[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.944415] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.191988] random: sshd: uninitialized urandom read (32 bytes read)
[   24.458963] random: sshd: uninitialized urandom read (32 bytes read)
[   25.180810] random: sshd: uninitialized urandom read (32 bytes read)
[   25.346151] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts.
[   30.826701] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   30.921919] WARNING: CPU: 0 PID: 4437 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   30.930327] Kernel panic - not syncing: panic_on_warn set ...
[   30.930327] 
[   30.937681] CPU: 0 PID: 4437 Comm: syz-executor025 Not tainted 4.17.0-rc2+ #32
[   30.945019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.954354] Call Trace:
[   30.956929]  dump_stack+0x1b9/0x294
[   30.960542]  ? dump_stack_print_info.cold.2+0x52/0x52
[   30.965722]  ? smc_unhash_sk+0x2f0/0x4a0
[   30.969765]  panic+0x22f/0x4de
[   30.972938]  ? add_taint.cold.5+0x16/0x16
[   30.977074]  ? __warn.cold.8+0x148/0x1b3
[   30.981113]  ? __warn.cold.8+0x117/0x1b3
[   30.985153]  ? smc_unhash_sk+0x345/0x4a0
[   30.989193]  __warn.cold.8+0x163/0x1b3
[   30.993063]  ? smc_unhash_sk+0x345/0x4a0
[   30.997106]  report_bug+0x252/0x2d0
[   31.000719]  do_error_trap+0x1de/0x490
[   31.004602]  ? graph_lock+0x170/0x170
[   31.008384]  ? math_error+0x420/0x420
[   31.012168]  ? lock_acquire+0x1dc/0x520
[   31.016124]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   31.020956]  do_invalid_op+0x1b/0x20
[   31.024651]  invalid_op+0x14/0x20
[   31.028095] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   31.032753] RSP: 0018:ffff8801bda9f488 EFLAGS: 00010293
[   31.038097] RAX: ffff8801bf428680 RBX: ffff8801bdb267c0 RCX: ffffffff873fce9e
[   31.045351] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005
[   31.052605] RBP: ffff8801bda9f570 R08: ffff8801bf428680 R09: ffffed0037b64d08
[   31.059854] R10: ffffed0037b64d08 R11: ffff8801bdb26843 R12: 1ffff10037b53e95
[   31.067100] R13: ffff8801bda9f548 R14: ffffffff8970e060 R15: ffff8801bdb26840
[   31.074362]  ? smc_unhash_sk+0x28e/0x4a0
[   31.078400]  ? smc_unhash_sk+0x345/0x4a0
[   31.082440]  ? smc_unhash_sk+0x345/0x4a0
[   31.086480]  ? smc_hash_sk+0x2f0/0x2f0
[   31.090354]  ? release_sock+0x1e2/0x2b0
[   31.094313]  ? __local_bh_enable_ip+0x161/0x230
[   31.098962]  ? __release_sock+0x3a0/0x3a0
[   31.103089]  ? smc_release+0x269/0x610
[   31.107130]  ? trace_hardirqs_on+0xd/0x10
[   31.111265]  ? __local_bh_enable_ip+0x161/0x230
[   31.115912]  smc_release+0x36e/0x610
[   31.119610]  sock_release+0x96/0x1b0
[   31.123301]  ? sock_alloc_file+0x4e0/0x4e0
[   31.127514]  sock_close+0x16/0x20
[   31.130948]  __fput+0x34d/0x890
[   31.134211]  ? fput+0x1a0/0x1a0
[   31.137472]  ? _raw_spin_unlock_irq+0x27/0x70
[   31.141959]  ____fput+0x15/0x20
[   31.145225]  task_work_run+0x1e4/0x290
[   31.149090]  ? task_work_cancel+0x240/0x240
[   31.153393]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   31.158923]  ? switch_task_namespaces+0xa2/0xd0
[   31.163586]  do_exit+0x1aee/0x2730
[   31.167120]  ? mm_update_next_owner+0x980/0x980
[   31.171775]  ? kasan_check_write+0x14/0x20
[   31.175991]  ? do_raw_spin_lock+0xc1/0x200
[   31.180209]  ? trace_hardirqs_off+0xd/0x10
[   31.184426]  ? _raw_spin_unlock_irqrestore+0x63/0xc0
[   31.189518]  ? debug_check_no_obj_freed+0x2ff/0x584
[   31.194514]  ? __local_bh_enable_ip+0x161/0x230
[   31.199169]  ? kasan_check_read+0x11/0x20
[   31.203298]  ? rcu_is_watching+0x85/0x140
[   31.207426]  ? rcu_pm_notify+0xc0/0xc0
[   31.211298]  ? ___sys_sendmsg+0x31a/0x940
[   31.215427]  ? kfree+0x1e9/0x260
[   31.218772]  ? ___sys_sendmsg+0x31f/0x940
[   31.222901]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.228422]  ? copy_msghdr_from_user+0x560/0x560
[   31.233160]  ? vm_insert_mixed_mkwrite+0x40/0x40
[   31.237895]  ? graph_lock+0x170/0x170
[   31.241686]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.247205]  ? __fget_light+0x2ef/0x430
[   31.251156]  ? fget_raw+0x20/0x20
[   31.254594]  ? find_held_lock+0x36/0x1c0
[   31.258657]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   31.264175]  ? sockfd_lookup_light+0xc5/0x160
[   31.268653]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.274172]  ? __sys_sendmsg+0x1aa/0x270
[   31.278215]  ? __ia32_sys_shutdown+0x80/0x80
[   31.282607]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.288123]  ? __do_page_fault+0x441/0xe40
[   31.292354]  do_group_exit+0x16f/0x430
[   31.296223]  ? __ia32_sys_exit+0x50/0x50
[   31.300269]  ? do_syscall_64+0x92/0x800
[   31.304234]  __x64_sys_exit_group+0x3e/0x50
[   31.308544]  do_syscall_64+0x1b1/0x800
[   31.312428]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   31.317252]  ? syscall_return_slowpath+0x5c0/0x5c0
[   31.322162]  ? syscall_return_slowpath+0x30f/0x5c0
[   31.327078]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   31.332423]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   31.337250]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   31.342418] RIP: 0033:0x43ea28
[   31.345585] RSP: 002b:00007ffefb1fced8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   31.353271] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea28
[   31.360522] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   31.367773] RBP: 00000000004be3c0 R08: 00000000000000e7 R09: ffffffffffffffd0
[   31.375028] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001
[   31.382452] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   31.390394] Dumping ftrace buffer:
[   31.394060]    (ftrace buffer empty)
[   31.397749] Kernel Offset: disabled
[   31.401359] Rebooting in 86400 seconds..