[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.422543] random: sshd: uninitialized urandom read (32 bytes read)
[   19.499849] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   19.846983] random: sshd: uninitialized urandom read (32 bytes read)
[   20.683912] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   21.822265] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.24' (ECDSA) to the list of known hosts.
[   27.342210] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   27.437169] WARNING: CPU: 0 PID: 4548 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0
[   27.445571] Kernel panic - not syncing: panic_on_warn set ...
[   27.445571] 
[   27.452920] CPU: 0 PID: 4548 Comm: syz-executor811 Not tainted 4.18.0-rc4+ #147
[   27.460347] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.469679] Call Trace:
[   27.472251]  dump_stack+0x1c9/0x2b4
[   27.475861]  ? dump_stack_print_info.cold.2+0x52/0x52
[   27.481052]  panic+0x238/0x4e7
[   27.484229]  ? add_taint.cold.5+0x16/0x16
[   27.488364]  ? __warn.cold.8+0x148/0x1ba
[   27.492405]  ? __warn.cold.8+0x117/0x1ba
[   27.496450]  ? smc_unhash_sk+0x357/0x4b0
[   27.500502]  __warn.cold.8+0x163/0x1ba
[   27.504373]  ? smc_unhash_sk+0x357/0x4b0
[   27.508417]  report_bug+0x252/0x2d0
[   27.512038]  do_error_trap+0x1fc/0x4d0
[   27.515911]  ? math_error+0x3e0/0x3e0
[   27.519696]  ? print_usage_bug+0xc0/0xc0
[   27.523749]  ? lock_acquire+0x1e4/0x540
[   27.527714]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   27.532539]  do_invalid_op+0x1b/0x20
[   27.536233]  invalid_op+0x14/0x20
[   27.539671] RIP: 0010:smc_unhash_sk+0x357/0x4b0
[   27.544318] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 89 42 1a fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 73 21 58 fa 
[   27.563492] RSP: 0018:ffff8801af747480 EFLAGS: 00010293
[   27.568838] RAX: ffff8801ae1e40c0 RBX: ffff8801ace570c0 RCX: ffffffff8761c7f6
[   27.576091] RDX: 0000000000000000 RSI: ffffffff8761c8b7 RDI: 0000000000000005
[   27.583343] RBP: ffff8801af747568 R08: ffff8801ae1e40c0 R09: ffffed00359cae28
[   27.590596] R10: ffffed00359cae28 R11: ffff8801ace57143 R12: 1ffff10035ee8e94
[   27.597851] R13: ffff8801af747540 R14: ffffffff899373c0 R15: ffff8801ace57140
[   27.605120]  ? smc_unhash_sk+0x296/0x4b0
[   27.609167]  ? smc_unhash_sk+0x357/0x4b0
[   27.613215]  ? smc_rx_data_available+0x120/0x120
[   27.617951]  ? release_sock+0x1ec/0x2c0
[   27.621906]  ? __local_bh_enable_ip+0x161/0x230
[   27.626557]  ? __release_sock+0x3a0/0x3a0
[   27.630687]  ? smc_release+0x2c9/0x670
[   27.634556]  ? trace_hardirqs_on+0xd/0x10
[   27.638686]  ? __local_bh_enable_ip+0x161/0x230
[   27.643343]  smc_release+0x3cf/0x670
[   27.647052]  __sock_release+0xd7/0x260
[   27.650926]  ? __sock_release+0x260/0x260
[   27.655065]  sock_close+0x19/0x20
[   27.658502]  __fput+0x355/0x8b0
[   27.661764]  ? fput+0x1a0/0x1a0
[   27.665045]  ? _raw_spin_unlock_irq+0x27/0x70
[   27.669526]  ____fput+0x15/0x20
[   27.672787]  task_work_run+0x1ec/0x2a0
[   27.676655]  ? task_work_cancel+0x250/0x250
[   27.680958]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   27.686476]  ? switch_task_namespaces+0xa2/0xd0
[   27.691135]  do_exit+0x1b08/0x2750
[   27.694659]  ? lock_downgrade+0x8d1/0x8f0
[   27.698785]  ? mm_update_next_owner+0x9a0/0x9a0
[   27.703438]  ? kasan_check_read+0x11/0x20
[   27.707572]  ? do_raw_spin_unlock+0xa7/0x2f0
[   27.711960]  ? __local_bh_enable_ip+0x161/0x230
[   27.716624]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   27.721635]  ? release_sock+0x1ec/0x2c0
[   27.725591]  ? trace_hardirqs_on+0xd/0x10
[   27.729720]  ? __local_bh_enable_ip+0x161/0x230
[   27.734463]  ? _raw_spin_unlock_bh+0x30/0x40
[   27.738852]  ? kasan_check_read+0x11/0x20
[   27.742978]  ? rcu_is_watching+0x8c/0x150
[   27.747106]  ? rcu_pm_notify+0xc0/0xc0
[   27.750980]  ? ___sys_sendmsg+0x313/0x930
[   27.755111]  ? rcu_read_lock_sched_held+0x108/0x120
[   27.760119]  ? kfree+0x1e9/0x260
[   27.763473]  ? ___sys_sendmsg+0x318/0x930
[   27.767610]  ? graph_lock+0x170/0x170
[   27.771404]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   27.776923]  ? __fget_light+0x2f7/0x440
[   27.780888]  ? fget_raw+0x20/0x20
[   27.784330]  ? lock_downgrade+0x8f0/0x8f0
[   27.788469]  ? handle_mm_fault+0x8c4/0xc80
[   27.792691]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   27.798209]  ? sockfd_lookup_light+0xc5/0x160
[   27.802688]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   27.808205]  ? __sys_sendmsg+0x1ba/0x290
[   27.812249]  ? __ia32_sys_shutdown+0x80/0x80
[   27.816641]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   27.822162]  ? __do_page_fault+0x449/0xe50
[   27.826399]  do_group_exit+0x177/0x440
[   27.830270]  ? __ia32_sys_exit+0x50/0x50
[   27.834324]  ? security_file_fcntl+0x94/0xc0
[   27.838715]  ? do_syscall_64+0x9a/0x820
[   27.842671]  __x64_sys_exit_group+0x3e/0x50
[   27.846976]  do_syscall_64+0x1b9/0x820
[   27.850845]  ? syscall_slow_exit_work+0x500/0x500
[   27.855672]  ? syscall_return_slowpath+0x5e0/0x5e0
[   27.860582]  ? syscall_return_slowpath+0x31d/0x5e0
[   27.865500]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   27.870849]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   27.875680]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   27.880865] RIP: 0033:0x43edb8
[   27.884040] Code: Bad RIP value.
[   27.887410] RSP: 002b:00007fff6b975948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   27.895108] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edb8
[   27.902361] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   27.909613] RBP: 00000000004be668 R08: 00000000000000e7 R09: ffffffffffffffd0
[   27.916878] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001
[   27.924130] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000
[   27.932090] Dumping ftrace buffer:
[   27.935753]    (ftrace buffer empty)
[   27.939443] Kernel Offset: disabled
[   27.943071] Rebooting in 86400 seconds..