[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.809421] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.042303] random: sshd: uninitialized urandom read (32 bytes read) [ 22.310060] random: sshd: uninitialized urandom read (32 bytes read) [ 23.041562] random: sshd: uninitialized urandom read (32 bytes read) [ 23.198566] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 28.619343] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.712680] WARNING: CPU: 0 PID: 4540 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.721066] Kernel panic - not syncing: panic_on_warn set ... [ 28.721066] [ 28.728415] CPU: 0 PID: 4540 Comm: syz-executor223 Not tainted 4.17.0-rc4+ #53 [ 28.735751] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.745088] Call Trace: [ 28.747661] dump_stack+0x1b9/0x294 [ 28.751270] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.756447] ? smc_unhash_sk+0x260/0x4a0 [ 28.760494] panic+0x22f/0x4de [ 28.763670] ? add_taint.cold.5+0x16/0x16 [ 28.767803] ? __warn.cold.8+0x148/0x1b3 [ 28.771844] ? __warn.cold.8+0x117/0x1b3 [ 28.775900] ? smc_unhash_sk+0x345/0x4a0 [ 28.779943] __warn.cold.8+0x163/0x1b3 [ 28.783821] ? smc_unhash_sk+0x345/0x4a0 [ 28.787868] report_bug+0x252/0x2d0 [ 28.791481] do_error_trap+0x1de/0x490 [ 28.795348] ? graph_lock+0x170/0x170 [ 28.799135] ? math_error+0x420/0x420 [ 28.802927] ? lock_acquire+0x1dc/0x520 [ 28.806891] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.811717] do_invalid_op+0x1b/0x20 [ 28.815414] invalid_op+0x14/0x20 [ 28.818850] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.823495] RSP: 0018:ffff8801d91d7488 EFLAGS: 00010293 [ 28.828842] RAX: ffff8801ac486440 RBX: ffff8801d96597c0 RCX: ffffffff8740fb2e [ 28.836181] RDX: 0000000000000000 RSI: ffffffff8740fbe5 RDI: 0000000000000005 [ 28.843431] RBP: ffff8801d91d7570 R08: ffff8801ac486440 R09: ffffed003b2cb308 [ 28.850682] R10: ffffed003b2cb308 R11: ffff8801d9659843 R12: 1ffff1003b23ae95 [ 28.857933] R13: ffff8801d91d7548 R14: ffffffff8970dc60 R15: ffff8801d9659840 [ 28.865201] ? smc_unhash_sk+0x28e/0x4a0 [ 28.869241] ? smc_unhash_sk+0x345/0x4a0 [ 28.873303] ? smc_unhash_sk+0x345/0x4a0 [ 28.877357] ? smc_rx_data_available+0x100/0x100 [ 28.882098] ? release_sock+0x1e2/0x2b0 [ 28.886066] ? __local_bh_enable_ip+0x161/0x230 [ 28.890721] ? __release_sock+0x3a0/0x3a0 [ 28.894856] ? smc_release+0x269/0x610 [ 28.898738] ? trace_hardirqs_on+0xd/0x10 [ 28.902875] ? __local_bh_enable_ip+0x161/0x230 [ 28.907532] smc_release+0x36e/0x610 [ 28.911237] sock_release+0x96/0x1b0 [ 28.914934] ? sock_alloc_file+0x4e0/0x4e0 [ 28.919164] sock_close+0x16/0x20 [ 28.922609] __fput+0x34d/0x890 [ 28.925874] ? fput+0x1a0/0x1a0 [ 28.929139] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.933619] ____fput+0x15/0x20 [ 28.936885] task_work_run+0x1e4/0x290 [ 28.940758] ? task_work_cancel+0x240/0x240 [ 28.945066] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.950586] ? switch_task_namespaces+0xa2/0xd0 [ 28.955371] do_exit+0x1aee/0x2730 [ 28.958904] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.963304] ? mm_update_next_owner+0x980/0x980 [ 28.967969] ? ___sys_sendmsg+0x31a/0x940 [ 28.972108] ? rcu_read_lock_sched_held+0x108/0x120 [ 28.977109] ? kfree+0x1e9/0x260 [ 28.980458] ? ___sys_sendmsg+0x31f/0x940 [ 28.984590] ? copy_msghdr_from_user+0x560/0x560 [ 28.989329] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.994328] ? graph_lock+0x170/0x170 [ 28.998115] ? pud_val+0x80/0xf0 [ 29.001461] ? pmd_val+0xf0/0xf0 [ 29.004813] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.010336] ? __fget_light+0x2ef/0x430 [ 29.014291] ? __handle_mm_fault+0x93a/0x4310 [ 29.018771] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 29.023510] ? graph_lock+0x170/0x170 [ 29.027303] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.032838] ? sockfd_lookup_light+0xc5/0x160 [ 29.037321] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.042842] ? __sys_sendmmsg+0x4b3/0x6f0 [ 29.046981] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 29.051289] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.056814] ? __handle_mm_fault+0x4310/0x4310 [ 29.061382] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.066900] ? __do_page_fault+0x441/0xe40 [ 29.071125] do_group_exit+0x16f/0x430 [ 29.075019] ? mm_fault_error+0x380/0x380 [ 29.079159] ? __ia32_sys_exit+0x50/0x50 [ 29.083207] ? do_syscall_64+0x92/0x800 [ 29.087177] __x64_sys_exit_group+0x3e/0x50 [ 29.091493] do_syscall_64+0x1b1/0x800 [ 29.095364] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 29.100188] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.105116] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.110034] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.115382] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.120209] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.125400] RIP: 0033:0x43f2e8 [ 29.128572] RSP: 002b:00007ffc9504f6c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.136267] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f2e8 [ 29.143519] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.150777] RBP: 00000000004becc0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.158038] R10: 0000000020004081 R11: 0000000000000246 R12: 0000000000000001 [ 29.165286] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.173154] Dumping ftrace buffer: [ 29.176782] (ftrace buffer empty) [ 29.180472] Kernel Offset: disabled [ 29.184084] Rebooting in 86400 seconds..