warn.cold.8+0x163/0x1b3
[   30.388241]  ? smc_unhash_sk+0x345/0x4a0
[   30.392285]  report_bug+0x252/0x2d0
[   30.395895]  do_error_trap+0x1de/0x490
[   30.399780]  ? graph_lock+0x170/0x170
[   30.403562]  ? math_error+0x420/0x420
[   30.407350]  ? lock_acquire+0x1dc/0x520
[   30.411309]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.416134]  do_invalid_op+0x1b/0x20
[   30.419841]  invalid_op+0x14/0x20
[   30.423295] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   30.427943] RSP: 0018:ffff8801ad887488 EFLAGS: 00010293
[   30.433287] RAX: ffff8801ade9c6c0 RBX: ffff8801ada9e7c0 RCX: ffffffff873faafe
[   30.440552] RDX: 0000000000000000 RSI: ffffffff873fabb5 RDI: 0000000000000005
[   30.447805] RBP: ffff8801ad887570 R08: ffff8801ade9c6c0 R09: ffffed0035b53d08
[   30.455063] R10: ffffed0035b53d08 R11: ffff8801ada9e843 R12: 1ffff10035b10e95
[   30.462321] R13: ffff8801ad887548 R14: ffffffff8970df20 R15: ffff8801ada9e840
[   30.469586]  ? smc_unhash_sk+0x28e/0x4a0
[   30.473632]  ? smc_unhash_sk+0x345/0x4a0
[   30.477686]  ? smc_unhash_sk+0x345/0x4a0
[   30.481728]  ? smc_hash_sk+0x2f0/0x2f0
[   30.485599]  ? release_sock+0x1e2/0x2b0
[   30.489558]  ? __local_bh_enable_ip+0x161/0x230
[   30.494210]  ? __release_sock+0x3a0/0x3a0
[   30.498341]  ? smc_release+0x269/0x610
[   30.502220]  ? trace_hardirqs_on+0xd/0x10
[   30.506356]  ? __local_bh_enable_ip+0x161/0x230
[   30.511015]  smc_release+0x36e/0x610
[   30.514749]  sock_release+0x96/0x1b0
[   30.518489]  ? sock_alloc_file+0x4e0/0x4e0
[   30.522895]  sock_close+0x16/0x20
[   30.526346]  __fput+0x34d/0x890
[   30.529630]  ? fput+0x1a0/0x1a0
[   30.532935]  ? _raw_spin_unlock_irq+0x27/0x70
[   30.537453]  ____fput+0x15/0x20
[   30.540727]  task_work_run+0x1e4/0x290
[   30.544602]  ? task_work_cancel+0x240/0x240
[   30.548921]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   30.554463]  ? switch_task_namespaces+0xa2/0xd0
[   30.559120]  do_exit+0x1aee/0x2730
[   30.562662]  ? mm_update_next_owner+0x980/0x980
[   30.567325]  ? lock_downgrade+0x8e0/0x8e0
[   30.571458]  ? noop_count+0x40/0x40
[   30.575070]  ? lock_pin_lock+0x350/0x350
[   30.579119]  ? kasan_check_read+0x11/0x20
[   30.583250]  ? rcu_is_watching+0x85/0x140
[   30.587388]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   30.592563]  ? is_bpf_text_address+0xd7/0x170
[   30.597047]  ? check_usage_backwards+0x151/0x3a0
[   30.601790]  ? graph_lock+0x170/0x170
[   30.605573]  ? graph_lock+0x170/0x170
[   30.609360]  ? find_held_lock+0x36/0x1c0
[   30.613415]  ? lock_downgrade+0x8e0/0x8e0
[   30.617551]  ? kasan_check_read+0x11/0x20
[   30.621681]  ? do_raw_spin_unlock+0x9e/0x2e0
[   30.626082]  ? __local_bh_enable_ip+0x161/0x230
[   30.630736]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   30.635741]  ? release_sock+0x1e2/0x2b0
[   30.639718]  ? trace_hardirqs_on+0xd/0x10
[   30.643850]  ? __local_bh_enable_ip+0x161/0x230
[   30.648504]  ? _raw_spin_unlock_bh+0x30/0x40
[   30.652898]  ? release_sock+0x1e2/0x2b0
[   30.656856]  ? __release_sock+0x3a0/0x3a0
[   30.660991]  ? __local_bh_enable_ip+0x161/0x230
[   30.665650]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   30.670823]  ? smc_setsockopt+0x1ed/0x630
[   30.674958]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.680485]  ? __sys_setsockopt+0x24f/0x390
[   30.685063]  do_group_exit+0x16f/0x430
[   30.688935]  ? mm_fault_error+0x380/0x380
[   30.693071]  ? __ia32_sys_exit+0x50/0x50
[   30.697119]  ? do_syscall_64+0x92/0x800
[   30.701080]  __x64_sys_exit_group+0x3e/0x50
[   30.705391]  do_syscall_64+0x1b1/0x800
[   30.709268]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   30.714102]  ? syscall_return_slowpath+0x5c0/0x5c0
[   30.719031]  ? syscall_return_slowpath+0x30f/0x5c0
[   30.723951]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   30.729297]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.734125]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   30.739302] RIP: 0033:0x43e8d8
[   30.742474] RSP: 002b:00007ffd603faee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   30.750164] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8
[   30.757413] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   30.764663] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0
[   30.771919] R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001
[   30.779170] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   30.787009] Dumping ftrace buffer:
[   30.790695]    (ftrace buffer empty)
[   30.794403] Kernel Offset: disabled
[   30.798028] Rebooting in 86400 seconds..