[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.794875] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.607319] random: sshd: uninitialized urandom read (32 bytes read) [ 20.906898] random: sshd: uninitialized urandom read (32 bytes read) [ 21.650569] random: sshd: uninitialized urandom read (32 bytes read) [ 21.809769] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 27.264954] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.358700] WARNING: CPU: 0 PID: 4501 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.367103] Kernel panic - not syncing: panic_on_warn set ... [ 27.367103] [ 27.374450] CPU: 0 PID: 4501 Comm: syz-executor810 Not tainted 4.17.0-rc4+ #41 [ 27.381790] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.391123] Call Trace: [ 27.393699] dump_stack+0x1b9/0x294 [ 27.397409] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.402586] ? smc_unhash_sk+0x2d0/0x4a0 [ 27.406642] panic+0x22f/0x4de [ 27.409817] ? add_taint.cold.5+0x16/0x16 [ 27.413956] ? __warn.cold.8+0x148/0x1b3 [ 27.417996] ? __warn.cold.8+0x117/0x1b3 [ 27.422048] ? smc_unhash_sk+0x345/0x4a0 [ 27.426090] __warn.cold.8+0x163/0x1b3 [ 27.429958] ? smc_unhash_sk+0x345/0x4a0 [ 27.434000] report_bug+0x252/0x2d0 [ 27.437609] do_error_trap+0x1de/0x490 [ 27.441476] ? graph_lock+0x170/0x170 [ 27.445262] ? math_error+0x420/0x420 [ 27.449083] ? lock_acquire+0x1dc/0x520 [ 27.453067] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.457905] do_invalid_op+0x1b/0x20 [ 27.461603] invalid_op+0x14/0x20 [ 27.465060] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.469725] RSP: 0018:ffff8801be977488 EFLAGS: 00010293 [ 27.475079] RAX: ffff8801ad158340 RBX: ffff8801ad0e77c0 RCX: ffffffff87404cbe [ 27.482331] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 27.489586] RBP: ffff8801be977570 R08: ffff8801ad158340 R09: ffffed0035a1cf08 [ 27.496838] R10: ffffed0035a1cf08 R11: ffff8801ad0e7843 R12: 1ffff10037d2ee95 [ 27.504111] R13: ffff8801be977548 R14: ffffffff8970cc20 R15: ffff8801ad0e7840 [ 27.511376] ? smc_unhash_sk+0x28e/0x4a0 [ 27.515421] ? smc_unhash_sk+0x345/0x4a0 [ 27.519491] ? smc_unhash_sk+0x345/0x4a0 [ 27.523542] ? smc_rx_data_available+0x100/0x100 [ 27.528309] ? release_sock+0x1e2/0x2b0 [ 27.532273] ? __local_bh_enable_ip+0x161/0x230 [ 27.536925] ? __release_sock+0x3a0/0x3a0 [ 27.541065] ? smc_release+0x269/0x610 [ 27.544952] ? trace_hardirqs_on+0xd/0x10 [ 27.549098] ? __local_bh_enable_ip+0x161/0x230 [ 27.553759] smc_release+0x36e/0x610 [ 27.557457] sock_release+0x96/0x1b0 [ 27.561153] ? sock_alloc_file+0x4e0/0x4e0 [ 27.565366] sock_close+0x16/0x20 [ 27.568811] __fput+0x34d/0x890 [ 27.572081] ? fput+0x1a0/0x1a0 [ 27.575354] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.579836] ____fput+0x15/0x20 [ 27.583100] task_work_run+0x1e4/0x290 [ 27.586970] ? task_work_cancel+0x240/0x240 [ 27.591278] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.596795] ? switch_task_namespaces+0xa2/0xd0 [ 27.601449] do_exit+0x1aee/0x2730 [ 27.604971] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.609367] ? mm_update_next_owner+0x980/0x980 [ 27.614033] ? ___sys_sendmsg+0x31a/0x940 [ 27.618163] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.623169] ? kfree+0x1e9/0x260 [ 27.626517] ? ___sys_sendmsg+0x31f/0x940 [ 27.630646] ? copy_msghdr_from_user+0x560/0x560 [ 27.635380] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.640385] ? graph_lock+0x170/0x170 [ 27.644191] ? pud_val+0x80/0xf0 [ 27.647545] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.653063] ? __fget_light+0x2ef/0x430 [ 27.657035] ? __handle_mm_fault+0x93a/0x4310 [ 27.661514] ? fget_raw+0x20/0x20 [ 27.664960] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 27.669704] ? graph_lock+0x170/0x170 [ 27.673499] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.679025] ? sockfd_lookup_light+0xc5/0x160 [ 27.683516] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.689039] ? __sys_sendmmsg+0x4b3/0x6f0 [ 27.693173] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 27.697478] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.702998] ? __handle_mm_fault+0x4310/0x4310 [ 27.707574] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.713095] ? __do_page_fault+0x441/0xe40 [ 27.717327] do_group_exit+0x16f/0x430 [ 27.721195] ? mm_fault_error+0x380/0x380 [ 27.725323] ? __ia32_sys_exit+0x50/0x50 [ 27.729368] ? do_syscall_64+0x92/0x800 [ 27.733325] __x64_sys_exit_group+0x3e/0x50 [ 27.737643] do_syscall_64+0x1b1/0x800 [ 27.741512] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.746337] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.751247] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.756159] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.761506] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.766332] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.771515] RIP: 0033:0x43eb98 [ 27.774683] RSP: 002b:00007ffcc1325cd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.782386] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eb98 [ 27.789638] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.796893] RBP: 00000000004be540 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.804152] R10: 0000000024000000 R11: 0000000000000246 R12: 0000000000000001 [ 27.811402] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 27.819366] Dumping ftrace buffer: [ 27.822985] (ftrace buffer empty) [ 27.826675] Kernel Offset: disabled [ 27.830289] Rebooting in 86400 seconds..