[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.579656] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.910696] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.306126] random: sshd: uninitialized urandom read (32 bytes read) [ 24.149239] random: sshd: uninitialized urandom read (32 bytes read) [ 24.318239] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 29.787645] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.890886] WARNING: CPU: 1 PID: 4537 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.899330] Kernel panic - not syncing: panic_on_warn set ... [ 29.899330] [ 29.906704] CPU: 1 PID: 4537 Comm: syz-executor070 Not tainted 4.17.0-rc6+ #61 [ 29.914159] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.923516] Call Trace: [ 29.926125] dump_stack+0x1b9/0x294 [ 29.929759] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.934961] ? smc_unhash_sk+0x310/0x4a0 [ 29.939030] panic+0x22f/0x4de [ 29.942227] ? add_taint.cold.5+0x16/0x16 [ 29.946383] ? __warn.cold.8+0x148/0x1b3 [ 29.950450] ? __warn.cold.8+0x117/0x1b3 [ 29.954523] ? smc_unhash_sk+0x345/0x4a0 [ 29.958603] __warn.cold.8+0x163/0x1b3 [ 29.962519] ? smc_unhash_sk+0x345/0x4a0 [ 29.966600] report_bug+0x252/0x2d0 [ 29.970237] do_error_trap+0x1de/0x490 [ 29.974127] ? graph_lock+0x170/0x170 [ 29.977929] ? math_error+0x420/0x420 [ 29.981728] ? lock_acquire+0x1dc/0x520 [ 29.985711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.990553] do_invalid_op+0x1b/0x20 [ 29.994282] invalid_op+0x14/0x20 [ 29.997730] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.002383] RSP: 0018:ffff8801d97af488 EFLAGS: 00010293 [ 30.007739] RAX: ffff8801af0f82c0 RBX: ffff8801d8d347c0 RCX: ffffffff8742137e [ 30.015009] RDX: 0000000000000000 RSI: ffffffff87421435 RDI: 0000000000000005 [ 30.022285] RBP: ffff8801d97af570 R08: ffff8801af0f82c0 R09: ffffed003b1a6908 [ 30.029555] R10: ffffed003b1a6908 R11: ffff8801d8d34843 R12: 1ffff1003b2f5e95 [ 30.036819] R13: ffff8801d97af548 R14: ffffffff8970e2a0 R15: ffff8801d8d34840 [ 30.044097] ? smc_unhash_sk+0x28e/0x4a0 [ 30.048146] ? smc_unhash_sk+0x345/0x4a0 [ 30.052203] ? smc_unhash_sk+0x345/0x4a0 [ 30.056255] ? smc_rx_data_available+0x100/0x100 [ 30.060995] ? release_sock+0x1e2/0x2b0 [ 30.064965] ? __local_bh_enable_ip+0x161/0x230 [ 30.069619] ? __release_sock+0x3a0/0x3a0 [ 30.073752] ? smc_release+0x269/0x610 [ 30.077631] ? trace_hardirqs_on+0xd/0x10 [ 30.081765] ? __local_bh_enable_ip+0x161/0x230 [ 30.086425] smc_release+0x36e/0x610 [ 30.090137] sock_release+0x96/0x1b0 [ 30.093837] ? sock_alloc_file+0x4e0/0x4e0 [ 30.098073] sock_close+0x16/0x20 [ 30.101537] __fput+0x34d/0x890 [ 30.104806] ? fput+0x1a0/0x1a0 [ 30.108077] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.112560] ____fput+0x15/0x20 [ 30.115837] task_work_run+0x1e4/0x290 [ 30.119724] ? task_work_cancel+0x240/0x240 [ 30.124130] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.129660] ? switch_task_namespaces+0xa2/0xd0 [ 30.134329] do_exit+0x1aee/0x2730 [ 30.137880] ? mm_update_next_owner+0x980/0x980 [ 30.142538] ? kasan_check_read+0x11/0x20 [ 30.146850] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.151254] ? __local_bh_enable_ip+0x161/0x230 [ 30.155915] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.160924] ? release_sock+0x1e2/0x2b0 [ 30.164888] ? trace_hardirqs_on+0xd/0x10 [ 30.169032] ? __local_bh_enable_ip+0x161/0x230 [ 30.173695] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.178096] ? kasan_check_read+0x11/0x20 [ 30.182236] ? rcu_is_watching+0x85/0x140 [ 30.186371] ? rcu_pm_notify+0xc0/0xc0 [ 30.190250] ? ___sys_sendmsg+0x31a/0x940 [ 30.194392] ? kfree+0x1e9/0x260 [ 30.197743] ? ___sys_sendmsg+0x31f/0x940 [ 30.201877] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.207417] ? __handle_mm_fault+0x93a/0x4310 [ 30.211905] ? copy_msghdr_from_user+0x560/0x560 [ 30.216649] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.221392] ? graph_lock+0x170/0x170 [ 30.225188] ? fget_raw+0x20/0x20 [ 30.228648] ? find_held_lock+0x36/0x1c0 [ 30.232707] ? lock_downgrade+0x8e0/0x8e0 [ 30.236859] ? handle_mm_fault+0x8c0/0xc70 [ 30.241089] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.246611] ? sockfd_lookup_light+0xc5/0x160 [ 30.251095] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.256618] ? __sys_sendmsg+0x1aa/0x270 [ 30.260661] ? __ia32_sys_shutdown+0x80/0x80 [ 30.265072] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.270595] ? __do_page_fault+0x441/0xe40 [ 30.274817] do_group_exit+0x16f/0x430 [ 30.278691] ? __ia32_sys_exit+0x50/0x50 [ 30.282745] ? do_syscall_64+0x92/0x800 [ 30.286708] __x64_sys_exit_group+0x3e/0x50 [ 30.291028] do_syscall_64+0x1b1/0x800 [ 30.294911] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.299741] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.304660] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.309581] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.314935] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.319767] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.324943] RIP: 0033:0x43e9b8 [ 30.328116] RSP: 002b:00007fff8a5056d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.335827] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9b8 [ 30.343081] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.350336] RBP: 00000000004be360 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.357601] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 30.364859] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.372844] Dumping ftrace buffer: [ 30.376509] (ftrace buffer empty) [ 30.380209] Kernel Offset: disabled [ 30.383824] Rebooting in 86400 seconds..