[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.809518] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.508062] random: sshd: uninitialized urandom read (32 bytes read)
[   22.950816] random: sshd: uninitialized urandom read (32 bytes read)
[   23.706654] random: sshd: uninitialized urandom read (32 bytes read)
[   23.865088] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts.
[   29.338188] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   29.445479] WARNING: CPU: 0 PID: 4532 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   29.453878] Kernel panic - not syncing: panic_on_warn set ...
[   29.453878] 
[   29.461232] CPU: 0 PID: 4532 Comm: syz-executor753 Not tainted 4.17.0-rc4+ #56
[   29.468607] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.477940] Call Trace:
[   29.480519]  dump_stack+0x1b9/0x294
[   29.484128]  ? dump_stack_print_info.cold.2+0x52/0x52
[   29.489302]  ? smc_unhash_sk+0x340/0x4a0
[   29.493344]  panic+0x22f/0x4de
[   29.496519]  ? add_taint.cold.5+0x16/0x16
[   29.500650]  ? __warn.cold.8+0x148/0x1b3
[   29.504696]  ? __warn.cold.8+0x117/0x1b3
[   29.508738]  ? smc_unhash_sk+0x345/0x4a0
[   29.512783]  __warn.cold.8+0x163/0x1b3
[   29.516652]  ? smc_unhash_sk+0x345/0x4a0
[   29.520693]  report_bug+0x252/0x2d0
[   29.524301]  do_error_trap+0x1de/0x490
[   29.528168]  ? graph_lock+0x170/0x170
[   29.531947]  ? math_error+0x420/0x420
[   29.535733]  ? lock_acquire+0x1dc/0x520
[   29.539690]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.544515]  do_invalid_op+0x1b/0x20
[   29.548225]  invalid_op+0x14/0x20
[   29.551662] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   29.556307] RSP: 0018:ffff8801ae3ff488 EFLAGS: 00010293
[   29.561651] RAX: ffff8801d9752340 RBX: ffff8801aea837c0 RCX: ffffffff8740fd4e
[   29.568902] RDX: 0000000000000000 RSI: ffffffff8740fe05 RDI: 0000000000000005
[   29.576152] RBP: ffff8801ae3ff570 R08: ffff8801d9752340 R09: ffffed0035d50708
[   29.583404] R10: ffffed0035d50708 R11: ffff8801aea83843 R12: 1ffff10035c7fe95
[   29.590658] R13: ffff8801ae3ff548 R14: ffffffff8970dd60 R15: ffff8801aea83840
[   29.597923]  ? smc_unhash_sk+0x28e/0x4a0
[   29.601972]  ? smc_unhash_sk+0x345/0x4a0
[   29.606037]  ? smc_unhash_sk+0x345/0x4a0
[   29.610079]  ? smc_rx_data_available+0x100/0x100
[   29.614815]  ? release_sock+0x1e2/0x2b0
[   29.618773]  ? __local_bh_enable_ip+0x161/0x230
[   29.623422]  ? __release_sock+0x3a0/0x3a0
[   29.627550]  ? smc_release+0x269/0x610
[   29.631417]  ? trace_hardirqs_on+0xd/0x10
[   29.636115]  ? __local_bh_enable_ip+0x161/0x230
[   29.640774]  smc_release+0x36e/0x610
[   29.644477]  sock_release+0x96/0x1b0
[   29.648182]  ? sock_alloc_file+0x4e0/0x4e0
[   29.652412]  sock_close+0x16/0x20
[   29.655847]  __fput+0x34d/0x890
[   29.659117]  ? fput+0x1a0/0x1a0
[   29.662381]  ? _raw_spin_unlock_irq+0x27/0x70
[   29.666868]  ____fput+0x15/0x20
[   29.670131]  task_work_run+0x1e4/0x290
[   29.673998]  ? task_work_cancel+0x240/0x240
[   29.678317]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   29.683837]  ? switch_task_namespaces+0xa2/0xd0
[   29.688489]  do_exit+0x1aee/0x2730
[   29.692039]  ? mm_update_next_owner+0x980/0x980
[   29.696697]  ? lock_downgrade+0x8e0/0x8e0
[   29.700829]  ? noop_count+0x40/0x40
[   29.704444]  ? lock_pin_lock+0x350/0x350
[   29.708489]  ? kasan_check_read+0x11/0x20
[   29.712617]  ? rcu_is_watching+0x85/0x140
[   29.716744]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   29.721916]  ? print_usage_bug+0xc0/0xc0
[   29.725963]  ? is_bpf_text_address+0xd7/0x170
[   29.730446]  ? check_usage_backwards+0x151/0x3a0
[   29.735185]  ? graph_lock+0x170/0x170
[   29.738966]  ? graph_lock+0x170/0x170
[   29.742752]  ? find_held_lock+0x36/0x1c0
[   29.746797]  ? lock_downgrade+0x8e0/0x8e0
[   29.750935]  ? kasan_check_read+0x11/0x20
[   29.755063]  ? do_raw_spin_unlock+0x9e/0x2e0
[   29.759452]  ? __local_bh_enable_ip+0x161/0x230
[   29.764116]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   29.769116]  ? release_sock+0x1e2/0x2b0
[   29.773073]  ? trace_hardirqs_on+0xd/0x10
[   29.777200]  ? __local_bh_enable_ip+0x161/0x230
[   29.781853]  ? _raw_spin_unlock_bh+0x30/0x40
[   29.786256]  ? release_sock+0x1e2/0x2b0
[   29.790210]  ? __release_sock+0x3a0/0x3a0
[   29.794342]  ? __local_bh_enable_ip+0x161/0x230
[   29.798993]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   29.804171]  ? smc_setsockopt+0x1ed/0x6d0
[   29.808301]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.813816]  ? __sys_setsockopt+0x24f/0x390
[   29.818126]  do_group_exit+0x16f/0x430
[   29.821996]  ? mm_fault_error+0x380/0x380
[   29.826129]  ? __ia32_sys_exit+0x50/0x50
[   29.830173]  ? do_syscall_64+0x92/0x800
[   29.834132]  __x64_sys_exit_group+0x3e/0x50
[   29.838434]  do_syscall_64+0x1b1/0x800
[   29.842324]  ? syscall_return_slowpath+0x5c0/0x5c0
[   29.847236]  ? syscall_return_slowpath+0x30f/0x5c0
[   29.852151]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   29.857499]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.862327]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   29.867496] RIP: 0033:0x43e8d8
[   29.870666] RSP: 002b:00007ffeebce29c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   29.878354] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8
[   29.885605] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   29.892860] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0
[   29.900118] R10: 0000000020000240 R11: 0000000000000246 R12: 0000000000000001
[   29.907369] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   29.915249] Dumping ftrace buffer:
[   29.918913]    (ftrace buffer empty)
[   29.922607] Kernel Offset: disabled
[   29.926224] Rebooting in 86400 seconds..