[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.774374] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.518301] random: sshd: uninitialized urandom read (32 bytes read) [ 23.996251] random: sshd: uninitialized urandom read (32 bytes read) [ 24.755247] random: sshd: uninitialized urandom read (32 bytes read) [ 33.800660] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 39.217579] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.309605] WARNING: CPU: 0 PID: 4550 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 39.318839] Kernel panic - not syncing: panic_on_warn set ... [ 39.318839] [ 39.326198] CPU: 0 PID: 4550 Comm: syz-executor179 Not tainted 4.17.0-rc6+ #61 [ 39.333568] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.342901] Call Trace: [ 39.345494] dump_stack+0x1b9/0x294 [ 39.349103] ? dump_stack_print_info.cold.2+0x52/0x52 [ 39.354281] ? smc_unhash_sk+0x310/0x4a0 [ 39.358325] panic+0x22f/0x4de [ 39.361497] ? add_taint.cold.5+0x16/0x16 [ 39.365627] ? __warn.cold.8+0x148/0x1b3 [ 39.369668] ? __warn.cold.8+0x117/0x1b3 [ 39.373722] ? smc_unhash_sk+0x345/0x4a0 [ 39.377762] __warn.cold.8+0x163/0x1b3 [ 39.381629] ? smc_unhash_sk+0x345/0x4a0 [ 39.385674] report_bug+0x252/0x2d0 [ 39.389290] do_error_trap+0x1de/0x490 [ 39.393168] ? graph_lock+0x170/0x170 [ 39.396956] ? math_error+0x420/0x420 [ 39.400741] ? lock_acquire+0x1dc/0x520 [ 39.405664] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.410501] do_invalid_op+0x1b/0x20 [ 39.414198] invalid_op+0x14/0x20 [ 39.417651] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 39.422310] RSP: 0018:ffff8801cf1ff488 EFLAGS: 00010293 [ 39.427656] RAX: ffff8801ac818540 RBX: ffff8801ace817c0 RCX: ffffffff8742137e [ 39.434909] RDX: 0000000000000000 RSI: ffffffff87421435 RDI: 0000000000000005 [ 39.442166] RBP: ffff8801cf1ff570 R08: ffff8801ac818540 R09: ffffed00359d0308 [ 39.449514] R10: ffffed00359d0308 R11: ffff8801ace81843 R12: 1ffff10039e3fe95 [ 39.456768] R13: ffff8801cf1ff548 R14: ffffffff8970e2a0 R15: ffff8801ace81840 [ 39.464050] ? smc_unhash_sk+0x28e/0x4a0 [ 39.468190] ? smc_unhash_sk+0x345/0x4a0 [ 39.472235] ? smc_unhash_sk+0x345/0x4a0 [ 39.476293] ? smc_rx_data_available+0x100/0x100 [ 39.481035] ? release_sock+0x1e2/0x2b0 [ 39.484994] ? __local_bh_enable_ip+0x161/0x230 [ 39.489653] ? __release_sock+0x3a0/0x3a0 [ 39.493781] ? smc_release+0x269/0x610 [ 39.497648] ? trace_hardirqs_on+0xd/0x10 [ 39.501778] ? __local_bh_enable_ip+0x161/0x230 [ 39.506459] smc_release+0x36e/0x610 [ 39.510158] sock_release+0x96/0x1b0 [ 39.513855] ? sock_alloc_file+0x4e0/0x4e0 [ 39.518074] sock_close+0x16/0x20 [ 39.521518] __fput+0x34d/0x890 [ 39.524804] ? fput+0x1a0/0x1a0 [ 39.528069] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.532550] ____fput+0x15/0x20 [ 39.535828] task_work_run+0x1e4/0x290 [ 39.539696] ? task_work_cancel+0x240/0x240 [ 39.544032] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 39.549552] ? switch_task_namespaces+0xa2/0xd0 [ 39.554222] do_exit+0x1aee/0x2730 [ 39.557749] ? mm_update_next_owner+0x980/0x980 [ 39.562489] ? kasan_check_read+0x11/0x20 [ 39.566623] ? do_raw_spin_unlock+0x9e/0x2e0 [ 39.571017] ? __local_bh_enable_ip+0x161/0x230 [ 39.575669] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.580669] ? release_sock+0x1e2/0x2b0 [ 39.584635] ? trace_hardirqs_on+0xd/0x10 [ 39.588762] ? __local_bh_enable_ip+0x161/0x230 [ 39.593415] ? _raw_spin_unlock_bh+0x30/0x40 [ 39.597820] ? kasan_check_read+0x11/0x20 [ 39.601949] ? rcu_is_watching+0x85/0x140 [ 39.606077] ? rcu_pm_notify+0xc0/0xc0 [ 39.609950] ? ___sys_sendmsg+0x31a/0x940 [ 39.614080] ? kfree+0x1e9/0x260 [ 39.617427] ? ___sys_sendmsg+0x31f/0x940 [ 39.621557] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.627074] ? copy_msghdr_from_user+0x560/0x560 [ 39.631812] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 39.636546] ? graph_lock+0x170/0x170 [ 39.640333] ? __fget_light+0x2ef/0x430 [ 39.644312] ? find_held_lock+0x36/0x1c0 [ 39.648363] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.653885] ? sockfd_lookup_light+0xc5/0x160 [ 39.658385] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.663904] ? __sys_sendmsg+0x1aa/0x270 [ 39.667947] ? __ia32_sys_shutdown+0x80/0x80 [ 39.672344] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.677860] ? __do_page_fault+0x441/0xe40 [ 39.682077] do_group_exit+0x16f/0x430 [ 39.685946] ? __ia32_sys_exit+0x50/0x50 [ 39.689990] ? do_syscall_64+0x92/0x800 [ 39.693953] __x64_sys_exit_group+0x3e/0x50 [ 39.698267] do_syscall_64+0x1b1/0x800 [ 39.702149] ? syscall_return_slowpath+0x5c0/0x5c0 [ 39.707065] ? syscall_return_slowpath+0x30f/0x5c0 [ 39.711980] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 39.717328] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.722156] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.727379] RIP: 0033:0x43ea78 [ 39.730549] RSP: 002b:00007fffcb7cb128 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 39.738241] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea78 [ 39.745491] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 39.752742] RBP: 00000000004be420 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 39.759997] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 39.767268] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 39.775144] Dumping ftrace buffer: [ 39.778830] (ftrace buffer empty) [ 39.782525] Kernel Offset: disabled [ 39.786140] Rebooting in 86400 seconds..