[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.830305] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.379461] random: sshd: uninitialized urandom read (32 bytes read) [ 25.737310] random: sshd: uninitialized urandom read (32 bytes read) [ 26.478548] random: sshd: uninitialized urandom read (32 bytes read) [ 26.634545] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 32.219143] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.306761] WARNING: CPU: 0 PID: 4566 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.315158] Kernel panic - not syncing: panic_on_warn set ... [ 32.315158] [ 32.322505] CPU: 0 PID: 4566 Comm: syz-executor062 Not tainted 4.17.0-rc4+ #46 [ 32.329854] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.339197] Call Trace: [ 32.341773] dump_stack+0x1b9/0x294 [ 32.345383] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.350558] ? smc_unhash_sk+0x330/0x4a0 [ 32.354602] panic+0x22f/0x4de [ 32.357776] ? add_taint.cold.5+0x16/0x16 [ 32.361907] ? __warn.cold.8+0x148/0x1b3 [ 32.365950] ? __warn.cold.8+0x117/0x1b3 [ 32.369991] ? smc_unhash_sk+0x345/0x4a0 [ 32.374033] __warn.cold.8+0x163/0x1b3 [ 32.377899] ? smc_unhash_sk+0x345/0x4a0 [ 32.381941] report_bug+0x252/0x2d0 [ 32.385549] do_error_trap+0x1de/0x490 [ 32.389428] ? graph_lock+0x170/0x170 [ 32.393211] ? math_error+0x420/0x420 [ 32.396995] ? lock_acquire+0x1dc/0x520 [ 32.400953] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.405787] do_invalid_op+0x1b/0x20 [ 32.409480] invalid_op+0x14/0x20 [ 32.412913] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.417566] RSP: 0018:ffff8801c6ed7488 EFLAGS: 00010293 [ 32.422909] RAX: ffff8801abfd02c0 RBX: ffff8801abf157c0 RCX: ffffffff8740565e [ 32.430159] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 32.437409] RBP: ffff8801c6ed7570 R08: ffff8801abfd02c0 R09: ffffed00357e2b08 [ 32.444667] R10: ffffed00357e2b08 R11: ffff8801abf15843 R12: 1ffff10038ddae95 [ 32.451917] R13: ffff8801c6ed7548 R14: ffffffff8970cba0 R15: ffff8801abf15840 [ 32.459176] ? smc_unhash_sk+0x28e/0x4a0 [ 32.463225] ? smc_unhash_sk+0x345/0x4a0 [ 32.467275] ? smc_unhash_sk+0x345/0x4a0 [ 32.471319] ? smc_rx_data_available+0x100/0x100 [ 32.476074] ? release_sock+0x1e2/0x2b0 [ 32.480049] ? __local_bh_enable_ip+0x161/0x230 [ 32.484698] ? __release_sock+0x3a0/0x3a0 [ 32.488835] ? smc_release+0x269/0x610 [ 32.492702] ? trace_hardirqs_on+0xd/0x10 [ 32.497102] ? __local_bh_enable_ip+0x161/0x230 [ 32.501761] smc_release+0x36e/0x610 [ 32.505457] sock_release+0x96/0x1b0 [ 32.509162] ? sock_alloc_file+0x4e0/0x4e0 [ 32.513374] sock_close+0x16/0x20 [ 32.516808] __fput+0x34d/0x890 [ 32.520072] ? fput+0x1a0/0x1a0 [ 32.523331] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.527805] ____fput+0x15/0x20 [ 32.531064] task_work_run+0x1e4/0x290 [ 32.534935] ? task_work_cancel+0x240/0x240 [ 32.539250] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.544767] ? switch_task_namespaces+0xa2/0xd0 [ 32.549418] do_exit+0x1aee/0x2730 [ 32.552936] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.557325] ? mm_update_next_owner+0x980/0x980 [ 32.561972] ? trace_hardirqs_off+0xd/0x10 [ 32.566552] ? quarantine_put+0xeb/0x190 [ 32.570595] ? kfree+0x111/0x260 [ 32.573955] ? ___sys_sendmsg+0x31a/0x940 [ 32.578085] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.583081] ? trace_hardirqs_on+0xd/0x10 [ 32.587209] ? ___sys_sendmsg+0x31f/0x940 [ 32.591345] ? copy_msghdr_from_user+0x560/0x560 [ 32.596077] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.601071] ? graph_lock+0x170/0x170 [ 32.604850] ? lock_downgrade+0x8e0/0x8e0 [ 32.608978] ? pud_val+0x80/0xf0 [ 32.612335] ? pmd_val+0xf0/0xf0 [ 32.615692] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.621210] ? __fget_light+0x2ef/0x430 [ 32.625161] ? __handle_mm_fault+0x93a/0x4310 [ 32.629638] ? fget_raw+0x20/0x20 [ 32.633257] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.637989] ? graph_lock+0x170/0x170 [ 32.641952] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.647470] ? sockfd_lookup_light+0xc5/0x160 [ 32.651958] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.657476] ? __sys_sendmmsg+0x4b3/0x6f0 [ 32.661612] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 32.665917] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.671445] ? __handle_mm_fault+0x4310/0x4310 [ 32.676013] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.681527] ? __do_page_fault+0x441/0xe40 [ 32.685746] do_group_exit+0x16f/0x430 [ 32.689628] ? mm_fault_error+0x380/0x380 [ 32.693775] ? __ia32_sys_exit+0x50/0x50 [ 32.697824] ? do_syscall_64+0x92/0x800 [ 32.701784] __x64_sys_exit_group+0x3e/0x50 [ 32.706094] do_syscall_64+0x1b1/0x800 [ 32.709960] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.714788] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.719698] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.724631] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.729984] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.734828] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.739997] RIP: 0033:0x43f0a8 [ 32.743165] RSP: 002b:00007ffd80590ac8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.750854] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f0a8 [ 32.758105] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.765380] RBP: 00000000004bea80 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.772626] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.779886] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.787647] Dumping ftrace buffer: [ 32.791251] (ftrace buffer empty) [ 32.794940] Kernel Offset: disabled [ 32.798547] Rebooting in 86400 seconds..