[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.105224] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   20.358507] random: sshd: uninitialized urandom read (32 bytes read)
[   20.683074] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   21.428934] random: sshd: uninitialized urandom read (32 bytes read)
[   21.590391] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts.
[   27.032261] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   27.125951] WARNING: CPU: 0 PID: 4548 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   27.134350] Kernel panic - not syncing: panic_on_warn set ...
[   27.134350] 
[   27.141700] CPU: 0 PID: 4548 Comm: syz-executor903 Not tainted 4.17.0-rc4+ #45
[   27.149043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.158388] Call Trace:
[   27.160964]  dump_stack+0x1b9/0x294
[   27.164573]  ? dump_stack_print_info.cold.2+0x52/0x52
[   27.169755]  ? smc_unhash_sk+0x330/0x4a0
[   27.173802]  panic+0x22f/0x4de
[   27.176974]  ? add_taint.cold.5+0x16/0x16
[   27.181110]  ? __warn.cold.8+0x148/0x1b3
[   27.185155]  ? __warn.cold.8+0x117/0x1b3
[   27.189211]  ? smc_unhash_sk+0x345/0x4a0
[   27.193256]  __warn.cold.8+0x163/0x1b3
[   27.197133]  ? smc_unhash_sk+0x345/0x4a0
[   27.201178]  report_bug+0x252/0x2d0
[   27.204790]  do_error_trap+0x1de/0x490
[   27.208661]  ? graph_lock+0x170/0x170
[   27.212446]  ? math_error+0x420/0x420
[   27.216236]  ? lock_acquire+0x1dc/0x520
[   27.220204]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   27.225043]  do_invalid_op+0x1b/0x20
[   27.228752]  invalid_op+0x14/0x20
[   27.232190] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   27.236835] RSP: 0018:ffff8801ace5f488 EFLAGS: 00010293
[   27.242192] RAX: ffff8801b1522600 RBX: ffff8801ad5517c0 RCX: ffffffff8740565e
[   27.249443] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005
[   27.256692] RBP: ffff8801ace5f570 R08: ffff8801b1522600 R09: ffffed0035aaa308
[   27.263949] R10: ffffed0035aaa308 R11: ffff8801ad551843 R12: 1ffff100359cbe95
[   27.271211] R13: ffff8801ace5f548 R14: ffffffff8970cba0 R15: ffff8801ad551840
[   27.278482]  ? smc_unhash_sk+0x28e/0x4a0
[   27.282525]  ? smc_unhash_sk+0x345/0x4a0
[   27.286569]  ? smc_unhash_sk+0x345/0x4a0
[   27.290627]  ? smc_rx_data_available+0x100/0x100
[   27.295368]  ? release_sock+0x1e2/0x2b0
[   27.299328]  ? __local_bh_enable_ip+0x161/0x230
[   27.303977]  ? __release_sock+0x3a0/0x3a0
[   27.308108]  ? smc_release+0x269/0x610
[   27.311978]  ? trace_hardirqs_on+0xd/0x10
[   27.316109]  ? __local_bh_enable_ip+0x161/0x230
[   27.320769]  smc_release+0x36e/0x610
[   27.324468]  sock_release+0x96/0x1b0
[   27.328165]  ? sock_alloc_file+0x4e0/0x4e0
[   27.332383]  sock_close+0x16/0x20
[   27.335820]  __fput+0x34d/0x890
[   27.339082]  ? fput+0x1a0/0x1a0
[   27.342356]  ? _raw_spin_unlock_irq+0x27/0x70
[   27.346835]  ____fput+0x15/0x20
[   27.350106]  task_work_run+0x1e4/0x290
[   27.353976]  ? task_work_cancel+0x240/0x240
[   27.358297]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   27.363816]  ? switch_task_namespaces+0xa2/0xd0
[   27.368468]  do_exit+0x1aee/0x2730
[   27.371991]  ? mm_update_next_owner+0x980/0x980
[   27.376650]  ? lock_downgrade+0x8e0/0x8e0
[   27.380776]  ? noop_count+0x40/0x40
[   27.384383]  ? lock_pin_lock+0x350/0x350
[   27.388430]  ? kasan_check_read+0x11/0x20
[   27.392558]  ? rcu_is_watching+0x85/0x140
[   27.396688]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   27.401861]  ? is_bpf_text_address+0xd7/0x170
[   27.406338]  ? check_usage_backwards+0x151/0x3a0
[   27.411073]  ? graph_lock+0x170/0x170
[   27.414854]  ? graph_lock+0x170/0x170
[   27.418640]  ? find_held_lock+0x36/0x1c0
[   27.422687]  ? lock_downgrade+0x8e0/0x8e0
[   27.426826]  ? kasan_check_read+0x11/0x20
[   27.430955]  ? do_raw_spin_unlock+0x9e/0x2e0
[   27.435349]  ? __local_bh_enable_ip+0x161/0x230
[   27.439998]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   27.444995]  ? release_sock+0x1e2/0x2b0
[   27.448956]  ? trace_hardirqs_on+0xd/0x10
[   27.453110]  ? __local_bh_enable_ip+0x161/0x230
[   27.457786]  ? _raw_spin_unlock_bh+0x30/0x40
[   27.462178]  ? release_sock+0x1e2/0x2b0
[   27.466136]  ? __release_sock+0x3a0/0x3a0
[   27.470269]  ? __local_bh_enable_ip+0x161/0x230
[   27.474923]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   27.480104]  ? smc_setsockopt+0x1ed/0x630
[   27.484238]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   27.489758]  ? __sys_setsockopt+0x24f/0x390
[   27.494070]  do_group_exit+0x16f/0x430
[   27.497946]  ? mm_fault_error+0x380/0x380
[   27.502076]  ? __ia32_sys_exit+0x50/0x50
[   27.506130]  ? do_syscall_64+0x92/0x800
[   27.510091]  __x64_sys_exit_group+0x3e/0x50
[   27.514394]  do_syscall_64+0x1b1/0x800
[   27.518261]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   27.523095]  ? syscall_return_slowpath+0x5c0/0x5c0
[   27.528004]  ? syscall_return_slowpath+0x30f/0x5c0
[   27.532918]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   27.538270]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   27.543100]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   27.548269] RIP: 0033:0x43e8d8
[   27.551447] RSP: 002b:00007ffe955b10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   27.559145] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8
[   27.566406] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   27.573658] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0
[   27.580918] R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000000001
[   27.588180] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   27.596112] Dumping ftrace buffer:
[   27.599768]    (ftrace buffer empty)
[   27.603457] Kernel Offset: disabled
[   27.607067] Rebooting in 86400 seconds..