[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.030118] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.983511] random: sshd: uninitialized urandom read (32 bytes read)
[   24.415259] random: sshd: uninitialized urandom read (32 bytes read)
[   25.106855] random: sshd: uninitialized urandom read (32 bytes read)
[   36.654893] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts.
[   42.083093] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   42.173783] WARNING: CPU: 1 PID: 4492 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   42.182155] Kernel panic - not syncing: panic_on_warn set ...
[   42.182155] 
[   42.189512] CPU: 1 PID: 4492 Comm: syz-executor784 Not tainted 4.17.0-rc3+ #35
[   42.196850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   42.206186] Call Trace:
[   42.208765]  dump_stack+0x1b9/0x294
[   42.212374]  ? dump_stack_print_info.cold.2+0x52/0x52
[   42.217550]  ? smc_unhash_sk+0x310/0x4a0
[   42.221593]  panic+0x22f/0x4de
[   42.224763]  ? add_taint.cold.5+0x16/0x16
[   42.228893]  ? __warn.cold.8+0x148/0x1b3
[   42.232934]  ? __warn.cold.8+0x117/0x1b3
[   42.237082]  ? smc_unhash_sk+0x345/0x4a0
[   42.241164]  __warn.cold.8+0x163/0x1b3
[   42.245050]  ? smc_unhash_sk+0x345/0x4a0
[   42.249092]  report_bug+0x252/0x2d0
[   42.252700]  do_error_trap+0x1de/0x490
[   42.256568]  ? graph_lock+0x170/0x170
[   42.260356]  ? math_error+0x420/0x420
[   42.264149]  ? lock_acquire+0x1dc/0x520
[   42.268197]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   42.273023]  do_invalid_op+0x1b/0x20
[   42.276716]  invalid_op+0x14/0x20
[   42.280205] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   42.284848] RSP: 0018:ffff8801adf37488 EFLAGS: 00010293
[   42.290189] RAX: ffff8801b7680500 RBX: ffff8801ade0e7c0 RCX: ffffffff87402b7e
[   42.297441] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005
[   42.304913] RBP: ffff8801adf37570 R08: ffff8801b7680500 R09: ffffed0035bc1d08
[   42.312173] R10: ffffed0035bc1d08 R11: ffff8801ade0e843 R12: 1ffff10035be6e95
[   42.319426] R13: ffff8801adf37548 R14: ffffffff8970e8a0 R15: ffff8801ade0e840
[   42.326689]  ? smc_unhash_sk+0x28e/0x4a0
[   42.330735]  ? smc_unhash_sk+0x345/0x4a0
[   42.334779]  ? smc_unhash_sk+0x345/0x4a0
[   42.338826]  ? smc_rx_data_available+0x100/0x100
[   42.343564]  ? release_sock+0x1e2/0x2b0
[   42.347520]  ? __local_bh_enable_ip+0x161/0x230
[   42.352166]  ? __release_sock+0x3a0/0x3a0
[   42.356293]  ? smc_release+0x269/0x610
[   42.360160]  ? trace_hardirqs_on+0xd/0x10
[   42.364298]  ? __local_bh_enable_ip+0x161/0x230
[   42.368947]  smc_release+0x36e/0x610
[   42.372647]  sock_release+0x96/0x1b0
[   42.376344]  ? sock_alloc_file+0x4e0/0x4e0
[   42.380645]  sock_close+0x16/0x20
[   42.384077]  __fput+0x34d/0x890
[   42.387345]  ? fput+0x1a0/0x1a0
[   42.390634]  ? _raw_spin_unlock_irq+0x27/0x70
[   42.395110]  ____fput+0x15/0x20
[   42.398371]  task_work_run+0x1e4/0x290
[   42.402235]  ? task_work_cancel+0x240/0x240
[   42.406539]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   42.412053]  ? switch_task_namespaces+0xa2/0xd0
[   42.416700]  do_exit+0x1aee/0x2730
[   42.420222]  ? mm_update_next_owner+0x980/0x980
[   42.424872]  ? kasan_check_write+0x14/0x20
[   42.429090]  ? do_raw_spin_lock+0xc1/0x200
[   42.433305]  ? trace_hardirqs_off+0xd/0x10
[   42.437517]  ? _raw_spin_unlock_irqrestore+0x63/0xc0
[   42.442706]  ? debug_check_no_obj_freed+0x2ff/0x584
[   42.447700]  ? __local_bh_enable_ip+0x161/0x230
[   42.452350]  ? kasan_check_read+0x11/0x20
[   42.456565]  ? rcu_is_watching+0x85/0x140
[   42.460692]  ? rcu_pm_notify+0xc0/0xc0
[   42.464648]  ? ___sys_sendmsg+0x31a/0x940
[   42.469384]  ? kfree+0x1e9/0x260
[   42.472728]  ? ___sys_sendmsg+0x31f/0x940
[   42.476857]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   42.482377]  ? copy_msghdr_from_user+0x560/0x560
[   42.487117]  ? vm_insert_mixed_mkwrite+0x40/0x40
[   42.491860]  ? graph_lock+0x170/0x170
[   42.495650]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   42.501168]  ? __fget_light+0x2ef/0x430
[   42.505123]  ? fget_raw+0x20/0x20
[   42.508555]  ? find_held_lock+0x36/0x1c0
[   42.512623]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   42.518157]  ? sockfd_lookup_light+0xc5/0x160
[   42.522635]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   42.528149]  ? __sys_sendmsg+0x1aa/0x270
[   42.532189]  ? __ia32_sys_shutdown+0x80/0x80
[   42.536578]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   42.542095]  ? __do_page_fault+0x441/0xe40
[   42.546321]  do_group_exit+0x16f/0x430
[   42.550191]  ? __ia32_sys_exit+0x50/0x50
[   42.554242]  ? do_syscall_64+0x92/0x800
[   42.558196]  __x64_sys_exit_group+0x3e/0x50
[   42.562498]  do_syscall_64+0x1b1/0x800
[   42.566368]  ? syscall_return_slowpath+0x5c0/0x5c0
[   42.571280]  ? syscall_return_slowpath+0x30f/0x5c0
[   42.576192]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   42.581553]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   42.586389]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   42.591559] RIP: 0033:0x43eab8
[   42.594727] RSP: 002b:00007fff1b258068 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   42.602413] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eab8
[   42.609781] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   42.617119] RBP: 00000000004be460 R08: 00000000000000e7 R09: ffffffffffffffd0
[   42.624370] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001
[   42.631628] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   42.639690] Dumping ftrace buffer:
[   42.643298]    (ftrace buffer empty)
[   42.646999] Kernel Offset: disabled
[   42.650608] Rebooting in 86400 seconds..