[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.197781] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.512410] random: sshd: uninitialized urandom read (32 bytes read) [ 23.924977] random: sshd: uninitialized urandom read (32 bytes read) [ 24.674633] random: sshd: uninitialized urandom read (32 bytes read) [ 24.834466] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.54' (ECDSA) to the list of known hosts. [ 30.249551] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.355084] WARNING: CPU: 1 PID: 4519 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.363508] Kernel panic - not syncing: panic_on_warn set ... [ 30.363508] [ 30.370857] CPU: 1 PID: 4519 Comm: syz-executor487 Not tainted 4.17.0-rc6+ #59 [ 30.378193] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.387522] Call Trace: [ 30.390098] dump_stack+0x1b9/0x294 [ 30.393707] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.398877] ? smc_unhash_sk+0x270/0x4a0 [ 30.402923] panic+0x22f/0x4de [ 30.406104] ? add_taint.cold.5+0x16/0x16 [ 30.410239] ? __warn.cold.8+0x148/0x1b3 [ 30.414283] ? __warn.cold.8+0x117/0x1b3 [ 30.418329] ? smc_unhash_sk+0x345/0x4a0 [ 30.422374] __warn.cold.8+0x163/0x1b3 [ 30.426245] ? smc_unhash_sk+0x345/0x4a0 [ 30.430289] report_bug+0x252/0x2d0 [ 30.433909] do_error_trap+0x1de/0x490 [ 30.437787] ? graph_lock+0x170/0x170 [ 30.441587] ? math_error+0x420/0x420 [ 30.445374] ? lock_acquire+0x1dc/0x520 [ 30.449329] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.454150] do_invalid_op+0x1b/0x20 [ 30.457842] invalid_op+0x14/0x20 [ 30.461274] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.465916] RSP: 0018:ffff8801afb3f488 EFLAGS: 00010293 [ 30.471257] RAX: ffff8801ac468580 RBX: ffff8801acf3c7c0 RCX: ffffffff8741441e [ 30.478504] RDX: 0000000000000000 RSI: ffffffff874144d5 RDI: 0000000000000005 [ 30.485748] RBP: ffff8801afb3f570 R08: ffff8801ac468580 R09: ffffed00359e7908 [ 30.492996] R10: ffffed00359e7908 R11: ffff8801acf3c843 R12: 1ffff10035f67e95 [ 30.500246] R13: ffff8801afb3f548 R14: ffffffff8970da60 R15: ffff8801acf3c840 [ 30.507505] ? smc_unhash_sk+0x28e/0x4a0 [ 30.511547] ? smc_unhash_sk+0x345/0x4a0 [ 30.515586] ? smc_unhash_sk+0x345/0x4a0 [ 30.519625] ? smc_rx_data_available+0x100/0x100 [ 30.524358] ? release_sock+0x1e2/0x2b0 [ 30.528311] ? __local_bh_enable_ip+0x161/0x230 [ 30.532960] ? __release_sock+0x3a0/0x3a0 [ 30.537088] ? smc_release+0x269/0x610 [ 30.540955] ? trace_hardirqs_on+0xd/0x10 [ 30.545080] ? __local_bh_enable_ip+0x161/0x230 [ 30.549726] smc_release+0x36e/0x610 [ 30.553419] sock_release+0x96/0x1b0 [ 30.557109] ? sock_alloc_file+0x4e0/0x4e0 [ 30.561321] sock_close+0x16/0x20 [ 30.564756] __fput+0x34d/0x890 [ 30.568018] ? fput+0x1a0/0x1a0 [ 30.571280] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.575756] ____fput+0x15/0x20 [ 30.579015] task_work_run+0x1e4/0x290 [ 30.582891] ? task_work_cancel+0x240/0x240 [ 30.587194] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.592709] ? switch_task_namespaces+0xa2/0xd0 [ 30.597358] do_exit+0x1aee/0x2730 [ 30.600879] ? mm_update_next_owner+0x980/0x980 [ 30.605535] ? lock_downgrade+0x8e0/0x8e0 [ 30.609662] ? noop_count+0x40/0x40 [ 30.613266] ? lock_pin_lock+0x350/0x350 [ 30.617305] ? kasan_check_read+0x11/0x20 [ 30.621428] ? rcu_is_watching+0x85/0x140 [ 30.625554] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 30.630725] ? is_bpf_text_address+0xd7/0x170 [ 30.635197] ? check_usage_backwards+0x151/0x3a0 [ 30.639931] ? graph_lock+0x170/0x170 [ 30.643709] ? graph_lock+0x170/0x170 [ 30.647490] ? find_held_lock+0x36/0x1c0 [ 30.651535] ? lock_downgrade+0x8e0/0x8e0 [ 30.655662] ? kasan_check_read+0x11/0x20 [ 30.659789] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.664175] ? __local_bh_enable_ip+0x161/0x230 [ 30.668821] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.673814] ? release_sock+0x1e2/0x2b0 [ 30.677767] ? trace_hardirqs_on+0xd/0x10 [ 30.681892] ? __local_bh_enable_ip+0x161/0x230 [ 30.686541] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.690928] ? release_sock+0x1e2/0x2b0 [ 30.694883] ? __release_sock+0x3a0/0x3a0 [ 30.699011] ? __local_bh_enable_ip+0x161/0x230 [ 30.703660] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.708831] ? smc_setsockopt+0x1ed/0x6d0 [ 30.712963] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.718481] ? __sys_setsockopt+0x24f/0x390 [ 30.722792] do_group_exit+0x16f/0x430 [ 30.726658] ? mm_fault_error+0x380/0x380 [ 30.730783] ? __ia32_sys_exit+0x50/0x50 [ 30.734825] ? do_syscall_64+0x92/0x800 [ 30.738777] __x64_sys_exit_group+0x3e/0x50 [ 30.743075] do_syscall_64+0x1b1/0x800 [ 30.746944] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.751862] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.756773] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.762119] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.766946] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.772114] RIP: 0033:0x43e8d8 [ 30.775281] RSP: 002b:00007ffff6a54cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.782968] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 30.790214] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.797458] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.804715] R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000001 [ 30.811963] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.819729] Dumping ftrace buffer: [ 30.823324] (ftrace buffer empty) [ 30.827014] Kernel Offset: disabled [ 30.830621] Rebooting in 86400 seconds..