[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.461356] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c[ 20.584615] random: sshd: uninitialized urandom read (32 bytes read) . [ 20.912536] random: sshd: uninitialized urandom read (32 bytes read) [ 21.681492] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 43.962177] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 49.439489] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 49.535036] WARNING: CPU: 0 PID: 4544 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 49.543457] Kernel panic - not syncing: panic_on_warn set ... [ 49.543457] [ 49.550819] CPU: 0 PID: 4544 Comm: syz-executor128 Not tainted 4.17.0-rc4+ #54 [ 49.558165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.567501] Call Trace: [ 49.570086] dump_stack+0x1b9/0x294 [ 49.573817] ? dump_stack_print_info.cold.2+0x52/0x52 [ 49.579016] ? smc_unhash_sk+0x260/0x4a0 [ 49.583064] panic+0x22f/0x4de [ 49.586240] ? add_taint.cold.5+0x16/0x16 [ 49.590372] ? __warn.cold.8+0x148/0x1b3 [ 49.594417] ? __warn.cold.8+0x117/0x1b3 [ 49.598465] ? smc_unhash_sk+0x345/0x4a0 [ 49.602517] __warn.cold.8+0x163/0x1b3 [ 49.606387] ? smc_unhash_sk+0x345/0x4a0 [ 49.610430] report_bug+0x252/0x2d0 [ 49.614047] do_error_trap+0x1de/0x490 [ 49.617920] ? graph_lock+0x170/0x170 [ 49.621706] ? math_error+0x420/0x420 [ 49.625496] ? lock_acquire+0x1dc/0x520 [ 49.629455] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.634281] do_invalid_op+0x1b/0x20 [ 49.637980] invalid_op+0x14/0x20 [ 49.641419] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 49.646072] RSP: 0018:ffff8801ad70f488 EFLAGS: 00010293 [ 49.651420] RAX: ffff8801ad682680 RBX: ffff8801d907e7c0 RCX: ffffffff8740fb2e [ 49.658675] RDX: 0000000000000000 RSI: ffffffff8740fbe5 RDI: 0000000000000005 [ 49.665941] RBP: ffff8801ad70f570 R08: ffff8801ad682680 R09: ffffed003b20fd08 [ 49.673194] R10: ffffed003b20fd08 R11: ffff8801d907e843 R12: 1ffff10035ae1e95 [ 49.680450] R13: ffff8801ad70f548 R14: ffffffff8970dc60 R15: ffff8801d907e840 [ 49.687727] ? smc_unhash_sk+0x28e/0x4a0 [ 49.691778] ? smc_unhash_sk+0x345/0x4a0 [ 49.695821] ? smc_unhash_sk+0x345/0x4a0 [ 49.699870] ? smc_rx_data_available+0x100/0x100 [ 49.704624] ? release_sock+0x1e2/0x2b0 [ 49.708586] ? __local_bh_enable_ip+0x161/0x230 [ 49.713240] ? __release_sock+0x3a0/0x3a0 [ 49.717373] ? smc_release+0x269/0x610 [ 49.721245] ? trace_hardirqs_on+0xd/0x10 [ 49.725376] ? __local_bh_enable_ip+0x161/0x230 [ 49.730030] smc_release+0x36e/0x610 [ 49.733736] sock_release+0x96/0x1b0 [ 49.737436] ? sock_alloc_file+0x4e0/0x4e0 [ 49.741659] sock_close+0x16/0x20 [ 49.745100] __fput+0x34d/0x890 [ 49.748368] ? fput+0x1a0/0x1a0 [ 49.751635] ? _raw_spin_unlock_irq+0x27/0x70 [ 49.756114] ____fput+0x15/0x20 [ 49.759390] task_work_run+0x1e4/0x290 [ 49.763260] ? task_work_cancel+0x240/0x240 [ 49.767573] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 49.773100] ? switch_task_namespaces+0xa2/0xd0 [ 49.777784] do_exit+0x1aee/0x2730 [ 49.781319] ? mm_update_next_owner+0x980/0x980 [ 49.785993] ? kasan_check_read+0x11/0x20 [ 49.790131] ? do_raw_spin_unlock+0x9e/0x2e0 [ 49.794524] ? __local_bh_enable_ip+0x161/0x230 [ 49.799180] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.804192] ? release_sock+0x1e2/0x2b0 [ 49.808170] ? trace_hardirqs_on+0xd/0x10 [ 49.812316] ? __local_bh_enable_ip+0x161/0x230 [ 49.816979] ? _raw_spin_unlock_bh+0x30/0x40 [ 49.821391] ? kasan_check_read+0x11/0x20 [ 49.825540] ? rcu_is_watching+0x85/0x140 [ 49.829670] ? rcu_pm_notify+0xc0/0xc0 [ 49.833542] ? ___sys_sendmsg+0x31a/0x940 [ 49.837672] ? kfree+0x1e9/0x260 [ 49.841022] ? ___sys_sendmsg+0x31f/0x940 [ 49.845162] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.850689] ? __handle_mm_fault+0x93a/0x4310 [ 49.855180] ? copy_msghdr_from_user+0x560/0x560 [ 49.859948] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 49.864701] ? graph_lock+0x170/0x170 [ 49.868492] ? find_held_lock+0x36/0x1c0 [ 49.872547] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.878092] ? __fget_light+0x2ef/0x430 [ 49.882061] ? fget_raw+0x20/0x20 [ 49.885507] ? find_held_lock+0x36/0x1c0 [ 49.889565] ? lock_downgrade+0x8e0/0x8e0 [ 49.893705] ? handle_mm_fault+0x8c0/0xc70 [ 49.897952] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.903478] ? sockfd_lookup_light+0xc5/0x160 [ 49.907963] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.913498] ? __sys_sendmsg+0x1aa/0x270 [ 49.917560] ? __ia32_sys_shutdown+0x80/0x80 [ 49.921971] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.927497] ? __do_page_fault+0x441/0xe40 [ 49.931725] do_group_exit+0x16f/0x430 [ 49.935603] ? __ia32_sys_exit+0x50/0x50 [ 49.939654] ? do_syscall_64+0x92/0x800 [ 49.943615] __x64_sys_exit_group+0x3e/0x50 [ 49.947934] do_syscall_64+0x1b1/0x800 [ 49.951818] ? syscall_return_slowpath+0x5c0/0x5c0 [ 49.956733] ? syscall_return_slowpath+0x30f/0x5c0 [ 49.961653] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 49.967009] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.971848] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.977029] RIP: 0033:0x440058 [ 49.980204] RSP: 002b:00007fff6ef2b868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 49.987984] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440058 [ 49.995237] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 50.002494] RBP: 00000000004bfc40 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 50.009771] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 50.017033] R13: 00000000006cd160 R14: 0000000000000000 R15: 0000000000000000 [ 50.024890] Dumping ftrace buffer: [ 50.028550] (ftrace buffer empty) [ 50.032255] Kernel Offset: disabled [ 50.035874] Rebooting in 86400 seconds..