[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.370710] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.541696] random: sshd: uninitialized urandom read (32 bytes read) [ 26.910930] random: sshd: uninitialized urandom read (32 bytes read) [ 27.624124] random: sshd: uninitialized urandom read (32 bytes read) [ 27.782924] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. [ 33.363435] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.475450] WARNING: CPU: 1 PID: 4492 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.483843] Kernel panic - not syncing: panic_on_warn set ... [ 33.483843] [ 33.491199] CPU: 1 PID: 4492 Comm: syz-executor120 Not tainted 4.17.0-rc3+ #35 [ 33.498540] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.507881] Call Trace: [ 33.510463] dump_stack+0x1b9/0x294 [ 33.514080] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.519261] ? smc_unhash_sk+0x310/0x4a0 [ 33.523312] panic+0x22f/0x4de [ 33.526487] ? add_taint.cold.5+0x16/0x16 [ 33.530616] ? __warn.cold.8+0x148/0x1b3 [ 33.534659] ? __warn.cold.8+0x117/0x1b3 [ 33.538706] ? smc_unhash_sk+0x345/0x4a0 [ 33.542749] __warn.cold.8+0x163/0x1b3 [ 33.546624] ? smc_unhash_sk+0x345/0x4a0 [ 33.550665] report_bug+0x252/0x2d0 [ 33.554274] do_error_trap+0x1de/0x490 [ 33.558142] ? graph_lock+0x170/0x170 [ 33.561924] ? math_error+0x420/0x420 [ 33.565714] ? lock_acquire+0x1dc/0x520 [ 33.569675] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.574507] do_invalid_op+0x1b/0x20 [ 33.578212] invalid_op+0x14/0x20 [ 33.581659] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.586303] RSP: 0018:ffff8801afe4f488 EFLAGS: 00010293 [ 33.591650] RAX: ffff8801af160240 RBX: ffff8801ad0647c0 RCX: ffffffff87402b7e [ 33.598905] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 33.606159] RBP: ffff8801afe4f570 R08: ffff8801af160240 R09: ffffed0035a0c908 [ 33.613411] R10: ffffed0035a0c908 R11: ffff8801ad064843 R12: 1ffff10035fc9e95 [ 33.620671] R13: ffff8801afe4f548 R14: ffffffff8970e8a0 R15: ffff8801ad064840 [ 33.627945] ? smc_unhash_sk+0x28e/0x4a0 [ 33.631997] ? smc_unhash_sk+0x345/0x4a0 [ 33.636062] ? smc_unhash_sk+0x345/0x4a0 [ 33.640106] ? smc_rx_data_available+0x100/0x100 [ 33.644844] ? release_sock+0x1e2/0x2b0 [ 33.648802] ? __local_bh_enable_ip+0x161/0x230 [ 33.653454] ? __release_sock+0x3a0/0x3a0 [ 33.657584] ? smc_release+0x269/0x610 [ 33.661454] ? trace_hardirqs_on+0xd/0x10 [ 33.665585] ? __local_bh_enable_ip+0x161/0x230 [ 33.670240] smc_release+0x36e/0x610 [ 33.673943] sock_release+0x96/0x1b0 [ 33.677641] ? sock_alloc_file+0x4e0/0x4e0 [ 33.681856] sock_close+0x16/0x20 [ 33.685303] __fput+0x34d/0x890 [ 33.688566] ? fput+0x1a0/0x1a0 [ 33.691838] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.696315] ____fput+0x15/0x20 [ 33.699576] task_work_run+0x1e4/0x290 [ 33.703451] ? task_work_cancel+0x240/0x240 [ 33.707757] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.713278] ? switch_task_namespaces+0xa2/0xd0 [ 33.717932] do_exit+0x1aee/0x2730 [ 33.721459] ? mm_update_next_owner+0x980/0x980 [ 33.726113] ? kasan_check_read+0x11/0x20 [ 33.730246] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.734644] ? __local_bh_enable_ip+0x161/0x230 [ 33.739300] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.744306] ? release_sock+0x1e2/0x2b0 [ 33.748277] ? trace_hardirqs_on+0xd/0x10 [ 33.752409] ? __local_bh_enable_ip+0x161/0x230 [ 33.757062] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.761464] ? kasan_check_read+0x11/0x20 [ 33.765595] ? rcu_is_watching+0x85/0x140 [ 33.769754] ? rcu_pm_notify+0xc0/0xc0 [ 33.773633] ? ___sys_sendmsg+0x31a/0x940 [ 33.777767] ? kfree+0x1e9/0x260 [ 33.781115] ? ___sys_sendmsg+0x31f/0x940 [ 33.785248] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.790780] ? __handle_mm_fault+0x93a/0x4310 [ 33.795276] ? copy_msghdr_from_user+0x560/0x560 [ 33.800026] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 33.804767] ? graph_lock+0x170/0x170 [ 33.808552] ? find_held_lock+0x36/0x1c0 [ 33.812605] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.818125] ? __fget_light+0x2ef/0x430 [ 33.822084] ? fget_raw+0x20/0x20 [ 33.825526] ? find_held_lock+0x36/0x1c0 [ 33.829582] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.835105] ? sockfd_lookup_light+0xc5/0x160 [ 33.839594] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.845116] ? __sys_sendmsg+0x1aa/0x270 [ 33.849163] ? __ia32_sys_shutdown+0x80/0x80 [ 33.853554] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.859073] ? __do_page_fault+0x441/0xe40 [ 33.863305] do_group_exit+0x16f/0x430 [ 33.867186] ? __ia32_sys_exit+0x50/0x50 [ 33.871240] ? do_syscall_64+0x92/0x800 [ 33.875197] __x64_sys_exit_group+0x3e/0x50 [ 33.879503] do_syscall_64+0x1b1/0x800 [ 33.883373] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.888292] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.893208] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.898565] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.903400] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.908579] RIP: 0033:0x43e948 [ 33.911754] RSP: 002b:00007ffeecb76998 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.919461] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e948 [ 33.926718] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.933971] RBP: 00000000004be2e0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.941223] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 33.948484] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.956377] Dumping ftrace buffer: [ 33.959989] (ftrace buffer empty) [ 33.963681] Kernel Offset: disabled [ 33.967294] Rebooting in 86400 seconds..