[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.542780] random: sshd: uninitialized urandom read (32 bytes read)
[   20.673843] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   20.953540] random: sshd: uninitialized urandom read (32 bytes read)
[   21.779007] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   21.940898] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts.
[   27.536970] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   27.645070] WARNING: CPU: 0 PID: 4538 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0
[   27.653457] Kernel panic - not syncing: panic_on_warn set ...
[   27.653457] 
[   27.660802] CPU: 0 PID: 4538 Comm: syz-executor761 Not tainted 4.17.0+ #84
[   27.667787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.677118] Call Trace:
[   27.679699]  dump_stack+0x1b9/0x294
[   27.683321]  ? dump_stack_print_info.cold.2+0x52/0x52
[   27.688493]  ? smc_unhash_sk+0x290/0x4a0
[   27.692535]  panic+0x22f/0x4de
[   27.695716]  ? add_taint.cold.5+0x16/0x16
[   27.699846]  ? __warn.cold.8+0x148/0x1b3
[   27.703884]  ? __warn.cold.8+0x117/0x1b3
[   27.707937]  ? smc_unhash_sk+0x345/0x4a0
[   27.711978]  __warn.cold.8+0x163/0x1b3
[   27.715852]  ? smc_unhash_sk+0x345/0x4a0
[   27.719891]  report_bug+0x252/0x2d0
[   27.723501]  do_error_trap+0x1fc/0x4d0
[   27.727369]  ? math_error+0x3f0/0x3f0
[   27.731152]  ? print_usage_bug+0xc0/0xc0
[   27.735195]  ? lock_acquire+0x1dc/0x520
[   27.739170]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   27.743998]  do_invalid_op+0x1b/0x20
[   27.747695]  invalid_op+0x14/0x20
[   27.751130] RIP: 0010:smc_unhash_sk+0x345/0x4a0
[   27.755771] Code: 00 49 c7 44 24 08 00 00 00 00 41 c7 44 24 10 00 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 db 40 29 fa <0f> 0b e9 51 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 a5 6a 66 fa 
[   27.774947] RSP: 0018:ffff8801abfef480 EFLAGS: 00010293
[   27.780290] RAX: ffff8801ac3ba3c0 RBX: ffff8801ac289800 RCX: ffffffff8750fbfe
[   27.787536] RDX: 0000000000000000 RSI: ffffffff8750fcb5 RDI: 0000000000000005
[   27.794787] RBP: ffff8801abfef568 R08: ffff8801ac3ba3c0 R09: ffffed0035851310
[   27.802038] R10: ffffed0035851310 R11: ffff8801ac289883 R12: 1ffff100357fde94
[   27.809297] R13: ffff8801abfef540 R14: ffffffff8992d600 R15: ffff8801ac289880
[   27.816555]  ? smc_unhash_sk+0x28e/0x4a0
[   27.820595]  ? smc_unhash_sk+0x345/0x4a0
[   27.824642]  ? smc_rx_data_available+0x100/0x100
[   27.829380]  ? release_sock+0x1e2/0x2b0
[   27.833335]  ? __local_bh_enable_ip+0x161/0x230
[   27.837985]  ? __release_sock+0x3a0/0x3a0
[   27.842135]  ? smc_release+0x269/0x610
[   27.846040]  ? trace_hardirqs_on+0xd/0x10
[   27.850172]  ? __local_bh_enable_ip+0x161/0x230
[   27.854825]  smc_release+0x36e/0x610
[   27.858521]  __sock_release+0xd7/0x260
[   27.862388]  ? __sock_release+0x260/0x260
[   27.866514]  sock_close+0x19/0x20
[   27.869957]  __fput+0x353/0x890
[   27.873222]  ? fput+0x1a0/0x1a0
[   27.876484]  ? _raw_spin_unlock_irq+0x27/0x70
[   27.880958]  ____fput+0x15/0x20
[   27.884224]  task_work_run+0x1e4/0x290
[   27.888094]  ? task_work_cancel+0x240/0x240
[   27.892407]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   27.897927]  ? switch_task_namespaces+0xa2/0xd0
[   27.902663]  do_exit+0x1aee/0x2730
[   27.906187]  ? mm_update_next_owner+0x980/0x980
[   27.910836]  ? lock_downgrade+0x8e0/0x8e0
[   27.914963]  ? noop_count+0x40/0x40
[   27.918571]  ? lock_pin_lock+0x350/0x350
[   27.922615]  ? kasan_check_read+0x11/0x20
[   27.926753]  ? rcu_is_watching+0x85/0x140
[   27.930882]  ? rcu_report_qs_rnp+0x790/0x790
[   27.935276]  ? is_bpf_text_address+0xd7/0x170
[   27.939754]  ? check_usage_backwards+0x151/0x3a0
[   27.944500]  ? graph_lock+0x170/0x170
[   27.948281]  ? graph_lock+0x170/0x170
[   27.952075]  ? find_held_lock+0x36/0x1c0
[   27.956124]  ? lock_downgrade+0x8e0/0x8e0
[   27.960258]  ? kasan_check_read+0x11/0x20
[   27.964388]  ? do_raw_spin_unlock+0x9e/0x2e0
[   27.968779]  ? __local_bh_enable_ip+0x161/0x230
[   27.973435]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   27.978432]  ? release_sock+0x1e2/0x2b0
[   27.982400]  ? trace_hardirqs_on+0xd/0x10
[   27.986529]  ? __local_bh_enable_ip+0x161/0x230
[   27.991181]  ? _raw_spin_unlock_bh+0x30/0x40
[   27.995572]  ? release_sock+0x1e2/0x2b0
[   27.999527]  ? __release_sock+0x3a0/0x3a0
[   28.003656]  ? __local_bh_enable_ip+0x161/0x230
[   28.008308]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   28.013490]  ? smc_setsockopt+0x388/0x6e0
[   28.017622]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   28.023140]  ? __sys_setsockopt+0x24f/0x390
[   28.027445]  do_group_exit+0x16f/0x430
[   28.031315]  ? mm_fault_error+0x380/0x380
[   28.035456]  ? __ia32_sys_exit+0x50/0x50
[   28.039501]  ? do_syscall_64+0x92/0x800
[   28.043458]  __x64_sys_exit_group+0x3e/0x50
[   28.047761]  do_syscall_64+0x1b1/0x800
[   28.051628]  ? syscall_return_slowpath+0x5c0/0x5c0
[   28.056538]  ? syscall_return_slowpath+0x30f/0x5c0
[   28.061453]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   28.066815]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.071640]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   28.076816] RIP: 0033:0x43e8d8
[   28.079991] Code: Bad RIP value.
[   28.083353] RSP: 002b:00007fff43b0e3a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   28.091044] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8
[   28.098294] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   28.105543] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0
[   28.112807] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001
[   28.120055] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000
[   28.127979] Dumping ftrace buffer:
[   28.131604]    (ftrace buffer empty)
[   28.135313] Kernel Offset: disabled
[   28.138921] Rebooting in 86400 seconds..