[....] 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..