[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.144653] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.321473] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.739193] random: sshd: uninitialized urandom read (32 bytes read) [ 22.476914] random: sshd: uninitialized urandom read (32 bytes read) [ 22.637403] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 28.111969] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.203581] WARNING: CPU: 0 PID: 4501 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.211978] Kernel panic - not syncing: panic_on_warn set ... [ 28.211978] [ 28.219330] CPU: 0 PID: 4501 Comm: syz-executor949 Not tainted 4.17.0-rc3+ #37 [ 28.226666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.235998] Call Trace: [ 28.238575] dump_stack+0x1b9/0x294 [ 28.242183] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.247358] ? smc_unhash_sk+0x320/0x4a0 [ 28.251399] panic+0x22f/0x4de [ 28.254572] ? add_taint.cold.5+0x16/0x16 [ 28.258703] ? __warn.cold.8+0x148/0x1b3 [ 28.262742] ? __warn.cold.8+0x117/0x1b3 [ 28.266783] ? smc_unhash_sk+0x345/0x4a0 [ 28.270828] __warn.cold.8+0x163/0x1b3 [ 28.274696] ? smc_unhash_sk+0x345/0x4a0 [ 28.278737] report_bug+0x252/0x2d0 [ 28.282386] do_error_trap+0x1de/0x490 [ 28.286255] ? graph_lock+0x170/0x170 [ 28.290044] ? math_error+0x420/0x420 [ 28.293836] ? lock_acquire+0x1dc/0x520 [ 28.297797] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.302620] do_invalid_op+0x1b/0x20 [ 28.306313] invalid_op+0x14/0x20 [ 28.309746] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.314391] RSP: 0018:ffff8801ab4a7488 EFLAGS: 00010293 [ 28.319735] RAX: ffff8801d906a680 RBX: ffff8801ab5da7c0 RCX: ffffffff873f756e [ 28.326985] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 28.334237] RBP: ffff8801ab4a7570 R08: ffff8801d906a680 R09: ffffed00356bb508 [ 28.341486] R10: ffffed00356bb508 R11: ffff8801ab5da843 R12: 1ffff10035694e95 [ 28.348736] R13: ffff8801ab4a7548 R14: ffffffff8970b1e0 R15: ffff8801ab5da840 [ 28.356002] ? smc_unhash_sk+0x28e/0x4a0 [ 28.360052] ? smc_unhash_sk+0x345/0x4a0 [ 28.364096] ? smc_unhash_sk+0x345/0x4a0 [ 28.368138] ? smc_rx_data_available+0x100/0x100 [ 28.373042] ? release_sock+0x1e2/0x2b0 [ 28.377029] ? __local_bh_enable_ip+0x161/0x230 [ 28.381685] ? __release_sock+0x3a0/0x3a0 [ 28.385814] ? smc_release+0x269/0x610 [ 28.389683] ? trace_hardirqs_on+0xd/0x10 [ 28.393831] ? __local_bh_enable_ip+0x161/0x230 [ 28.398489] smc_release+0x36e/0x610 [ 28.402190] sock_release+0x96/0x1b0 [ 28.405884] ? sock_alloc_file+0x4e0/0x4e0 [ 28.410100] sock_close+0x16/0x20 [ 28.413544] __fput+0x34d/0x890 [ 28.416816] ? fput+0x1a0/0x1a0 [ 28.420078] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.424566] ____fput+0x15/0x20 [ 28.427827] task_work_run+0x1e4/0x290 [ 28.431702] ? task_work_cancel+0x240/0x240 [ 28.436009] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.441535] ? switch_task_namespaces+0xa2/0xd0 [ 28.446185] do_exit+0x1aee/0x2730 [ 28.449708] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.454103] ? mm_update_next_owner+0x980/0x980 [ 28.458759] ? ___sys_sendmsg+0x31a/0x940 [ 28.462898] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.467895] ? kfree+0x1e9/0x260 [ 28.471244] ? ___sys_sendmsg+0x31f/0x940 [ 28.475375] ? copy_msghdr_from_user+0x560/0x560 [ 28.480113] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.485108] ? graph_lock+0x170/0x170 [ 28.488892] ? pud_val+0x80/0xf0 [ 28.492246] ? __handle_mm_fault+0x93a/0x4310 [ 28.496725] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 28.501459] ? graph_lock+0x170/0x170 [ 28.505253] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.510778] ? sockfd_lookup_light+0xc5/0x160 [ 28.515259] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.520780] ? __sys_sendmmsg+0x4b3/0x6f0 [ 28.524913] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 28.529218] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.534742] ? __handle_mm_fault+0x4310/0x4310 [ 28.539314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.544832] ? __do_page_fault+0x441/0xe40 [ 28.549054] do_group_exit+0x16f/0x430 [ 28.552925] ? mm_fault_error+0x380/0x380 [ 28.557055] ? __ia32_sys_exit+0x50/0x50 [ 28.561111] ? do_syscall_64+0x92/0x800 [ 28.565067] __x64_sys_exit_group+0x3e/0x50 [ 28.569371] do_syscall_64+0x1b1/0x800 [ 28.573242] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 28.578072] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.582984] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.587898] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.593249] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.598088] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.603257] RIP: 0033:0x43f108 [ 28.606427] RSP: 002b:00007fffba792d08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.614117] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f108 [ 28.621366] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.628616] RBP: 00000000004beaa0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.635865] R10: 0000000024000005 R11: 0000000000000246 R12: 0000000000000001 [ 28.643115] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.650975] Dumping ftrace buffer: [ 28.654602] (ftrace buffer empty) [ 28.658294] Kernel Offset: disabled [ 28.661902] Rebooting in 86400 seconds..