[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.944415] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.191988] random: sshd: uninitialized urandom read (32 bytes read) [ 24.458963] random: sshd: uninitialized urandom read (32 bytes read) [ 25.180810] random: sshd: uninitialized urandom read (32 bytes read) [ 25.346151] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts. [ 30.826701] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.921919] WARNING: CPU: 0 PID: 4437 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.930327] Kernel panic - not syncing: panic_on_warn set ... [ 30.930327] [ 30.937681] CPU: 0 PID: 4437 Comm: syz-executor025 Not tainted 4.17.0-rc2+ #32 [ 30.945019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.954354] Call Trace: [ 30.956929] dump_stack+0x1b9/0x294 [ 30.960542] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.965722] ? smc_unhash_sk+0x2f0/0x4a0 [ 30.969765] panic+0x22f/0x4de [ 30.972938] ? add_taint.cold.5+0x16/0x16 [ 30.977074] ? __warn.cold.8+0x148/0x1b3 [ 30.981113] ? __warn.cold.8+0x117/0x1b3 [ 30.985153] ? smc_unhash_sk+0x345/0x4a0 [ 30.989193] __warn.cold.8+0x163/0x1b3 [ 30.993063] ? smc_unhash_sk+0x345/0x4a0 [ 30.997106] report_bug+0x252/0x2d0 [ 31.000719] do_error_trap+0x1de/0x490 [ 31.004602] ? graph_lock+0x170/0x170 [ 31.008384] ? math_error+0x420/0x420 [ 31.012168] ? lock_acquire+0x1dc/0x520 [ 31.016124] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.020956] do_invalid_op+0x1b/0x20 [ 31.024651] invalid_op+0x14/0x20 [ 31.028095] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.032753] RSP: 0018:ffff8801bda9f488 EFLAGS: 00010293 [ 31.038097] RAX: ffff8801bf428680 RBX: ffff8801bdb267c0 RCX: ffffffff873fce9e [ 31.045351] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005 [ 31.052605] RBP: ffff8801bda9f570 R08: ffff8801bf428680 R09: ffffed0037b64d08 [ 31.059854] R10: ffffed0037b64d08 R11: ffff8801bdb26843 R12: 1ffff10037b53e95 [ 31.067100] R13: ffff8801bda9f548 R14: ffffffff8970e060 R15: ffff8801bdb26840 [ 31.074362] ? smc_unhash_sk+0x28e/0x4a0 [ 31.078400] ? smc_unhash_sk+0x345/0x4a0 [ 31.082440] ? smc_unhash_sk+0x345/0x4a0 [ 31.086480] ? smc_hash_sk+0x2f0/0x2f0 [ 31.090354] ? release_sock+0x1e2/0x2b0 [ 31.094313] ? __local_bh_enable_ip+0x161/0x230 [ 31.098962] ? __release_sock+0x3a0/0x3a0 [ 31.103089] ? smc_release+0x269/0x610 [ 31.107130] ? trace_hardirqs_on+0xd/0x10 [ 31.111265] ? __local_bh_enable_ip+0x161/0x230 [ 31.115912] smc_release+0x36e/0x610 [ 31.119610] sock_release+0x96/0x1b0 [ 31.123301] ? sock_alloc_file+0x4e0/0x4e0 [ 31.127514] sock_close+0x16/0x20 [ 31.130948] __fput+0x34d/0x890 [ 31.134211] ? fput+0x1a0/0x1a0 [ 31.137472] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.141959] ____fput+0x15/0x20 [ 31.145225] task_work_run+0x1e4/0x290 [ 31.149090] ? task_work_cancel+0x240/0x240 [ 31.153393] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.158923] ? switch_task_namespaces+0xa2/0xd0 [ 31.163586] do_exit+0x1aee/0x2730 [ 31.167120] ? mm_update_next_owner+0x980/0x980 [ 31.171775] ? kasan_check_write+0x14/0x20 [ 31.175991] ? do_raw_spin_lock+0xc1/0x200 [ 31.180209] ? trace_hardirqs_off+0xd/0x10 [ 31.184426] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.189518] ? debug_check_no_obj_freed+0x2ff/0x584 [ 31.194514] ? __local_bh_enable_ip+0x161/0x230 [ 31.199169] ? kasan_check_read+0x11/0x20 [ 31.203298] ? rcu_is_watching+0x85/0x140 [ 31.207426] ? rcu_pm_notify+0xc0/0xc0 [ 31.211298] ? ___sys_sendmsg+0x31a/0x940 [ 31.215427] ? kfree+0x1e9/0x260 [ 31.218772] ? ___sys_sendmsg+0x31f/0x940 [ 31.222901] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.228422] ? copy_msghdr_from_user+0x560/0x560 [ 31.233160] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.237895] ? graph_lock+0x170/0x170 [ 31.241686] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.247205] ? __fget_light+0x2ef/0x430 [ 31.251156] ? fget_raw+0x20/0x20 [ 31.254594] ? find_held_lock+0x36/0x1c0 [ 31.258657] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.264175] ? sockfd_lookup_light+0xc5/0x160 [ 31.268653] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.274172] ? __sys_sendmsg+0x1aa/0x270 [ 31.278215] ? __ia32_sys_shutdown+0x80/0x80 [ 31.282607] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.288123] ? __do_page_fault+0x441/0xe40 [ 31.292354] do_group_exit+0x16f/0x430 [ 31.296223] ? __ia32_sys_exit+0x50/0x50 [ 31.300269] ? do_syscall_64+0x92/0x800 [ 31.304234] __x64_sys_exit_group+0x3e/0x50 [ 31.308544] do_syscall_64+0x1b1/0x800 [ 31.312428] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.317252] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.322162] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.327078] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.332423] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.337250] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.342418] RIP: 0033:0x43ea28 [ 31.345585] RSP: 002b:00007ffefb1fced8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.353271] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea28 [ 31.360522] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.367773] RBP: 00000000004be3c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.375028] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.382452] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.390394] Dumping ftrace buffer: [ 31.394060] (ftrace buffer empty) [ 31.397749] Kernel Offset: disabled [ 31.401359] Rebooting in 86400 seconds..